Roll body

Abstract

Provided is a roll body such that it is possible to effectively reduce a level difference caused by the winding start end of a sheet and suppress contamination. According to one aspect of the present invention, provided is a roll body 10 which is equipped with a winding core 11 and a long sheet 12 wound around the outer peripheral surface 11A of the winding core 11, the roll body 10 comprising: a first gap 13 that is located between the winding core 11 and the first lap sheet 12 and in contact with the leading-end surface 12A at the winding start end 12A of the first lap sheet 12 in the longitudinal direction DR2; a first filling portion 14 that fills the first gap 13 and extends in the width direction DR1 of the winding core 11; and a first exposure suppression member 18 that suppresses the end 14A of the first filling portion 14 in the width direction DR1 from being exposed outside the sheet 12.

Description

REFERENCE TO RELATED APPLICATIONS

[0001] This application benefits from the priority of an earlier Japanese application, Patent Application No. 2020-131040 (filing date: July 31, 2020), the entire disclosure of which is incorporated herein by reference. [Technical field]

[0002] The present invention relates to a roll body. [Background technology]

[0003] From the viewpoint of manufacturing efficiency, a certain amount of sheets such as films are often manufactured at once, wound around a core, and stored as a roll. In such rolls, a step occurs due to the winding start end of the sheet. Specifically, a step occurs when the first turn of the sheet moves to the second turn, and the step appears in the second turn and thereafter. Note that, depending on the type of sheet, when this step occurs, the sheet may deform and may not return to its original shape.

[0004] Currently, the following techniques have been proposed to reduce the above-mentioned difference in level: a cushion tape with high cushioning properties, such as urethane resin, is attached to or embedded in the outer peripheral surface of the winding core and then the sheet is embedded in the cushion tape (see, for example, Patent Document 1); a technique in which a winding core having rubber on its outer peripheral surface is used and the sheet is embedded in the rubber to reduce the difference in level; and a technique in which a resilient cushioning material is provided on the outer peripheral surface of the winding core along the tip of the starting end of the sheet (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2005-75521 A [Patent Document 2] JP 2013-199355 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, under the current circumstances, none of the above techniques can effectively reduce the step.

[0007] In addition, when winding a sheet around a core, a fixing member such as double-sided tape is first attached to the outer peripheral surface of the core to fix a part of the sheet (for example, the winding start end). However, this fixing member can sometimes cause a step.

[0008] Currently, in order to effectively reduce these steps, it is being considered to fill the gaps that form when the first round of the sheet moves to the second round, and the gaps that form between the fixing member and the first round of the sheet, with a filler, but if filler is filled into these gaps, there is a risk that the filler will protrude due to the pressure when the sheet is wound up. If the protruding part is exposed, it may adhere to the roll body, etc., causing contamination.

[0009] The present invention has been made to solve the above problems. That is, an object of the present invention is to provide a roll body that can effectively reduce the step caused by the winding start end of the sheet and suppress contamination. Another object of the present invention is to provide a roll body that can effectively reduce the step caused by the fixing member and suppress contamination. [Means for solving the problem]

[0010] The present invention includes the following inventions. [1] A roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core, the roll body including: a first gap located between the winding core and a first turn of the sheet and in contact with a tip end surface at a longitudinal winding start end of the first turn of the sheet; a first filling portion filling the first gap and extending in a width direction of the winding core; and a first exposure suppression member suppressing exposure of an end of the first filling portion in the width direction to the outside of the sheet.

[0011] [2] The roll body described in [1] above, wherein the first exposure suppression member is located outside the end of the first filling section in the width direction and is covered by the sheet.

[0012] [3] The roll body described in [1] or [2] above, wherein the sheet has an effective area and a non-effective area located outside the effective area in the width direction, and the first exposure suppression member is located in the non-effective area of ​​the sheet.

[0013] [4] The roll body according to [2] or [3] above, wherein the first exposure suppression member extends along the circumferential direction of the winding core.

[0014] [5] A roll body described in any one of [2] to [4] above, wherein the length of the first exposure suppression member in the circumferential direction of the winding core is greater than the maximum length of the first filling portion in the circumferential direction.

[0015] [6] The roll body described in [1] above, wherein the end of the first filling portion protrudes outside the sheet, and the first exposure suppression member is sheet-shaped and covers the protruding end of the first filling portion.

[0016] [7] The roll body according to any one of [1] to [6] above, wherein the first filling section contains a coloring material or a luminescent material.

[0017] [8] The roll body according to any one of the above [1] to [6], wherein the first filling section contains a cured product of a curable polymer composition.

[0018] [9] The roll body described in any one of [1] to [8] above, wherein the first exposure suppressing member is made of resin or is a tape.

[0019]

[10] A roll body including a winding core and a long sheet wound around an outer peripheral surface of the winding core, the roll body including: a fixing member provided between the winding core and a first turn of the sheet, the fixing member having a first end face extending in a width direction of the winding core and a second end face opposite the first end face, and fixing a part of the sheet to the winding core; a second gap located between the winding core and the first turn of the sheet 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 winding core; and a second exposure suppression member that suppresses exposure of an end of the second filling portion in the width direction outside the sheet.

[0020]

[11] The roll body described in

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

[0021]

[12] The roll body described in

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

[0022]

[13] The roll body according to

[11] or

[12] above, wherein the second exposure suppression member extends along the circumferential direction of the winding core.

[0023]

[14] A roll body described in any one of

[11] to

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

[0024]

[15] The roll body described in

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

[0025]

[16] The roll body according to any one of

[10] to

[15] above, wherein the second filling section contains a coloring material or a luminescent material.

[0026]

[17] The roll body according to any one of

[10] to

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

[0027]

[18] A roll body comprising a winding core and a long sheet wound around an outer peripheral surface of the winding core, the roll body comprising: a fixing member that is provided between the winding core and the sheet of a first turn and has a first end face extending in the width direction of the winding core and a second end face that is located opposite the first end face and is located closer to the longitudinal winding start end of the sheet of the first turn than the first end face, and that fixes a part of the sheet to the winding core; a second gap that is located between the winding core and the sheet of the first turn and in contact with the first end face of the fixing member; an intermediate portion that is provided in at least a region corresponding to the second gap between the sheets of the first turn and onwards and extends in the width direction of the winding core; and a second exposure suppression member that suppresses exposure of an end of the intermediate portion in the width direction to the outside of the sheet.

[0028]

[19] The roll body described in

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

[0029]

[20] The roll body described in

[18] or

[19] above, wherein the second exposure suppression member extends along the circumferential direction of the winding core.

[0030]

[21] A roll body described in any one of

[18] to

[20] above, wherein the length of the second exposure suppression member in the circumferential direction of the winding core is greater than the maximum length of the interposed portion in the circumferential direction.

[0031]

[22] The roll body according to any one of

[18] to

[21] above, wherein the interposed portion contains a coloring material or a luminescent material.

[0032]

[23] The roll body according to any one of

[18] to

[21] above, wherein the interposed portion contains a cured product of a curable polymer composition.

[0033]

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

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

[0034]

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

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

[0035]

[26] The roll body described in any one of [1] to

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

[0036] According to one aspect of the present invention, a roll body can be provided that can effectively reduce the step caused by the winding start end of the sheet and suppress contamination. According to another aspect of the present invention, a roll body can be provided that can effectively reduce the step caused by the fixing member and suppress contamination. [Brief description of the drawings]

