roll body

Abstract

The present invention provides a roll that can effectively mitigate the step difference caused by the starting end of the winding of a sheet and can suppress contamination. According to one aspect of the invention, a roll (10) is provided, which includes a core (11) and an elongated sheet (12) wound around the outer peripheral surface (11A) of the core (11), wherein the roll includes: a first gap (13) located between the core (11) and the first circumference of the sheet (12) and in contact with the end face (12A) of the starting end (12A) of the first circumference of the sheet (12) in the length direction (DR2); a first filling portion (14) filling the first gap (13) and extending along the width direction (DR1) of the core (11); and a first exposure suppression member (18) suppressing the exposure of the end (14A) of the first filling portion (14) in the width direction (DR1) on the outside of the sheet (12).

Description

[0001] Reference to relevant applications

[0002] This application enjoys the priority of Japanese Patent Application 2020-131040 (filed on July 31, 2020), the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This invention relates to a roll. Background Technology

[0004] For sheet materials such as films, from a manufacturing efficiency standpoint, they are mostly manufactured in concentrated quantities and wound onto a core for storage as rolls. Within such rolls, a step difference arises due to the beginning of the winding process. Specifically, this step difference occurs when the sheet transitions from the first to the second winding, and it persists even after the second winding. Furthermore, depending on the type of sheet, when this step difference occurs, there is a possibility that the sheet may deform and become irreversible.

[0005] Currently, the following technologies have been proposed: mitigating the aforementioned step difference by attaching or embedding a highly cushioning strip, such as polyurethane resin, to the outer peripheral surface of the core and embedding the sheet into the cushioning strip (for example, see Patent Document 1); mitigating the step difference by using a core with rubber on its outer peripheral surface and embedding the sheet into the rubber; or, providing an elastic cushioning element on the outer peripheral surface of the core along the end of the beginning of the sheet winding (for example, see Patent Document 2).

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2005-75521

[0009] Patent Document 2: Japanese Patent Application Publication No. 2013-199355 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] However, the current situation is that none of the aforementioned techniques can effectively mitigate the step difference.

[0012] In addition, when winding the sheet into the core, firstly, fixation components such as double-sided tape are attached to the outer periphery of the core to fix a portion of the sheet (e.g., the beginning end of winding), but there is also a situation where step difference is generated due to these fixation components.

[0013] Currently, to effectively mitigate these step differences, the following solutions have been studied: filling the gaps formed when the sheet transitions from the first to the second week, or the gaps formed between the fixing components and the sheet from the first week, with filler. However, if filler is filled into these gaps, the pressure during sheet winding may cause the filler to overflow. If the overflowed portion is exposed, it may sometimes adhere to the roll, thus becoming a cause of contamination.

[0014] This invention was made to solve the aforementioned problems. Specifically, the object of this invention is to provide a roll that can effectively mitigate step differences caused by the starting end of the sheet winding and suppress contamination. Furthermore, the object of this invention is to provide a roll that can effectively mitigate step differences caused by fixing components and suppress contamination.

[0015] Methods for solving problems

[0016] This invention includes the following inventions.

[0017] [1] A roll having a core and an elongated sheet wound around the outer periphery of the core, wherein the roll has: a first gap located between the core and the first circumference of the sheet and in contact with the end face of the winding start end of the first circumference of the sheet in the length direction; a first filling portion filled in the first gap and extending in the width direction of the core; and a first exposure suppressing member that suppresses the end of the first filling portion in the width direction from being exposed on the outside of the sheet.

[0018] [2] According to the roll body described in [1] above, the first exposure suppression member is located outside the end of the first filling portion in the width direction and is covered by the sheet.

[0019] [3] According to the roll body described in [1] or [2] above, the sheet has: an effective area; and an ineffective area located outside the effective area in the width direction, wherein the first exposure suppression member is located in the ineffective area of ​​the sheet.

[0020] [4] According to the roll body described in [2] or [3] above, wherein the first exposure suppression member extends circumferentially along the core.

[0021] [5] The roll body according to any one of [2] to [4] above, wherein the length of the first exposure suppression member in the circumferential direction of the core is greater than the maximum length of the first filling portion in the circumferential direction.

[0022] [6] According to the roll body described in [1] above, wherein the end of the first filling portion overflows to the outside of the sheet, and the first exposure suppression member is sheet-shaped and covers the overflowing end of the first filling portion.

[0023] [7] The roll body according to any one of [1] to [6] above, wherein the first filling portion comprises a coloring material or a luminescent material.

[0024] [8] The roll body according to any one of [1] to [6] above, wherein the first filling portion comprises a cured product of a curable polymer composition.

[0025] [9] The roll body according to any one of [1] to [8] above, wherein the first exposure suppression member is made of resin or the first exposure suppression member is a strip.

[0026]

[10] A roll having a core and an elongated sheet wound around the outer periphery of the core, wherein the roll comprises: a fixing member disposed between the core and the sheet of the first circumference, having a first end face extending in the width direction of the core and a second end face opposite to the first end face, and fixing a portion of the sheet relative to the core; a second gap located between the core and the sheet of the first circumference, and in contact with the first end face of the fixing member; a second filling portion filled in the second gap and extending in the width direction of the core; and a second exposure suppressing member suppressing the exposure of the end of the second filling portion in the width direction on the outside of the sheet.

[0027]

[11] According to the roll body described in

[10] above, the second exposure suppression member is located outside the end of the second filling portion in the width direction and is covered by the sheet.

[0028]

[12] According to the roll body described in

[11] above, the sheet has: an effective area; and an ineffective area located outside the effective area in the width direction, wherein the second exposure suppression member is located in the ineffective area of ​​the sheet.

[0029]

[13] According to the roll body described in

[11] or

[12] above, wherein the second exposure suppression member extends circumferentially along the core.

[0030]

[14] The roll body according to any one of

[11] to

[13] above, wherein the length of the second exposure suppressing member in the circumferential direction of the core is greater than the maximum length of the second filling portion in the circumferential direction.

[0031]

[15] According to the roll body described in

[10] above, wherein the end of the second filling portion overflows to the outside of the sheet, and the second exposure suppression member is sheet-shaped and covers the overflowing end of the second filling portion.

[0032]

[16] The roll body according to any one of

[10] to

[15] above, wherein the second filling portion comprises a coloring material or a luminescent material.

[0033]

[17] The roll body according to any one of

[10] to

[16] above, wherein the second filling portion comprises a cured product of a curable polymer composition.

[0034]

[18] A roll having a core and an elongated sheet wound around the outer periphery of the core, wherein the roll comprises: a fixing member disposed between the core and the sheet of the first circumference, having a first end face extending in the width direction of the core and a second end face located on the side opposite to the first end face and closer to the length direction of the sheet of the first circumference than the first end face, and fixing a portion of the sheet relative to the core; a second gap disposed between the core and the sheet of the first circumference, and abutting the first end face of the fixing member; a clamping portion disposed between the sheets of the first circumference and at least in a region corresponding to the second gap, and extending in the width direction of the core; and a second exposure suppressing member that suppresses the end of the clamping portion in the width direction from being exposed on the outside of the sheet.

[0035]

[19] According to the roll body described above

[18] , the second exposure suppression member is located outside the end of the clamping portion in the width direction, and at least a portion of the second exposure suppression member is covered by the sheet.

[0036]

[20] According to the roll body described in

[18] or

[19] above, wherein the second exposure suppression member extends circumferentially along the core.

[0037]

[21] The roll body according to any one of

[18] to

[20] above, wherein the length of the second exposure suppressing member in the circumferential direction of the roll core is greater than the maximum length of the clamping portion in the circumferential direction.

[0038]

[22] The roll body according to any one of

[18] to

[21] above, wherein the clamping portion comprises a coloring material or a luminescent material.

[0039]

[23] The roll body according to any one of

[18] to

[21] above, wherein the clamping part comprises a cured product of a curable polymer composition.

[0040]

[24] The roll according to any one of [1] to

[23] above, wherein the sheet is a resin film, paper or glass film.

[0041]

[25] The roll according to any one of [1] to

[23] above, wherein the sheet comprises an acrylic resin, a polyester resin or a cycloolefin polymer resin.

[0042]

[26] The roll according to any one of [1] to

[25] above, wherein the thickness of the sheet is 15 μm or more and 300 μm or less.

[0043] The effects of the invention

[0044] According to one aspect of the invention, a roll can be provided that effectively mitigates step differences caused by the starting end of the sheet winding and suppresses contamination. Furthermore, according to another aspect of the invention, a roll can be provided that effectively mitigates step differences caused by the fixing components and suppresses contamination. Attached Figure Description

[0045] Figure 1 This is a perspective view of the scroll body according to the first embodiment.

[0046] Figure 2 yes Figure 1 A top view of the scroll.

[0047] Figure 3 It is Figure 2 An enlarged view of a portion of the cross-section of line II in the scroll.

[0048] Figure 4 It is used for explanation Figure 1 A diagram showing the dimensions of each component of the scroll.

[0049] Figure 5 It is shown Figure 1 The diagram shows the two regions surrounding the first filling section of the scroll.

[0050] Figure 6 It is Figure 2 An enlarged view of a portion of the cross-section of line II-II in the volume.

[0051] Figure 7 It is Figure 1 An enlarged top view of a portion of the scroll.

[0052] Figure 8 This is an enlarged view of a portion of another volume of the first embodiment.

[0053] Figure 9This is an enlarged view of a portion of another volume of the first embodiment.

[0054] Figure 10 It is a top view of the sample used to determine the location of the in-plane phase difference.

[0055] Figure 11 This is a top view of the roll used to determine the measurement position of the laser displacement gauge.

[0056] Figure 12 This is a schematic diagram of the displacement relative to a position, based on measurements taken by a laser displacement gauge.

[0057] Figure 13 This is an enlarged view of a portion of another volume of the first embodiment.

[0058] Figure 14 This is an enlarged view of a portion of another volume of the first embodiment.

[0059] Figure 15 This is an enlarged view of a portion of another volume of the first embodiment.

[0060] Figure 16 This is an enlarged view of a portion of another volume of the first embodiment.

[0061] Figure 17 This is an enlarged view of a portion of another volume of the first embodiment.

[0062] Figure 18 This is an enlarged view of a portion of another volume of the first embodiment.

[0063] Figure 19 This is an enlarged view of a portion of another volume of the first embodiment.

[0064] Figure 20 This is an enlarged view of a portion of another volume of the first embodiment.

[0065] Figure 21 This is an enlarged view of a portion of another volume of the first embodiment.

[0066] Figure 22 This is an enlarged view of a portion of another volume of the first embodiment.

[0067] Figure 23 This is a top view of another volume of the first embodiment.

[0068] Figure 24 yes Figure 23 A cross-sectional view of line III-III in the volume.

[0069] Figure 25 yes Figure 23 A cross-sectional view of line IV-IV in the volume.

[0070] Figure 26 This is a top view of another volume of the first embodiment.

[0071] Figure 27 It is Figure 26 An enlarged view of a portion of the cross-section of the VV line in the scroll.

[0072] Figure 28 It is a measurement Figure 27 The diagram shows the maximum thickness and length of the second clamping part.

[0073] Figure 29 It is Figure 26 An enlarged view of a portion of the cross-section of line VI-VI in the scroll.

[0074] Figure 30 (A) and Figure 30 (B) is a diagram schematically illustrating the manufacturing process of the roll body according to the first embodiment.

[0075] Figure 31 (A) and Figure 31 (B) is a diagram schematically illustrating the manufacturing process of the roll body according to the first embodiment.

[0076] Figure 32 (A) and Figure 32 (B) is a diagram schematically illustrating the manufacturing process of the roll body according to the first embodiment.

[0077] Figure 33 This is a diagram schematically illustrating the manufacturing process of the roll body according to the first embodiment.

[0078] Figure 34 This is a perspective view of the scroll body according to the second embodiment.

[0079] Figure 35 yes Figure 34 A top view of the scroll.

[0080] Figure 36 It is Figure 35 An enlarged view of a portion of the cross section of line VII-VII in the volume.

[0081] Figure 37 It is Figure 35 An enlarged view of a portion of the cross section of line VIII-VIII in the volume.

[0082] Figure 38 It is Figure 34 An enlarged top view of a portion of the scroll.

[0083] Figure 39 This is an enlarged view of a portion of another volume of the second embodiment.

[0084] Figure 40 This is a top view of another volume of the second embodiment.

[0085] Figure 41 It is Figure 40 An enlarged view of a portion of the cross section of the IX-IX line in the scroll.

[0086] Figure 42 It is Figure 40 An enlarged view of a portion of the cross-section of the XX line in the scroll.

[0087] Figure 43 It is Figure 40 An enlarged view of a portion of the cross section of the XI-XI line in the scroll.

[0088] Figure 44 (A) and Figure 44 (B) is a diagram schematically illustrating the manufacturing process of the roll body according to the second embodiment.

[0089] Figure 45 (A) and Figure 45 (B) is a diagram schematically illustrating the manufacturing process of the roll body according to the second embodiment. Detailed Implementation

[0090] [First Implementation Method]

[0091] Hereinafter, the first embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a perspective view of the scroll body according to the first embodiment. Figure 2 yes Figure 1 A top view of the scroll. Figure 3 It is Figure 2 An enlarged view of a portion of the cross-section of line II in the scroll. Figure 4 It is used for explanation Figure 1 A diagram showing the dimensions of each component of the scroll. Figure 5 It is shown Figure 1 The image shows two regions surrounding the first filling section in the volume. Figure 6 It is Figure 2 An enlarged view of a portion of the cross-section of line II-II in the volume. Figure 7 It is Figure 1 An enlarged top view of a portion of the scroll. Figure 8 and Figure 9 This is an enlarged view of a portion of another volume of this embodiment. Figure 10 It is a top view of the sample used to determine the location of the in-plane phase difference. Figure 11This is a top view of the roll used to determine the measurement position of a laser displacement gauge. Figure 12 This is a schematic diagram of the displacement relative to a position, based on measurements taken by a laser displacement gauge. Figures 13-22 This is an enlarged view of a portion of another volume of this embodiment. Figure 23 This is a top view of another volume of this embodiment. Figure 24 yes Figure 23 A cross-sectional view of line III-III in the volume. Figure 25 yes Figure 23 A cross-sectional view of line IV-IV in the volume. Figure 26 This is a top view of another volume of this embodiment. Figure 27 It is Figure 26 An enlarged view of a portion of the cross-section of the VV line in the scroll. Figure 28 It is a measurement Figure 27 The diagram shows the maximum thickness and length of the second clamping part. Figure 29 It is Figure 36 An enlarged view of a portion of the cross-section of line VI-VI in the scroll.

[0092] <<<Roll>>>

[0093] Figure 1 and Figure 2 The roll 10 shown includes a core 11 and a strip-shaped sheet 12 wound around the outer peripheral surface 11A of the core 11. For example... Figure 3 As shown, the roll body 10 includes: a first filling portion 14 that fills a first gap 13 located between the core 11 and the sheet 12; a second filling portion 16 that fills a second gap 15 located between the core 11 and the sheet 12; and a fixing member 17 for fixing a portion of the sheet 12 to the core 11. Additionally, as... Figure 2 and Figure 6 As shown, it also includes: a pair of first exposure suppression members 18, which suppress the end 14A of the first filling portion 14 in the width direction DR1 of the core 11 from being exposed to the outside of the sheet 12; and a pair of second exposure suppression members 19, which suppress the end 16A of the second filling portion 16 in the width direction DR1 of the core 11 from being exposed to the outside of the sheet 12.

[0094] The sheet 12 is wound multiple times on the core 11, for example, more than two times. The roll 10 may or may not have at least one of the first exposure suppressing member 18 and the second exposure suppressing member 19. Furthermore, although the roll 10 has a pair of first exposure suppressing members 18, it is sufficient to have at least one first exposure suppressing member 18 on one side. Similarly, although the roll 10 has a pair of second exposure suppressing members 19, it is sufficient to have at least one second exposure suppressing member 19 on one side.

[0095] In addition, such as Figure 3 As shown, the roll 10 also includes a first clamping portion 20, which is continuously disposed with the first filling portion 14 and located between the first sheet 12 and the second sheet 12. The roll 10 is as follows... Figure 3 It has a first clamping part 20 as shown, but it can also be as shown in the figure. Figure 8 The scroll 30 shown does not have a first clamping part.

[0096] <<Roll Core>>

[0097] The shape of the core 11 is not particularly limited, but from the viewpoint that it can be easily wound around the sheet 12, it is preferably cylindrical or cylindrical. Figure 1 The shown core 11 is cylindrical. When the core is cylindrical, the roll 10 can be held in place by inserting a locking member of the winding device into the hole 11B on the width direction DR1 of the core 11. The locking member is a component used to rotatably fix and hold the roll 10 relative to the winding device by inserting it into the hole 11B of the core 11. When the core is cylindrical, the core has a shaft member that passes through the core; by mounting the shaft member to the winding device, the roll can be held in the winding device.

[0098] The width W1 of core 11 (refer to) Figure 2 The width of the core 11 is not specifically limited; for example, it can be above 0.1m and below 50m. The lower limit of the width W1 can be above 0.2m, 0.3m, 0.7m, 1.0m, 1.5m, or 2m, and the upper limit can be below 30m, 20m, 10m, 7m, 5m, 3.5m, 3m, or 2.5m. The width of the core can be determined as follows: measure the width of the core at 10 locations, and calculate the arithmetic mean of the 8 widths remaining after removing the maximum and minimum values ​​from the 10 measured widths.

[0099] The outer diameter of the core 11 is not particularly limited; for example, it can be 30mm or more and 8000mm or less. The lower limit of the outer diameter of the core 11 can be 90mm or more or 100mm or more, while the upper limit can be less than 5000mm, 3500mm, 2000mm, 1000mm, 700mm, 500mm, 350mm, or 300mm. The outer diameter of the core can be determined by measuring the outer diameter of the core at 10 locations and calculating the arithmetic mean of the 8 outer diameters after removing the maximum and minimum values.

[0100] When the core 11 is cylindrical, its inner diameter is not particularly limited and can be 20mm or more and 7500mm or less. The lower limit of the inner diameter of the core 11 can be 50mm or more, 80mm or more, 120mm or more, or 150mm or more. The upper limit can be less than 4500mm, less than 3000mm, less than 1500mm, less than 900mm, less than 600mm, less than 400mm, less than 250mm, or less than 200mm. The inner diameter of the core can be determined as follows: measure the inner diameter of the core at 10 locations, and calculate the arithmetic mean of the 8 inner diameters remaining after removing the maximum and minimum values.

[0101] To mitigate the step difference caused by the beginning of the sheet winding, a step difference is sometimes formed on the outer peripheral surface of the core where the sheet contacts, so that the beginning of the sheet winding is closer to the center of the core. However, no such step difference is formed on the outer peripheral surface 11A of the core 11 where the sheet 12 contacts. By using a core 11 without a step difference on the outer peripheral surface 11A, various thicknesses of sheet 12 can be accommodated. In this specification, "no step difference is formed on the outer peripheral surface of the core where the sheet contacts" means that there is no portion with a height difference of 3 μm or more in the central portion of the core and in each circumference of the core extending 100 mm or more from the central portion along the width direction of the core. Alternatively, a step difference of less than 3 μm can be formed on the outer peripheral surface 11A of the core 11 where the sheet 12 contacts. Even with such a step difference, there are no problems in use, and the sheet 12 is easily peeled off from the core 11.

[0102] The material constituting the core 11 is not particularly limited. Examples of materials constituting the core 11 include paper, plastic, and metal. Paper also includes paper impregnated with resin. Examples of plastics include fiber-reinforced plastics (FRP), polyolefins such as polyethylene (PE) or polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), phenolic resin, and nylon. Among these, for example, in the case of optical coating processing, fiber-reinforced plastics (FRP) are preferred from the viewpoints of weight, processability, and strength. Examples of fiber-reinforced plastics include materials made by mixing fibers such as glass, epoxy resin, polyester, carbon, and aromatic polyamide into a main body composed of epoxy resin or phenolic resin. Examples of metals include iron, stainless steel (SUS), and aluminum.

[0103] <<Sheet>>

[0104] Sheet 12 is elongated. Specifically, sheet 12 is thin enough relative to its width and long enough.

[0105] The width W2 of sheet 12 (refer to) Figure 2 The width of the sheet is not specifically limited; for example, it can be between 0.1m and 50m. In this specification, "sheet width" refers to the length of the sheet along its short side (the core in the width direction). The lower limit of the width W2 of sheet 12 can be 0.2m or more, 0.3m or more, 0.5m or more, 1.0m or more, or 2.0m or more, and the upper limit can be less than 30m, less than 20m, less than 10m, less than 7m, less than 5m, less than 3.5m, or less than 3m. The width of the sheet can be determined as follows: measure the width of the sheet at 10 locations, and calculate the arithmetic mean of the 8 widths remaining after removing the maximum and minimum values ​​from the 10 measurements.

[0106] The width W2 of the sheet 12 is preferably smaller than the width W1 of the core 11. This allows the core 11 to reliably hold the sheet 12. For example, if the width W2 of the sheet 12 is 1 mm or more but less than 50 mm smaller than the width W1 of the core 11, then when the product side is covered, the unused portion is reduced, allowing for efficient selection, which is therefore preferred. The lower limit of this difference can be 1 mm or more, 20 mm or more, or 50 mm or more, while the upper limit can be 70 mm or less, 40 mm or less, or 25 mm or less.

[0107] The length of sheet 12 can be, for example, 20m or more and less than 10,000m. In this specification, "sheet length" refers to the length of the sheet along DR2 (refer to...). Figure 3The length of the sheet 12 can be 30m or more, 40m or more, or 50m or more, and the length can be less than 9000m or less than 8000m.

[0108] The thickness of the sheet 12 is not particularly limited, and can be, for example, 3 μm or more and 600 μm or less. The lower limit of the thickness of the sheet 12 can be 10 μm or more, 15 μm or more, 20 μm or more, or 30 μm or more, and the upper limit can be 500 μm or less, 400 μm or less, 300 μm or less, 200 μm or less, 110 μm or less, or 80 μm or less. Where a thin film is preferred depending on the application, this is not a limitation, but 3 μm or more and less than 50 μm is preferred, and more preferably 40 μm or less. The thickness of the sheet can be determined by measuring the thickness of the sheet at 10 locations and calculating the arithmetic mean of the 8 thicknesses after removing the maximum and minimum values ​​from the 10 measured thicknesses. Furthermore, the aforementioned step difference is less likely to occur when the sheet thickness is thicker, but the more significant the step difference becomes when the sheet is thinner. This invention is particularly effective when the sheet thickness is relatively thin (80 μm or less, less than 50 μm, and further less than 40 μm).

[0109] When the sheet 12 comprises, for example, acrylic resins, polyester resins (especially polyethylene terephthalate), or cyclic olefin polymer resins, the thickness of the sheet 12 is preferably 15 μm or more and 300 μm or less. When the sheet 12 comprises any of these resins, the thinner the sheet, the more pronounced the aforementioned step difference; however, if the sheet thickness is extremely thin, the aforementioned step difference tends to decrease. For example, in the case of a heating process of 50°C or higher in a subsequent process, if the sheet is thin, deformation based on the aforementioned step difference can sometimes be eliminated. However, if the sheet thickness is a certain level (e.g., 15 μm or more), even with a heating process, the aforementioned deformation may not be eliminated. Therefore, the present invention is particularly effective when the thickness of the sheet 12 is 15 μm or more. Furthermore, when the sheet 12 comprises any of these resins, if the sheet thickness is too thick, a large amount of coating material is required. Therefore, from the viewpoint of cost reduction, the thickness of the sheet 12 is preferably 300 μm or less. Furthermore, in cases where any of these resins are contained, if the thickness exceeds 300 μm, it may be difficult to generate a step difference. When the sheet 12 contains any of these resins, the lower limit of the thickness of the sheet 12 is more preferably 20 μm or more, 35 μm or more, or 50 μm or more, and the upper limit of the thickness of the sheet 12 is more preferably 250 μm or less, 200 μm or less, 150 μm or less, or 100 μm or less. In cases where any of these resins are contained, the present invention is particularly effective for thicknesses that are neither too thin nor too thick.