[0037] [Figure 1] FIG. 1 is a perspective view of a roll body according to a first embodiment. [Diagram 2] FIG. 2 is a plan view of the roll body of FIG. [Diagram 3] FIG. 3 is an enlarged view of a part of the cross section of the roll body shown in FIG. 2 taken along line II. [Figure 4] FIG. 4 is a diagram for explaining the dimensions of each component of the roll body in FIG. [Diagram 5] FIG. 5 is a diagram showing two regions around the first filling section of the roll body of FIG. [Figure 6] FIG. 6 is an enlarged view of a part of the cross section taken along line II-II of the roll body in FIG. [Figure 7] FIG. 7 is an enlarged plan view of a portion of the roll body in FIG. [Figure 8]FIG. 8 is an enlarged view of a part of another roll body according to the first embodiment. [Figure 9] FIG. 9 is an enlarged view of a part of another roll body according to the first embodiment. [Figure 10] FIG. 10 is a plan view of a sample for identifying the position at which the in-plane retardation is measured. [Figure 11] FIG. 11 is a plan view of a roll body for identifying a measurement position by a laser displacement meter. [Figure 12] FIG. 12 is an image graph of the amount of displacement versus position created based on the measurement of the laser displacement meter. [Figure 13] FIG. 13 is an enlarged view of a part of another roll body according to the first embodiment. [Figure 14] FIG. 14 is an enlarged view of a part of another roll body according to the first embodiment. [Figure 15] FIG. 15 is an enlarged view of a part of another roll body according to the first embodiment. [Figure 16] FIG. 16 is an enlarged view of a part of another roll body according to the first embodiment. [Figure 17] FIG. 17 is an enlarged view of a part of another roll body according to the first embodiment. [Figure 18] FIG. 18 is an enlarged view of a part of another roll body according to the first embodiment. [Figure 19] FIG. 19 is an enlarged view of a part of another roll body according to the first embodiment. [Figure 20] FIG. 20 is an enlarged view of a part of another roll body according to the first embodiment. [Figure 21] FIG. 21 is an enlarged view of a part of another roll body according to the first embodiment. [Figure 22] FIG. 22 is an enlarged view of a part of another roll body according to the first embodiment. [Diagram 23] FIG. 23 is a plan view of another roll body according to the first embodiment. [Figure 24] 24 is a cross-sectional view of the roll body shown in FIG. 23 taken along line III-III. [Diagram 25] 25 is a cross-sectional view of the roll body of FIG. 23 taken along line IV-IV. [Figure 26] FIG. 26 is a plan view of another roll body according to the first embodiment. [Figure 27] FIG. 27 is an enlarged view of a portion of a cross section of the VV line in the roll body of FIG. [Figure 28] FIG. 28 is a diagram showing the measurement of the maximum thickness and length of the second intermediate portion shown in FIG. [Figure 29] FIG. 29 is an enlarged view of a part of the cross section taken along line VI-VI of the roll body in FIG. [Diagram 30] 30(A) and 30(B) are diagrams illustrating a manufacturing process of the roll body according to the first embodiment. [Diagram 31] 31(A) and 31(B) are diagrams illustrating a manufacturing process of the roll body according to the first embodiment. [Diagram 32] 32(A) and 32(B) are diagrams illustrating a manufacturing process of the roll body according to the first embodiment. [Diagram 33] FIG. 33 is a diagram illustrating a manufacturing process of the roll body according to the first embodiment. [Diagram 34] FIG. 34 is a perspective view of a roll body according to the second embodiment. [Diagram 35] FIG. 35 is a plan view of the roll body of FIG. [Diagram 36] FIG. 36 is an enlarged view of a part of the cross section taken along line VII-VII of the roll body in FIG. [Figure 37] FIG. 37 is an enlarged view of a part of the cross section taken along line VIII-VIII of the roll body in FIG. [Figure 38] FIG. 38 is an enlarged plan view of a portion of the roll body in FIG. [Figure 39] FIG. 39 is an enlarged view of a portion of another roll body according to the second embodiment. [Diagram 40] FIG. 40 is a plan view of another roll body according to the second embodiment. [Diagram 41] FIG. 41 is an enlarged view of a part of the cross section of the roll body shown in FIG. 40 taken along line IX-IX. [Diagram 42] FIG. 42 is an enlarged view of a part of the cross section of the roll body shown in FIG. 40 taken along line XX. [Diagram 43] FIG. 43 is an enlarged view of a part of the cross section taken along line XI-XI of the roll body in FIG. [Diagram 44] 44(A) and 44(B) are diagrams illustrating a manufacturing process of the roll body according to the second embodiment. [Diagram 45] 45(A) and 45(B) are diagrams illustrating a manufacturing process of the roll body according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0038] [First embodiment] Hereinafter, the roll body according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the roll body according to the first embodiment, FIG. 2 is a plan view of the roll body of FIG. 1, FIG. 3 is an enlarged view of a part of the cross section of the roll body of FIG. 2 taken along line II, FIG. 4 is a view for explaining the dimensions of each component of the roll body of FIG. 1, FIG. 5 is a view showing two regions around the first filled part in the roll body of FIG. 1, FIG. 6 is an enlarged view of a part of the cross section of the roll body of FIG. 2 taken along line II-II, and FIG. 7 is a plan view of a part of the roll body of FIG. 1 enlarged. FIGS. 8 and 9 are enlarged views of a part of another roll body according to this embodiment, and FIG. 10 is a plan view of a sample for identifying a position for measuring an in-plane retardation. FIG. 11 is a plan view of a roll body for identifying a measurement position by a laser displacement meter, and FIG. 12 is an image graph of the displacement amount with respect to the position created based on the measurement by the laser displacement meter. FIGS. 13 to 22 are enlarged views of a part of another roll body according to this embodiment. Fig. 23 is a plan view of another roll body according to the present embodiment, Fig. 24 is a cross-sectional view of the roll body of Fig. 23 taken along line III-III, and Fig. 25 is a cross-sectional view of the roll body of Fig. 23 taken along line IV-IV. Fig. 26 is a plan view of another roll body according to the present embodiment, Fig. 27 is an enlarged view of a portion of the cross section of line VV of the roll body of Fig. 26, Fig. 28 is a view when measuring the maximum thickness and length of the second intermediate portion shown in Fig. 27, and Fig. 29 is an enlarged view of a portion of the cross section of line VI-VI of the roll body of Fig. 36.

[0039] <<<Roll body>>> The roll body 10 shown in Figures 1 and 2 includes a winding core 11 and a long sheet 12 wound around the outer peripheral surface 11A of the winding core 11. As shown in Figure 3, the roll body 10 includes a first filling portion 14 filled in a first gap 13 located between the winding core 11 and the sheet 12, a second filling portion 16 filled in a second gap 15 located between the winding core 11 and the sheet 12, and a fixing member 17 for fixing a part of the sheet 12 to the winding core 11. As shown in Figures 2 and 6, the roll body 10 further includes a pair of first exposure suppression members 18 that suppress the end 14A of the first filling portion 14 in the width direction DR1 of the winding core 11 from being exposed to the outside of the sheet 12, and a pair of second exposure suppression members 19 that suppress the end 16A of the second filling portion 16 in the width direction DR1 of the winding core 11 from being exposed to the outside of the sheet 12.

[0040] The sheet 12 is wound around the core 11 multiple times, for example, two or more times. The roll body 10 may include at least one of the first exposure suppression member 18 and the second exposure suppression member 19, and may not include both. The roll body 10 includes a pair of first exposure suppression members 18, and when the roll body 10 includes the first exposure suppression members 18, it is sufficient that the roll body 10 includes the first exposure suppression member 18 on at least one side. The roll body 10 includes a pair of second exposure suppression members 19, and when the roll body 10 includes the second exposure suppression members 19, it is sufficient that the roll body 10 includes the second exposure suppression member 19 on at least one side.

[0041] 3, the roll body 10 further includes a first intermediate portion 20 that is connected to the first filling portion 14 and is interposed between the first turn of the sheet 12 and the second turn of the sheet 12. Although the roll body 10 includes the first intermediate portion 20 as shown in FIG 3, it does not have to include the first intermediate portion like a roll body 30 shown in FIG 8.

[0042] <<Core>> The shape of the winding core 11 is not particularly limited, but is preferably columnar or cylindrical from the viewpoint of easily winding the sheet 12. The winding core 11 shown in FIG. 1 is cylindrical. When the winding core is cylindrical, the roll body 10 can be held by inserting a chuck member of a winding device into a hole 11B in the width direction DR1 of the winding core 11. The chuck member is a member that is inserted into the hole 11B of the winding core 11 to rotatably fix and hold the roll body 10 relative to the winding device. When the winding core is cylindrical, the winding core has a shaft member that penetrates the winding core, and the roll body can be held by the winding device by attaching the shaft member to the winding device.

[0043] The width W1 of the winding core 11 (see FIG. 2) is not particularly limited, and may be, for example, 0.1 m or more and 50 m or less. The lower limit of the width W1 of the winding core 11 may be 0.2 m or more, 0.3 m or more, 0.7 m or more, 1.0 m or more, 1.5 m or more, or 2 m or more, and the upper limit may be 30 m or less, 20 m or less, 10 m or less, 7 m or less, 5 m or less, 3.5 m or less, 3 m or less, or 2.5 m or less. The width of the winding core can be found by measuring the width of the winding core at 10 points and finding the arithmetic average value of 8 widths excluding the maximum and minimum values ​​among the 10 measured widths.

[0044] The outer diameter of the winding core 11 is not particularly limited, and may be, for example, 30 mm or more and 8000 mm or less. The lower limit of the outer diameter of the winding core 11 may be 90 mm or more or 100 mm or more, and the upper limit may be 5000 mm or less, 3500 mm or less, 2000 mm or less, 1000 mm or less, 700 mm or less, 500 mm or less, 350 mm or less, or 300 mm or less. The outer diameter of the winding core can be obtained by measuring the outer diameter of the winding core at 10 points and calculating the arithmetic average value of the outer diameters at 8 points excluding the maximum and minimum values ​​among the 10 measured outer diameters.

[0045] When the winding core 11 is cylindrical, the inner diameter of the winding core 11 is not particularly limited, and may be 20 mm or more and 7500 mm or less. The lower limit of the inner diameter of the winding core 11 may be 50 mm or more, 80 mm or more, 120 mm or more, or 150 mm or more, and the upper limit may be 4500 mm or less, 3000 mm or less, 1500 mm or less, 900 mm or less, 600 mm or less, 400 mm or less, 250 mm or less, or 200 mm or less. The inner diameter of the winding core can be obtained by measuring the inner diameter of the winding core at 10 points and calculating the arithmetic average value of the inner diameters at 8 points excluding the maximum and minimum values ​​among the 10 measured inner diameters.

[0046] In order to reduce the step caused by the winding start end of the sheet, a step may be formed at the portion of the outer peripheral surface of the winding core where the sheet contacts so that the position of the winding start end of the sheet is closer to the center of the winding core, but such a step is not formed at the portion of the outer peripheral surface 11A of the winding core where the sheet 12 contacts. By using a winding core 11 that does not have a step at the above-mentioned portion of the outer peripheral surface 11A, it is possible to accommodate sheets 12 of various thicknesses. In this specification, "no step is formed at the portion of the outer peripheral surface of the winding core where the sheet contacts" means that there are no parts in the center of the winding core and in each periphery of the portion 100 mm or more away from the center in the width direction of the winding core where the height difference is 3 μm or more. Note that a step with a height difference of less than 3 μm may be formed at the portion of the outer peripheral surface 11A of the winding core where the sheet 12 contacts. When such a step is formed, there is no problem in use and the sheet 12 is easily peeled off from the winding core 11.

[0047] The material constituting the winding core 11 is not particularly limited. Examples of the material constituting the winding core 11 include paper, plastic, and metal. Paper includes paper impregnated with resin. Examples of plastic include fiber reinforced plastics (FRP / Fiber Reinforced Plastics), polyolefins such as polyethylene (PE) and polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), phenolic resin, nylon, and the like. Among these, for example, when performing optical coating processing, fiber reinforced plastics (FRP) are preferred from the viewpoints of weight, processability, and strength. Examples of fiber reinforced plastics include those made of a hybrid of a main body made of epoxy resin or phenolic resin with fibers such as glass, epoxy, polyester, carbon, and aramid. Examples of metals include iron, stainless steel (SUS), and aluminum.

[0048] <<Sheet>> The sheet 12 is long. Specifically, the sheet 12 has a sufficiently small thickness relative to its width and a sufficiently long length.

[0049] The width W2 of the sheet 12 (see FIG. 2) is not particularly limited, and may be, for example, 0.1 m or more and 50 m or less. In this specification, the "width of the sheet" means the length of the sheet in the short direction (width direction of the core). The lower limit of the width W2 of the sheet 12 may be 0.2 m or more, 0.3 m or more, 0.5 m or more, 1.0 m or more, or 2.0 m or more, and the upper limit may be 30 m or less, 20 m or less, 10 m or less, 7 m or less, 5 m or less, 3.5 m or less, or 3 m or less. The width of the sheet can be obtained by measuring the width of the sheet at 10 points and calculating the arithmetic average value of the widths at 8 points excluding the maximum and minimum values ​​among the 10 measured widths.

[0050] It is preferable that the width W2 of the sheet 12 is smaller than the width W1 of the core 11. This allows the sheet 12 to be reliably held by the core 11. For example, it is preferable that the width W2 of the sheet 12 is smaller than the width W1 of the core 11 by about 1 mm to 50 mm, since this reduces the unused portion and allows for efficient collection when the product is surfaced. The lower limit of this difference may be 1 mm or more, 20 mm or more, or 50 mm or more, and the upper limit may be 70 mm or less, 40 mm or less, or 25 mm or less.

[0051] The length of the sheet 12 may be, for example, 20 m or more and 10,000 m or less. In this specification, the "length of the sheet" refers to the length of the sheet in the longitudinal direction DR2 (see FIG. 3). The lower limit of the length of the sheet 12 may be 30 m or more, 40 m or more, or 50 m or more, and the upper limit may be 9,000 m or less or 8,000 m or less.

[0052] The thickness of the sheet 12 is not particularly limited, but may be, for example, 3 μm or more and 600 μm or less. The lower limit of the thickness of the sheet 12 may be 10 μm or more, 15 μm or more, 20 μm or more, or 30 μm or more, and the upper limit may 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. This is not limited when a thin film is preferred depending on the application, and 3 μm or more and less than 50 μm, and further 40 μm or less are preferable. The thickness of the sheet can be obtained by measuring the thickness of the sheet at 10 points and calculating the arithmetic average value of the thicknesses at 8 points excluding the maximum and minimum values ​​among the thicknesses measured at 10 points. Note that the above-mentioned step is unlikely to occur when the sheet is thick, but becomes more noticeable as the thickness becomes thinner. The present invention is particularly effective when the sheet is thin (80 μm or less, less than 50 μm, and further 40 μm or less).

[0053] When the sheet 12 contains, for example, an acrylic resin, a polyester resin (particularly, polyethylene terephthalate), or a cycloolefin polymer resin, the thickness of the sheet 12 is preferably 15 μm or more and 300 μm or less. When the sheet 12 contains any of these resins, the step becomes more prominent as the sheet becomes thinner, but when the sheet is made extremely thin, the step tends to become smaller. For example, when a heating process of 50° C. or more is performed in the subsequent process, the deformation due to the step may be eliminated if the sheet is thin. However, when the sheet has a certain thickness (for example, 15 μm or more), the deformation may not be eliminated even if the heating process is performed. For this reason, it is particularly effective when the thickness of the sheet 12 is 15 μm or more. Also, when the sheet 12 contains any of these resins, if the sheet is too thick, a large amount of coating material is required. For this reason, from the viewpoint of cost reduction, the thickness of the sheet 12 is preferably 300 μm or less. Furthermore, when any of these resins is included, a step may not easily occur if the thickness exceeds 300 μm. When the sheet 12 includes 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. When any of these resins is included, it is particularly effective when the thickness is neither too thin nor too thick.

[0054] When the 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, the physical properties of glass can be maintained, and if the thickness is 100 μm or less, it is easy to wind up into a roll. The lower limit of the thickness of the glass film may be 10 μm or more, 15 μm or more, or 20 μm or more from the viewpoint of being less likely to crack and being less likely to break even if microcracks are generated. Moreover, the upper limit of the thickness of the glass film may be 40 μm or less, 30 μm or less, or 25 μm or less from the viewpoint of making it longer or thinner.

[0055] When the sheet 12 is paper, which will be described later, the thickness of the paper is preferably 50 μm or more and 110 μm or less. If the thickness of the paper is 50 μm or more, the strength can be ensured over the long term, and if the thickness is 110 μm or less, the paper can be easily wound into a roll. From the viewpoint of ease of handling in the process, the lower limit of the thickness of the paper may be 50 μm or more, 60 μm or more, or 70 μm or more. Also, from the viewpoint of lengthening the roll, the upper limit of the thickness of the paper may be 100 μm or less, 90 μm or less, or 80 μm or less.

[0056] Furthermore, when the fixing member 17 is provided, the sheet 12 is placed on the fixing member 17, so the total thickness of the sheet 12 and the fixing member 17 affects the step caused by the roll start end of the sheet. Therefore, for example, assuming that the thickness of the fixing member 17 is 3 μm or more and 10 μm or less, it is preferable that the thickness of the sheet 12 is thin, so the upper limit is preferably 130 μm or less, and further preferably 90 μm or less. Furthermore, when the fixing member is an adhesive tape, if the thickness of the fixing member exceeds 15% of the thickness of the sheet, the effect on the step is more likely to occur. Therefore, it is better that the thickness of the sheet 12 is not 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.

[0057] Examples of the sheet include films, metal foils, and paper (e.g., wallpaper). The film may be, for example, a resin film or a glass film. In this specification, the term "glass film" refers to a glass substrate having flexibility that can be wound into a roll. When a resin film or a glass film is used for an application requiring light transmittance (e.g., an optical film application), the resin film or the glass film is preferably light transmittance. The resin constituting such a resin film is not particularly limited as long as it has light transmittance, and examples thereof include acrylic resins, polyolefin resins (polyethylene resins, polypropylene resins, cycloolefin polymer resins), polycarbonate resins, polyacrylate resins, polyester resins (polyethylene terephthalate, polyethylene naphthalate, etc.), aromatic polyether ketone resins, polyether sulfone resins, acetyl cellulose resins (e.g., triacetyl cellulose resins), polyimide resins, polyamideimide resins, polyamide resins, or mixtures of two or more of these resins. Among these, resin films with relatively high flexibility, such as resin films containing acrylic resins, polyolefin resins, polyester resins, acetyl cellulose resins, polyimide resins, polyamideimide resins, or polyamide resins, are easily deformed due to steps caused by the beginning end of the sheet or steps caused by the fixing member, and therefore the technology of the present invention is effective. Furthermore, in recent years, low moisture permeable resins with little distortion and low moisture permeability have been preferred for use in large displays. In the case of large displays, the entire width of the sheet is often the product, so if there is any deformation due to steps, the entire sheet must be discarded. For example, acrylic resins, polyester resins, and cycloolefin polymer resins are preferably used in large displays, but the technology of the present invention can effectively prevent deformation due to steps and improve mass productivity, so the technology of the present invention is particularly effective for sheets made of these resins. Furthermore, when thinness is required in the final product, for example, when a film with a thickness of less than 50 μm is used, the technology of the present invention is suitable for any film material.

[0058] 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 may be 1 nm or more and 20000 nm or less. When the sheet 12 is used as an optical film, particularly when it contains an acrylic resin or a cycloolefin polymer resin, the in-plane phase difference Re of the sheet 12 is preferably 10 nm or less. The in-plane phase difference Re of the sheet 12 being 10 nm or less means that the optical distortion is small, and it can be said that there is almost no residual stress during the manufacture of the sheet 12. In other words, it is preferable that the in-plane phase difference Re of the sheet 12 is 10 nm or less because the polymer in the sheet 12 is uniform, and therefore when the sheet 12 is rolled into a long roll, new steps due to the polymer state inside the sheet 12 are unlikely to occur. The upper limit of the in-plane phase difference Re of the sheet 12 is more preferably 8 nm or less, or 4 nm or less, from the viewpoint of preventing color unevenness and blackout, which are issues when used in combination with a polarizer in display applications. In the case of acrylic resins, for optical applications, it is preferable that the film does not turn white when bent as occurs with conventional acrylic resin films, and that the haze value (total haze value) is small, such as 1% or less or 0.5% or less.