[0110] When sheet 12 is a glass film (described later), the thickness of the glass film is preferably 5 μm or more and 100 μm or less. If the thickness of the glass film is 5 μm or more, it can maintain the physical properties of glass; conversely, if the thickness of the glass film is 100 μm or less, it is easy to roll into a roll. From the viewpoint of minimizing crack formation or minimizing breakage even with minor cracks, the lower limit of the glass film thickness can be 10 μm or more, 15 μm or more, or 20 μm or more. Furthermore, from the viewpoint of achieving elongation and thinness, the upper limit of the glass film thickness can be 40 μm or less, 30 μm or less, or 25 μm or less.

[0111] When sheet 12 is paper (described later), the paper thickness is preferably 50 μm or more and 110 μm or less. If the paper thickness is 50 μm or more, long-term strength can be ensured; conversely, if the paper thickness is 110 μm or less, it is easy to roll into a roll. From the viewpoint of ease of processing, the lower limit of the paper thickness can be 50 μm or more, 60 μm or more, or 70 μm or more. Furthermore, from the viewpoint of achieving a longer roll, the upper limit of the paper thickness can be 100 μm or less, 90 μm or less, or 80 μm or less.

[0112] Furthermore, when the fixing member 17 is provided, since the sheet 12 is disposed on the fixing member 17, the combined thickness of the sheet 12 and the fixing member 17 will affect the step difference caused by the starting end of the sheet winding. Therefore, for example, if the thickness of the fixing member 17 is assumed to be 3 μm or more and 10 μm or less, it is preferable that the sheet 12 is thinner, and its upper limit is preferably 130 μm or less, more preferably 90 μm or less. In addition, if the fixing member is an adhesive tape, if the thickness of the fixing member exceeds 15% of the thickness of the sheet, it is more likely to affect the aforementioned step difference. Therefore, the thickness of the sheet 12 should preferably not be too thin, and the lower limit of the thickness of the sheet 12 is preferably, for example, 20 μm or more or 35 μm or more.

[0113] Examples of sheet materials include films, metal foils, and paper (e.g., wallpaper). Films can be, for example, resin films or glass films. In this specification, "glass film" refers to a flexible glass substrate that can be rolled into a roll. When using resin films or glass films in applications requiring light transmittance (e.g., optical film applications), the resin film or glass film preferably has light transmittance. The resin constituting such a resin film is not particularly limited as long as it has light transmittance; examples include acrylic resins, polyolefin resins (polyethylene resins, polypropylene resins, cyclic olefin polymer resins), polycarbonate resins, polyacrylate resins, polyester resins (polyethylene terephthalate, polyethylene naphthalate, etc.), aromatic polyetherketone resins, polyethersulfone resins, acetylcellulose resins (e.g., triacetylcellulose resins), polyimide resins, polyamide-imide resins, polyamide resins, or mixtures of two or more of these resins. Among them, resin films with high flexibility, such as those containing acrylic resins, polyolefin resins, polyester resins, acetylcellulose resins, polyimide resins, polyamide-imide resins, or polyamide resins, are prone to deformation due to step differences caused by the starting end of the sheet winding or by the fixing components. Therefore, the technology of the present invention is effective. Furthermore, in recent years, low-moisture-permeable resins with low deformation and low moisture permeability have been preferred in large displays. In the case of large displays, since the sheet width is often integral to the product, even if there is residual deformation based on step differences in some areas, the entire product must be discarded. For example, acrylic resins, polyester resins, and cycloolefin polymer resins are preferred for large displays, but according to the technology of the present invention, since deformation based on step differences can be well prevented and mass production can be improved, the technology of the present invention is particularly effective for sheets made of these resins. In addition, when the final product requires thinness, for example, when using a film with a thickness of less than 50 μm, the technology of the present invention is suitable for films of any material.

[0114] The in-plane phase difference (retardation: Re) of the sheet 12 is not particularly limited. For example, the in-plane phase difference Re of the sheet 12 can be 1 nm or more and 20,000 nm or less. When the sheet 12 is used for optical film applications, especially when it contains acrylic resin or cyclic olefin polymer resin, the in-plane phase difference Re of the sheet 12 is preferably 10 nm or less. An in-plane phase difference Re of 10 nm or less means that the optical strain is small, and it can be said that there is almost no residual stress in the sheet 12 during manufacturing. That is, when the in-plane phase difference Re of the sheet 12 is 10 nm or less, the polymer in the sheet 12 is uniform, so when the sheet 12 is made into a long roll, it is not easy to generate new step differences caused by the polymer state inside the sheet 12, which is preferred. Regarding the upper limit of the in-plane phase difference Re of the sheet 12, in display applications, from the viewpoint that it is not easy to generate color unevenness or blackening that becomes a problem when used in combination with polarizers, it is more preferable to be 8 nm or less or 4 nm or less. In the case of acrylic resins, if it is for optical applications, it is preferable that whitening does not occur when bending occurs as is the case with conventional acrylic resin films, and that the haze value (total haze value) is as low as 1% or less or 0.5% or less.

[0115] Furthermore, when the sheet 12 is used for optical films and contains polyester resin, as described above, it is preferable that a new step difference caused by the internal polymer state is less likely to occur when the polymer within the sheet 12 is uniform. When the sheet 12 contains polyester resin, stretching is essential to obtain physical strength. Therefore, to ensure the polymer state is as uniform as possible, it can be manufactured by biaxial stretching sequentially or simultaneously in both the longitudinal and transverse directions at approximately the same ratio. As a result, a sheet containing polyester resin with a smaller in-plane phase difference than previously possible can be obtained. This smaller in-plane phase difference refers to a sheet thickness of 10 μm to 90 μm and an in-plane phase difference of 1500 nm or less, preferably 1200 nm or less, more preferably 1000 nm or less, and even more preferably 800 nm or less. Furthermore, to ensure good physical properties such as elastic modulus or tear strength of the biaxially stretched polyester plastic film, the in-plane phase difference should preferably not be too small, preferably 200 nm or more, more preferably 400 nm or more.

[0116] Furthermore, to improve physical properties, it is preferable to consider the balance between birefringence in the in-plane direction and birefringence in the thickness direction. As an indicator, the Nz coefficient is used. The Nz coefficient is affected by the crystallinity and orientation of the film, and therefore relates to the overall properties of the sheet. In the case of, for example, polyethylene terephthalate, the Nz coefficient is typically 2 to 4. Especially when manufactured in long rolls, considering the likelihood of generating new step differences due to the polymer state within the sheet, the Nz coefficient is preferably 5 or higher, more preferably 8 or higher, and most preferably 10 or higher. The upper limit of the Nz coefficient is around 80, preferably 70 or lower, and most preferably 50 or lower.

[0117] The in-plane phase difference (Re) is expressed by the following formula (1) based on the refractive index nx in the direction of maximum in-plane refractive index (slow axis), the refractive index ny in the direction orthogonal to the slow axis (fast axis), and the thickness t (nm) of the sheet. According to formula (1), a smaller in-plane phase difference indicates a lower degree of orientation, thus tending towards better bending resistance. The in-plane phase difference (Re) can be measured, for example, by a device manufactured by Otsuka Electronics Co., Ltd., under the trade name "RETS-100".

[0118] In-plane phase difference (Re) = (nx - ny) × t…(1)

[0119] The Nz coefficient is expressed by the refractive index nz, nx and ny in the thickness direction of the sheet, as shown in the following formula (2).

[0120] Nz coefficient = (nx - nz) / (nx - ny)...(2)

[0121] When using the RETS-100 to measure the aforementioned Re, the measurement can be performed according to the following steps. First, to stabilize the RETS-100 light source, let the light source stand for at least 60 minutes after it is turned on. Then, select the rotating polarizer method and select the θ mode (angular direction phase difference measurement mode). By selecting this θ mode, the stage becomes a tilting rotating stage.

[0122] Next, enter the following measurement conditions in RETS-100.

[0123] (Measurement conditions)

[0124] • Delay measurement range: Rotating polarizer method

[0125] • Measuring point diameter: φ5mm

[0126] • Tilt angle range: -40° to 40°

[0127] • Measurement wavelength range: 400nm~800nm

[0128] • The average refractive index of the sample (e.g., N = 1.617 in the case of PET, and 1.5 in the case of acrylic film).

[0129] • Thickness: Thickness measured separately using SEM or optical microscope

[0130] Next, background data is obtained without setting up samples in the device. The device is configured as a closed system, which is implemented whenever the light source is turned on.

[0131] Then, the sample is placed on the worktable within the apparatus. The sample can be of any shape, such as a rectangle. The sample size can also be 50mm × 50mm. However, the sample is cut from a portion of the sheet that extends at least 35mm inward from each end of the sheet (e.g., the center of the sheet). If multiple samples are present, they must all be arranged in the same orientation. For example, to ensure that all samples are arranged in the same orientation, it is preferable to mark all samples beforehand.

[0132] After setting up the sample, in an environment with a temperature of 23±5℃ and a relative humidity of 50±20%, the stage was rotated 360° in the XY plane to measure the fast and slow axes. After the measurement, the slow axis was selected. Then, while tilting the stage towards the set angle range centered on the slow axis, measurements were taken in 10° increments to obtain data (Re) for the set tilt angle range and set wavelength range. The in-plane phase difference Re was set to the value when measured with light at an incident angle of 0° and a wavelength of 589nm. The in-plane phase difference Re was measured at 5 different points. Specifically, firstly, as... Figure 10 As shown, two orthogonal imaginary lines IL1 and IL2 are drawn passing through the center A1 of the sample SA. When these imaginary lines IL1 and IL2 are drawn, the sample is divided into four partitions. Then, a point equidistant from the center A1 is set in each partition, for a total of four points A2 to A4. Measurements are taken at the center A1 and points A2 to A4, a total of five points. Then, the arithmetic mean of the three points after removing the maximum and minimum values ​​from the five measurements is taken as the in-plane phase difference Re.

[0133] The sheet 12 can be a single-layer structure or a laminated structure consisting of two or more layers. Specifically, the sheet 12 can be a substrate monomer or a functional layer monomer, such as a laminate with one or more functional layers formed on a substrate (e.g., an optical laminate). In the substrate, for ease of bonding, there may be substrates with a base layer formed on one or both sides. In this specification, "substrate" includes not only substrates without a base layer but also substrates with a base layer on one or both sides. That is, in this specification, when a base layer is formed on a substrate, the laminate of the substrate and the base layer is considered the substrate. However, in this case, the base layer is the base layer in contact with the substrate, excluding base layers not in contact with the substrate. The thickness of the base layer is typically 0.01 μm or more and 1.0 μm or less. Furthermore, in this specification, "functional layer" refers to a layer in the laminate that is intentionally designed to perform a certain function. Specifically, functional layers may include, for example, a base layer not in contact with the substrate, a hard coating layer, an impact-absorbing layer, an anti-glare layer, an antistatic layer, a conductive layer, a heat dissipation layer, an ultraviolet absorption layer, a special wavelength absorption layer, a special wavelength transmission layer, a color reproduction enhancement layer, a liquid crystal layer, a phase difference adjustment layer, a viewing angle adjustment layer, a reflective layer, a coloring layer, an anti-reflective layer (high refractive index layer, low refractive index layer), an anti-fouling layer, a water-repellent layer, an oil-repellent layer, or combinations thereof. The term "functional layer" in this specification can refer to a single-layer structure or a multilayer structure. However, in this specification, "functional layer" refers to a layer that is present even when using the sheet 12, excluding release liner that is peeled off during use. If a release liner is present on the sheet, defects are easily generated, and new step differences different from the aforementioned step differences are easily created. Assuming that a release liner is provided on the sheet 12, it is wound onto the core 11 in the state after the release liner has been peeled off.

[0134] The applications of sheet 12 are not particularly limited, but can include, for example, optical applications (optical film applications, polarizing plate applications, display device applications), door and window applications, automotive interior decoration applications, battery component applications, food packaging material applications, agricultural applications, cosmetic applications, design applications, medical applications, etc. Among these, for films used in optical applications, if there is a step difference caused by the beginning of the sheet winding or by the fixing components, it may not only affect the appearance but also the light transmittance. Therefore, the technology of this invention is particularly effective in optical applications.

[0135] Sheet 12 has a winding start end 12A (see reference) Figure 3 ) and winding end 12B (refer to Figure 1 In the roll 10, the winding start end 12A is located closer to the core 11 than the winding end end 12B. In the roll 10, as... Figure 3As shown, the end face 12A1 of the winding start end 12A located in the length direction DR2 is approximately aligned with the second end face 17B of the fixing member 17 in the radial direction DR3 (the normal direction of the outer peripheral surface 11A of the winding core 11) of the winding core 11. In this specification, "approximately aligned" means that the distance between the end face 12A1 of the winding start end 12A in the length direction DR2 and the second end face 17B is the width W3 of the fixing member 17 (see reference). Figure 4 Within ±20%. In addition, the above "+" means that the end face 12A1 protrudes more than the second end face 17B, and the above "-" means that the end face 12A1 is recessed from the second end face 17B (i.e., the second end face 17B protrudes more than the end face 12A1).

[0136] <<Fixed Components>>

[0137] The fixing member 17 is used to fix a portion of the sheet 12 to the outer peripheral surface 11A of the core 11. The fixing member 17 extends along the width direction DR1 of the core 11. Thus, a portion of the sheet 12 can be fixed to the outer peripheral surface 11A of the core 11 along the width direction DR1 of the core 11.

[0138] The fixing member 17 has a second end face 17B opposite to the first end face 17A. Both the first end face 17A and the second end face 17B extend along the width direction DR1 of the core 11. The second end face 17B is located closer to the winding start end 12A than the first end face 17A.

[0139] exist Figure 3 In this configuration, the fixing member 17 is tightly attached to the outer peripheral surface 11A of the core 11 and the winding start end 12A of the sheet 12, fixing the winding start end 12A of the sheet 12 to the outer peripheral surface 11A of the core 11. Alternatively, if it is the first turn of the sheet 12, the sheet 12 can also be fixed at a portion other than the winding start end 12A. Figure 3 In the middle, the entire front side of the fixing component 17 is in close contact with the winding start end 12A, but as Figure 9 As shown in the roll 40, as long as the winding start end 12A is fixed relative to the fixing member 17 to a degree that will not cause problems during winding, for example, to a degree that the winding start end 12A will not peel off from the fixing member 17 during winding, the first filling part 14 and the first exposure suppression member 18 can also enter between the winding start end 12A and the fixing member 17.

[0140] The fixing component 17 is not particularly limited, and examples include adhesive components, double-sided tape, and other bonding components. The fixing component 17 may also be elastic (cushioning). The adhesive component is adhesive on both sides.

[0141] The width W3 of the fixed component 17 (refer to) Figure 4 The width W3 of the fixing member 17 is preferably 5 mm or more and 100 mm or less. If the width W3 of the fixing member 17 is 5 mm or more, a portion of the sheet 12 can be reliably fixed to the outer peripheral surface 11A of the core 11. Furthermore, if it is 100 mm or less, the sheet 12 can be wound without wrinkling. In this specification, "width of the fixing member" refers to the distance from the first end face to the second end face. The lower limit of the width W3 of the fixing member 17 is preferably 10 mm or more, 20 mm or more, or 30 mm or more, and the upper limit is preferably 50 mm or less or 40 mm or less.

[0142] The thickness of the fixing member 17 is preferably 3 μm or more and 600 μm or less. If the thickness of the fixing member 17 is 3 μm or more, a portion of the outer peripheral surface 11A of the core 11 can be reliably fixed. Furthermore, if the thickness is 600 μm or less, deformation of the sheet 12 can be further suppressed. The lower limit of the thickness of the fixing member 17 is preferably 5 μm or more, 10 μm or more, or 20 μm or more, and the upper limit is preferably 200 μm or less, 100 μm or less, or 50 μm or less. The thickness of the fixing member can be obtained by measuring the thickness of the fixing member at 10 locations and calculating the arithmetic mean of the thicknesses at those 10 locations.

[0143] <First Gap>

[0144] The first gap 13 is the gap that connects with the end face 12A1 of the winding start end 12A located in the length direction DR2. Specifically, Figure 3 The first gap 13 shown is a gap surrounded by the outer peripheral surface 11A of the core 11, the back surface 12C of the first-turn sheet 12, the end surface 12A1 of the winding start end 12A, and the second end surface 17B of the fixing member 17. Without the fixing member 17, the first gap is a gap surrounded by the outer peripheral surface of the core, the back surface of the first-turn sheet, and the end surface of the winding start end.

[0145] The first gap 13 is the gap that connects with the end face 12A1, and it is also the gap located between the core 11 and the sheet 12 of the first circumference and that connects with the second end face 17B. Therefore, it is also the third gap described later.

[0146] <Second Gap>

[0147] The second gap 15 is the gap between the first end face 17A of the fixing member 17 and the fixing member 17. Specifically, Figure 3 The second gap 15 shown is a gap surrounded by the outer peripheral surface 11A of the core 11, the back surface 12C of the first sheet 12, and the first end face 17A of the fixing member 17.

[0148] <First Filling Section>

[0149] The first filling portion 14 fills the first gap 13. That is, the first filling portion 14 is in contact with the outer peripheral surface 11A of the core 11, the back surface 12C of the first circumference sheet 12, the end surface 12A1 of the winding start end 12A, and the second end surface 17B of the fixing member 17. Alternatively, when the fixing member 17 is not provided, the first filling portion is in contact with the outer peripheral surface of the core, the back surface of the first circumference sheet, and the end surface of the winding start end. In this specification, "filling" refers to a state in which the gap is substantially filled by the material constituting the filling portion. However, it is also possible for the filling portion to have voids inside.

[0150] Sheet 12 has: an effective area R1 for use in the product (refer to...) Figure 2 ); and non-effective areas R2 located on both sides of the effective area R1 in the width direction DR1 of the core and not used as products (see reference). Figure 2 The first filler portion 14 is present at least in the effective region R1. Since the effective region R1 is the area used for the product, it is preferable that the first filler portion 14 is present throughout the entire effective region R1 in the width direction DR1 of the core 11. Furthermore, the ineffective region R2 is an area that is not originally used for the product, and there is no need to mitigate the aforementioned step difference; therefore, it is not a problem even if the first filler portion 14 is not present in the ineffective region R2. The ineffective region R2 varies depending on the application and width of the sheet, but it is generally an area within 10mm to 30mm from both ends in the width direction of the sheet inward.

[0151] Regarding the edge thickness T1 of the end portion 14B on the separation position P1 side of the first week sheet 12 in the first filling section 14, where the sheet 12 separates from the core 11 (refer to...) Figure 4If the thickness is too thick, a new step difference may be formed due to the thickness, so a thinner thickness is preferred. Specifically, for example, the edge thickness T1 is preferably 50 μm or less. From the viewpoint of being able to shorten the distance from the winding start end 12A to the point where the deformation caused by the step difference at the winding start end 12A becomes visually imperceptible, i.e., the deformation mitigation length, the edge thickness T1 is more preferably 30 μm or less, 20 μm or less, 10 μm or less, 5 μm or less, and more preferably 2 μm or less. The more the step difference caused by the winding start end is mitigated, the more the deformation of the sheet caused by the step difference is mitigated, and therefore the deformation mitigation length is shorter. In this specification, "deformation mitigation length" is used not only to mean the length until the deformation of the sheet caused by the step difference caused by the winding start end is mitigated, but also sometimes to mean the length until the deformation of the sheet caused by the step difference caused by the fixing member becomes visually imperceptible. When the deformation easing length is used to mean the length until the deformation of the sheet caused by the step difference due to the fixing member becomes visually imperceptible, the deformation easing length is the distance from the winding start end 12A to the point where the deformation caused by the step difference due to the fixing member 17 becomes visually imperceptible. The deformation easing length is preferably short, specifically, preferably 100m or less, 75m or less, 60m or less, 50m or less, 35m or less, 20m or less, or 15m or less. Furthermore, if the deformation easing length is 75m or less, the portion of the sheet deformation that is visually imperceptible becomes larger, which is therefore desirable. As described above, the deformation easing length is the length until the deformation of the sheet caused by the step difference becomes visually imperceptible, but the presence of a step difference is determined in the following manner. First, in an indoor environment with a brightness of 800 Lux to 2000 Lux, a white light source tube (e.g., a 40W straight LED tube (power consumption 18W, total luminous flux 3100Lm, color temperature 5000K)) is projected onto a strip-shaped sheet. A portion where the outline of the projected white light source tube is distorted compared to the rest of the sheet is considered to have a step difference; a portion where the outline of the projected white light source tube around the edge of the step difference is considered to have the same shape as the rest of the sheet is considered to have no step difference. The white light source tubes are arranged such that their length direction runs along the length direction of the sheet. The length of the white light source tubes can be varied depending on the width and length of the sheet. Specifically, the preferred length of the white light source tubes is the length covering both the portion with and without a step difference in the sheet. This makes it easy to identify the portion with a step difference. Furthermore, if the observation environment has the brightness level described above, the white light source tubes may or may not be illuminated. When observing, it is important to observe the state of the white light source shining into the sheet and being able to see its outline.Therefore, as an observation condition, it is appropriate to choose the side where the outline of the white light source tube can be clearly seen. For example, if the outline of the white light source tube is easier to see on the back side of the sheet than on the front side, the white light source tube can be projected onto the back side of the sheet to confirm whether a step difference exists. Specifically, for example, in the case of a laminate with a functional layer such as an anti-glare layer that is not easily projected onto the front side of the substrate, it is sometimes difficult to confirm whether a step difference exists when observing from the anti-glare layer side. Therefore, in this case, the white light source tube can be projected onto the back side of the substrate where the anti-glare layer is not laminated to confirm whether a step difference exists. It should be noted that this judgment can also be applied to rolls for various purposes, such as laminates with one or more functional layers laminated on the substrate, laminates attached to polarizing sheets, etc. For example, in the case where an anti-glare layer is laminated on the substrate as a functional layer, the judgment can also be made as follows: for the part where a step difference exists, the uneven shape that performs the anti-glare function under pressure appears to be crushed, producing shadows or other coloration. In addition, when there are various functional layers stacked on top of each other, and the white light tube is difficult to reflect into the visually recognizable side of the scroll or its opposite side, it is possible to make a judgment as described above by seeing different coloring from other parts through shadows due to shape changes.

[0152] Furthermore, when the sheet 12 is a film with a thickness of 3 μm or more but less than 50 μm, it is more susceptible to the effects of the step difference caused by the winding start end 12A compared to the case of a thicker film. Therefore, when using such a film, the edge thickness T1 is preferably 10 μm or less. Moreover, from the viewpoint of minimizing the aforementioned deformation mitigation length, it is more preferably 7 μm or less, 5 μm or less, and even more preferably 1 μm or less. The lower limit of the edge thickness T1 can be 0.1 μm or more, 0.3 μm or more, or 0.5 μm or more.