[0059] In addition, when the sheet 12 is used as an optical film and contains a polyester resin, it is preferable that the polymer in the sheet 12 is uniform, as described above, since new steps due to the internal polymer state are unlikely to occur. When the sheet 12 contains a polyester resin, stretching is essential to obtain physical strength, so in order to make the polymer state as uniform as possible, it is preferable to manufacture the sheet by sequential or simultaneous biaxial stretching at approximately the same magnification in the length and width directions. As a result, a sheet containing a polyester resin with a smaller in-plane retardation than conventional sheets is obtained. This small in-plane retardation means that the sheet has a thickness of 10 μm to 90 μm and an in-plane retardation of 1500 nm or less, preferably 1200 nm or less, more preferably 1000 nm or less, and even more preferably 800 nm or less. In order to improve the physical properties such as the elastic modulus and tear strength of the biaxially stretched polyester as a plastic film, it is better that the in-plane retardation is not too small, and it is preferably 200 nm or more, and more preferably 400 nm or more.

[0060] In order to further improve the physical properties, it is better to consider the balance between the birefringence in the in-plane direction and the birefringence in the thickness direction. The Nz coefficient is an index for this. The Nz coefficient is affected by the crystallinity and orientation inside the film, and is therefore related to the properties of the entire sheet. For example, in the case of polyethylene terephthalate, the Nz coefficient is usually 2 to 4, but in particular when it is made into a long roll, it is preferably 5 or more, more preferably 8 or more, and most preferably 10 or more, in that new steps due to the polymer state in the sheet are unlikely to occur. The upper limit of the Nz coefficient is about 80, preferably 70 or less, and most preferably 50 or less.

[0061] The in-plane retardation (Re) is expressed by the following formula (1) using the refractive index nx in the slow axis direction, which is the direction in the sheet plane that has the largest refractive index, the refractive index ny in the fast axis direction, which is the direction perpendicular to the slow axis direction in the plane, and the thickness t (nm) of the sheet. From the following formula (1), it can be seen that a small in-plane retardation tends to improve bending resistance because of a low degree of orientation. The in-plane retardation (Re) can be measured, for example, using a product name "RETS-100" manufactured by Otsuka Electronics Co., Ltd. In-plane phase difference (Re)=(nx-ny)×t…(1)

[0062] The Nz coefficient is expressed by the following formula (2) using the refractive index nz in the thickness direction of the sheet, the above nx, and the above ny. Nz coefficient=(nx-nz) / (nx-ny) …(2)

[0063] When measuring the above Re using the RETS-100, the following procedure can be followed. First, in order to stabilize the RETS-100 light source, leave it for 60 minutes or more after turning on the light source. After that, select the rotating analyzer method and the θ mode (angle direction phase difference measurement mode). By selecting this θ mode, the stage becomes a tilted rotating stage.

[0064] Next, the following measurement conditions are entered into the RETS-100. (Measurement conditions) Retardation measurement range: Rotating analyzer method Measurement spot diameter: φ5mm Tilt angle range: -40°~40° Measurement wavelength range: 400nm~800nm The average refractive index of the sample (for example, N=1.617 for PET, and 1.5 for acrylic resin film). Thickness: Thickness measured separately using SEM or optical microscope

[0065] Background data is then obtained without placing a sample in the instrument, the instrument is closed, and this is done every time the light source is turned on.

[0066] Thereafter, a sample is placed on a stage in the apparatus. The shape of the sample may be any shape, for example, rectangular. The size of the sample may be 50 mm x 50 mm. However, the sample is cut from a portion of the sheet that is 35 mm or more away from each end of the sheet toward the inside of the sheet (for example, the center of the sheet). When there are multiple samples, they must all be placed in the same orientation. For example, it is preferable to mark all the samples in advance so that they are all placed in the same orientation.

[0067] After placing the sample, rotate the stage 360° on the XY plane in an environment with a temperature of 23±5°C and a relative humidity of 50±20% to measure the fast axis and slow axis. After the measurement is completed, select the slow axis. Then, the measurement is performed while the stage is tilted in a set angle range around the slow axis, and data (Re) is obtained in 10° increments for the set tilt angle range and set wavelength range. The in-plane retardation Re is the value measured with an incident angle of 0° and light with a wavelength of 589 nm. The in-plane retardation Re is measured at five different points. Specifically, first, draw two orthogonal imaginary lines IL1 and IL2 passing through the center A1 of the sample SA as shown in FIG. 10. When these imaginary lines IL1 and IL2 are drawn, the sample is divided into four sections. Then, set one point equidistant from the center A1 in each section, a total of four points A2 to A4, and measure the center A1 and the points A2 to A4 in total, five points. Of the five measured values, the arithmetic average value of three values ​​excluding the maximum and minimum values ​​is determined as the in-plane retardation Re.

[0068] The sheet 12 may have a single layer structure, or may have a laminate structure in which two or more layers are laminated. Specifically, the sheet 12 may be a substrate alone or a functional layer alone, or may be, for example, a laminate in which one or more functional layers are formed on a substrate (for example, an optical laminate). Some substrates have an underlayer formed on one or both sides of the substrate for easy adhesion. The term "substrate" in this specification includes not only those that do not have an underlayer, but also those that have an underlayer on one or both sides of the substrate. That is, in this specification, when an underlayer is formed on the substrate, the laminate of the substrate and the underlayer is the substrate. However, the underlayer in this case is the underlayer in contact with the substrate, and does not include the underlayer that is not in contact with the substrate. The thickness of the underlayer is usually 0.01 μm or more and 1.0 μm or less. In addition, the term "functional layer" in this specification is a layer intended to exert some function in the laminate. Specifically, examples of the functional layer include an undercoat layer not in contact with the substrate, a hard coat layer, an impact absorbing layer, an anti-glare layer, an antistatic layer, a conductive layer, a heat dissipation layer, an ultraviolet absorbing layer, a special wavelength absorbing layer, a special wavelength transmitting layer, a color reproducibility improving layer, a liquid crystal layer, a phase difference adjusting layer, a viewing angle adjusting layer, a reflective layer, a colored layer, an anti-reflection layer (high refractive index layer, low refractive index layer), an antifouling layer, a water repellent layer, an oil repellent layer, and the like, or a combination thereof. The "functional layer" in this specification may be a single layer structure or a laminated structure. However, in this specification, the "functional layer" refers to a layer that exists even when the sheet 12 is used, and does not include a release liner that is peeled off during use. If a release liner is present in the sheet, defects are likely to occur and new steps different from the above steps are likely to occur. If a release liner is provided on the sheet 12, the sheet is wound around the core 11 with the release liner peeled off.

[0069] The uses of the sheet 12 are not particularly limited, and examples thereof include optical uses (optical film uses, polarizing plate uses, display device uses), fittings uses, automotive interior decoration uses, battery component uses, food packaging uses, agricultural uses, cosmetic uses, design uses, medical uses, etc. Among these, films for optical uses may have an effect not only on the appearance but also on the light transmittance if there is a step caused by the roll start end of the sheet or a step caused by a fixing member, so the technology of the present invention is particularly effective for optical uses.

[0070] The sheet 12 has a winding start end 12A (see FIG. 3) and a winding end 12B (see FIG. 1). In the roll body 10, the winding start end 12A is located closer to the winding core 11 than the winding end 12B. In the roll body 10, as shown in FIG. 3, a tip end surface 12A1 located in the longitudinal direction DR2 of the winding start end 12A is substantially aligned with a second end surface 17B (described later) of the fixing member 17 in the radial direction DR3 of the winding core 11 (the normal direction of the outer circumferential surface 11A of the winding core 11). In this specification, "substantially aligned" means that the distance between the tip end surface 12A1 and the second end surface 17B in the longitudinal direction DR2 of the winding start end 12A is within ±20% of the width W3 (see FIG. 4) of the fixing member 17. Note that the above "+" means that the tip face 12A1 protrudes further than the second end face 17B, and the above "-" means that the tip face 12A1 is recessed further than the second end face 17B (i.e., the second end face 17B protrudes further than the tip face 12A1).

[0071] <<Fixing parts>> The fixing member 17 is for fixing a part of the sheet 12 to the outer peripheral surface 11A of the winding core 11. The fixing member 17 extends in the width direction DR1 of the winding core 11. This allows a part of the sheet 12 to be fixed to the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11.

[0072] Fixed member 17 has a first end face 17A and a second end face 17B opposite first end face 17A. First end face 17A and second end face 17B both extend in width direction DR1 of winding core 11. Second end face 17B is located closer to winding-start end 12A than first end face 17A.

[0073] In Fig. 3, the fixing member 17 is in close contact with the outer peripheral surface 11A of the winding core 11 and the winding start end 12A of the sheet 12, and fixes the winding start end 12A of the sheet 12 to the outer peripheral surface 11A of the winding core 11. Note that, in the first turn of the sheet 12, the sheet 12 may be fixed at a portion other than the winding start end 12A. In Fig. 3, the entire surface of the fixing member 17 is in close contact with the winding start end 12A, but as long as the winding start end 12A is fixed to the fixing member 17 to an extent that does not cause problems during winding, for example, to an extent that the winding start end 12A does not peel off from the fixing member 17 during winding, as in the case of a roll body 40 shown in Fig. 9, the first filling portion 14 and the first exposure suppression member 18 may be inserted between the winding start end 12A and the fixing member 17.

[0074] The fixing member 17 is not particularly limited, but examples thereof include an adhesive member and a pressure sensitive adhesive member such as a double-sided tape. The fixing member 17 may have elasticity (cushioning properties). The pressure sensitive adhesive member has pressure sensitive adhesive properties on both sides.

[0075] The width W3 of the fixing member 17 (see FIG. 4) 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 part of the sheet 12 can be reliably fixed to the outer peripheral surface 11A of the winding core 11, and if it is 100 mm or less, the sheet 12 can be wound without causing wrinkles in the sheet 12. In this specification, the "width of the fixing member" means 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.

[0076] 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, it is possible to reliably fix a part of the outer peripheral surface 11A of the winding core 11, and if it is 600 μm or less, it is possible to further suppress deformation of the sheet 12. 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 found by measuring the thickness of the fixing member at 10 points and calculating the arithmetic average value of the thicknesses at the 10 points.

[0077] <First Gap> The first gap 13 is a gap in contact with the leading end surface 12A1 located in the longitudinal direction DR2 of the winding starting end 12A. Specifically, the first gap 13 shown in Fig. 3 is a gap surrounded by the outer peripheral surface 11A of the winding core 11, the back surface 12C of the first turn of the sheet 12, the leading end surface 12A1 of the winding starting end 12A, and the second end surface 17B of the fixing member 17. If the fixing member 17 is not provided, the first gap is a gap surrounded by the outer peripheral surface of the winding core, the back surface of the first turn of the sheet, and the leading end surface of the winding starting end.

[0078] The first gap 13 is a gap that contacts the tip end surface 12A1, is located between the winding core 11 and the first turn of the sheet 12, and is also a gap that contacts the second end surface 17B, and is therefore also a third gap, which will be described later.

[0079] <Second gap> The second gap 15 is a gap in contact with the first end surface 17A of the fixing member 17. Specifically, the second gap 15 shown in FIG.

[0080] <First filling section> The first filling portion 14 is filled in the first gap 13. That is, the first filling portion 14 contacts the outer peripheral surface 11A of the winding core 11, the back surface 12C of the first turn of the sheet 12, the tip surface 12A1 of the winding start end 12A, and the second end surface 17B of the fixing member 17. If the fixing member 17 is not provided, the first filling portion contacts the outer peripheral surface of the winding core, the back surface of the first turn of the sheet, and the tip surface of the winding start end. In this specification, "filled" means that the gap is generally filled with the material that constitutes the filling portion. However, there may be voids inside the filling portion.

[0081] The sheet 12 has an effective region R1 (see FIG. 2) that is used as a product, and non-effective regions R2 (see FIG. 2) that are located on both sides of the effective region R1 in the width direction DR1 of the core and are not used as a product, and the first filling portion 14 is present at least in the effective region R1. Since the effective region R1 is an area that is used as a product, it is preferable that the first filling portion 14 is present in the entire effective region R1 in the width direction DR1 of the core 11. Note that the non-effective region R2 is an area that is not used as a product in the first place, and there is no need to reduce the step, so there is no problem even if the first filling portion 14 is not present in the non-effective region R2. The non-effective region R2 varies depending on the use of the sheet and the width of the sheet, but is usually an area within 10 mm to 30 mm on the inside from both ends in the width direction of the sheet.

[0082] The edge thickness T1 (see FIG. 4) of the tip 14B on the side of the separation position P1 where the first round sheet 12 separates from the core 11 in the first filling section 14 is preferably thin because a thicker thickness may cause a new step to be formed due to the thickness. Specifically, for example, the edge thickness T1 is preferably 50 μm or less. The edge thickness T1 is preferably 30 μm or less, 20 μm or less, 10 μm or less, 5 μm or less, or even 2 μm or less in order to shorten the deformation relaxation length, which is the distance from the winding start end 12A to the point where the deformation due to the step at the winding start end 12A becomes unnoticeable. The more the step due to the winding start end is relaxed, the more the deformation of the sheet due to this step is relaxed, and therefore the deformation relaxation length becomes shorter. In this specification, the "deformation relaxation length" is sometimes used to mean the length until the sheet deformation due to the step due to the winding start end is relaxed, in addition to the length until the sheet deformation due to the step due to the fixing member becomes unnoticeable. When the deformation relaxation length is used to mean the length until the sheet deformation due to the step caused by the fixing member becomes unnoticeable, the deformation relaxation length is the distance from the winding start end 12A to the point where the deformation due to the step of the fixing member 17 becomes unnoticeable. The deformation relaxation length is preferably short, and specifically, it is preferably 100 m or less, 75 m or less, 60 m or less, 50 m or less, 35 m or less, 20 m or less, or 15 m or less. Note that if the deformation relaxation length is 75 m or less, it is favorable because it increases the portion where the sheet deformation is unnoticeable. As described above, the deformation relaxation length is the length until the sheet deformation due to the step becomes unnoticeable, but whether or not a step exists is judged as follows. First, in an indoor environment of 800 Lux to 2000 Lux, a white light source tube such as a white LED lamp or white phosphor (for example, a 40W straight tube LED (power consumption 18W, total luminous flux 3100Lm, color temperature 5000K)) is reflected onto a long sheet, and if there are any parts where the outline of the white light source tube reflected on the sheet is distorted compared to other parts of the sheet, it is determined that a step exists, and if there are any parts around the step where the outline of the white light source tube reflected can be determined to be the same as the other parts of the sheet, it is determined that no step exists.The white light source tube is arranged so that its longitudinal direction is along the longitudinal direction of the sheet. The length of the white light source tube can be changed depending on the width and length of the sheet. Specifically, the length of the white light source tube is preferably set to a length that spans the portion of the sheet where the step exists and the portion where the step does not exist. This makes it easier to see the portion where the step exists. In addition, if the observation environment has the above-mentioned brightness, the white light source tube itself may be turned on or off. During observation, it is important that the white light source tube is reflected in the sheet and its contour line is visible. For this reason, as the observation condition, the one where the contour line of the white light source tube is clearly visible is appropriately selected. For example, if the contour line of the white light source tube is easier to see on the back side of the sheet than on the front side of the sheet, the white light source tube may be reflected on the back side of the sheet to check whether there is a step. Specifically, for example, in the case of a laminate in which a functional layer in which the white light source tube is not easily reflected, such as an antiglare layer, is laminated on the front side of the substrate, it may be difficult to check whether there is a step when observed from the antiglare layer side. Therefore, in this case, it is advisable to project a white light source tube onto the back side of the substrate on which the antiglare layer is not laminated, and check whether there is a step. This judgment can also be used for roll bodies for various applications, such as a laminate in which one or more functional layers are laminated on a substrate, or a laminate in which the laminate is attached to a polarizer. For example, when an antiglare layer is laminated on a substrate as a functional layer, it is possible to judge whether there is a step by checking that the uneven shape that exerts the antiglare function is crushed by pressure and appears colored, such as a shadow. In addition, when various functional layers are laminated and it is difficult to project a white light source tube onto the visible side or the opposite side of the roll body, it is possible to judge whether there is a step by checking that a color different from other parts is visible due to a shadow or the like caused by a change in shape as described above.

[0083] Furthermore, when the sheet 12 is a thin film having a thickness of 3 μm or more but less than 50 μm, it is more susceptible to the step caused by the winding start end 12A than when the thickness is thicker, so when such a thin film is used, the edge thickness T1 is preferably 10 μm or less, and from the viewpoint of shortening the deformation relaxation length, it is more preferably 7 μm or less, 5 μm or less, or even 1 μm or less. The lower limit of the edge thickness T1 may be 0.1 μm or more, 0.3 μm or more, or 0.5 μm or more.

[0084] From the viewpoint of minimizing the deformation relaxation length, the edge thickness T1 is preferably the above-mentioned thickness, but the surface of the core may be surface-finished and have unevenness. At the tip of the first filling part, the material constituting the first filling part is embedded along the unevenness, so there is a risk of unevenness occurring, with some parts having the edge thickness T1 and others not having it. However, if the edge thickness T1 is thin, even if such unevenness occurs, there is no real harm. For this reason, when unevenness exists and causes unevenness, it is preferable that the edge thickness T1 is thin, and 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. In this case, the lower limit of the edge thickness T1 may be 0.1 μm or more, 0.3 μm or more, or 0.5 μm or more.

[0085] On the other hand, there is also an effect due to the presence of the edge thickness T1. For example, the winding core is often reused after the use of the roll body. For this reason, the winding core is required to have reworkability, in which the filling part in contact with the winding core, such as the first filling part, is peeled off from the winding core or removed by cleaning or wiping to reuse the winding core. For this reason, for example, the first filling part 14 is preferably not bonded to the winding core 11, as described later. In addition, in the portion where the first filling part 14 is in contact with the winding core 11 and the sheet 12, it is preferable that the sheet 12 can be peeled off cleanly from the first filling part 14. If the first filling part 14 undergoes cohesive failure when the sheet 12 is peeled off from the first filling part 14, it may be difficult to peel off the entire first filling part 14 cleanly from the winding core 11. On the other hand, if the edge thickness T1 exists, it may trigger the peeling off of the sheet 12, so from the viewpoint of reworkability, it is preferable to intentionally have the edge thickness T1 exist. For example, from the viewpoint of reworkability, the edge thickness T1 is preferably 5 μm or more. The preferred thickness of this edge thickness T1 varies depending on the material of the core and the sheet, and the edge thickness T1 may be 1.5 μm or more, or even 5 μm or more. The upper limit of the edge thickness is preferably 30 μm or less, since there is a risk of new steps being formed due to the thickness.