[0153] From the viewpoint of minimizing the aforementioned deformation mitigation length, the edge thickness T1 is preferably the thickness described above. However, there is a situation where the surface of the core has undergone surface finishing, resulting in unevenness. At the end of the first filling portion, the material constituting the first filling portion is embedded along this unevenness, potentially causing unevenness between portions where the edge thickness T1 exists and portions where it does not. However, if the edge thickness T1 is thinner, even with such unevenness, no actual damage will occur. Therefore, in cases where unevenness exists, the edge thickness T1 is preferably thinner; specifically, for example, the edge thickness T1 is preferably 15 μm or less, 10 μm or less, 5 μm or less, or 1 μm or less. The lower limit of the edge thickness T1 in this case can be 0.1 μm or more, 0.3 μm or more, or 0.5 μm or more.

[0154] On the other hand, there are also effects caused by the presence of the edge thickness T1. For example, the core is often reused after the roll body is used. Therefore, for the core, the following reprocessability is required: the filling portion, such as the first filling portion, which is in contact with the core, can be peeled off from the core, or removed by washing or wiping, thereby reusing the core. Therefore, for example, it is preferable that the first filling portion 14 is not bonded to the core 11 as described later. In addition, at the portions where the first filling portion 14 is in contact with the core 11 and the sheet 12 respectively, it is preferable that the sheet 12 is cleanly peeled off from the first filling portion 14. If the first filling portion 14 agglomerated and broke during the peeling of the sheet 12 from the first filling portion 14, it may be difficult to completely peel the first filling portion 14 off from the core 11. In contrast, if the edge thickness T1 exists, it becomes the starting point for peeling off the sheet 12, so from the viewpoint of reprocessability, it is preferable that the edge thickness T1 is intentionally present. For example, from the viewpoint of reprocessability, the edge thickness T1 is preferably 5 μm or more. Regarding this edge thickness T1, the preferred thickness varies depending on the material of the core or sheet; it can be set to 1.5 μm or more, or further to 5 μm or more. Regarding the upper limit of the edge thickness, since new step differences may form due to the thickness, it is preferably 30 μm or less.

[0155] The edge thickness T1 can be measured using a scanning optical interferometry surface shape measuring instrument. Examples of such instruments include the "New View" series manufactured by Zygo Corporation.

[0156] Specifically, the edge thickness T1 can be determined using a scanning optical interferometry surface shape measuring instrument (product name "New View7300", manufactured by Zygo Corporation) as follows: First, if the entire sheet is fed out, the first filler portion 14 may be attached to the side of the sheet 12 and peeled off from the core. With the first filler portion 14 attached to the side of the fed-out sheet 12, at least one sample with a size of 0.5 mm square or more, including the end portion 14B of the first filler portion 14, is obtained from the sheet. Furthermore, the sample size of 0.5 mm square or more is not limited to a square; it can also be rectangular (e.g., 2 mm × 5 mm). The sample is cut from any part containing the first filler portion 14 that is free of dirt, fingerprints, etc. Then, the edge thickness T1 of the first filler portion 14 is measured under the following measurement conditions. The edge thickness T1 can be determined by measuring the edge thickness at 10 locations and calculating the arithmetic mean of the 8 thicknesses remaining after removing the maximum and minimum values ​​from the 10 measured thicknesses.

[0157] (Measurement conditions)

[0158] • Objective lens: 10x

[0159] • Zoom: 1x

[0160] • Measurement area: 2.17mm × 2.17mm

[0161] • Scan Length: 5μm

[0162] min mod: 0.015

[0163] Regarding the thickness T2 of the first filling portion 14 at the position where it connects with the end face 12A1 (refer to...) Figure 4 When the fixing member 17 is present, the thickness T2 is preferably thicker than the combined thickness of the fixing member 17 and the sheet 12. Furthermore, when the fixing member 17 is absent, the thickness T2 is preferably thicker than the sheet 12. By setting the thickness T2 to such a thickness, the step difference caused by the winding start end 12A can be mitigated more effectively. However, if the thickness T2 is too thick, although the step difference caused by the winding start end 12A can be mitigated, it may sometimes adversely affect the winding of the sheet 12. Therefore, for example, when the thickness of the sheet 12 is 50 μm or more and 200 μm or less, the thickness T2 is preferably 52 μm or more and 220 μm or less, more preferably 52 μm or more and 150 μm or less. Additionally, when the thickness of the sheet 12 is 3 μm or more and less than 50 μm, the thickness T2 is preferably 50.5 μm or more and 100 μm or less.

[0164] The thickness T2 of the first filling portion 14 at the position where it contacts the end face 12A1 can be measured in the following manner. The measurement method for thickness T2 can differ depending on whether the first clamping portion 20 is present or absent. When the first clamping portion 20 is absent, a laser displacement gauge or a stereomicroscope can be used for measurement; when the first clamping portion 20 is present, a stereomicroscope can be used for measurement. The thickness T2 measurement based on the laser displacement gauge or stereomicroscope is performed in an environment with a temperature of 23±5°C and a relative humidity of 50±20%.

[0165] The thickness T2 measured using a laser displacement gauge can be performed as follows. This measurement method, which utilizes laser reflection, is particularly effective when the sheet 12 is transparent and the first filling portion is opaque (e.g., when it is colored). First, prepare a fixture for rotating the roll 10 and a laser displacement gauge (e.g., product name "LK-G30", manufactured by KEYENCE Co., Ltd.), and position them accordingly. The fixture is configured to be inserted into the hole 11B in the width direction DR1 of the core 11, thus holding the roll 10 in a position capable of rotation. While the LK-G30 is listed as a laser displacement gauge, equivalent laser displacement gauges, even if not the LK-G30, can be used.

[0166] The laser displacement meter has a laser source and a light-receiving element. It is a device that can receive laser light irradiated from the laser source and reflected on the surface of the first filling part 14 by means of the light-receiving element, and thereby measure displacement according to the light-receiving position in the light-receiving element.

[0167] Three laser displacement gauges are positioned above the roll body 10, arranged to irradiate the surface of the roll body 10 with laser light. The configuration of the laser displacement gauges is described below. First, as... Figure 11 As shown, positions B1 and B2 are defined to divide the width of sheet 12 into three equal parts. Position B1 is located on the side of the first end 12G1 in the width direction of sheet 12 (the width direction DR1 of core 11), and position B2 is located on the side of the second end 12G2 opposite to the first end 12G1. Furthermore, a first laser displacement meter is configured to irradiate a laser at the midpoint C1 between position B1 and the first end 12G1, a second laser displacement meter is configured to irradiate a laser at the midpoint C2 between position B1 and the second end 12G2, and a third laser displacement meter is configured to irradiate a laser at the midpoint C3 between position B2 and the second end 12G2.

[0168] Then, the roll 10 is mounted on the fixture, and the sheet 12 is fed out until the first filling portion 14 is exposed from the roll 10. Then, with the first filling portion 14 exposed, the core 11 is rotated at a speed of 30 mm / s while the displacement is continuously measured using a laser displacement meter at a sampling period of 200 μs, resulting in a graph with the horizontal axis set to position (mm) and the vertical axis set to displacement (mm) (see reference). Figure 12 The measurement is performed from the end portion 14B of the first filling portion 14 toward the position where it contacts the end surface 12A1. In this measurement, the reference height (the line with a displacement of 0 mm) is taken as the height of the core 11, and the difference between the reference height and the displacement of the first filling portion 14 is taken as the thickness of the first filling portion 14. In addition, in this graph, one scale on the horizontal axis is set to 5 mm, and one scale on the vertical axis is set to 0.02 mm.

[0169] In this curve, at the location where the first filling portion 14 exists, the displacement increases from the end portion 14B, but decreases sharply after the position where the first filling portion 14 connects with the end surface 12A1. Therefore, the position E1 on the displacement curve where the displacement begins to decrease sharply is identified in the curve. Then, by calculating the difference between the line where the displacement is 0 mm and the displacement at position E1, the thickness T2 at the position where the first filling portion 14 connects with the end surface 12A1 is determined.

[0170] The thickness T2 measured using a stereo microscope can be performed as follows: First, a portion of the sheet 12, including the starting end 12A of the winding, the first filling portion 14, and the second circumference, is selected and fixed in such a way that it is not crushed. Then, the cross-section of the fixed portion is ground, and the thickness T2 of the first filling portion 14 is measured using a stereo microscope (e.g., a digital microscope VHX-7000, manufactured by KEYENCE Co., Ltd.). While the digital microscope VHX-7000 is mentioned as a stereo microscope, equivalent stereo microscopes, even if not VHX-7000, can be used.

[0171] The first filling portion 14 preferably includes a coloring material and a luminescent material. By including the coloring material and the luminescent material in the first filling portion 14, it is easy to visually confirm when the first filling portion 14 overflows from the roll body 10. In addition, the thickness, length, etc. of the first filling portion 14 are easy to confirm.

[0172] When the first filler portion 14 is colored, there is no particular limitation on the color of the first filler portion 14, but from the viewpoint that the presence of the first filler portion 14 can be reliably detected and that the components of the first filler portion 14 are not easily noticeable even if they are attached to the winding device, white, gray, etc. are preferred.

[0173] When the first filler portion 14 is colored, the first filler portion 14 contains a coloring material. When the first filler portion 14 is a cured coating material, the coloring material is preferably a material that does not hinder curing. The coloring material can be any of pigments and dyes, and can also be any of organic and inorganic coloring materials. Examples of specific coloring materials include titanium dioxide, carbon black, or mixtures thereof.

[0174] When the first filler portion 14 is colored, the content of the coloring material in the first filler portion 14 is preferably 0.1% by mass or more and 50% by mass or less. If the content of the coloring material is 0.1% by mass or more, the first filler portion 14 can be visually confirmed. In addition, if it is 50% by mass or less, the reprocessability of the first filler portion 14 can be well maintained even if the coloring material is an inorganic or organic material.

[0175] When the first filling portion 14 contains a luminescent material, there is no particular limitation on the luminescent material, and examples include fluorescent materials and phosphorescent materials. When the first filling portion 14 contains a fluorescent material or a phosphorescent material, the fluorescent material or phosphorescent material in the first filling portion 14 can emit light by irradiating the first filling portion 14 with light such as ultraviolet light or visible light.

[0176] Surface 14C of the first filling part 14 (refer to) Figure 5 The shape of the surface 14C is preferably an upwardly convex shape. If the surface 14C is an upwardly convex shape, it can lift the sheet 12 compared to a downwardly concave shape, thus mitigating the aforementioned step difference. Whether the surface 14C is an upwardly convex shape can be determined, similarly to the thickness T2, based on the position displacement curve graph. Specifically, firstly, in the aforementioned curve graph, at the location where the first filling part 14 exists, the position is higher than the height of the core 11, thus the displacement increases. The intersection of the line where the displacement begins to increase (0 mm) and the position displacement curve is the position E2 (refer to...). Figure 12 Then, draw the imaginary line IL3 passing through positions E1 and E2 (refer to...). Figure 12 If the proportion of peaks in the position shift curve between positions E1 and E2 that are higher than the imaginary line IL3 is 50% or more, then the shape of the surface 14C of the first filling part 14 can be determined to be an upwardly convex shape. Conversely, if the proportion of peaks in the position shift curve between positions E1 and E2 that are lower than the imaginary line IL3 is 50% or more, then the shape of the first filling part 14 can be determined to be a downwardly concave shape. Furthermore, if the imaginary line IL3 overlaps with the position shift curve, it is determined to be a downwardly concave shape. In the curve diagram for determining the shape of the first filling part 14, one scale mark on the horizontal axis is set to 5 mm, and one scale mark on the vertical axis is set to 0.02 mm.

[0177] When the surface 14C of the first filling portion 14 is convex upwardly, the average distance D1 from the imaginary line IL3 to the position displacement curve in the longitudinal direction is preferably 0.003 mm or more. If the average distance D1 is 0.003 mm or more, the sheet 12 can be effectively lifted, thus further mitigating the aforementioned step difference. The lower limit of this average distance D1 is more preferably 0.01 mm or more. If the upper limit of the average distance D1 is excessively convex, it may become a cause of new step differences, so it is preferably 0.1 mm or less, more preferably 0.07 mm or less. The aforementioned average distance D1 refers to the value obtained by averaging the values ​​of 5 points after removing the maximum and minimum values, based on 7 peaks that are convex upwardly above the imaginary line IL3, with the imaginary line IL3 as the reference point. Furthermore, the peaks read are mountain-shaped, and the larger parts are selected.

[0178] The slope of the imaginary line IL3 relative to the horizontal axis of the position displacement curve is preferably 0.0020 or more and 0.0130 or less, more preferably 0.0030 or more and 0.0070 or less, and even more preferably 0.0050 or more and 0.0060 or less. If the slope is 0.0050 or more, the coating material can be filled without any depression; if it is 0.0060 or less, the coating material can be filled without any significant bulge. The lower limit of this slope is preferably 0.0020 or more, 0.0030 or more, or 0.040 or more, and the upper limit is preferably 0.0130 or less, 0.0120 or less, or 0.0100 or less.

[0179] The thickness of the first filling portion 14 preferably gradually increases from near the separation position P1 toward the end face 12A1. By varying the thickness of the first filling portion 14 in this way, the abrupt height change of the sheet 12 in the radial DR3 (normal direction) of the core 11 can be suppressed, thus mitigating the step difference caused by the winding start end 12A.

[0180] If the thickness of the first filler portion changes drastically, there is a concern that residual deformation may occur due to this thickness change, thus failing to adequately mitigate the step difference caused by the beginning of winding. Therefore, it is preferable to ensure a sufficient length of the first filler portion relative to the sheet thickness. However, in cases where increasing the length of the first filler portion causes other effects such as winding, by intentionally making the length of the first filler portion shorter than optimal, although the deformation mitigation length is longer compared to the state with the optimal length of the first filler portion, the deformation mitigation length can be shortened compared to not having a first filler portion. Therefore, in cases such as Figure 4 In the case where the first clamping portion 20 exists, it is preferable that the length L1 of the first filling portion 14 along the length direction DR2 of the sheet 12 (refer to...) Figure 4The length L2 of the first clamping part 20 along the length direction DR2 of the sheet 12 (refer to) Figure 4 The ratio of the total length L1 + length L2 to the thickness T2 of the first filling portion 14 at the position where it connects with the end face 12A1 ((length L1 + length L2) / thickness T2) is 90 or more. Furthermore, in cases such as Figure 8 In the absence of the first clamping part 20, the length L1 of the first filling part 14 along the length direction DR2 of the sheet 12 (refer to) Figure 8 The ratio (length L1 / thickness T2) of the length L1 to the thickness T2 of the first filling portion 14 at the position where it meets the end face 12A1 is preferably 90 or more. From the viewpoint of shortening the aforementioned deformation mitigation length, the lower limit of these ratios is preferably 100 or more, 110 or more, 120 or more, or 140 or more. In addition, the upper limit of these ratios is not particularly limited, and for example, it can be 1200 or less, 1000 or less, 800 or less, 500 or less, or 300 or less.

[0181] Length L1 is the length of the first filling portion 14 along the length direction DR2 of the sheet 12, from the position where it meets the end face 12A1 to the end of the separation position P1. Length L2 is the length of the sheet 12 from the position directly above the end face 12A1 along the length direction DR2 to the end of the sheet 12 where the first and second sheets of the sheet 12 meet. Lengths L1 and L2 can be calculated from the position displacement curve graph in the same way as thickness T2. Specifically, firstly, the presence of the first clamping portion is confirmed by the method described later. If the first clamping portion exists, the positions E1 and E2 are found from the position displacement curve graph. Next, an imaginary line IL4 (refer to) is drawn through the position E2 and perpendicular to the line with a displacement of 0 mm. Figure 12 Next, if the intersection of the imaginary line IL4 and the line with a displacement of 0 mm is set as position E3, the total length of length L1 and length L2 can be calculated by determining the distance between position E2 and position E3. Furthermore, in the absence of the first clamping part, the length L1 can be calculated by determining the distance between position E2 and position E3 using the above method.

[0182] From the viewpoint of mitigating the aforementioned step difference, a longer length L1 is better. For example, when the thickness of the sheet 12 is 50 μm or more and 200 μm or less, the length L1 is preferably 110 μm or more. To further shorten the aforementioned deformation mitigation length, it is preferably 1 mm or more, and more preferably 10 mm or more. However, if the length L1 is too long, it will be difficult to form an upwardly convex first filling portion during processing. In addition, wavy thickness unevenness may occur in the first filling portion. Therefore, from the viewpoint of easily obtaining an upwardly convex first filling portion 14 and suppressing wavy thickness unevenness, the upper limit of the length L1 is preferably 100 mm or less.

[0183] The above-mentioned (length L1 + length L2) / thickness T2 and length L1 / thickness T2 can roughly represent the shape of the first filling portion 14, but in order to more accurately represent the upwardly protruding convex shape of the first filling portion 14, it is preferable to further use the area of ​​the first filling portion 14 on the plane including the length direction DR2 of the sheet 12 and the radial direction DR3 of the core 11. Specifically, in such Figure 4 In the case where the first clamping part 20 exists, the area S1 of the region R11 sandwiched between the outer peripheral surface 11A of the core 11 and the surface 14C of the first filling part 14 in the plane including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the core 11 (refer to) Figure 5 ), and the area S2 of the region R12 sandwiched between the outer peripheral surface 11A of the core 11 and the surface 20A of the first clamping part 20 (refer to Figure 5 The ratio of the total area of ​​the first filling portion 14 to the thickness T2 at the position where it contacts the end face 12A1 ((area S1 + area S2) / thickness T2) is preferably 3.0 or more. Figure 5 The area S1 of region R11 represents the cross-sectional area of ​​the first filling part 14. Additionally, Figure 5 The area S2 of region R12 represents the total cross-sectional area of ​​the first clamping part 20, the cross-sectional area of ​​the sheet 12 within region R12, and the cross-sectional area of ​​the fixing member 17 within region R2. It should be noted that in... Figure 5 The diagram shows the state where the sheet 12 on the first filling portion 14 and the first clamping portion 20 is peeled off, exposing the first filling portion 14 and the first clamping portion 20. In the absence of the first clamping portion 20, the ratio of the area S1 of the region R11 sandwiched between the outer peripheral surface 11A of the core 11 and the surface 14C of the first filling portion 14 in the plane including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the core 11 to the thickness T2 of the first filling portion 14 (area S1 / thickness T2) is preferably 3.0 or more. If these ratios are 3.0 or more, the sum of area S1 and area S2 or area S1 is larger than the thickness T2, thus allowing the sheet 12 to be effectively lifted using the first filling portion 14, thereby further mitigating the aforementioned step difference. From the viewpoint of further mitigating the aforementioned step difference, the lower limit of these ratios is preferably 4.0 or more, 5.0 or more, 6.0 or more, 7.0 or more, or 8.0 or more. In addition, there is no specific upper limit to these ratios; for example, they can be below 50.0 or below 17.0.

[0184] The sum of areas S1 and S2, or area S1, can be obtained by calculating the product of the thickness at each measurement point and the width between each measurement point in the region from position E2 to position E3, and summing them up. Furthermore, the width between measurement points can be determined based on the sampling period, the rotational speed of the core, and the outer diameter of the core. Specifically, the width between measurement points can be calculated using the following formula (3). In formula (3), d (μm) is the width between measurement points, ΔT (s) is the sampling period, r (rpm) is the rotational speed of the core, φ (mm) is the outer diameter of the core, and π is pi.

[0185] d=ΔT×(r / 60)×φ×π×1000…(3)

[0186] As mentioned above, the core is often reused after the roll is used, thus requiring reprocessability. Therefore, the first filler portion 14 is preferably not bonded to the core 11. If reprocessability is good, the core becomes reusable after the roll is used. In this specification, "the core is reusable" means that, by visual inspection, there are no deposits on the entire outer periphery of the core that would cause step differences. The removal method varies depending on the coating material used for the first filler portion. In cases where the crosslinking density is high and the coating is hard, such as a hard coating used in display devices, a thinner edge thickness T1 is sometimes easier to remove. On the other hand, in cases where the crosslinking density is not very high and the coating has rubber elasticity, a thicker edge thickness T1 is sometimes easier to remove. In either case, it is sufficient to visually confirm that no deposits causing step differences remain. In addition, "bonding" in this specification includes the concept of adhesion. By preventing the first filler portion 14 from bonding to the core 11, the first filler portion 14 can be easily peeled off, thus providing good reprocessability. Regarding the first filling portion 14, it is more preferable to peel it off slowly from the core 11 by cleaning or wiping it, or by making a blade-like opening at the end of the first filling portion 14 in a manner that will not damage the core 11, using fingers or the like. Furthermore, it is more preferable that the first filling portion 14 does not substantially contain any adhesive components.

[0187] The first filling portion 14 can be formed by causing the coating material to flow or deform. If the coating material exhibits fluidity, it is not always necessary for it to exhibit fluidity as long as it does so before or during sheet winding.

[0188] The coating material is a coatable material, for example, one that is fluid during application or winding. Examples of fluid coating materials include not only liquids, but also materials that change from liquid to solid, solids that become fluid upon heating, or curing materials. In the case where the coating material is a curing material, the first filler portion 14 is formed from the cured product of the curing material.

[0189] The shear viscosity of the coating material at a shear rate of 1 / s at 25°C is preferably 500 Pa·s or less. For example, it is also possible to stretch the coating material applied to the core using a scraper or the like while adjusting the shape of the coating material before winding the sheet, but stretching the coating material in this way requires a lot of effort. In contrast, if the shear viscosity of the coating material is 500 Pa·s or less, the pressure during sheet winding can be used to stretch the coating material into the desired shape, thus eliminating the need for a special stretching process. The shear viscosity is more preferably 200 Pa·s or less. From the viewpoint of making the coating material easy to stretch, the shear viscosity is preferably 300 Pa·s or less, 100 Pa·s or less, or 50 Pa·s or less.

[0190] On the other hand, from the viewpoint of shortening the aforementioned deformation mitigation length, the aforementioned shear viscosity is preferably 10 Pa·s or more and 75 Pa·s or less, more preferably 20 Pa·s or more and 50 Pa·s or less. If the shear viscosity is 10 Pa·s or more, the fluidity will not become too high, thus mitigating the deformation of the sheet 12. In addition, if it is 75 Pa·s or less, deformation caused by the end of the first filling portion can be suppressed.

[0191] Furthermore, from the viewpoint of further suppressing the overflow of coating material, a shear viscosity of 15 Pa·s or higher, and more preferably 20 Pa·s or higher, can reduce the overflow of coating material from between the core 11 and the sheet 12 during coating, which is therefore preferable. In addition, a shear viscosity of 60 Pa·s or higher is preferred. If this shear viscosity is 60 Pa·s or higher, the fluidity of the coating material is low, which can reduce the possibility of coating material overflowing from between the core and the sheet due to pressure during coating and / or winding.

[0192] The aforementioned shear viscosity of the coating material can be measured using a dynamic viscoelasticity measuring device (e.g., manufactured by Anton-Paar Japan). Specifically, using a parallel plate with a diameter of 25 mm, the shear viscosity of the coating material is measured 10 times at a shear rate of 1 [1 / s] in an environment with a temperature of 25°C and a relative humidity of 30% to 70%. The arithmetic mean of the eight shear viscosities remaining after removing the maximum and minimum values ​​from the 10 measured shear viscosities is then calculated, thereby determining the shear viscosity.

[0193] Examples of coating materials include curable polymers, thermoplastic resins, oils, starches, adhesives, binders, or sols.