[0086] The edge thickness T1 can be measured using a scanning optical interference surface profiler, such as the "New View" series manufactured by Zygo.

[0087] Specifically, the edge thickness T1 can be obtained as follows using a scanning optical interference surface profiler (product name "New View7300", manufactured by Zygo). First, when the entire sheet is unwound, the first filling portion 14 may adhere to the sheet 12 side and peel off from the core. If the first filling portion 14 adheres to the unwound sheet 12 side, one or more samples having a size of 0.5 mm square or more including the tip portion 14B of the first filling portion 14 are obtained from the sheet. The sample is not limited to a square, but may be a rectangle (e.g., 2 mm x 5 mm) as long as it is 0.5 mm square or more. The sample is cut out from any location that includes the first filling portion 14 and is free of dirt, fingerprints, etc. Then, the edge thickness T1 of the first filling portion 14 is measured under the following measurement conditions. The edge thickness T1 can be obtained by measuring the edge thickness at 10 locations and calculating the arithmetic average value of the thicknesses at 8 locations excluding the maximum and minimum values ​​among the 10 measured locations. (Measurement conditions) Objective lens: 10x ·Zoom: 1x ·Measurement area: 2.17mm x 2.17mm Scan Length: 5μm min mod:0.015

[0088] The thickness T2 (see FIG. 4) at the position in contact with the tip surface 12A1 of the first filling portion 14 is preferably thicker than the sum of the thicknesses of the fixing member 17 and the sheet 12 when the fixing member 17 is present, and is preferably thicker than the thickness of the sheet 12 when the fixing member 17 is not present. By setting the thickness T2 to such a thickness, the step caused by the winding start end 12A can be more effectively alleviated. However, if the thickness T2 is too thick, the step caused by the winding start end 12A can be alleviated, but it may have an adverse effect on the winding of the sheet 12. For this reason, 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, and more preferably 52 μm or more and 150 μm or less, and 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.

[0089] The thickness T2 at the position of the first filling portion 14 in contact with the tip surface 12A1 can be measured as follows. The measurement method for the thickness T2 may be different depending on whether the first intermediate portion 20 is present or not. When the first intermediate portion 20 is not present, the thickness T2 can be measured using a laser displacement meter or a stereo microscope, and when the first intermediate portion 20 is present, the thickness T2 can be measured using a stereo microscope. The measurement of the thickness T2 using the laser displacement meter or the stereo microscope is performed in an environment with a temperature of 23±5° C. and a relative humidity of 50±20%.

[0090] The thickness T2 can be measured by a laser displacement meter as follows. The following measurement method utilizes the reflection of laser light, and is therefore particularly effective when the sheet 12 is transparent and the first filling portion is not transparent (for example, colored). First, a jig for rotating the roll body 10 and a laser displacement meter (for example, product name "LK-G30" manufactured by Keyence Corporation) are prepared and placed at predetermined positions. The jig is inserted into the hole 11B in the width direction DR1 of the core 11 and is configured to rotatably hold the roll body 10. Note that, although the LK-G30 is given as the laser displacement meter, an equivalent laser displacement meter such as a successor model may be used instead of the LK-G30.

[0091] The laser displacement meter is equipped with a laser light source and a light receiving element, and is a device that can measure displacement based on the position at which laser light is received by the light receiving element after it is irradiated from the laser light source and reflected off the surface of the first filling section 14.

[0092] The laser displacement gauges are positioned above the roll body 10, and three of them are arranged so that the laser light is irradiated toward the surface of the roll body 10. The locations of the laser displacement gauges are as follows. First, as shown in FIG. 11, a first position B1 and a second position B2 that divide the width of the sheet 12 into thirds are determined. The first position B1 is located on the first end 12G1 side in the width direction of the sheet 12 (width direction DR1 of the core 11), and the second position B2 is located on the second end 12G2 side opposite to the first end 12G1. The first laser displacement gauge is arranged so that the laser light is irradiated to a midpoint C1 between the first position B1 and the first end 12G1, the second laser displacement gauge is arranged so that the laser light is irradiated to a midpoint C2 between the first position B1 and the second position B2, and the third laser displacement gauge is arranged so that the laser light is irradiated to a midpoint C3 between the second position B2 and the second end 12G2.

[0093] Then, the roll body 10 is attached to a jig, and the sheet 12 is unwound until the first filling portion 14 is exposed from the roll body 10. Thereafter, while the first filling portion 14 is exposed, the core 11 is rotated at a rotation speed of 30 mm / s, and the displacement is continuously measured with a laser displacement meter at a sampling period of 200 μs to obtain a graph (see FIG. 12) with the horizontal axis representing the position (mm) and the vertical axis representing the displacement (mm). This measurement is performed from the tip 14B of the first filling portion 14 to the position where it contacts the tip surface 12A1, and in this measurement, the reference height (0 mm displacement line) is the height of the core 11, and the difference between the reference height and the displacement of the first filling portion 14 is the thickness of the first filling portion 14. In addition, in this graph, one division on the horizontal axis is 5 mm, and one division on the vertical axis is 0.02 mm.

[0094] In this graph, the amount of displacement increases from tip 14B where first filling portion 14 exists, but the amount of displacement drops sharply after the position where first filling portion 14 contacts tip surface 12A1. Therefore, position E1 on the position displacement curve where the amount of displacement starts to drop sharply is found in the graph. Then, the thickness T2 of first filling portion 14 at the position where it contacts tip surface 12A1 is found by calculating the difference between the displacement amount 0 mm line and the displacement amount at position E1.

[0095] The thickness T2 can be measured using a stereo microscope as follows. First, the portion including the winding start end 12A, the first filling portion 14, and the second turn of the sheet 12 is sampled and fixed so as not to crush this portion. Then, the cross section of this fixed portion is polished, and the thickness T2 of the first filling portion 14 is measured using a stereo microscope (for example, product name "Digital Microscope VHX-7000" manufactured by Keyence Corporation). Note that, although the digital microscope VHX-7000 is given as the stereo microscope, a similar stereo microscope such as a successor model may be used instead of the VHX-7000.

[0096] The first filling section 14 preferably contains a coloring material or a luminescent material. When the first filling section 14 contains a coloring material or a luminescent material, it is easy to visually check if the first filling section 14 protrudes from the roll body 10. In addition, it is easy to check the thickness, length, etc. of the first filling section 14.

[0097] When the first filling section 14 is colored, the color of the first filling section 14 is not particularly limited, but from the viewpoint of ensuring that the presence of the first filling section 14 can be grasped and that any components of the first filling section 14 that adhere to the winding device are not noticeable, white, gray, or the like is preferable.

[0098] When the first filling section 14 is colored, the first filling section 14 contains a coloring material. When the first filling section 14 is a cured product of a coating material, it is preferable that the coloring material does not inhibit the curing. The coloring material may be either a pigment or a dye, and may be either an organic coloring material or an inorganic coloring material. Specific examples of the coloring material include titanium oxide, carbon black, or a mixture thereof.

[0099] When first filling portion 14 is colored, the content of the coloring material in first filling 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, first filling portion 14 can be visually confirmed, and if the content is 50% by mass or less, the reworkability of first filling portion 14 can be maintained well even if the coloring material is an inorganic material or an organic material.

[0100] When the first filling section 14 contains a luminescent material, the luminescent material is not particularly limited, but may be a fluorescent material or a phosphorescent material. When the first filling section 14 contains a fluorescent material or a phosphorescent material, the fluorescent material or the phosphorescent material in the first filling section 14 can be made to emit light by irradiating the first filling section 14 with light such as ultraviolet light or visible light.

[0101] The shape of the surface 14C (see FIG. 5) of the first filling portion 14 is preferably upwardly convex. If the shape of the surface 14C is upwardly convex, the sheet 12 can be lifted more than if the shape is downwardly concave, and the above-mentioned step can be alleviated. Whether the shape of the surface 14C is upwardly convex can be determined from the graph of the position displacement curve, as with the thickness T2. Specifically, first, in the above graph, the position where the first filling portion 14 exists is higher than the height of the winding core 11, so the displacement amount increases. The position E2 (see FIG. 12), which is the intersection of the displacement amount 0 mm line and the position displacement curve at the point where the displacement amount starts to increase, is identified. Then, an imaginary line IL3 (see FIG. 12) passing through the positions E1 and E2 is drawn. If the ratio of the number of peaks located above the imaginary line IL3 among the number of peaks of the position displacement curve existing between the positions E1 and E2 is 50% or more, the shape of the surface 14C of the first filling portion 14 can be determined to be upwardly convex, and if the ratio of the number of peaks located below the imaginary line IL3 among the number of peaks of the position displacement curve existing between the positions E1 and E2 is 50% or more, the shape of the first filling portion 14 can be determined to be downwardly concave. Note that if the imaginary line IL3 and the position displacement curve overlap, it is determined to be downwardly concave. In the graph for determining the shape of the first filling portion 14, one division on the horizontal axis is 5 mm and one division on the vertical axis is 0.02 mm.