[0194] The coating material is preferably free of solvents and other volatile components. By making the coating material free of volatile components, the shape changes such as cracks in the first filling part 14 are small, and sheet marks are less likely to occur.

[0195] The coating material is preferably a material with low flowability in the roll 10 state. In this specification, "low flowability in the roll state" means that the coating material will not overflow from the roll during transport or manufacturing. When forming the first filler portion 14 in the first gap 13, it is necessary to be able to apply the coating material. However, if the coating material has high flowability in the roll 10 state, the first filler portion may overflow and cause contamination during transport or manufacturing. In contrast, if the coating material is a material that can be applied when forming the first filler portion 14 and has low flowability in the roll 10 state, the first filler portion 14 can be formed in the first gap 13, and overflow or contamination of the first filler portion 14 can be suppressed. Examples of such materials that can be applied when forming the first filler portion but have low flowability in the roll 10 state include curable polymer compositions.

[0196] When the coating material is a curable polymer composition, the coating material can be, for example, ionizing radiation-curable polymer compositions (ionizing radiation-curable resin compositions, ionizing radiation-curable rubber compositions), thermosetting polymer compositions (thermosetting resin compositions, thermosetting rubber compositions), room temperature curable polymer compositions (polymer compositions that cure at room temperature of about 20°C to 30°C) (room temperature curable resin compositions, room temperature curable rubber compositions), etc.

[0197] Among room-temperature curable polymer compositions, there are, for example, two-component curable polymer compositions consisting of a main agent and a curing agent, and one-component curable polymer compositions that cure using moisture in the air. The portion of the first filler section located in the center of the sheet is essentially sealed when the sheet is wound up, making it difficult for air to contact this portion and potentially preventing sufficient curing. In contrast, with two-component curable polymer compositions, the reaction begins when the main agent and curing agent are mixed, allowing curing to be achieved simply through time management. Furthermore, two-component curable polymer compositions are preferred for their superior storage stability compared to one-component curable polymer compositions.

[0198] Examples of compositions that can be cured by ionizing radiation include those containing compounds with olefinic unsaturated groups such as (meth)acryloyl, vinyl, and allyl. Examples of ionizing radiation irradiated during the curing of these compositions include visible light, ultraviolet light, X-rays, electron beams, alpha rays, beta rays, and gamma rays.

[0199] Examples of thermosetting and room-temperature curing polymer compositions include polyurethane resin compositions, epoxy resin compositions, and silicone compositions. Silicone compositions are preferred. Examples of silicone compositions include silicone gel compositions and silicone rubber compositions, both of which readily mitigate the aforementioned gradient differences and deformation.

[0200] In this specification, "cured silicone gel (silicone gel)" refers to a cured product with a very low crosslinking density, primarily composed of organopolysiloxane, and specifically a cured product with a penetration of 10 to 150 based on JIS K2220:2013 (1 / 4 cone). This corresponds to a low hardness (i.e., softness) in rubber hardness measurements based on JIS K6249:2003, where the measured value (rubber hardness value) is 0, indicating a lack of effective rubber hardness. In this respect, it differs from so-called silicone rubber compositions and cured silicone rubber products (rubber-like elastomers).

[0201] Silicone rubber compositions include single-component curable silicone rubber compositions and two-component curable silicone rubber compositions. Single-component curable silicone rubber compositions include condensation-reaction curable rubber compositions that cure at room temperature and addition-reaction curable rubber compositions that cure by heating. Two-component curable silicone rubber compositions include condensation-reaction curable rubber compositions that cure at room temperature, addition-reaction rubber compositions, and addition-reaction rubber compositions that cure by heating. Furthermore, ionizing radiation-curable rubber compositions can be formed by modifying other resins in the silicone rubber composition. In this invention, any curing method can be used, but from the viewpoint of achieving uniform curing and maintaining excellent stability, two-component curable silicone rubber compositions are preferred.

[0202] Examples of silicone rubber compositions include RTV (Room Temperature Vulcanizing) silicone rubber compositions. Compared to ionizing radiation-curable polymer compositions, RTV silicone rubber compositions exhibit lower shrinkage and better dimensional stability. Furthermore, they possess excellent flowability before curing, allowing them to easily penetrate the gaps between the core 11 and the sheet 12, or between the sheet 12. After curing, they exhibit low flowability. Moreover, this RTV silicone rubber composition possesses deep curing properties, enabling it to cure uniformly regardless of the coating thickness. Additionally, this composition has excellent release properties, allowing the cured material to be easily peeled off, resulting in a state where it can be reused as a roll.

[0203] Among the aforementioned RTV silicone rubber compositions, based on the curing reaction mechanism, there are condensation reaction-cured RTV silicone rubber compositions, addition reaction-cured RTV silicone rubber compositions, etc. Both are preferably used in this invention. Condensation reaction-cured RTV silicone rubber compositions are preferred because they do not hinder curing, while addition reaction-cured RTV silicone rubber compositions are preferred because they have lower curing shrinkage. In this invention, there is a tendency that the greater the curing shrinkage of the material, the greater the thickness of the coating material required to mitigate the aforementioned step difference. Therefore, especially for thin sheets (e.g., the thickness of sheet 12 is 3 μm to 45 μm), addition reaction-cured RTV silicone rubber compositions are preferred.

[0204] Regarding the aforementioned RTV silicone rubber composition, considering factors such as the lack of need for special processing equipment, liquid silicone rubber (LSR) is preferred.

[0205] It should be noted that, in order to achieve the desired function, functional components may be included in the various compositions described above. For example, silicone rubber compositions are typically electrical insulators, and therefore may become charged due to contact with the core 11, sheet 12, or other materials. In such cases, the silicone rubber composition may contain conductive fillers. This prevents the ingress of foreign matter such as dust, thus suppressing its role as a cause of the aforementioned gradient difference.

[0206] Examples of conductive fillers incorporated into silicone rubber compositions include carbon black (acetylene black, Ketjen black), silver powder, gold-plated silica, graphite, and conductive zinc oxide. Additionally, ionically conductive silicone rubbers have been developed in recent years and can also be used.

[0207] In the above-described organosilicon gel composition, any components may be mixed without prejudice to the purpose of the present invention. Examples of such arbitrary components include reaction inhibitors, inorganic fillers, organopolysiloxanes that do not contain silicon atoms bonded to hydrogen atoms or silicon atoms bonded to alkenyl groups, heat-resistant agents, flame-retardant agents, thixotropic agents, pigments, dyes, etc.

[0208] Reaction inhibitors are components used to inhibit the reaction of the above-mentioned components. Specifically, examples include acetylene-based, amine-based, carboxylic acid ester-based, and phosphite-based reaction inhibitors.

[0209] Examples of inorganic fillers include: fumed silica, crystalline silica, precipitated silica, hollow fillers, silsesquioxanes, fumed titanium dioxide, magnesium oxide, zinc oxide, iron oxide, aluminum hydroxide, magnesium carbonate, calcium carbonate, zinc carbonate, stratified mica, carbon black, diatomaceous earth, and glass fiber; and fillers obtained by surface hydrophobication treatment of these fillers with organosilicon compounds, such as organoalkoxysilane compounds, organochlorosilane compounds, organosilazane compounds, and low molecular weight siloxane compounds. Additionally, organosilicon rubber powder and organosilicon resin powder can also be blended.

[0210] In order to prevent the coating material from flowing excessively, and on the other hand, to allow the coating material to flow to the vicinity of the position (separation position) P1 where the sheet 12 of the first week separates from the outer peripheral surface 11A of the core 11, it is preferable to appropriately adjust the viscosity of the coating material during coating.

[0211] The coating material is applied in a linear pattern, but the amount of coating material applied per unit width is preferably an amount sufficient to achieve thicknesses T1 to T3 within the aforementioned range of the first filling portion 14. Specifically, for example, the lower limit of the amount of coating material applied per unit width is preferably 0.2 cm. 3 / m or more. If the above-mentioned coating amount of the coating material is too small, air may be mixed in, for example, when applying with a syringe. In cases where it is difficult to eject the coating material from the syringe, or when applying the coating while moving the sheet, insufficient coating may occur. However, if the above-mentioned coating amount is 0.2cm... 3 A thickness of / m or more can suppress this situation. Furthermore, the upper limit of the coating material coverage per unit width is preferably 3.5cm. 3 / m or less. If the above-mentioned amount of coating material is applied in excess, the coating material may drip due to its own weight or create new step differences. However, if the above-mentioned amount of coating material is 3.5cm, 3 At a depth of / m or less, this condition can be suppressed. The lower limit of the above-mentioned coating amount is more preferably 0.3cm. 3 / m or more, and more preferably, the upper limit of the above-mentioned coating amount is 2.0cm. 3 / m or less or 1.5cm 3 / m or less.

[0212] <Second Filling Section>

[0213] The second filling portion 16 fills the second gap 15. That is, Figure 3 The second filling portion 16 shown is in contact with the outer peripheral surface 11A of the core 11, the back surface 12C of the sheet 12, and the first end surface 17A of the fixing member 17. In addition, a small gap may exist between the second filling portion 16 and the first end surface 17A.

[0214] The second filler portion 16 is composed of a coating material, or, if the coating material is a curable polymer composition, its cured form. This coating material is the same as the coating material described in the first filler portion 14, therefore its description is omitted. The coating material may be the same as the coating material described in the first filler portion 14, but it may also be different.

[0215] The thickness of the second filling portion 16 preferably gradually decreases from the first end face 17A toward the position P2 near the outer peripheral surface 11A of the core 11 towards the first periphery of the sheet 12. By varying the thickness of the second filling portion 16 in this way, abrupt changes in the height direction of the sheet 12 can be suppressed, thus mitigating the step difference caused by the fixing member 17.

[0216] <First Clamping Section>

[0217] Since the first filler portion tends to be softer than the sheet material, if the height of the first filler portion at the position where it contacts the end face of the winding start end is the same as the height of the upper surface of the winding start end, a step difference may occur at the corner between the end face of the winding start end and the upper surface when the sheet material is wound. In contrast, when the first clamping portion 20 is formed, the first clamping portion 20 can absorb the difference in hardness between the first filler portion 14 and the sheet material 12, thereby reducing the step difference at the corner between the end face 12A1 and the upper surface 12A2 of the winding start end 12A. In addition, by having the first clamping portion 20, stress concentration at the step difference caused by the winding start end 12A can be suppressed, and the deformation of the sheet material 12 after the third turn can be smoothed out, thus mitigating the step difference.

[0218] The first clamping portion 20 preferably includes coloring material and luminescent material in the same way as the first filling portion 14. By including coloring material and luminescent material in the first clamping portion 20, it is easily identifiable by visual inspection when the first clamping portion 20 overflows from the roll body 10. Furthermore, the presence of the first clamping portion 20 is easily confirmed. The coloring material and luminescent material included in the first clamping portion 20 are the same as those described in the section on the first filling portion 14, therefore, their description is omitted.

[0219] When the sheet 12 is transparent and the first clamping portion 20 is colored, the presence of the first clamping portion 20 can be easily confirmed by visual inspection. Specifically, firstly, the sheet 12 is fed from the roll 10 until the surface of the sheet 12 becomes the second loop. Then, in the roll 10 where the second loop of the sheet 12 becomes the surface, the vicinity of the winding start end 12A is visually observed to see if there is a colored portion on the winding start end 12A. If there is a colored portion on the winding start end 12A, it can be determined that the first clamping portion 20 exists; otherwise, if there is no colored portion, it can be determined that the first clamping portion 20 does not exist.

[0220] Even when the sheet 12 is transparent and the first clamping portion 20 contains a luminescent material, the presence of the first clamping portion 20 can be easily confirmed by visual inspection, just as described above. In the case where the luminescent material is a material that emits light when exposed to ultraviolet light, visible light, or similar illumination, the presence of the first clamping portion 20 can be confirmed by irradiating it with light.

[0221] When the thickness of sheet 12 is 50 μm or more and 200 μm or less, the thickness T3 of the first clamping part 20 (refer to) Figure 4 The thickness T3 of the first clamping portion 20 is preferably 2 μm or more and 110 μm or less. If the thickness T3 of the first clamping portion 20 is within this range, it is possible to avoid adverse effects on the winding of the sheet 12 and to shorten the aforementioned deformation mitigation length. It should be noted that even if the thickness T3 of the first clamping portion 20 exceeds 110 μm, the aforementioned deformation mitigation length can still be shortened, but it may have an adverse effect on the winding of the sheet 12.

[0222] When the thickness of sheet 12 is 3 μm or more but less than 50 μm, and further less than 40 μm, sheet 12 is more prone to deformation due to the step difference caused by the winding start end 12A compared to when sheet 12 is thicker. Therefore, the thickness T3 of the first clamping portion 20 is preferably 0.5 μm or more but less than 50 μm. If the thickness T3 of the first clamping portion 20 is within this range, it is possible to avoid adverse effects on the winding of sheet 12, and at the same time, the aforementioned deformation mitigation length can be shortened.

[0223] The thickness T3 of the first clamping portion 20 is taken as the maximum thickness of the first clamping portion 20. The thickness T3 of the first clamping portion 20 is measured as follows: First, the portion including the winding start end 12A, the first clamping portion 20, and the sheet 12 of the second circumference is selected and fixed in such a way that it is not crushed. Then, the cross-section of the fixed portion is ground, and the thickness T3 of the first clamping portion 20 is measured using a solid microscope (for example, the product name is "Digital Microscope VHX-7000", manufactured by KEYENCE Co., Ltd.).

[0224] The first clamping part 20 is made of a coating material, or, if the coating material is a curable polymer composition, its cured form. This coating material is the same as the coating material described in the first filling part 14, therefore its description is omitted. The coating material may be the same as the coating material described in the first filling part 14, but it may also be different.

[0225] <First Exposure Suppression Component>

[0226] The first exposure suppression member 18 is a member for suppressing the end 14A of the first filling portion 14 in the width direction DR1 of the core 11 from being exposed to the outside of the sheet 12. In this embodiment, the first exposure suppression member 18 is a member for suppressing the end 14A of the first filling portion 14 from overflowing to the outside of the sheet 12. That is, the first exposure suppression member 18 functions as a blocking member to prevent the end 14A of the first filling portion 14 from overflowing to the outside of the sheet 12.

[0227] To prevent the end 14A of the first filling portion 14 from overflowing outwards from the sheet 12, such as Figure 2 As shown, the first exposure suppression member 18 is located on the outer side of the end 14A of the first filling portion 14 in the width direction DR1, and is covered by the sheet 12. The first exposure suppression member 18 is disposed on the outer peripheral surface 11A of the core 11.

[0228] like Figure 2 As shown, the first exposure suppression member 18 is located on both sides of the first filling portion 14 in the width direction DR1. As a result, the end portion 14A of the first filling portion 14 can be suppressed from overflowing outward of the sheet 12.

[0229] If the first exposure suppression component exists in the effective area, then in the width direction of the core, a portion of the sheet will be present in the effective area where the first filling portion is absent, potentially resulting in a portion where the step difference cannot be effectively mitigated. Therefore, if Figure 2 As shown, preferably, the first exposure suppression component 18 is not present in the effective region R1, but is located in the ineffective region R2.

[0230] If the first filling portion 14 comes into contact with the first exposure suppressing member 18 under pressure during the winding of the sheet 12, the first filling portion 14 tends to move along the first exposure suppressing member 18. Therefore, if the length of the first exposure suppressing member in the circumferential direction of the core is short, the first filling portion may overflow around the first exposure suppressing member. Therefore, it is preferable that the first exposure suppressing member 18 is along the circumferential direction DR4 of the core 11 (refer to...). Figure 7 )extend.

[0231] When viewing volume 10 from above (see reference) Figure 2 If there is a gap between the end face of the first exposure suppressing member on the winding start end side and the winding start end and fixing member, although the first exposure suppressing member can generally suppress the overflow of the end of the first filling portion, the end of the first filling portion may slightly overflow from the gap to the outside of the sheet. In contrast, if... Figure 2 and Figure 6By having a portion of the first exposure suppression member 18 overlap the winding start end 12A, it is difficult to form the aforementioned gap. Therefore, it is possible to further suppress the overflow of the end 14A of the first filling portion 14 to the outside of the sheet 12, and it is also possible to suppress the overflow of the end of the first clamping portion 20 to the outside of the sheet 12. Furthermore, the first exposure suppression member 18 may be configured such that the end face of the first exposure suppression member 18 on the winding start end 12A side contacts the end face 12A1 of the winding start end 12A and the second end face 17B of the fixing member 17. However, from the viewpoint that it is difficult to form the aforementioned gap even with changes over time, and from the viewpoint of suppressing the overflow of the end of the first clamping portion 20, it is preferable to configure the first exposure suppression member 18 such that a portion of the first exposure suppression member 18 overlaps the winding start end 12A.

[0232] Preferably, the length L3 of the first exposure suppression member 18 on the circumferential DR4 of the core 11 (refer to...) Figure 7 The length L3 of the first filling portion 14 is greater than the maximum length of the first filling portion 14 in the circumferential direction DR4. This prevents the first filling portion 14 from overflowing to the outside of the sheet 12 by bypassing the first exposure suppressing member 18. The length L3 of the first exposure suppressing member 18 is preferably 10 mm or more. If the length L3 of the first exposure suppressing member 18 is 10 mm or more, the situation where the first filling portion 14 bypasses the first exposure suppressing member 18 can be further suppressed. From the viewpoint of further suppressing the situation where the first filling portion 14 bypasses the first exposure suppressing member 18, the lower limit of the length L3 of the first exposure suppressing member 18 is more preferably 30 mm or more, 50 mm or more, 60 mm or more, or 90 mm or more. From the viewpoint of suppressing the overlap of the first exposure suppressing members 18, the upper limit of the length L3 of the first exposure suppressing member 18 is preferably less than the outer perimeter of the core 11, for example, it can be a length obtained by subtracting 10 mm from the outer perimeter (mm) of the core 11. If the length L3 of the first exposure suppression member 18 is less than or equal to the length obtained by subtracting 10 mm from the outer perimeter (mm) of the core 11, then the overlap of the first exposure suppression members 18 can be reliably suppressed, thus suppressing the step difference caused by the overlap of the first exposure suppression members 18. The length of the first exposure suppression member in the circumferential direction of the core can be determined as follows: the length of the first exposure suppression member in the circumferential direction of the core is measured at 10 locations, and the arithmetic mean of the 8 lengths after removing the maximum and minimum values ​​from the 10 measured lengths is obtained.

[0233] The width W4 of the first exposed suppressing member 18 in the width direction DR1 of the core 11 (refer to...) Figure 7The width W4 of the first exposure suppressing member 18 is preferably 1 mm or more. If the width W4 of the first exposure suppressing member 18 is 1 mm or more, then even if the first filling portion 14 crosses the first exposure suppressing member 18 as described later, the first filling portion 14 will stop at the first exposure suppressing member 18, thereby suppressing overflow. From the viewpoint of further suppressing the overflow of the first filling portion 14, the lower limit of the width W4 of the first exposure suppressing member 18 is more preferably 5 mm or more, 10 mm or more, or 30 mm or more. From the viewpoint of reducing the step difference marks caused by the first exposure suppressing member 18, the upper limit of the width W4 of the first exposure suppressing member 18 can be 50 mm or less, 20 mm or less, or 5 mm or less. The width of the first exposure suppressing member in the width direction of the core can be determined by measuring the width of the first exposure suppressing member at 10 locations and calculating the arithmetic mean of the widths at the 8 locations after removing the maximum and minimum values ​​from the 10 measured widths.

[0234] If the thickness of the first exposure suppressing member is thin, the first filling portion may overflow beyond the first exposure suppressing member. Therefore, the thickness T4 of the first exposure suppressing member 18 at the position where it contacts the end face 12A1 (refer to...) Figure 6 Preferably, the thickness T2 of the first filling portion 14 at the position where it connects with the end face 12A1 (refer to...) Figure 4 That is, the overflow of the first filling portion 14 beyond the first exposure suppression member 18 can be suppressed.

[0235] The thickness T4 of the first exposure suppression member 18 at the position where it contacts the end face 12A1 is preferably 50 μm or more and 5000 μm or less. If the thickness T4 of the first exposure suppression member 18 is 50 μm or more, the situation where the first filling portion 14 crosses the first exposure suppression member 18 can be further suppressed. In addition, if the thickness T4 of the first exposure suppression member 18 is 5000 μm or less, the generation of a new step difference caused by the first exposure suppression member 18 can be suppressed. From the viewpoint of being able to further suppress the situation where the first filling portion 14 crosses the first exposure suppression member 18, the lower limit of the thickness T4 of the first exposure suppression member 18 is more preferably 100 μm or more, 300 μm or more, or 500 μm or more. From the viewpoint of further suppressing the generation of a new step difference caused by the first exposure suppression member 18, the upper limit of the thickness T4 of the first exposure suppression member 18 is more preferably 3000 μm or less, 2000 μm or less, or 1000 μm or less.

[0236] Preferably, the energy storage modulus of the first exposure suppression member 18 at 25°C is lower than that of the first filler portion 14 at 25°C. If the energy storage modulus of the first exposure suppression member is high, a gap may be generated between the first exposure suppression member and the core near the beginning of winding, and the first filler portion may flow out from this gap. However, if the energy storage modulus of the first exposure suppression member 18 is lower than that of the first filler portion 14, the outflow of the first filler portion 14 can be suppressed.

[0237] The energy storage modulus of the first exposure suppression member 18 at 25°C is preferably 0.001 MPa or more and 5 MPa or less. If the energy storage modulus of the first exposure suppression member 18 is 0.001 MPa or more, the outflow of the first exposure suppression member 18 can be further suppressed. In addition, if the energy storage modulus of the first exposure suppression member 18 at 25°C is 5 MPa or less, the generation of a gap between the first exposure suppression member 18 and the core 11 near the winding start end 12A can be suppressed. The lower limit of the energy storage modulus of the first exposure suppression member 18 is preferably 0.001 MPa or more, 0.005 MPa or more, or 0.01 MPa or more. The upper limit of the energy storage modulus of the first exposure suppression member 18 is preferably 3 MPa or less, 1 MPa or less, or 0.5 MPa or less.

[0238] The storage modulus of the first exposure suppression member 18 at 25°C can be measured using a dynamic viscoelastic measuring device (e.g., manufactured by Anton-Paar Japan). Specifically, firstly, a sample with a diameter of 10 mm is cut from the first exposure suppression member. If it is not possible to cut a sample with a diameter of 10 mm from the first exposure suppression member, a sample with a diameter of 10 mm is made using the same material constituting the first exposure suppression member. Then, this sample is fixed on a parallel plate with a diameter of 8 mm, and the storage modulus at a vibration frequency of 1 [rad / s] is measured using a dynamic viscoelastic measuring device at an environment of 25°C and a relative humidity of 30% to 70%. The storage modulus of the first filling portion 14 can also be measured in the same manner as the storage modulus of the first exposure suppression member 18.

[0239] Preferably, the density of the first exposure suppressing member 18 at 25°C is higher than the density of the first filling portion 14 at 25°C. If the density of the first exposure suppressing member is low, the first filling portion may leak out from the first exposure suppressing member, but if the density of the first exposure suppressing member 18 is lower than the density of the first filling portion 14, the leakage of the first filling portion 14 can be suppressed.

[0240] Preferably, the density of the first exposure suppression component 18 at 25°C is 0.01 g / cm³. 3The above. If the density of the first exposure suppression component 18 at 25°C is 0.01 g / cm³. 3 The above measures can suppress the leakage of the first filling portion 14 from the first exposure suppression member 18. The lower limit of the density of the first exposure suppression member 18 at 25°C is more preferably 0.03 g / cm³. 3 Above, 0.05g / cm 3 Above or 0.1g / cm 3 That's all. From the viewpoint of preventing the first exposure suppression member 18 from becoming the deformation starting point of the sheet 12, the upper limit of the density of the first exposure suppression member 18 at 25°C can be 0.5 g / cm³. 3 Below, 0.4g / cm 3 Below, or 0.3g / cm 3 the following.

[0241] The density of the first exposure suppression component 18 at 23°C can be measured as follows: First, a 1cm × 1cm sample is cut from the first exposure suppression component. If a sample of the aforementioned size cannot be cut from the first exposure suppression component, a 1cm × 1cm sample is obtained using the same material constituting the first exposure suppression component. Then, the mass and thickness of the sample are measured at an environment of 23°C and a relative humidity of 30% to 70%, and the density is calculated from mass (g) / thickness (cm). The density of the first filling portion 14 at 23°C can also be measured in the same manner as the density of the first exposure suppression component 18.

[0242] Figure 2 The first exposure suppression member 18 shown is provided on each side of the first filling portion 14, but two or more may be provided on each side. By providing two or more first exposure suppression members 18 on each side, it is possible to further suppress the first filling portion 14 from passing over the first exposure suppression member 18.

[0243] Regarding the material of the first exposure suppression member 18, there is no particular limitation as long as it does not adversely affect the sheet material. Examples include resin, metal, rubber, gel, tape (including cushioning tape), clay, or paper. Using these materials facilitates operation and / or installation. Among these, resin or tape is preferred from the viewpoint of facilitating operation and installation. Furthermore, when rubber or gel is used as the material of the first exposure suppression member 18, the first exposure suppression member 18 itself can deform, thus suppressing the generation of new step differences caused by the first exposure suppression member 18.

[0244] The resin can be a thermoplastic resin or a cured product of a curable resin composition. When the resin is a cured product of a curable resin composition, the shape can be freely changed before the curable resin composition is cured, thus suppressing the generation of new step differences caused by the first exposure suppression member 18.

[0245] The thermoplastic resin is not particularly limited, and examples include polyolefins (such as polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, polyurethane, ABS resin, and acrylic resins. Among these, polyurethane is preferred from the viewpoint of having a higher exposure suppression effect. Polyurethane can be any form, such as a gel or a foam.

[0246] Examples of curable resin compositions include: ionizing radiation-curable resin compositions that are cured using ultraviolet light or electron beams; thermosetting resin compositions; room temperature-curable resin compositions that are cured at approximately 20°C to 30°C; catalyst-curable resin compositions that are cured using a catalyst; and anaerobic-curable resin compositions. Ionizing radiation-curable resin compositions require irradiation with ultraviolet light or electron beams after application; therefore, from the viewpoint of facilitating curing, thermosetting resin compositions, catalyst-curable resin compositions, and anaerobic-curable resin compositions are preferred.

[0247] The tape can be any of the following: tape with adhesive on both sides, tape with adhesive on only one side, or tape without adhesive. When the tape has adhesive on both sides or only one side, the adhesive can be applied not only to the entire surface but also partially. From the viewpoint of suppressing contamination of the sheet 12, a tape without adhesive is preferred; however, in this case, the process becomes slightly more difficult because the tape without adhesive needs to be sandwiched between the core and the sheet of the first cycle. Therefore, it is preferable to apply adhesive only partially.

[0248] Sheets are used for optical applications, for example, so for paper, paper that does not easily produce paper dust, such as cleaning paper, is preferred.

[0249] <Second Exposed Suppression Component>

[0250] The second exposure suppression member 19 is a member for suppressing the end 16A of the second filler portion 16 from being exposed to the outside of the sheet 12 in the width direction DR1 of the core 11. In this embodiment, the second exposure suppression member 19 is a member for suppressing the end 16A of the second filler portion 16 from overflowing to the outside of the sheet 12. That is, the second exposure suppression member 19 functions as a blocking member to prevent the end 16A of the second filler portion 16 from overflowing.

[0251] To prevent the end 16A of the second filling portion 16 from overflowing outwards from the sheet 12, such as Figure 2 As shown, the second exposure suppression member 19 is located on the outer side of the end 16A of the second filling portion 16 in the width direction DR1, and is covered by the sheet 12.

[0252] Figure 2 The second exposure suppression member 19 shown is located on both sides of the second filling portion 16 in the width direction DR1. As a result, the end portion 16A of the second filling portion 16 can be suppressed from overflowing outward of the sheet 12.

[0253] For the same reasons stated in the column for the first exposure suppression member 18, the second exposure suppression member 19 is preferably not present in the effective region R1, but is located in the ineffective region R2. For the same reasons stated in the column for the first exposure suppression member 18, the second exposure suppression member 19 preferably extends along the circumferential direction DR4 of the core 11.

[0254] When viewing volume 10 from above (see reference) Figure 2 If there is a gap between the end face of the second exposure suppressing member on the fixing member side and the first end face of the fixing member, although the second exposure suppressing member can generally suppress the overflow of the end of the second filling portion, there is a possibility that the end of the second filling portion may slightly overflow from the gap to the outside of the sheet. In contrast, as... Figure 2 and Figure 6 As shown, if a portion of the second exposure suppressing member 19 overlaps the fixing member 17, the aforementioned gap is difficult to form, thus further suppressing the overflow of the end 16A of the second filling portion 16 to the outside of the sheet 12. Furthermore, the second exposure suppressing member 19 may be configured such that the end face of the second exposure suppressing member 19 on the fixing member 17 side contacts the first end face 17A of the fixing member 17. However, from the viewpoint that the aforementioned gap is difficult to form even with changes over time, it is preferable that a portion of the second exposure suppressing member 19 overlaps the fixing member 17.

[0255] Preferably, the length L4 of the second exposure suppression member 19 on the circumferential DR4 of the core 11 (refer to...) Figure 7 The length of the second filling portion 16 is greater than the maximum length of the second filling portion 16 in the circumferential direction DR4. This prevents the second filling portion 16 from overflowing around the second exposure suppressing member 19. Furthermore, since the second gap 15 is smaller than the first gap 13, the second filling portion 16 is less likely to overflow than the first filling portion 14. Therefore, the length L4 of the second exposure suppressing member 19 can also be shorter than the length L3 of the first exposure suppressing member 18.

[0256] The length L4 of the second exposure suppressing member 19 is preferably 1 mm or more. If the length L4 of the second exposure suppressing member 19 is 1 mm or more, the situation where the second filling portion 16 bypasses the second exposure suppressing member 19 can be further suppressed. From the viewpoint of further suppressing the situation where the second filling portion 16 bypasses the second exposure suppressing member 19, the lower limit of the length L4 of the second exposure suppressing member 19 is more preferably 5 mm or more, 10 mm or more, or 50 mm or more. From the viewpoint of suppressing the second exposure suppressing members 19 from overlapping each other, the upper limit of the length L4 of the second exposure suppressing member 19 is preferably less than the outer perimeter of the core 11, for example, it can be less than or equal to the length obtained by subtracting 10 mm from the outer perimeter (mm) of the core 11. If the length L4 of the second exposure suppressing member 19 is less than or equal to the length obtained by subtracting 10 mm from the outer perimeter (mm) of the core 11, the overlap of the second exposure suppressing members 19 can be reliably suppressed, and thus the step difference caused by the overlap of the second exposure suppressing members 19 can be suppressed. The length of the second exposure suppression component in the circumferential direction of the core can be determined as follows: Measure the length of the second exposure suppression component in the circumferential direction of the core at 10 points, and calculate the arithmetic mean of the 8 lengths after removing the maximum and minimum values ​​from the 10 measured lengths.

[0257] Regarding the width W5 of the second exposure suppression member 19 in the width direction DR1 of the core 11 (refer to...) Figure 7 For the same reasons stated in the section on the first exposure suppressing member 18, the width is preferably 1 mm or more. From the viewpoint of further suppressing the overflow of the second filling portion 16, the lower limit of the width W5 of the second exposure suppressing member 19 is more preferably 5 mm or more, 10 mm or more, or 20 mm or more. If the width W5 of the second exposure suppressing member 19 is large, it may cause the second exposure suppressing member 19 to enter the effective area R1, which may result in a step difference due to the influence of the second exposure suppressing member 19 itself. However, even if the width W5 of the second exposure suppressing member 19 is large, as long as the second exposure suppressing member 19 is exposed on the outside of the sheet 12 in a way that the second exposure suppressing member 19 does not enter the effective area R1, the step difference caused by the second exposure suppressing member 19 can be suppressed. In addition, by exposing the second exposure suppressing member 19 on the outside of the sheet 12, the overflow of the second filling portion 16 can be further suppressed. Therefore, the upper limit of the width W5 of the second exposure suppressing member 19 can be 35 mm or less, 30 mm or less, or 25 mm or less. The width of the first exposed suppressing component can be determined as follows: measure the width of the second exposed suppressing component at 10 locations, and calculate the arithmetic mean of the widths at the 8 locations after removing the maximum and minimum values ​​from the 10 measured widths.

[0258] For the same reasons stated in the section on the first exposure suppression member 18, the thickness of the second exposure suppression member 19 is preferably greater than or equal to the thickness of the second filling portion 16. The thickness of the second exposure suppression member 19 is preferably 5 μm or more and 5000 μm or less. If the thickness of the second exposure suppression member 19 is 5 μm or more, the situation where the second filling portion 16 extends beyond the second exposure suppression member 19 can be further suppressed. Furthermore, if the thickness of the second exposure suppression member 19 is 5000 μm or less, the generation of new step differences caused by the second exposure suppression member 19 can be suppressed. From the viewpoint of further suppressing the second filling portion 16 from extending beyond the second exposure suppression member 19, the lower limit of the thickness of the second exposure suppression member 19 is more preferably 10 μm or more, 50 μm or more, or 100 μm or more. From the viewpoint of further suppressing the generation of new step differences caused by the second exposure suppression member 19, the upper limit of the thickness of the second exposure suppression member 19 is more preferably 3000 μm or less, 2000 μm or less, or 1000 μm or less. The thickness of the second exposure suppression member can be determined as follows: the thickness of the second exposure suppression member is measured at 10 locations, and the arithmetic mean of the thicknesses at the 8 locations after removing the maximum and minimum values ​​is calculated.

[0259] For the same reasons as those stated in the column for the first exposure suppression member 18, the energy storage modulus of the second exposure suppression member 19 at 25°C is preferably less than or equal to the energy storage modulus of the second filling portion 16 at 25°C.

[0260] The storage modulus of the second exposure suppression member 19 at 25°C is preferably 0.001 MPa or more and 5 MPa or less. If the storage modulus of the second exposure suppression member 19 is 0.001 MPa or more, leakage of the second exposure suppression member 19 can be suppressed. Furthermore, if the storage modulus of the second exposure suppression member 19 is 5 MPa or less, gaps between the second exposure suppression member 19 and the core 11 near the winding start end 12A can be suppressed. The lower limit of the storage modulus of the second exposure suppression member 19 at 25°C is preferably 0.003 MPa or more, 0.005 MPa or more, or 0.01 MPa or more. The upper limit of the storage modulus of the second exposure suppression member 19 at 25°C is preferably 3 MPa or less, 1 MPa or less, or 0.5 MPa or less. The storage modulus of the second exposure suppression member and the second filling portion at 25°C can be measured using the same method as the storage modulus of the first exposure suppression member.

[0261] For the same reasons as those stated in the column for the first exposure suppression member 18, the density of the second exposure suppression member 19 at 25°C is preferably higher than or equal to the density of the second filling portion 16 at 25°C.

[0262] Preferably, the density of the second exposure-suppressing component 19 at 25°C is 0.01 g / cm³. 3 That's all. If the density of the second exposed suppressing component 19 is 0.01 g / cm³, then... 3 The above can prevent the second filling portion 16 from seeping out of the second exposure suppressing member 19. Furthermore, if the density of the second exposure suppressing member 19 is 0.01 g / cm³... 3 The above measures can suppress deformation of the second exposure suppression member 19 caused by winding pressure, thereby preventing the overflow of the second filling portion 16. The lower limit of the density of the second exposure suppression member 19 at 23°C is more preferably 0.03 g / cm³. 3 Above, 0.05g / cm 3 Above or 0.1g / cm 3 That concludes the discussion. Based on the viewpoint that suppressing the second exposure suppression component 19 becomes the starting point of deformation, the upper limit of the density of the second exposure suppression component 19 at 25°C can be 0.5 g / cm³. 3 Below, 0.4g / cm 3 Below, or 0.3g / cm 3 The following measurements can be taken. The densities of the second exposure-suppressing component and the second filling portion at 25°C can be measured using the same method as the density of the first exposure-suppressing component.

[0263] The material used to construct the second exposure suppression member 19 is not particularly limited as long as it does not adversely affect the sheet. For example, the same material as the first exposure suppression member 18 can be listed.

[0264] <<Another Volume>>

[0265] In the roll 10, the end face 12A1 of the winding start end 12A of the sheet 12 and the second end face 17B of the fixing member 17 are approximately aligned on the radial DR3 of the core 11, but they can also be aligned as follows: Figure 13 As shown in the roll 50, the end face 12A1 of the winding start end 12A of the sheet 12 protrudes beyond the second end face 17B of the fixing member 17. In this case, the second filling portion 16 may be filled in the second gap 15 and located between the outer peripheral surface 11A of the core 11 and the back surface 12C of the first circumference of the sheet 12, the third filling portion 52 may be filled in the third gap 51 on the side of the second end face 17B, and the third exposure suppressing member 53 may be provided outside the third filling portion 52 in the width direction DR1 of the core 11 (see reference). Figure 14 ).

[0266] <Third Interval>

[0267] The third gap 51 is the gap between the fixed member 17 and the second end face 17B. Specifically, Figure 13The third gap 51 shown is a gap surrounded by the outer peripheral surface 11A of the core 11, the back surface 12C of the first sheet 12, and the second end face 17B of the fixing member 17.

[0268] <Part 3>

[0269] The third filling part 52 is the same as the second filling part 16 except that it fills the third gap 51, so the description is omitted here.

[0270] <Third Exposed Suppression Component>

[0271] The third exposure suppression member 53 is the same as the second exposure suppression member 19 except that it is provided on the outside of the third filling portion 52 in the width direction DR1 of the core 11, so its description is omitted here.

[0272] In the roll 10, the second filling portion 16 is filled in the second gap 15. However, from the viewpoint of mitigating the step difference caused by the winding start end 12A of the sheet 12, it is sufficient to fill the first filling portion 14 in the first gap 13. Therefore, it is also possible to... Figure 15 As shown in the roll 60, the second filling portion 16 is not filled in the second gap 15. The second gap 15 of the roll 60 becomes an empty space. In this case, since the second gap 15 of the roll 60 becomes an empty space, the second filling portion will not overflow. Therefore, as... Figure 16 As shown, there is no need to set a second exposure suppression component 19.

[0273] In the roll body 10, the first filling portion 14 is filled in the first gap 13, but from the viewpoint of mitigating the step difference caused by the fixing member 17, it is sufficient to fill the second gap 15 with the second filling portion 16. Therefore, it is also possible to... Figure 17 As shown in the roll 70, the first filling portion 14 is not filled in the first gap 13. The first gap 13 of the roll 70 becomes empty. In this case, since the first gap 13 of the roll 60 becomes empty, the first filling portion will not overflow. Therefore, as... Figure 18 As shown, there is no need to set the first exposure suppression component 18.

[0274] The roll body 10 has one fixing part 17, but it can also be like... Figure 19 It has two or more fixing parts as shown. Figure 19 In the roll 80 shown, in addition to the fixing member 17, a fixing member 81 is also provided on the first end face 17A side of the fixing member 17. Figure 19In the roll 80 shown, the end face 12A1 of the winding start end 12A of the sheet 12 protrudes beyond the second end face 17B of the fixing member 17. Therefore, in order to suppress the step difference caused by the fixing member 17, it is preferable to fill the second gap 15 with a second filling portion 16 and the third gap 51 with a third filling portion 52. In this case, it is preferable to provide a third exposure suppression member 53 (see reference) on the outside of the third filling portion 52 in the width direction DR1 of the core 11. Figure 20 ).

[0275] Furthermore, similarly, in Figure 19 In the shown roll body 80, to suppress the step difference caused by the fixing member 81, it is preferable that a second filling portion 83 is filled in the second gap 82 on the side of the first end face 81A of the fixing member 81 (described later), and a third filling portion 85 is filled in the third gap 84 on the side of the second end face 81B of the fixing member 81 (described later). In this case, it is preferable that a second exposure suppression member 86 is provided outside the second filling portion 83 in the width direction DR1 of the core 11 (see reference). Figure 20 Additionally, a third exposure suppression member 87 is provided on the outer side of the third filling portion 85 (see reference). Figure 20 ).

[0276] <Fixed components>

[0277] The fixing member 81 has a first end face 81A and a second end face 81B opposite to the first end face 81. Both the first end face 81A and the second end face 81B extend along the width direction DR1 of the core 11. The second end face 81B is located closer to the winding start end 12A than the first end face 81A. The fixing member 81 is the same as the fixing member 17, so its description is omitted here.

[0278] <Second Gap>

[0279] The second gap 82 is the gap between the first end face 81A of the fixing member 81 and the fixing member 81. Specifically, Figure 19 The second gap 82 shown is a gap surrounded by the outer peripheral surface 11A of the core 11, the back surface 12C of the first sheet 12, and the first end face 81A of the fixing member 81.

[0280] <Third Interval>

[0281] The third gap 84 is the gap between the fixed member 81 and the second end face 81B. Specifically, Figure 19 The third gap 84 shown is a gap surrounded by the outer peripheral surface 11A of the core 11, the back surface 12C of the first sheet 12, and the second end face 81B of the fixing member 81.

[0282] <Second and Third Filling Sections>

[0283] The second filling part 83 is the same as the second filling part 16 except that it is filled in the second gap 82, so its description is omitted here. The third filling part 85 is the same as the second filling part 16 except that it is filled in the third gap 84, so its description is omitted here.

[0284] <Second exposure suppression component and third exposure suppression component>

[0285] The second exposure suppression member 86 is the same as the second exposure suppression member 19, except that it is located outside the second filling portion 83 in the width direction DR1 of the core 11, so its description is omitted here. The third exposure suppression member 87 is the same as the second exposure suppression member 19, except that it is located outside the third filling portion 85 in the width direction DR1 of the core 11, so its description is omitted here.

[0286] The roll body 10 has a fixing component 17, but it can also be like... Figure 21 and Figure 22 The roll shown in Figure 90 does not have a fixing component 17.

[0287] exist Figure 13 , Figure 15 , Figure 19 , Figure 21 In the figure, length L1, length L2, thickness T2, thickness T3, area S1, and area S2 are not shown, but in volumes 50, 60, 80, and 90, the lengths L1 to L4, thicknesses T2 to T4, (length L1+L2) / thickness T2, and (area S1+S2) / thickness T2 are the same as in volume 10.

[0288] All scrolls 50, 60, 80, and 90 are equipped with the first clamping part 20, but they can also be combined with... Figure 8 The scroll 30 shown also does not have a first clamping part.

[0289] exist Figure 15 In the middle, the entire surface of the fixing member 17 is in close contact with the winding start end 12A, but it can also be in close contact with... Figure 9 Similarly, the first filling portion 14 or the first exposure suppression member 18 of the roll 40 shown is inserted between the winding start end 12A and the fixing member 17.

[0290] In rolls 10, 50, 60, 80, and 90, the first exposure suppression member 18 is disposed on the outer peripheral surface 11A of the core 11, but it can also be as follows: Figure 23 , Figure 24 The first exposure suppression member 101 is positioned on the side of the sheet 12 as shown. Figure 23 , Figure 24In the roll 100 shown, the first exposure suppression member 101 is located outside the end 14A of the first filling portion 14 in the width direction DR1 and is covered by the sheet 12. However, it is not disposed on the outer peripheral surface 11A of the core 11, but on the back surface 12C of the sheet 12. Specifically, on the back surface 12C of the sheet 12, side strips extending along the length direction DR2 are attached to both ends in the width direction (width direction DR1 of the core 11), and a portion of these side strips constitutes the first exposure suppression member 101. Since both ends of the sheet 12 exist within the non-effective area R2, there is no problem with the product even with such side strips attached. The side strips are not particularly limited; for example, side strips for optical films can be cited.

[0291] exist Figure 23 , Figure 25 In the roll 100 shown, the second exposure suppression member 102 is located outside the end 16A of the second filling portion 16 in the width direction DR1, and is covered by the sheet 12, but is not disposed on the outer peripheral surface 11A of the core 11, but on the back surface 12C of the sheet 12. The second exposure suppression member 102 is also part of the side tape.

[0292] Regarding the first exposure suppression member 101 and the second exposure suppression member 102, they can also be formed by coating instead of the side strip. When the first exposure suppression member 101 and the second exposure suppression member 102 are formed by coating, they can also be made of the same material as the material constituting the first exposure suppression member 18 and the second exposure suppression member 19.

[0293] In the roll body 10, the second gap 15 is filled with a second filling portion 16, but it can also be as follows: Figure 27 As shown in the roll 110, the second filling portion 16 is not filled in the second gap 15, making the second gap 15 an empty space. A second clamping portion 111 is provided in at least the region 12D corresponding to the second gap 15 between the sheets 12 after the first turn. In this case, it is preferable to provide an exposure suppression member 112 (see reference) on the outer side of the end 111A of the second clamping portion 111 in the width direction DR1 of the core 11. Figure 26 ).

[0294] <Second clamping section>

[0295] The second clamping portion 111 is provided between the sheets 12 after the first cycle. Therefore, the sheet 12 must be present on the second clamping portion 111. The second clamping portion 111 extends along the width direction DR1 of the core 11.

[0296] The maximum thickness T5 of the second clamping part 111 (refer to) Figure 28The maximum thickness T5 is preferably 0.01 mm or more. If the maximum thickness T5 of the second clamping portion 111 is 0.01 mm or more, the step difference caused by the fixing member 17 can be effectively mitigated. From the viewpoint of more effectively mitigating the aforementioned step difference, the maximum thickness T5 is more preferably 0.02 mm or more, 0.03 mm or more, or 0.04 mm or more. On the other hand, if the maximum thickness T5 is too thick, although the step difference caused by the fixing member can be mitigated, it may sometimes have an adverse effect on the winding of the sheet 12. Therefore, the upper limit of the maximum thickness T5 is preferably 0.2 mm or less or 0.1 mm or less. The maximum thickness T5 of the second clamping portion 111 can be measured using a laser displacement gauge, a solid microscope, and the same method as for thickness T2.

[0297] When measuring the thickness of the second clamping portion 111 along the length direction DR2 of the sheet 12, the length L5 along the length direction DR2 from the end 111B of the second clamping portion 111 to the position where the maximum thickness T5 of the second clamping portion 111 is reached (refer to...). Figure 28 The ratio (length L5 / maximum thickness T5) of the length L5 to the maximum thickness T5 of the second clamping portion 111 is preferably 12 or more. If this ratio is 12 or more, residual deformation near the end 111B of the second clamping portion 111 can be suppressed. Furthermore, if the thickness of the second clamping portion is too thick, the roll may detach from the circle during winding, resulting in poor winding performance. However, if the ratio is 12 or more, the second clamping portion 111 will not be too thick, thus suppressing poor winding performance. Additionally, if the thickness of the second clamping portion is too thick, new deformation caused by the second clamping portion may occur. However, if the ratio is 12 or more, such new deformation can be suppressed. From the viewpoint of shortening the aforementioned deformation mitigation length, the lower limit of this ratio is preferably 25 or more, 50 or more, 75 or more, 100 or more, 125 or more, 150 or more, 175 or more, or 200 or more. From the viewpoint of effectively mitigating the step difference caused by the aforementioned fixing components, the greater the maximum thickness T5 of the second clamping part 111, the better. Therefore, the upper limit of this ratio is preferably 2000 or less, 1000 or less, 500 or less, or 375 or less.