[0102] When the shape of the surface 14C of the first filling portion 14 is upwardly convex, the average distance D1 from the virtual line IL3 to the position displacement curve in the vertical 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, so that the above-mentioned step can be further alleviated. The lower limit of this average distance D1 is more preferably 0.01 mm or more. The upper limit of the average distance D1 is preferably 0.1 mm or less, and even more preferably 0.07 mm or less, because an excessively convex shape may cause a new step. The above-mentioned average distance D1 is obtained by taking the virtual line IL3 as a reference point, reading seven peaks that are upwardly convex from this virtual line IL3, and averaging the values ​​of the five points excluding the maximum and minimum values. The peak to be read is a mountain portion, and the large part is selected.

[0103] The inclination of the virtual line IL3 with respect to the horizontal axis of the graph 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 this inclination is 0.0050 or more, the coating material can be filled without being depressed, and if it is 0.0060 or less, the coating material can be filled without being significantly convex. The lower limit of this inclination 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.

[0104] It is preferable that the thickness of the first filling portion 14 gradually increases from the vicinity of the separation position P1 toward the tip surface 12A1. By changing the thickness of the first filling portion 14 in this way, a sudden change in height of the sheet 12 in the radial direction DR3 of the winding core 11 (the normal direction to the outer circumferential surface 11A) can be suppressed, and therefore a step caused by the winding start end portion 12A can be mitigated.

[0105] If the thickness of the first filling part changes suddenly, the deformation caused by the thickness change part may remain, and the step caused by the winding start end may not be sufficiently alleviated. For this reason, it is preferable to ensure a sufficient length of the first filling part relative to the thickness of the sheet. However, if the length of the first filling part is increased, and other effects such as winding occur, the length of the first filling part may be intentionally shortened from the optimal state, so that the deformation relaxation length is longer than the state in which the first filling part has the optimal length, but the deformation relaxation length can be shorter than if the first filling part is not provided. Therefore, when the first intermediate part 20 is present as shown in FIG. 4, it is preferable that the ratio ((length L1 + length L2) / thickness T2) of the sum of the length L1 (see FIG. 4) of the first filling part 14 along the longitudinal direction DR2 of the sheet 12 (see FIG. 4) and the length L2 (see FIG. 4) of the first intermediate part 20 along the longitudinal direction DR2 of the sheet 12 to the thickness T2 at the position of the first filling part 14 in contact with the tip surface 12A1 is 90 or more. 8, when the first intermediate portion 20 does not exist, the ratio (length L1 / thickness T2) of the length L1 (see FIG. 8) of the first filling portion 14 along the longitudinal direction DR2 of the sheet 12 to the thickness T2 of the first filling portion 14 at the position contacting the tip surface 12A1 to the thickness T2 of the first filling portion 14 at the position contacting the tip surface 12A1 is preferably 90 or more. The lower limit of these ratios is preferably 100 or more, 110 or more, 120 or more, or 140 or more in terms of shortening the deformation relaxation length. The upper limit of these ratios is not particularly limited, but may be, for example, 1200, 1000 or less, 800 or less, 500 or less, or 300 or less.

[0106] The length L1 is the length from the position where the first filling portion 14 contacts the leading end surface 12A1 along the longitudinal direction DR2 of the sheet 12 to the end on the side of the separation position P1. The length L2 is the length from the position directly above the leading end surface 12A1 along the longitudinal direction DR2 of the sheet 12 to the end on the side of the position where the first round of the sheet 12 and the second round of the sheet 12 contact each other. The lengths L1 and L2 can be obtained from the graph of the position displacement curve, as with the thickness T2. Specifically, first, the presence of the first intermediate portion is confirmed by a method described later. If the first intermediate portion exists, the positions E1 and E2 are found from the graph of the position displacement curve. Next, a virtual line IL4 (see FIG. 12) is drawn that passes through the position E2 and is perpendicular to the 0 mm displacement line. Then, if the intersection of the virtual line IL4 and the 0 mm displacement line is set to position E3, the total length of the lengths L1 and L2 can be obtained by obtaining the distance between the positions E2 and E3. Moreover, when the first intermediate portion does not exist, the length L1 can be obtained by finding the distance between the position E2 and the position E3 using the above method.

[0107] 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, and in order to further shorten the deformation relaxation length, the length L1 is preferably 1 mm or more, and further preferably 10 mm or more. However, if the length L1 is too long, it becomes difficult to form the upwardly convex first filling part in processing, and there is a risk that wavy thickness unevenness will occur in the first filling part, so the upper limit of the length L1 is preferably 100 mm or less from the viewpoint of easily obtaining the upwardly convex first filling part 14 and suppressing wavy thickness unevenness.

[0108] The above (length L1 + length L2) / thickness T2 or length L1 / thickness T2 can roughly represent the shape of the first filling section 14, but in order to more accurately represent a shape such as an upward convex shape in the first filling section 14, it is preferable to further use the area of ​​the first filling section 14 in a plane including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11. Specifically, when the first intermediate portion 20 is present as shown in FIG. 4, the ratio ((area S1+area S2) / thickness T2) of the sum of the area S1 (see FIG. 5) of the region R11 sandwiched between the outer peripheral surface 11A of the winding core 11 and the surface 14C of the first intermediate portion 14 in a plane including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11 and the area S2 (see FIG. 5) of the region R12 sandwiched between the outer peripheral surface 11A of the winding core 11 and the surface 20A of the first intermediate portion 20 to the thickness T2 at the position in contact with the tip surface 12A1 of the first filling portion 14 is preferably 3.0 or more. The area S1 of the region R11 in FIG. 5 represents the cross-sectional area of ​​the first filling portion 14. The area S2 of the region R12 in FIG. 5 represents the sum of the cross-sectional area of ​​the first intermediate portion 20, the cross-sectional area of ​​the sheet 12 in the region R12, and the cross-sectional area of ​​the fixing member 17 in the region R2. In addition, FIG. 5 shows a state in which the sheet 12 on the first filling portion 14 and the first interposed portion 20 is peeled off to expose the first filling portion 14 and the first interposed portion 20. When the first interposed portion 20 does not exist, it is preferable that the ratio (area S1 / thickness T2) of the area S1 of the region R11 sandwiched between the outer peripheral surface 11A of the winding core 11 and the surface 14C of the first filling portion 14 in a plane including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11 to the thickness T2 of the first filling portion 14 is 3.0 or more. If these ratios are 3.0 or more, the total of the area S1 and the area S2 or the area S1 is large relative to the thickness T2, so that the sheet 12 can be effectively lifted by the first filling portion 14, and thus the above-mentioned step can be further alleviated. From the viewpoint of further alleviating the above-mentioned step, 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. Furthermore, the upper limits of these ratios are not particularly limited, but may be, for example, 50.0 or less, or 17.0 or less.

[0109] The sum of area S1 and area S2, or area S1, can be found 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 then summing up the products. The width between the measurement points can be found from the sampling period, the rotational speed of the winding core, and the outer diameter of the winding core. Specifically, the width between the measurement points can be found from the following formula (3). In formula (3), d (μm) is the width between the measurement points, ΔT (s) is the sampling period, r (rpm) is the rotational speed of the winding core, φ (mm) is the outer diameter of the winding core, and π is the circular constant. d=ΔT×(r / 60)×φ×π×1000…(3)

[0110] As described above, the core is often reused after the roll body is used, so reworkability is required. For this reason, it is preferable that the first filling portion 14 is not bonded to the core 11. If the reworkability is good, the core can be reused after the roll body is used. In this specification, "a state in which the core can be reused" means a state in which the entire outer peripheral surface of the core is visually observed and there is no adhesion that causes a step. The removal method differs depending on the coating material used for the first filling portion. In the case of a hard coat layer for a display device that has a high crosslink density and is hard, a thinner edge thickness T1 may be easier to remove. On the other hand, in the case of a hard coat layer for a display device that has a low crosslink density and has rubber elasticity, a thicker edge thickness T1 may be easier to remove. In either case, it is sufficient that no adhesion that causes a step remains when visually observed. In addition, in this specification, "adhesion" is a concept that includes adhesion. Since the first filling portion 14 is not bonded to the core 11, the first filling portion 14 can be easily peeled off, and therefore has good reworkability. It is more preferable that the first filling portion 14 can be peeled off slowly from the winding core 11 by washing or wiping the winding core 11, or by creating an opening at the end of the first filling portion 14 with a blade-like object so as not to damage the winding core 11, using fingers, etc. It is also more preferable that the first filling portion 14 does not substantially contain an adhesive component.

[0111] The first filling portion 14 can be formed by flowing or deforming the coating material. When the coating material exhibits fluidity, it does not necessarily have to exhibit fluidity at all times as long as it exhibits fluidity before or during the rolling of the sheet.

[0112] The coating material is a material that can be applied, and has fluidity, for example, when applied or wound. Examples of coating materials having fluidity include not only liquids, but also materials that change from liquid to solid, solids that have fluidity when heated, or curable materials. When the coating material is a curable material, the first filling portion 14 is formed from a cured product of the curable material.