[0298] From the viewpoint of mitigating the aforementioned step difference, the longer the length L5, the better. For example, when the thickness of the sheet 12 is 50 μm or more and 200 μm or less, the length L5 is preferably 5.0 mm or more. To further shorten the aforementioned deformation mitigation length, it is more preferably 7.0 mm or more, and even more preferably 9.0 mm or more. However, if the length L5 is too long, in terms of processing, the region R3 (refer to) from the end 111B of the second clamping portion 111 to the position where the maximum thickness T5 is reached... Figure 28In the second clamping part, it is difficult to form a convex surface. In addition, wavy thickness unevenness may occur in the second clamping part. Therefore, from the viewpoint that the surface 111C of the second clamping part 111 in region R3 is easy to become convex and to suppress wavy thickness unevenness, the upper limit of the length L5 is preferably 20 mm or less.

[0299] The length L5 can be calculated using the same method as the maximum thickness T5, based on the position displacement curve. Specifically, firstly, if the end 111B of the second clamping part 111 exists, the displacement increases. Therefore, the first position is the intersection of the line where the displacement begins to increase (0 mm) with the position displacement curve. Next, an imaginary line is drawn that passes through the position with the highest displacement and is perpendicular to the line with the 0 mm displacement. Then, the intersection of this imaginary line and the line with the 0 mm displacement is taken as the second position. The distance between the first and second positions is calculated, and the length L5 can be determined from this distance.

[0300] The aforementioned length L5 / maximum thickness T5 can roughly represent the shape of the second clamping portion 111, but to more accurately represent the convex shape of the surface 111C, it is preferable to further use the cross-sectional area of ​​the second clamping portion 111. Specifically, it is preferable to include the plane containing the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the core 11. Figure 28 The cross-sectional area S3 of the second clamping portion 111 in the plane shown, from the end 111B to the position where the maximum thickness T5 is reached (refer to the plane shown). Figure 28 The ratio of the cross-sectional area S3 to the maximum thickness T5 of the second clamping portion 111 (cross-sectional area S3 / maximum thickness T5) is 2.5 or more. If this ratio is 2.5 or more, the cross-sectional area S3 of the second clamping portion 111 is larger than the maximum thickness T5, so the sheet 12 can be effectively lifted by the second clamping portion 111, thereby further mitigating the aforementioned step difference. From the viewpoint of further mitigating the aforementioned step difference, the lower limit of the cross-sectional area S3 / maximum thickness T5 is preferably 3.0 or more, 3.5 or more, 4.0 or more, 5.0 or more, 5.5 or more, 6.0 or more, 6.5 or more, or 7.0 or more. In addition, the upper limit of the cross-sectional area S3 / maximum thickness T5 is not particularly limited, for example, it can be 20.0 or less, 17.5 or less, 15.0 or less, or 12.5 or less, or 10.0 or less. The cross-sectional area S3 is the cross-sectional area of ​​the region R3 of the second clamping portion 111 (in Figure 28 In the middle, the cross-sectional area of ​​the region enclosed by the solid line in the second clamping part 111 can be obtained by calculating the product of the thickness at each measurement point in the region from the first position to the second position and the width between each measurement point in the graph of the position displacement curve, and summing them up.

[0301] The material of the second clamping part 111 is the same as that of the second filling part 16, so the description is omitted here.

[0302] <Exposed suppression components>

[0303] The exposure suppression member 112 is a component that integrates a first exposure suppression member for suppressing the exposure of the end 14A of the first filling part 14 and a second exposure suppression member for suppressing the exposure of the end 111A of the second clamping part 111. Figure 29 The first part 112A of the exposure suppression member 112 shown is the same as the first exposure suppression member 18, so its description is omitted here. Figure 29 The second portion 112B of the exposure suppression member 112 shown, which corresponds to the second exposure suppression member, is the region 12D (see reference) between the sheets 12 where the second clamping portion 111 is provided, which corresponds to at least the second gap 15. Figure 29 Except for the outer side of the end 111A of the second clamping portion 111 located in the width direction DR1 of the core 11, it is the same as the second exposure suppression member 19, so its description is omitted here. Furthermore, the exposure suppression member 112 can also be divided into a first exposure suppression member that suppresses the exposure of the end 14A of the first filling portion 14, and a second exposure suppression member that suppresses the exposure of the end 111A of the second clamping portion 111.

[0304] <<Manufacturing Method of Scroll>>

[0305] Volume 10 can be manufactured, for example, by the following methods. Figures 30-33 This diagram schematically illustrates the manufacturing process of the roll body according to this embodiment. First, as... Figure 30 As shown in (A), a fixing member 17 is disposed on the outer peripheral surface 11A of the core 11 along the width direction DR1 of the core 11.

[0306] After configuring the fixing component 17, as follows Figure 30 As shown in (B), second exposure suppression members 19 are respectively arranged along the circumferential direction DR4 of the core 11 at positions corresponding to the non-effective area R2 of the sheet 12 on the outer peripheral surface 11A of the core 11. The second exposure suppression members 19 are arranged such that a portion of the second exposure suppression member 19 overlaps with the fixing member 17. Furthermore, the second exposure suppression members 19 may also be arranged to contact the first end face 17A of the fixing member 17. Alternatively, the second exposure suppression members 19 can be arranged by application using a dispensing device, syringe, or other application apparatus, or by attaching the sheet or tape.

[0307] After the second exposure suppression component 19 is configured, an application device such as a dispenser or syringe is used. Figure 31As shown in (A), coating material 201 is applied to the outer peripheral surface 11A of the core 11 along the width direction DR1 between the second exposed suppressing members 19. The coating material 201 is applied in a manner that contacts the first end face 17A of the fixing member 17. Alternatively, the coating material 201 may be applied in a manner that approaches the first end face 17A of the fixing member 17.

[0308] After applying coating material 201, as follows Figure 31 As shown in (B), the winding start end 12A is arranged such that the sheet 12 covers the coating material 201. Specifically, the winding start end 12A of the sheet 12 is attached to the fixing member 17, and the winding start end 12A is fixed to the outer peripheral surface 11A of the core 11 via the fixing member 17.

[0309] After fixing the starting end 12A of the sheet 12 to the fixing member 17, as follows Figure 32 As shown in (A), first exposure suppression members 18 are respectively disposed along the circumferential direction DR4 of the core 11 at positions corresponding to the ineffective area R2 of the sheet 12 on the outer peripheral surface 11A of the core 11. The first exposure suppression members 18 are disposed not only at the position forming the first gap 13, but also at the position on the winding start end 12A. The first exposure suppression members 18 can be disposed by applying with a dispensing device such as a dispenser or syringe, or by attaching the sheet or tape.

[0310] After forming or configuring the first exposure-inhibiting component 18, an application device such as a dispenser or syringe is used. Figure 32 As shown in (B), at a position on the outer peripheral surface 11A of the core 11 corresponding to the effective area R1 of the sheet 12 between the first exposed suppressing members 18, a coating material 202 is applied along the width direction DR1 of the core 11. The coating material 202 is applied in a manner that contacts the second end face 17B of the fixing member 17. Alternatively, the coating material 202 may be applied in a manner that approaches the second end face 17B of the fixing member 17.

[0311] Then, as Figure 33 As shown, sheet 12 is wound along the outer peripheral surface 11A of core 11. During winding of sheet 12, coating materials 201 and 202 flow and expand, thus coating material 202 fills the first gap 13 and coating material 201 fills the second gap 15, thereby forming a first filling portion 14 filling the first gap 13 and a second filling portion 16 filling the second gap 15. This yields roll 10. Furthermore, in order to reliably expand and fill the first gap 13 with coating material 202, etc., if sheet 12 exceeds 1000m, it is preferable to wind sheet 12 to 1000m or more; otherwise, if sheet 12 is less than 1000m, it is preferable to wind the entire length of sheet 12.

[0312] Furthermore, when the coating materials 201 and 202 are curable polymer compositions, the curable polymer composition is cured after the sheet 12 has been wound at least twice. When the curable polymer composition is a one-component curable polymer composition (a moisture-curing polymer composition), the composition cures by reacting with humidity in the air and being placed at room temperature; therefore, it can be cured without the use of special devices such as heating devices or ionizing radiation irradiation devices. Furthermore, when the curable polymer composition is a two-component curable polymer composition, it can be cured by mixing the main agent and the curing agent.

[0313] In the above manufacturing methods, the coating materials 201 and 202 are flowed by winding the sheet 12. However, the coating materials 201 and 202 can also be flowed in advance before winding the sheet 12. However, if the coating materials 201 and 202 are flowed in advance before winding the sheet 12, the number of steps increases. Therefore, it is preferable to flow the coating materials 201 and 202 by winding the sheet 12.

[0314] In the above description, coating material 202 is applied after coating material 201 is applied. However, for example, two coating devices may be used to apply coating materials 201 and 202 simultaneously.

[0315] In the above description, coating material 201 is applied in contact with the first end face 17A, and coating material 202 is applied in contact with the second end face 17B. However, if the coating material has high wettability and low viscosity, applying it in contact with either the first or second end face may result in the coating material being impregnated between the starting end of the winding and the fixing member, and the wetting extending to the area between the starting end of the winding and the back side of the sheet. Controlling the coating material can be a preferred state, but excessive impregnation or wetting extension can lead to curing in uncontrollable locations, sometimes resulting in new step differences. Furthermore, when the viscosity of the coating material is high (e.g., in strip form) or the wettability of the coating material is low, there is a higher possibility that the coating material or coating application material will cure only in the vicinity of the application site. Therefore, if the material is not sufficiently wetted and spread during subsequent winding processes, more material will cure in a thicker state near the winding start end, which may lead to a larger step difference. Therefore, it is preferable that the coating material 201 is applied close to the first end face 17A of the fixing member 17, and it is also preferable that the coating material 202 is applied close to the second end face 17B of the fixing member 17. In this specification, "close" means a position that is significantly separated from the winding start end or the fixing member. For example, even if the coating material is a low-viscosity material, the separation distance from the winding start end or the fixing member is preferably 0.3 mm or more. This separation distance is preferably 0.5 mm or more, and from the viewpoint of maximizing its stability, it is preferably 1 mm or more. Furthermore, if the separation distance is too large, it will be difficult to achieve the effect of mitigating the step difference. Therefore, it is preferable to achieve a separation distance that is sufficient to complete the desired effect. Figure 3 The distance is adjusted within the range of the first filling portion 14, etc. For example, the upper limit of this separation distance is preferably 10 mm or less, 7 mm or less, and more preferably 5 mm or less. Furthermore, when the viscosity of the coating material is low, the coating amount can be increased. The separation distance is determined by measuring 10 separation distances and calculating the arithmetic mean of the 8 separation distances after removing the maximum and minimum values ​​from the 10 measured separation distances.

[0316] When the viscosity of the coating material is high, the coating material is difficult to spread. Therefore, it is preferable that the separation distance is relatively short. When the viscosity of the coating material is low, if the separation distance is too small, there is a concern that a large amount of coating material will remain on the fixed part. In addition, if the separation distance is too large, there is a concern that the material will not be able to fully fill the target gap due to spreading in other directions. Therefore, it is preferable that the separation distance is neither too small nor too large.

[0317] In the above description, after the fixing member 17 is placed on the outer peripheral surface 11A of the core 11, the coating material 201 is applied in contact with the first end face 17A of the fixing member 17, and then the coating material 202 is applied in contact with the second end face 17B of the fixing member 17. However, the application of the coating material 201 and 202 and the placement of the fixing member 17 can also be performed in the order of the manufacturing methods (1) to (3) described below. Among them, the manufacturing method (2) described below is preferred.

[0318] The manufacturing method (1) is as follows: after the fixing member 17 is disposed on the outer peripheral surface 11A of the core 11, the coating material 201 is applied in such a way that the separation distance is formed on the first end face 17A side of the fixing member 17, and then the coating material 202 is applied in such a way that the separation distance is formed on the second end face 17B side of the fixing member 17.

[0319] The manufacturing method (2) is as follows: after applying the coating material 201 to the outer peripheral surface 11A of the core 11, the fixing member 17 is arranged such that the distance from the coating material 201 is the separation distance mentioned above. Then, the coating material 202 is applied to the side of the fixing member 17 opposite to the coating material 201 such that the distance from the fixing member 17 is the separation distance mentioned above. Alternatively, after applying the coating material 202 to the outer peripheral surface 11A of the core 11, the fixing member 17 is arranged such that the distance from the coating material 202 is the separation distance mentioned above. Then, the coating material 201 is applied to the side of the fixing member 17 opposite to the coating material 202 such that the distance from the fixing member 17 is the separation distance mentioned above. By applying the coating materials 201 and 202 and configuring the fixing component 17 in this order, it is possible to stably configure the components with a separation distance, suppress the application of excess coating materials 201 and 202 on the fixing component 17, and thus suppress the generation of new step differences on the fixing component 17.

[0320] The manufacturing method (3) is as follows: coating materials 201 and 202 are applied to the outer peripheral surface 11A of the core 11 at a predetermined interval, and then a fixing member 17 is arranged between the coating materials 201 and 202.

[0321] In production Figure 26In the case of the roll 110 shown, firstly, after the sheet 12 is fixed to the fixing member 17, an exposure suppression member is arranged from the position on the outer peripheral surface 11A of the core 11 corresponding to the ineffective area R2 of the sheet 12 to the ineffective area R2 of the sheet 12 along the circumferential direction DR4 of the core 11. The exposure suppression member 112 is arranged such that a portion of the exposure suppression member 112 overlaps the fixing member 17. In addition, the exposure suppression member 112 can be arranged by applying it using a dispensing device such as a syringe, or by attaching the sheet or tape. Then, a coating material 201 is applied between the exposure suppression members 112 and in at least the area corresponding to the second gap 15 in the effective area R1 of the sheet 12 along the width direction DR1 of the core 11. In addition, a coating material 202 is applied between the exposure suppression members 112 in such a way that it contacts the second end face 17B of the fixing member 17. Then, the sheet 12 is wound to form the first filling portion 14 and the second clamping portion 111.

[0322] According to this embodiment, since the first filling portion 14 is filled in the first gap 13, a portion of the first ring of the sheet 12 on the first filling portion 14 can be gently lifted from the separation position P1 toward the top surface 12A1. This mitigates the step difference caused by the winding start end 12A of the sheet 12.

[0323] According to this embodiment, since the second filling portion 16 is filled in the second gap 15, the portion of the first ring of sheet 12 on the second filling portion 16 can descend smoothly from the first end face 17A toward the arrival position P2. This effectively mitigates the step difference caused by the fixing member 17.

[0324] In the roll 30, since the third filling portion 32 is filled in the third gap 31, the portion of the first ring of sheet 12 on the third filling portion 32 can be lifted smoothly. As a result, the step difference caused by the fixing member 17 can be mitigated more effectively.

[0325] If the sheet material deforms, there will be portions within it that cannot be used as a product. Therefore, to ensure the effective length, compensation is made for the effective length of the sheet material. That is, if the portion of the sheet material that cannot be used as a product becomes longer due to deformation, the sheet material waste increases. In contrast, according to this embodiment, since the step difference caused by the winding start end 12A of the sheet material 12 and the step difference caused by the fixing members 17 and 81 can be mitigated, deformation of the sheet material 12 can be suppressed. As a result, sheet material waste can be reduced.

[0326] According to this embodiment, a first exposure suppression member 18, 101 is disposed on the outer side of the first filling portion 14 in the width direction DR1 of the core 11, thereby suppressing the first filling portion 14 from overflowing to the outer side of the sheet 12 and suppressing the end portion 14A of the first filling portion 14 from being exposed to the outer side of the sheet 12. As a result, the sheet 12 can be prevented from being contaminated.

[0327] According to this embodiment, since the second exposure suppression members 19 and 102 are disposed on the outer side of the second filling portion 16 in the width direction DR1 of the core 11, the overflow of the second filling portion 16 to the outer side of the sheet 12 can be suppressed, thereby suppressing the end portion 16A of the second filling portion 16 from being exposed to the outer side of the sheet 12. As a result, the sheet 12 can be prevented from being contaminated.

[0328] According to this embodiment, in the roll 110, an exposure suppression member 112 is disposed on the outer side of the first filling portion 14 and the outer side of the second clamping portion 111 in the width direction DR1 of the core 11. Therefore, the overflow of the first filling portion 14 and the second clamping portion 111 to the outer side of the sheet 12 can be suppressed, thereby suppressing the end 14A of the first filling portion 14 and the end 111A of the second clamping portion 111 from being exposed to the outer side of the sheet 12. As a result, the sheet 12 can be prevented from being contaminated.

[0329] [Second Implementation]

[0330] Hereinafter, the contents of the second embodiment of this disclosure will be described with reference to the accompanying drawings. Figure 34 This is a perspective view of the scroll body of this embodiment. Figure 35 yes Figure 34 A top view of the scroll. Figure 36 It is Figure 35 An enlarged view of a portion of the cross-section of line VII-VII in the volume. Figure 37 It is Figure 35 An enlarged view of a portion of the cross-section of line VIII-VIII in the volume. Figure 38 It is Figure 34 An enlarged top view of a portion of the scroll. Figure 39 This is an enlarged view of a portion of another volume of this embodiment. Figure 40 This is a top view of another volume of this embodiment. Figure 41 It is Figure 40 A magnified view of a portion of the cross-section of line IX-IX in the volume. Figure 42 It is Figure 40 An enlarged view of a portion of the cross-section of the XX line in the scroll. Figure 43 It is Figure 40 An enlarged view of a portion of the cross section of the XI-XI line in the scroll.

[0331] <<<Roll>>>

[0332] Figure 34 and Figure 35 The roll 120 shown includes a core 11 and a strip-shaped sheet 12 wound around the outer peripheral surface 11A of the core 11. For example... Figure 36 As shown, the roll body 120 includes: a first filling portion 14 that fills a first gap 13 located between the core 11 and the sheet 12; a second filling portion 16 that fills a second gap 15 located between the core 11 and the sheet 12; and a fixing member 17 for fixing a portion of the sheet 12 to the core 11. Additionally, as... Figure 35 and Figure 38 As shown, it also includes: a pair of first exposure suppression members 121, which suppress the end 14A of the first filling portion 14 in the width direction DR1 of the core 11 from being exposed to the outside of the sheet 12; and a pair of second exposure suppression members 122, which suppress the end 16A of the second filling portion 16 in the width direction DR1 of the core 11 from being exposed to the outside of the sheet 12.

[0333] The sheet 12 is wound multiple times on the core 11, for example, more than two times. The roll 120 may or may not have both of the first exposure suppressing member 121 and the second exposure suppressing member 122. Furthermore, although the roll 120 has a pair of first exposure suppressing members 121, it is sufficient to have at least one first exposure suppressing member 121 on one side. Similarly, although the roll 120 has a pair of second exposure suppressing members 122, it is sufficient to have at least one second exposure suppressing member 122 on one side.

[0334] In addition, the roll 120 also has a first clamping portion 20 which is continuously disposed with the first filling portion 14 and is located between the first sheet 12 and the second sheet 12. Although the roll 120 has the first clamping portion 20, it may also not have the first clamping portion.

[0335] <First Exposure Suppression Component>

[0336] The first exposure suppression member 121, like in the first embodiment, is a member used to suppress the end 14A of the first filling portion 14 from being exposed to the outside of the sheet, but... Figure 37 and Figure 38 The first exposure suppression member 121 shown is a member that suppresses the end 14A of the first filling portion 14 from overflowing from the sheet 12 from being exposed. That is, as Figure 37 As shown, the first exposure suppression member 121 functions as a covering member that covers the overflow end 14A of the first filling portion 14. From the viewpoint of covering the end 14A, the first exposure suppression member 121 is sheet-like.

[0337] Regarding the first exposure suppressing member 121, it may be entirely exposed from the sheet 12, or it may be partially covered by the sheet 12. By covering a portion of the first exposure suppressing member 121 with the sheet 12, the first exposure suppressing member 121 is fixed, thereby suppressing positional displacement of the first exposure suppressing member 121.

[0338] Preferably, the size of the exposed portion 121A of the first exposure suppression member 121 protruding from the sheet 12 is larger than the size of the overflowing end 14A of the first filling portion 14. Therefore, the exposed portion 121A can cover the entire end 14A, thus further suppressing contamination of the sheet 12.

[0339] In order not to hinder the easing of the step difference achieved based on the first filling portion 14, the non-exposed portion 121B of the first exposure suppression member 121 covered by the sheet 12 is preferably located in the ineffective region R2.

[0340] For the same reasons stated in the column for the first exposure suppression member 18, the first exposure suppression member 121 is preferably as follows: Figure 35 As shown, it is configured such that a portion of the first exposure suppression member 121 overlaps with the fixing member 17.

[0341] The exposed portion 121A has a length L6 on the circumferential DR4 of the core 11 (refer to...). Figure 38 The length L6 of the exposed portion 121A also depends on the length of the overflowing end 14A on the circumferential DR4 of the core 11, but is preferably 10 mm or more, for example. If the length L6 of the exposed portion 121A is 10 mm or more, it can cover the entire length of the end 14A on the circumferential DR4 of the core 11. The lower limit of the length L6 of the exposed portion 121A is more preferably 20 mm or more, 50 mm or more, or 100 mm or more. The upper limit of the length L6 of the exposed portion 121A can be, for example, less than half the length obtained by subtracting 10 mm from the outer perimeter (mm) of the core 11.

[0342] The exposed portion 121A has a width W6 in the width direction DR1 of the core 11 (refer to...). Figure 38 The width W6 also depends on the length of the overflowing end 14A in the width direction DR1 of the core 11, but is preferably 5 mm or more, for example. If the width W6 of the exposed portion 121A is 5 mm or more, it can cover the entire length of the overflowing end 14A in the width direction DR1 of the core 11. The width W6 of the exposed portion 121A is more preferably 10 mm or more, 30 mm or more, or 50 mm or more. From the viewpoint of suppressing concerns about contamination, the upper limit of the width W6 of the exposed portion 121A can be 40 mm or less, 30 mm or less, or 20 mm or less.

[0343] The thickness of the first exposure suppression member 121 is preferably 1 μm or more and 2000 μm or less. If the thickness of the first exposure suppression member 121 is 1 μm or more, deformation such as breakage and bending of the first exposure suppression member 121 can be suppressed, and the end portion 14A can be stably covered. Furthermore, if the thickness of the first exposure suppression member 121 is 2000 μm or less, even in situations such as… Figure 38 When the non-exposed portion 121B is arranged as shown, the generation of new step differences caused by the first exposure suppression member 121 can also be suppressed. From the viewpoint that the first exposure suppression member 121 will not break or deform, thereby more stably covering the end portion 14A, the lower limit of the thickness of the first exposure suppression member 121 is more preferably 3 μm or more, 5 μm or more, or 10 μm or more. From the viewpoint of further suppressing the generation of new step differences caused by the first exposure suppression member 121, the upper limit of the thickness of the first exposure suppression member 121 is more preferably 1000 μm or less, 500 μm or less, or 200 μm or less.

[0344] Regarding the constituent material of the first exposure suppression member 121, there is no particular limitation as long as it is a sheet-like material that does not contaminate the sheet. Examples include resin, metal, rubber, gel, tape (including cushioning tape), clay, or paper. Using these materials facilitates operation and / or installation. Among these, tape is preferred from the perspective of facilitating operation and installation. Furthermore, when rubber or gel is used as the constituent material of the first exposure suppression member 121, the first exposure suppression member 121 itself can deform, thus suppressing the generation of new step differences caused by the first exposure suppression member 121.

[0345] <Second Exposed Suppression Component>

[0346] The second exposure suppression member 122, like in the first embodiment, is a member used to suppress the end 16A of the second filling portion 16 from being exposed to the outside of the sheet, but... Figure 37 and Figure 38 The second exposure suppression member 122 shown is a member that suppresses the end 16A of the second filling portion 16 from overflowing from the sheet 12 from being exposed. That is, as Figure 37 As shown, the second exposure suppression member 122 functions as a covering member that covers the overflow end 16A of the second filling portion 16.

[0347] Regarding the second exposure suppressing member 122, for the same reasons as those stated in the section on the first exposure suppressing member 121, the second exposure suppressing member 122 may be entirely exposed from the sheet 12, or it may be partially covered by the sheet 12.

[0348] The size of the exposed portion 122A of the second exposure suppression member 122, which protrudes from the sheet 12, is preferably larger than the size of the overflowing end 16A of the second filling portion 16. Therefore, the exposed portion 122A can cover the entire end 16A, thus further suppressing contamination of the sheet 12.

[0349] In order not to hinder the easing of the step difference achieved based on the second filling portion 16, the non-exposed portion 122B of the second exposure suppression member 122 covered by the sheet 12 is preferably located in the ineffective region R2.

[0350] From the viewpoint of the entire covered end 16A, the second exposure suppression member 122 is preferably sheet-like.

[0351] For the same reasons as those stated in the section on second exposure suppression member 19, the second exposure suppression member 122 is preferably as follows: Figure 35 As shown, it is configured such that a portion of the second exposure suppression member 122 overlaps with the fixing member 17. Figure 35 The first exposure suppression component 121 and the second exposure suppression component 122 shown are separate units, but they can also be arranged as follows: Figure 39 The first exposure suppression component and the second exposure suppression component are integrated as shown in the exposure suppression component 123. In this case, the exposure suppression component 123 has not only the function of the first exposure suppression component, but also the function of the second exposure suppression component.

[0352] The exposed portion 122A has a length L7 on the circumferential DR4 of the core 11 (refer to...). Figure 38 The length also depends on the width of the overflowing end 16A on the circumferential DR4 of the core 11, but is preferably 10 mm or more, for example. If the length L7 of the exposed portion 122A is 10 mm or more, it can cover the entire length of the end 16A on the circumferential DR4 of the core 11. The lower limit of the length L7 of the exposed portion 122A is more preferably 20 mm or more, 50 mm or more, or 100 mm or more. The upper limit of the length L7 of the exposed portion 122A can be, for example, less than half the length obtained by subtracting 10 mm from the outer perimeter (mm) of the core 11.

[0353] The exposed portion 122A has a width W7 in the width direction DR1 of the core 11 (refer to...). Figure 38The width W7 of the exposed portion 122A also depends on the length of the overflowing end 16A in the width direction DR1 of the core 11, but is preferably 5 mm or more, for example. If the width W7 of the exposed portion 122A is 5 mm or more, it can cover the entire length of the overflowing end 16A in the width direction DR1 of the core 11. The width W7 of the exposed portion 122A is more preferably 10 mm or more, 30 mm or more, or 50 mm or more. From the viewpoint of suppressing concerns about contamination, the upper limit of the width W7 of the exposed portion 122A can be 40 mm or less, 30 mm or less, or 20 mm or less.

[0354] The thickness of the second exposure suppression member 122 is the same as the thickness of the first exposure suppression member 121, so the description is omitted here.

[0355] The material used to construct the second exposure suppression member 122 is the same as that used to construct the first exposure suppression member 121, so the description is omitted here.

[0356] <<Another Volume>>

[0357] The roll body 120 is filled with a second filling portion 16 in the second gap 15, but it can also be like... Figure 41 As shown in the roll 130, the second filling portion 16 is not filled in the second gap 15, making the second gap 15 an empty space. A second clamping portion 131 is provided in at least the region 12D corresponding to the second gap 15 between the sheets 12 after the first turn. In this case, it is preferable to provide an exposure suppression member 132 (see reference) on the outer side of the end 131A of the second clamping portion 131 in the width direction DR1 of the core 11. Figure 40 ).

[0358] <<Second Interlocking Section>>

[0359] The second clamping part 131 is the same as the second clamping part 111, so the description is omitted here.

[0360] <Exposed suppression components>

[0361] Figure 40 The exposure suppression member 132 shown is an integral part of a first exposure suppression member that suppresses the exposure of the end 14A of the first filling part 14 and a second exposure suppression member that suppresses the exposure of the end 131A of the second clamping part 131. Figure 42 The first portion 132A of the exposure suppression member 132 shown is the same as the first exposure suppression member 121, and therefore its description is omitted here. Regarding... Figure 42 The second portion 132B of the exposure suppression member 132 shown corresponds to the second exposure suppression member, and is disposed in the region 12D (see reference) between the sheets 12 provided with the second clamping portion 131, which corresponds to at least the second gap 15. Figure 42The second clamping portion 131 is located on the outer side of the end 131A of the second clamping portion 131 in the width direction DR1 of the core 11, and is otherwise the same as the second exposure suppression member 122, so its description is omitted here. Furthermore, as... Figure 43 As shown, preferably, the side of the end 14A of the first filling portion 14 or the side of the end 131A of the second clamping portion 131 is covered by the exposure suppression member 132.

[0362] <<Manufacturing Method of Scroll>>

[0363] Volume 120 can be manufactured, for example, by the following methods. Figure 44 and Figure 45 A diagram illustrating the manufacturing process of the roll body according to this embodiment is provided. First, as... Figure 44 As shown in (A), a fixing member 17 is disposed on the outer peripheral surface 11A of the core 11 along the width direction DR1 of the core 11.

[0364] After configuring the fixed component 17, use a distributor, such as... Figure 44 As shown in (B), coating materials 201 and 202 are applied to the outer peripheral surface 11A of the core 11 along the width direction DR1. Coating materials 201 and 202 are applied to positions on the outer peripheral surface 11A of the core 11 corresponding to the effective area R1 of the sheet 12. Furthermore, coating material 201 is applied in contact with the first end face 17A of the fixing member 17, and coating material 202 is applied in contact with the second end face 17B of the fixing member 17. Alternatively, coating material 201 may be applied close to the first end face 17A of the fixing member 17, and coating material 202 may be applied close to the second end face 17B of the fixing member 17.

[0365] After applying coating materials 201 and 202, as follows: Figure 45 As shown in (A), the winding start end 12A is arranged such that the sheet 12 covers the coating material 201. Specifically, the winding start end 12A of the sheet 12 is attached to the fixing member 17, and the winding start end 12A is fixed to the outer peripheral surface 11A of the core 11 via the fixing member 17.

[0366] After fixing the starting end 12A of the sheet 12 to the fixing member 17, as follows Figure 45As shown in (B), the sheet 12 is wound along the outer peripheral surface 11A of the core 11 while clamping a portion of the first exposure suppressing member 121 and a portion of the second exposure suppressing member 122. Specifically, the first exposure suppressing member 121 is positioned outside the coating material 202 on the width direction DR1 of the core 11, and the second exposure suppressing member 122 is positioned outside the coating material 201 on the width direction DR1 of the core 11. A portion of the first exposure suppressing member 121 is clamped between the core 11 and the first sheet 12, and a portion of the second exposure suppressing member 122 is clamped between the first sheet 12 and the second sheet 12. By clamping the first exposure suppressing member 121 and a portion of the second exposure suppressing member 122 in this way, the first exposure suppressing member 121 and the second exposure suppressing member 122 can be clamped continuously. Furthermore, a portion of the first exposure suppression member 121 and a portion of the second exposure suppression member 122 can be sandwiched between the core 11 and the sheet 12 of the first week.

[0367] When the sheet 12 is wound, the coating materials 201 and 202 flow and expand, so the coating material 202 fills the first gap 13 and the coating material 201 fills the second gap 15, forming a first filling portion 14 filling the first gap 13 and a second filling portion 16 filling the second gap 15. Thus, the roll 120 is obtained. Furthermore, in order to reliably expand and fill the first gap 13 and the like with the coating material 202, it is preferable that if the sheet 12 is longer than 1000m, the sheet 12 is wound to a length of 1000m or more; and if the sheet 12 is shorter than 1000m, the entire length of the sheet 12 is wound.

[0368] Furthermore, when the coating materials 201 and 202 are curable polymer compositions, the curable polymer composition is cured after the sheet 12 is wound at least twice. When the curable polymer composition is a one-component curable polymer composition (a moisture-curing polymer composition), the composition cures by reacting with humidity in the air and being placed at room temperature; therefore, it can be cured without the use of special devices such as heating devices or ionizing radiation irradiation devices. Furthermore, when the curable polymer composition is a two-component curable polymer composition, it can be cured by mixing the main agent and the curing agent.

[0369] In production Figure 41In the case of the roll 130 shown, firstly, after fixing the sheet 12 to the fixing member 17, a coating material 201 is applied along the width direction DR1 of the core 11 in at least the area corresponding to the second gap 15 in the effective area R1 of the sheet 12. Additionally, a coating material 202 is applied in such a way that it contacts the second end face 17B of the fixing member 17. Then, with the outer side of the coating material 201, 202 on the width direction DR1 of the core 11 exposed, the first portion 132A of the exposed suppressing member 132 is sandwiched between the core 11 and the first loop of the sheet 12, and a portion of the second portion 132B of the exposed suppressing member 132 is sandwiched between the first loop of the sheet 12 and the second loop of the sheet 12.

[0370] According to this embodiment, since the first filling portion 14 is filled in the first gap 13, the step difference caused by the winding start end 12A of the sheet 12 can be mitigated for the same reason as in the first embodiment.

[0371] According to this embodiment, since the second filling portion 16 is filled in the second gap 15, the step difference caused by the fixing member 17 can be effectively mitigated for the same reason as in the first embodiment.

[0372] According to this embodiment, since the step difference caused by the winding start end 12A of the sheet 12 and the step difference caused by the fixing member 17 can be mitigated, deformation of the sheet 12 can be suppressed. As a result, sheet waste can be reduced.

[0373] According to this embodiment, the end 14A of the first filling portion 14 overflows to the outside of the sheet 12, but the overflowing end 14A is covered by the first exposure suppression member 121, thus preventing the end 14A from being exposed to the outside of the sheet 12. As a result, it is possible to prevent the sheet 12 from being contaminated.

[0374] According to this embodiment, the end 16A of the second filling portion 16 overflows to the outside of the sheet 12, but the overflowing end 14A is covered by the second exposure suppression member 122, thus preventing the end 16A from being exposed to the outside of the sheet 12. As a result, it is possible to prevent the sheet 12 from being contaminated.

[0375] According to this embodiment, in the roll 130, the end 14A of the first filling portion 14 overflows to the outside of the sheet 12, but this overflowing end 14A is covered by the exposure suppression member 132, thus preventing the end 14A from being exposed to the outside of the sheet 12. Furthermore, since the exposure suppression member 132 is disposed on the outside of the second clamping portion 131 in the width direction DR1 of the core 11, the overflow of the second clamping portion 131 to the outside of the sheet 12 can be prevented, thereby preventing the end 131A of the second clamping portion 131 from being exposed to the outside of the sheet 12. Therefore, contamination of the sheet 12 can be prevented.

[0376] Example

[0377] To illustrate the invention in detail, the following examples are provided, but the invention is not limited to these descriptions.

[0378] <Example 1>

[0379] First, on the outer circumference of a cylindrical core made of fiber-reinforced plastic with an inner diameter of 153 mm, an outer diameter of 167 mm, and a width of 1600 mm, a rectangular double-sided tape with a length of 1380 mm, a width of 20 mm, and a thickness of 10 μm is pasted along the width direction of the core as a fixing component.

[0380] After applying the double-sided tape, the core is held in place by the clamping member of the winding device, securing it to the winding device. Then, in the area of ​​the outer circumference of the core corresponding to the non-effective area of ​​the acrylic resin film, a straight second exposure suppressing member is formed along the circumference of the core. This member is made of a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicon Co., Ltd.). The second exposure suppressing member is formed such that it extends 15 mm from the side edge of the acrylic resin film in the width direction. Furthermore, the second exposure suppressing member has a length L4 of 10 mm in the circumferential direction and a width W5 of 10 mm in the width direction. One end of the second exposure suppressing member in the length direction is on the double-sided tape, and the other end protrudes further than the double-sided tape in the winding direction of the acrylic resin film. The second exposure suppressing member is white. The length L4 and width W5 refer to... Figure 7 The part shown.

[0381] After the second exposure-suppressing component is formed, a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) is applied to the outer peripheral surface of the core located between the second exposure-suppressing components and corresponding to the effective area of ​​the acrylic resin film (described later as a sheet material), in contact with the first end face of the double-sided tape extending along the width direction of the core, at an environment of 25°C. The silicone resin composition is white in color. Furthermore, the shear viscosity of the silicone resin composition at the time of application is 40 Pa·s, and the silicone resin composition is applied at a rate of 1 cm per unit width along the width direction of the core. 3 The coating is applied in a straight line in a / m pattern.

[0382] Then, an acrylic resin film (in-plane phase difference Re: 5nm, no substrate layer) with a length of 3000m, a width of 1340mm, and a thickness of 80μm, is attached to the outer periphery of the core along the width direction of the winding with double-sided tape, thereby fixing the acrylic resin film to the outer periphery of the core. The acrylic resin film has: an effective area with a width of 1270mm; and a pair of ineffective areas with a width of 35mm, located on both sides of the effective area in the width direction of the acrylic resin film.

[0383] After the acrylic resin film is fixed to the outer peripheral surface of the core, a first exposure suppression member, made of a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd.), is formed along the circumference of the core from the region of the outer peripheral surface of the core corresponding to the ineffective region of the acrylic resin film to the ineffective region of the first circumferential region of the acrylic resin film. The first exposure suppression member is formed at a position 15 mm away from the side edge of the acrylic resin film in the width direction. In addition, in the first exposure suppression member, the length L3 in the circumferential direction of the core is 10 mm, the width W4 in the width direction of the core is 10 mm, and the thickness at the position where it contacts the end face of the acrylic resin film is 500 μm. One end of the first exposure suppression member in the length direction protrudes beyond the end face of the starting end of the winding of the acrylic resin film in the direction opposite to the winding direction of the acrylic resin film, and the other end is located on the starting end of the winding. The color of the first exposure suppression member is white. And, the length L3 and width W4 refer to Figure 7 The part shown.

[0384] After forming the first exposure suppression component, a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) is applied to the outer peripheral surface of the core located between the first exposure suppression components and corresponding to the effective area of ​​the acrylic resin film, at an environment of 25°C, in contact with the end face of the winding start end and the second end face of the double-sided tape opposite to the first end face. The silicone resin composition is white in color. Furthermore, the shear viscosity of the silicone resin composition at the time of application is 40 Pa·s, and the silicone resin composition is applied at a rate of 1 cm per unit width along the width direction of the core. 3 The coating is applied in a straight line in a / m pattern.

[0385] Then, the acrylic resin film is completely wound onto the core using a winding device. A silicone resin composition is filled into a first gap located between the core and the first layer of acrylic resin film, and in contact with the end face of the starting end of the winding of the acrylic resin film. A silicone resin composition is also filled into a second gap located between the core and the first layer of acrylic resin film, and in contact with the first end face of the double-sided tape. This yields a roll. Within the roll, the silicone resin composition cures, forming a first filling portion with a length of 20 mm, a width of 1300 mm, and a maximum thickness of 300 μm filling the first gap, and a second filling portion with a length of 20 mm, a width of 1300 mm, and a maximum thickness of 300 μm filling the second gap.

[0386] The shear viscosity of the silicone resin composition was measured using a dynamic viscoelasticity measuring device manufactured by Anton-Paar Japan Co., Ltd. Specifically, the shear viscosity of the silicone resin composition was determined by measuring the shear viscosity at a shear rate of 1 [1 / s] at 25°C using a parallel plate with a diameter of 25 mm. The shear viscosity of the silicone resin composition was then determined by measuring the shear viscosity of the silicone resin composition 10 times and calculating the arithmetic mean of the 8 shear viscosities remaining after removing the maximum and minimum values ​​from the 10 measured viscosities. The shear viscosity of the coating materials used in the other embodiments below was also measured in the same manner as in Example 1.

[0387] The in-plane phase difference Re of the acrylic resin film was measured using a phase difference film-optical material inspection device (product name "RETS-100", manufactured by Otsuka Electronics Co., Ltd.). Specifically, firstly, to stabilize the light source of the RETS-100, the light source was left to stand for at least 60 minutes after being turned on. Then, the rotating polarizer method was selected, and the θ mode (angular direction phase difference measurement mode) was chosen. By selecting this θ mode, the stage became a tilting rotating stage.

[0388] Next, enter the following measurement conditions in RETS-100.

[0389] (Measurement conditions)

[0390] • Delay measurement range: Rotating polarizer method

[0391] • Measuring point diameter: φ5mm

[0392] • Tilt angle range: -40° to 40°

[0393] • Measurement wavelength range: 400nm~800nm

[0394] • Average refractive index of the sample: 1.5

[0395] Thickness: 80μm

[0396] Next, without placing a sample in the apparatus, background data was obtained. The apparatus was configured as a closed system, which was implemented whenever the light source was turned on.

[0397] Then, a sample is placed on the worktable inside the device. The sample size is 50mm × 50mm. However, the sample is cut from a portion of the sheet that is more than 35mm away from the inside of the sheet from each end.

[0398] After setting up the sample, in an environment with a temperature of 23℃ and a relative humidity of 50%, the stage was rotated 360° in the XY plane to measure the fast and slow axes. After the measurement, the slow axis was selected. Then, while tilting the stage towards the set angle range centered on the slow axis, measurements were taken, with data (Re) for the set tilt angle range and set wavelength range obtained in 10° increments. The in-plane phase difference Re was measured at 5 different points. Specifically, as shown... Figure 10 As shown, measurements were taken at five points: the center A1 of the sample and points A2 to A4. The arithmetic mean of the three measurements taken from these five points (excluding the maximum and minimum values) was then used as the in-plane phase difference Re.

[0399] <Example 2>

[0400] In Example 2, a first exposure suppression component made of a buffer strip (product name "polyurethane foam strip 4032", manufactured by 3M Japan Co., Ltd.) was used instead of a first exposure suppression component made of a two-component curable silicone resin composition. Otherwise, the roll body was obtained in the same manner as in Example 1. Regarding the first exposure suppression component, its length L3 in the circumferential direction of the roll core is 45 mm, its width W4 in the width direction of the roll core is 40 mm, and its thickness at the position where it contacts the end face of the acrylic resin film is 800 μm.

[0401] <Example 3>

[0402] In Example 2, a first exposure suppression component made of a polyurethane resin composition (product name "SORBOTHANE", manufactured by Sanjin Kosan Co., Ltd.) was used instead of a first exposure suppression component made of a two-component curable silicone resin composition. Otherwise, the roll body was obtained in the same manner as in Example 1. The first exposure suppression component has a circumferential length L3 of 100 mm, a width W4 of 10 mm in the width direction of the roll core, and a thickness of 1000 μm at the point where it contacts the end face of the acrylic resin film.

[0403] <Example 4>

[0404] In Example 4, a one-component curable silicone resin composition (product name "Hapio Seal ProHG", manufactured by Campe Hapio Co., Ltd.) was used instead of a two-component curable silicone resin composition to form the first filler portion and the second filler portion. Otherwise, the roll body was obtained in the same manner as in Example 1. The one-component curable silicone resin composition was gray, and its shear viscosity at the time of application was 180 Pa·s.

[0405] <Example 5>

[0406] In Example 5, the coating amount per unit width was 0.3 cm. 3 The first filling portion and the second filling portion are formed by applying a two-component curable silicone resin composition in a / m manner. Otherwise, the roll body is obtained in the same manner as in Example 1.

[0407] <Example 6>

[0408] In Example 6, a polyethylene terephthalate (PET) film with a length of 3400 mm, a width of 1495 mm, and a thickness of 75 μm (in-plane phase difference Re: 2250 nm) was used instead of an acrylic resin film, and otherwise, the roll was obtained in the same manner as in Example 1. The PET film has a base layer on both sides.

[0409] <Example 7>

[0410] In Example 7, a polyethylene terephthalate (PET) film (product name "CosmosineSRF (registered trademark)", Toyobo Co., Ltd., in-plane phase difference Re: 8400nm) with a length of 3400mm, a width of 1495mm, and a thickness of 75μm was used instead of an acrylic resin film. Otherwise, the roll was obtained in the same manner as in Example 1. The PET film has a base layer on both sides.

[0411] <Example 8>

[0412] In Example 8, a cyclic olefin polymer (COP) film with a length of 3000 m, a width of 1250 mm, and a thickness of 47 μm (in-plane phase difference Re: 99.7 nm) was used instead of an acrylic resin film, and the roll was otherwise obtained in the same manner as in Example 1. The COP film did not have a base layer.

[0413] <Example 9>

[0414] First, a rectangular double-sided tape with a length of 1380 mm, a width of 20 mm, and a thickness of 10 μm is attached along the width direction of the cylindrical core made of fiber-reinforced plastic with an inner diameter of 153 mm, an outer diameter of 167 mm, and a width of 1600 mm to the outer circumference of the core.

[0415] After applying the double-sided tape, the roll core is held in place by the take-up device's clamping member. Then, a one-component curable silicone resin composition (product name "Hapio Seal Pro HG," manufactured by Campe Hapio Co., Ltd.) is applied as a coating material at 25°C, with the first end face of the double-sided tape extending along the width direction of the roll core in contact with the tape. The silicone resin composition is gray in color. Furthermore, the shear viscosity of this silicone resin composition during application is 180 Pa·s, and the silicone resin composition is applied at a rate of 1 cm per unit width along the width direction of the roll core. 3 The coating is applied in a straight line in a / m pattern.

[0416] Then, the starting end of the winding of an acrylic resin film (in-plane phase difference Re: 5nm) with a length of 3000m, a width of 1340mm and a thickness of 80μm is attached to double-sided tape along the width direction of the core, thereby fixing the acrylic resin film to the outer peripheral surface of the core.

[0417] After fixing the acrylic resin film to the outer periphery of the core, a one-component curable silicone resin composition (product name "Hapio Seal Pro HG", manufactured by Campe Hapio Co., Ltd.) is applied as the coating material in the area of ​​the core corresponding to the effective area of ​​the acrylic resin film, in contact with the end face of the winding start end and the second end face of the double-sided tape opposite to the first end face, at an environment of 25°C. The silicone resin composition is gray in color. Furthermore, the shear viscosity of the silicone resin composition during application is 180 Pa·s, and the silicone resin composition is applied at a rate of 1 cm per unit width along the width direction of the core. 3 The coating is applied in a straight line in a / m pattern.

[0418] Then, the acrylic resin film is completely wound onto the core using a winding device. The first gap, located between the core and the first layer of acrylic resin film and in contact with the end face of the starting end of the winding of the acrylic resin film, is filled with a silicone resin composition. The second gap, located between the core and the first layer of acrylic resin film and in contact with the first end face of the double-sided tape, is also filled with a silicone resin composition.

[0419] Furthermore, during the winding of the acrylic resin film, a first exposure-suppressing member (product name "Kokofusen L-size", manufactured by Kanmido Co., Ltd.) is partially sandwiched between the core and the ineffective area of ​​the acrylic resin film, and outside the silicone resin composition filling the first gap in the width direction of the acrylic resin film. A second exposure-suppressing member (product name "Kokofusen L-size", manufactured by Kanmido Co., Ltd.) is partially sandwiched between the ineffective areas of the acrylic resin film in the first and second turns, and at least in the area corresponding to the second gap in the width direction of the acrylic resin film. Thus, a roll is obtained.

[0420] Within the roll body, an organosilicon resin composition is cured to form a first filling portion with a length of 20 mm, a width of 1340 mm, and a maximum thickness of 300 μm, filling the first gap; and a second filling portion with a length of 20 mm, a width of 1340 mm, and a maximum thickness of 300 μm, filling the second gap. The first exposure suppression member has a circumferential length L6 of 30 mm, a width W6 of 42 mm, and a thickness of 25 μm in the width direction of the roll core. The second exposure suppression member has a circumferential length L7 of 30 mm, a width W7 of 42 mm, and a thickness of 25 μm in the width direction of the roll core. Furthermore, lengths L6 and L7, and widths W6 and W7 refer to... Figure 38 The part shown.

[0421] <Example 10>

[0422] In Example 10, double-sided adhesive tape (product name "double-sided adhesive tape VR-5000", manufactured by Nitto Denko Corporation) was used instead of single-sided adhesive tape as the first exposure suppression component and the second exposure suppression component. Otherwise, the roll was obtained in the same manner as in Example 9.

[0423] <Example 11>

[0424] First, on the outer circumference of a cylindrical core made of fiber-reinforced plastic with an inner diameter of 153 mm, an outer diameter of 167 mm, and a width of 1600 mm, a rectangular double-sided tape with a length of 1380 mm, a width of 20 mm, and a thickness of 10 μm is pasted along the width direction of the core as a fixing component.

[0425] After applying the double-sided tape, the core is held in place by the take-up device's clamping mechanism. Then, an acrylic resin film (in-plane phase difference Re: 5nm), 3000m long, 1340mm wide, and 80μm thick, is attached to the double-sided tape along the width of the core, thus fixing the acrylic resin film to the outer periphery of the core. The acrylic resin film has: an effective area with a width of 1270mm; and a pair of ineffective areas, each 35mm wide, located on either side of the effective area in the width direction of the acrylic resin film.

[0426] After the acrylic resin film is fixed to the outer peripheral surface of the core, a linear exposure suppression member is formed along the circumference of the core from the region on the outer peripheral surface of the core corresponding to the ineffective area of ​​the acrylic resin film to the ineffective area of ​​the acrylic resin film of the first turn. This member is made of a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicon Co., Ltd.). The exposure suppression member is an integral part of the first and second exposure suppression members, having a first part corresponding to the first exposure suppression member and a second part corresponding to the second exposure suppression member. The exposure suppression member is formed 15 mm away from the side edge of the acrylic resin film in the width direction. Furthermore, the exposure suppression member has a length of 150 mm in the circumferential direction of the core, a width of 10 mm in the width direction of the core, and a thickness of 500 μm at the end face where it contacts the beginning of the winding of the acrylic resin film. The exposure suppression member is white.

[0427] Then, in the area of ​​the core corresponding to the effective area of ​​the acrylic resin film, a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) is applied as a coating material at 25°C, in a manner that contacts the end face of the winding start end and the second end face of the double-sided tape opposite to the first end face. Additionally, at 25°C, the two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) is applied as a coating material to the effective area of ​​the acrylic resin film, specifically in the area between the core and the first loop of the acrylic resin film, corresponding to the second gap that contacts the first end face of the double-sided tape. The color of these silicone resin compositions is white. In addition, the shear viscosity of these silicone resin compositions during coating is 40 Pa·s, and these silicone resin compositions are applied at a rate of 1 cm per unit width along the width direction of the roll core. 3 The coating is applied in a straight line in a / m pattern.

[0428] Then, the acrylic resin film is completely wound onto the core using a winding device. The first gap, located between the core and the acrylic resin film of the first turn and in contact with the end face of the starting end of the winding of the acrylic resin film, is filled with an organosilicon resin composition. The area between the acrylic resin films of the first turn and the second turn, corresponding to the second gap, is also filled with an organosilicon resin composition.

[0429] In the roll body, the silicone resin composition is cured to form a first filling part with a length of 20 mm, a width of 1340 mm, and a maximum thickness of 300 μm filling the first gap, and a second clamping part with a length of 20 mm, a width of 1340 mm, and a maximum thickness of 200 μm located between the acrylic resin films of the first and second circumferences and in the region corresponding to the second gap.

[0430] <Comparative Example 1>

[0431] In Comparative Example 1, the roll was obtained in the same manner as in Example 1, except that the first filling portion and the second filling portion were not formed.

[0432] <Comparative Example 2>

[0433] In Comparative Example 2, the roll was obtained in the same manner as in Example 1, except that the first exposure suppression member and the second exposure suppression member were not formed.

[0434] <Measuring Deformation Mitigation Length>

[0435] In the rolls of the embodiments and comparative examples, the length by which the step difference caused by the beginning of the film winding and the step difference caused by the double-sided tape were mitigated were measured. Specifically, since the step difference decreases from the beginning of the winding to the end of the winding, the film was first fed out while measuring the feed length (m) until the point where the step difference was visually confirmed. Then, the film was cut at the point where the step difference was visually confirmed. With the cut portion of the film adhered to a polyvinyl alcohol film, the film was visually observed using reflected light in an indoor environment of 800 Lux to 2000 Lux, with a white LED light shining into the film. Then, the distance from the point where the step difference could not be seen to the beginning of the winding was measured and taken as the deformation mitigation length. Here, the outline of the white LED reflected in the film is compared with other parts of the film. Areas exhibiting deformation are considered to have a step difference, while areas where the outline of the white LED reflected around a step difference is identical to the rest of the film are considered to have no step difference. The white LEDs are arranged such that their length direction runs along the length direction of the film. The length of the white LED spans both the areas with and without step differences in the film. During observation, a suitable point is chosen where the lines of the white LEDs are clearly visible, ensuring that the outlines of the white LEDs are reflected in the film. Furthermore, visual observation is performed from all angles (~180° to 180°) with the normal direction of the film surface as the reference (0°).

[0436] <Appearance Evaluation>

[0437] In the rolls of the embodiments and comparative examples, it was observed whether the first filling portion and the second filling portion, or a portion of the second clamping portion, were exposed on the outside of the film. Fifteen observers were present. If all observers agreed that the first filling portion and the second filling portion, or a portion of the second clamping portion, were not exposed, it was determined that the first filling portion and the second filling portion, or the second clamping portion, were not exposed. The evaluation criteria are as follows.

[0438] A: Part of the first filling part and part of the second filling part or part of the first filling part and part of the second clamping part are not exposed.

[0439] B: Part of the first filling part and part of the second filling part or part of the first filling part and part of the second clamping part are exposed.

[0440] <Confirming the existence of the first clamping section>

[0441] In the rolls of Examples 1, 4, and 5, it was confirmed whether a first clamping portion existed at the beginning of the winding. Specifically, firstly, an acrylic resin film was fed from the roll until the surface became the second turn of the acrylic resin film. Then, in the roll where the second turn of the acrylic resin film became the surface, the vicinity of the beginning of the winding was visually observed to see if there was a colored portion at the beginning of the winding. Moreover, if there was a colored portion at the beginning of the winding, it was considered that a first clamping portion existed; if there was no colored portion, it was considered that a first clamping portion did not exist. There were 15 observers, and if all observers believed that there was a colored portion at the beginning of the winding, it was determined that a first clamping portion existed.

[0442] <Measurement of L1, L1+L2, T1, T2, S1, S1+S2>

[0443] In the rolls of Examples 1, 4, and 5, when the presence of the first clamping part is not confirmed, the length L1, thickness T1, T2, and area S1 are measured, and the ratio of length L1 / thickness T2 and area S1 / thickness T2 are calculated. Alternatively, when the presence of the first clamping part is confirmed, the length L1 + length L2, thickness T1, T2, and area S1 + area S2 are measured, and the ratios of (length L1 + length L2) / thickness T2 and (area S1 + area S2) / thickness T2 are calculated. Furthermore, length L1, L2, thickness T1, T2, and area S1, S2 refer to... Figure 4 and Figure 5 The part shown.

[0444] Specifically, first, prepare a jig for rotating the roll and a laser displacement gauge (product name "LK-G30", manufactured by KEYENCE Co., Ltd.), and position them accordingly. The jig is inserted into a hole in the width direction of the roll core, thereby holding the roll in a position to rotate.

[0445] Three laser displacement gauges are positioned above the roll body, arranged to irradiate the surface of the roll body with laser light. The placement of the laser displacement gauges is as follows: First, positions 1 and 2 are determined that divide the width of the acrylic resin film into three equal parts. Position 1 is located at the first end of the acrylic resin film along its short side, and position 2 is located at the second end opposite to position 1. Furthermore, the first laser displacement gauge is positioned to irradiate the laser at the midpoint between position 1 and the first end, the second laser displacement gauge is positioned to irradiate the laser at the midpoint between position 1 and position 2, and the third laser displacement gauge is positioned to irradiate the laser at the midpoint between position 2 and the second end.

[0446] Then, the roll is mounted on a fixture, and the acrylic resin film is fed out of the roll until the first filler portion is exposed. With the first filler portion exposed, at a temperature of 23°C and a relative humidity of 50%, the core is rotated at a speed of 30 mm / s, and the displacement is continuously measured using a laser displacement meter with a sampling period of 200 μs, resulting in a graph with position (mm) on the horizontal axis and displacement (mm) on the vertical axis. This measurement is performed from the end of the first filler portion towards the position where it contacts the end face. In this measurement, the reference height (the line with a displacement of 0 mm) is taken as the height of the core, and the difference between the height of the core and the height of the first filler portion is taken as the thickness of the first filler portion. The resulting graph is a plane that substantially includes the length direction of the sheet and the radial direction of the core. Furthermore, in this graph, one graduation on the horizontal axis is set to 5 mm, and one graduation on the vertical axis is set to 0.02 mm.

[0447] In this curve diagram, the position on the displacement curve where the displacement begins to decrease sharply is designated as position E1. Furthermore, without confirming the existence of the first clamping part, the thickness T2 at the position where the first filling part contacts the end face is calculated by finding the difference between the line with a displacement of 0 mm and the displacement at position E1.

[0448] With the presence of the first clamping part confirmed, the thickness T2 was measured using the following method. First, a sample of 2cm × 2cm in size, including the portion of the sheet 12 containing the winding start end 12A, the first filling portion 14, and the second loop, was collected and fixed. Then, the cross-section of the fixed sample was ground, and the thickness T2 of the first filling portion was measured using a stereo microscope (product name "Digital Microscope VHX-7000", manufactured by KEYENCE Co., Ltd.) at an environment of 23°C and 50% relative humidity. In the measurement of thickness T2 based on the stereo microscope, coaxial epi-illumination was selected as the illumination for the digital microscope, and the measurement was performed at 500x magnification under dark-field and reflected light conditions.

[0449] Furthermore, in the absence of confirmation of the existence of the first clamping part, the length L1 is calculated from the position displacement curve graph, similar to the thickness T2. Specifically, firstly, according to the curve graph, the aforementioned position E1 is set, and the intersection of the line where the displacement begins to rise and the position displacement curve is set as position E2. Next, an imaginary line IL4 is drawn that passes through the aforementioned position E1 and is perpendicular to the line where the displacement is 0 mm. Then, the intersection of the imaginary line IL4 and the line where the displacement is 0 mm is taken as position E3, and the distance between position E2 and position E3 is calculated, thereby calculating the length L1. The area S1 is calculated as follows: in the region from the aforementioned position E2 to position E3, the product of the thickness at each measurement point and the width between each measurement point is calculated, and these products are summed. Furthermore, based on the aforementioned formula (3), the width between measurement points is calculated from the sampling period, the rotation speed of the core, and the outer diameter of the core, and the result is 6.24 μm. If the existence of the first clamping part is confirmed, the length L1 + length L2 is calculated in the same way as if the existence of the first clamping part is not confirmed.

[0450] Then, if the existence of the first clamping part is not confirmed, the calculated length L1 / thickness T2 and area S1 / thickness T2 are calculated using the calculated length L1, thickness T2, and area S1. Alternatively, if the existence of the first clamping part is confirmed, the calculated sum of length L1 and length L2, thickness T2, and area S1 and area S2 are used to calculate (length L1 + length L2) / thickness T2 and (area S1 + area S2) / thickness T2.

[0451] The edge thickness T1 was measured using a scanning optical interferometer surface shape measuring instrument (product name "New View7300", manufactured by Zygo). Specifically, firstly, when the acrylic resin film is completely fed out, the first filler portion may adhere to the side of the acrylic resin film and peel off from the core. Then, one or more samples with a size of 2mm × 5mm, including the first filler portion, are cut from the acrylic resin film. The sample is cut from any part of the end containing the first filler portion, free from dirt, fingerprints, etc. Then, the edge thickness T1 of the first filler portion is measured under the following measurement conditions. The edge thickness T1 is obtained by measuring the edge thickness at 10 locations and calculating the arithmetic mean of the 8 thicknesses after removing the maximum and minimum values ​​from the 10 measured thicknesses.

[0452] (Measurement conditions)

[0453] • Objective lens: 10x

[0454] • Zoom: 1x

[0455] • Measurement area: 2.17mm × 2.17mm

[0456] • Scan Length: 5μm

[0457] min mod: 0.015

[0458] Temperature: 23℃

[0459] Relative humidity: 50%

[0460] The results are shown in Tables 1 and 2 below.

[0461] [Table 1]

[0462]

[0463] [Table 2]

[0464]

[0465] In the roll of Comparative Example 1, both the deformation easing length at the beginning of winding and the deformation easing length at the double-sided tape are relatively long. This is believed to be because: since the first gap is a void, the step difference caused by the beginning of winding the acrylic resin film is relatively large; and since the second gap is a void, the step difference caused by the double-sided tape is relatively large. In contrast, in the rolls of Examples 1 to 11, both the deformation easing length at the beginning of winding and the deformation easing length at the double-sided tape are shorter than those of the roll of Comparative Example 1. This is believed to be because: in the rolls of Examples 1 to 10, the first gap is filled with a first filler portion, thus the step difference caused by the beginning of winding the acrylic resin film is relatively small; and the second gap is filled with a second filler portion, or a second clamping portion is sandwiched in the region corresponding to the second gap, thus the step difference caused by the double-sided tape is relatively small.

[0466] In the roll of Comparative Example 2, the end of the first filler portion was exposed. This was believed to be because pressure was applied to the silicone resin composition during the winding of the acrylic resin film, causing it to overflow to the outside of the acrylic resin film. In contrast, the rolls of Examples 1-8 included a first exposure suppressing portion that suppressed the overflow of the first filler portion itself and a second exposure suppressing member that suppressed the overflow of the second filler portion itself, so the ends of the first filler portion and the second filler portion did not overflow from the acrylic resin film or the like, and thus were not exposed. Furthermore, in the rolls of Examples 9 and 10, since a first exposure suppressing portion covering the overflowing end of the first filler portion and a second exposure suppressing member covering the overflowing end of the second filler portion were included, the ends of the first filler portion and the second filler portion were not exposed. In the roll of Example 11, since a first portion covering the overflowing end of the first filler portion and a second portion suppressing the overflow of the second filler portion itself were included, the ends of the first filler portion and the second filler portion were not exposed.

[0467] The deformation easing length at the beginning of winding in the roll of Example 6 is shorter than that at the beginning of winding in the roll of Example 7. This is believed to be because the in-plane phase difference of the PET film used in the roll of Example 6 is smaller than that of the PET film used in the roll of Example 7.

[0468] In Examples 1 and 4, the length L1 / thickness T2 or (length L1 + length L2) / thickness T2 of the first filling portion of the roll is 90 or more, and / or the area S1 / thickness T2 or (area S1 + area S2) / thickness T2 is 3.0 or more. Therefore, compared with the roll of Example 5, where the length L1 / thickness T2 is less than 90, the deformation easing length at the beginning of the winding is shorter.

[0469] Label Explanation

[0470] 10, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130: roll body;

[0471] 11: Roll core;

[0472] 11A: Outer peripheral surface;

[0473] 12: Sheets;

[0474] 12A: The beginning of the winding;

[0475] 12A1: End face;

[0476] 13: First gap;

[0477] 14: First filling section;

[0478] 15: Second gap;

[0479] 16: Second filling section;

[0480] 17, 81: Fixed components;

[0481] 18, 101, 121: First exposed suppression component;

[0482] 19, 102, 122: Second exposed suppression component;

[0483] 111: Second clamping section;

[0484] 112, 132: Exposed suppression components.

Claims

1. A roll comprising a core and an elongated sheet wound around the outer periphery of the core, wherein, The volume body has: The first gap is located between the core and the sheet of the first turn, and is in contact with the end face of the winding start end of the sheet of the first turn in the longitudinal direction. The first filling portion is filled in the first gap and extends in the width direction of the core; as well as The first exposure suppression member suppresses the exposure of the end of the first filling portion on the outside of the sheet in the width direction. The first exposure suppression member is located outside the end of the first filling portion in the width direction and is covered by the sheet.

2. The scroll body according to claim 1, wherein, The first exposure suppression member extends circumferentially along the core.

3. The scroll body according to claim 1, wherein, The length of the first exposure suppression member in the circumferential direction of the core is greater than the maximum length of the first filling part in the circumferential direction.

4. The scroll body according to claim 1, wherein, The first filling portion contains coloring material or luminescent material.

5. The scroll body according to claim 1, wherein, The first filling portion contains a cured product of a curable polymer composition.

6. The scroll body according to claim 1, wherein, The first exposure suppression component is made of resin, or the first exposure suppression component is a strip.

7. The scroll body according to claim 1, wherein, The sheet material is a resin film, paper, or glass film.

8. The scroll body according to claim 1, wherein, The sheet material comprises acrylic resin, polyester resin, or cycloolefin polymer resin.

9. The scroll body according to claim 1, wherein, The thickness of the sheet is 15 μm or more and 300 μm or less.

10. A roll comprising a core and an elongated sheet wound around the outer periphery of the core, wherein, The volume body has: The first gap is located between the core and the sheet of the first turn, and is in contact with the end face of the winding start end of the sheet of the first turn in the longitudinal direction. The first filling portion is filled in the first gap and extends in the width direction of the core; as well as The first exposure suppression member suppresses the exposure of the end of the first filling portion on the outside of the sheet in the width direction. The sheet material has: an effective area; The first exposure suppression member is located in the non-effective area of ​​the sheet, outside the effective area in the width direction.

11. A roll comprising a core and an elongated sheet wound around the outer periphery of the core, wherein, The volume body has: The first gap is located between the core and the sheet of the first turn, and is in contact with the end face of the winding start end of the sheet of the first turn in the longitudinal direction. The first filling portion is filled in the first gap and extends in the width direction of the core; as well as The first exposure suppression member suppresses the exposure of the end of the first filling portion on the outside of the sheet in the width direction. The end of the first filling portion overflows to the outside of the sheet. The first exposure suppression member is sheet-shaped and covers the overflowing end of the first filling portion.

12. A roll comprising a core and an elongated sheet wound around the outer periphery of the core, wherein, The volume body has: A fixing member is disposed between the core and the sheet of the first turn, having a first end face extending in the width direction of the core and a second end face on the opposite side of the first end face, and fixing a portion of the sheet relative to the core. The second gap is located between the core and the sheet of the first turn, and is in contact with the first end face of the fixing member; The second filling portion is filled in the second gap and extends in the width direction of the core; as well as The second exposure-suppressing component prevents the end of the second filling portion in the width direction from being exposed on the outside of the sheet. The second exposure suppression member is located outside the end of the second filling portion in the width direction and is covered by the sheet.

13. The scroll body according to claim 12, wherein, The sheet has: an effective area; and an ineffective area located outside the effective area in the width direction, wherein the second exposure suppression member is located in the ineffective area of ​​the sheet.

14. The scroll body according to claim 12, wherein, The second exposure suppression member extends circumferentially along the core.

15. The scroll body according to claim 12, wherein, The length of the second exposure suppression member in the circumferential direction of the core is greater than the maximum length of the second filling portion in the circumferential direction.

16. The scroll body according to claim 12, wherein, The second filling portion contains coloring material or luminescent material.

17. The scroll body according to claim 12, wherein, The second filling portion contains a cured product of a curable polymer composition.

18. The scroll body according to claim 12, wherein, The sheet material is a resin film, paper, or glass film.

19. The scroll body according to claim 12, wherein, The sheet material comprises acrylic resin, polyester resin, or cycloolefin polymer resin.

20. The scroll body according to claim 12, wherein, The thickness of the sheet is 15 μm or more and 300 μm or less.

21. A roll comprising a core and an elongated sheet wound around the outer periphery of the core, wherein, The volume body has: A fixing member is disposed between the core and the sheet of the first turn, having a first end face extending in the width direction of the core and a second end face on the opposite side of the first end face, and fixing a portion of the sheet relative to the core. The second gap is located between the core and the sheet of the first turn, and is in contact with the first end face of the fixing member; The second filling portion is filled in the second gap and extends in the width direction of the core; as well as The second exposure-suppressing component prevents the end of the second filling portion in the width direction from being exposed on the outside of the sheet. The end of the second filling portion overflows to the outside of the sheet. The second exposure suppression member is sheet-shaped and covers the overflowing end of the second filling portion.

22. A roll comprising a core and an elongated sheet wound around the outer periphery of the core, wherein, The volume body has: A fixing member is disposed between the core and the sheet of the first turn, having a first end face extending in the width direction of the core and a second end face located on the side opposite to the first end face and closer to the winding start end side of the sheet of the first turn in the length direction than the first end face, and fixing a portion of the sheet relative to the core. The second gap is located between the core and the sheet of the first winding, and is in contact with the first end face of the fixing member; A clamping portion is provided in the area between the sheets after the first cycle, at least corresponding to the second gap, and extends in the width direction of the core; as well as The second exposure suppression member suppresses the end of the clamping portion in the width direction from being exposed on the outside of the sheet.

23. The scroll body according to claim 22, wherein, The second exposure suppressing member is located outside the end of the clamping portion in the width direction, and at least a portion of the second exposure suppressing member is covered by the sheet.

24. The scroll body according to claim 22, wherein, The second exposure suppression member extends circumferentially along the core.

25. The scroll body according to claim 22, wherein, The length of the second exposure suppression member in the circumferential direction of the core is greater than the maximum length of the clamping part in the circumferential direction.

26. The scroll body according to claim 22, wherein, The clamping part contains coloring material or luminescent material.

27. The scroll body according to claim 22, wherein, The clamping part contains a cured product of a curable polymer composition.

28. The scroll body according to claim 22, wherein, The sheet material is a resin film, paper, or glass film.

29. The scroll body according to claim 22, wherein, The sheet material comprises acrylic resin, polyester resin, or cycloolefin polymer resin.

30. The scroll body according to claim 22, wherein, The thickness of the sheet is 15 μm or more and 300 μm or less.

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