[0113] The shear viscosity of the coating material at 25°C and a shear rate of 1 / s is preferably 500 Pa·s or less. For example, it is possible to spread the coating material applied to the core using a spatula or the like to shape the coating material before winding the sheet, but spreading the coating material by such a process requires a lot of effort. In contrast, if the shear viscosity of the coating material is 500 Pa·s or less, the coating material can be spread into a desired shape by the pressure when winding the sheet, so a special process for spreading the coating material can be omitted. It is more preferable that the shear viscosity is 200 Pa·s or less. From the viewpoint of easily spreading the coating material, the shear viscosity is preferably 300 Pa·s or less, 100 Pa·s or less, or 50 Pa·s or less.

[0114] On the other hand, from the viewpoint of shortening the deformation relaxation length, the shear viscosity is preferably 10 Pa·s to 75 Pa·s, and more preferably 20 Pa·s to 50 Pa·s. If the shear viscosity is 10 Pa·s or more, the fluidity is not too high, so that deformation of sheet 12 can be relaxed, and if it is 75 Pa·s or less, deformation due to the tip of the first filling section can be suppressed.

[0115] Furthermore, from the viewpoint of further suppressing overflow of the coating material, it is preferable that the shear viscosity is 15 Pa·s or more, and even more preferably 20 Pa·s or more, since this can reduce overflow of the coating material from between the winding core 11 and the sheet 12 during application. Furthermore, it is preferable that the shear viscosity is 60 Pa·s or more. If the shear viscosity is 60 Pa·s or more, the fluidity of the coating material is low, and overflow of the coating material from between the winding core and the sheet during application and / or due to pressure during winding can be reduced.

[0116] The shear viscosity of the coating material can be measured using a dynamic viscoelasticity measuring device (for example, manufactured by Anton Paar Japan Co., Ltd.). Specifically, the shear viscosity of the coating material is measured 10 times at a shear rate of 1 [1 / s] using a parallel plate with a diameter of 25 mm in an environment of a temperature of 25°C and a relative humidity of 30% to 70%, and the shear viscosity is calculated by calculating the arithmetic average value of 8 shear viscosities excluding the maximum and minimum values ​​out of the 10 measured shear viscosities.

[0117] Examples of the coating material include a curable polymer composition, a thermoplastic resin, an oil, a starch, an adhesive, an adhesion agent, and a sol.

[0118] The coating material preferably does not contain a volatile component such as a solvent. When the coating material does not contain a volatile component, deformation such as cracking in the first filling portion 14 is small, and sheet marks are less likely to occur.

[0119] The coating material is preferably a material that has low fluidity in the state of the roll body 10. In this specification, "having low fluidity in the state of the roll body" means that the coating material does not overflow from the roll body during transportation or manufacturing of the roll body. When forming the first filling portion 14 in the first gap 13, the coating material needs to be coatable. If the coating material has high fluidity in the state of the roll body 10, the first filling portion may overflow and become dirty during transportation or manufacturing. In contrast, if the coating material is a material that can be applied when forming the first filling portion 14 and has low fluidity in the state of the roll body 10, the first filling portion 14 can be formed in the first gap 13 and overflow and dirt of the first filling portion 14 can be suppressed. An example of a material that can be applied when forming such a first filling portion but has low fluidity in the state of the roll body 10 is a curable polymer composition.

[0120] When the coating material is a curable polymer composition, examples of the coating material that can be used include ionizing radiation curable polymer compositions (ionizing radiation curable resin compositions and ionizing radiation curable rubber compositions), thermosetting polymer compositions (thermosetting resin compositions and thermosetting rubber compositions), and room temperature curable polymer compositions (polymer compositions that cure at room temperature, around 20°C to 30°C) (room temperature curable resin compositions and room temperature curable rubber compositions).

[0121] Room temperature curable polymer compositions include, for example, two-component curable polymer compositions consisting of a base agent and a curing agent, and one-component curable polymer compositions that cure with moisture in the air. The part at the center of the sheet in the first filling part is in a nearly sealed state with the sheet rolled up, so this part is unlikely to come into contact with air and may not cure sufficiently. In contrast, two-component curable polymer compositions start reacting when the base agent and the curing agent are mixed, so they can be cured simply by time management. In addition, two-component curable polymer compositions are preferable in that they have excellent storage stability compared to one-component curable polymer compositions.

[0122] Examples of the ionizing radiation-curable polymer composition include compositions containing a compound having an ethylenically unsaturated group such as a (meth)acryloyl group, a vinyl group, an allyl group, etc. Ionizing radiation to be irradiated when curing the ionizing radiation-curable polymer composition include visible light, ultraviolet light, X-rays, electron beams, α-rays, β-rays, and γ-rays.

[0123] Examples of the thermosetting polymer composition and the room temperature curable polymer composition include a urethane resin composition, an epoxy resin composition, and a silicone composition. Among these, a silicone composition can be preferably used. Examples of the silicone composition include a silicone gel composition and a silicone rubber composition, both of which are suitable for reducing the above-mentioned step and deformation.

[0124] In this specification, the term "silicone gel cured product (silicone gel)" formed by curing a silicone gel composition refers to a cured product with a very low crosslink density, mainly composed of organopolysiloxane, and having a penetration according to JIS K2220:2013 (1 / 4 cone) of 10 to 150. This corresponds to a product with such low hardness (i.e., softness) that the measured value (rubber hardness value) is 0 in the rubber hardness measurement according to JIS K6249:2003 and does not show a valid rubber hardness value, and in this respect, it is different from so-called silicone rubber compositions and silicone rubber cured products (rubber-like elastomers).

[0125] Silicone rubber compositions include one-component curing silicone rubber compositions and two-component curing silicone rubber compositions. One-component curing silicone rubber compositions include condensation reaction curing rubber compositions that cure at room temperature and addition reactive rubber compositions that cure by heating. Two-component curing silicone rubber compositions include condensation reaction curing rubber compositions and addition reactive rubber compositions that cure at room temperature and addition reactive rubber compositions that cure by heating. It is also possible to modify the silicone rubber composition with other resins to make it an ionizing radiation curing rubber composition. In the present invention, any of the curing methods is possible, but among these, two-component curing silicone rubber compositions are preferred because they can be cured uniformly and have excellent storage stability.

[0126] An example of the silicone rubber composition is an RTV (Room Temperature Vulcanizing) silicone rubber composition. The RTV silicone rubber composition has a smaller shrinkage rate and better dimensional stability than an ionizing radiation curable polymer composition, and has excellent fluidity before curing, so that it easily penetrates into the gap between the winding core 11 and the sheet 12 or between the sheets 12, and has low fluidity after curing. Furthermore, since this RTV silicone rubber composition has deep curing properties, the curing reaction tends to proceed uniformly regardless of the thickness at the time of application. In addition, since this composition has excellent releasability, it is easy to peel off the cured product and make it into a state where it can be used again as a roll body.

[0127] The RTV silicone rubber composition includes a condensation reaction curing RTV silicone rubber composition and an addition reaction curing RTV silicone rubber composition depending on the curing reaction mechanism. Either can be preferably used in the present invention. A condensation reaction curing RTV silicone rubber composition is preferred because there is no curing inhibition, and an addition reaction curing RTV silicone rubber composition is preferred because it has an even smaller cure shrinkage rate. In the present invention, the thickness of the coating material required to reduce the above-mentioned step tends to increase as the cure shrinkage of the material increases, so that an addition reaction curing RTV silicone rubber composition is preferably used, particularly for thin sheets (for example, the thickness of the sheet 12 is 3 μm to 45 μm).

[0128] The RTV silicone rubber composition is preferably a liquid silicone rubber (LSR) since it does not require special processing equipment.

[0129] The above-mentioned various compositions may contain functional components to exhibit desired functions. For example, since silicone rubber compositions are generally electrical insulators, they may become charged when in contact with the winding core 11, the sheet 12, or other substances. In this case, the silicone rubber composition may contain a conductive filler. This can prevent the inclusion of foreign matter such as dust, thereby suppressing the above-mentioned step from being caused.

[0130] Examples of conductive fillers that can be mixed into the silicone rubber composition include carbon black (acetylene black and ketjen black), silver powder, gold-plated silica or graphite, conductive zinc oxide, etc. In recent years, ionically conductive silicone rubber has also been developed, and this ionically conductive silicone rubber can also be used.

[0131] The silicone gel composition may contain optional components within the scope of the present invention, such as reaction inhibitors, inorganic fillers, organopolysiloxanes that do not contain silicon-bonded hydrogen atoms or silicon-bonded alkenyl groups, heat resistance imparting agents, flame retardant agents, thixotropy imparting agents, pigments, dyes, etc.

[0132] The reaction inhibitor is a component for suppressing the reaction of the composition, and specific examples thereof include acetylene-based, amine-based, carboxylate-based, and phosphite-based reaction inhibitors.

[0133] Examples of inorganic fillers include inorganic fillers such as fumed silica, crystalline silica, precipitated silica, hollow filler, silsesquioxane, fumed titanium dioxide, magnesium oxide, zinc oxide, iron oxide, aluminum hydroxide, magnesium carbonate, calcium carbonate, zinc carbonate, layered mica, carbon black, diatomaceous earth, and glass fiber; and fillers obtained by subjecting these fillers to surface hydrophobic treatment with organosilicon compounds such as organoalkoxysilane compounds, organochlorosilane compounds, organosilazane compounds, and low molecular weight siloxane compounds. Silicone rubber powder, silicone resin powder, and the like may also be blended.

[0134] In order to prevent the coating material from flowing too much while allowing the coating material to flow to the vicinity of the position (separation position) P1 where the first turn of sheet 12 separates from the outer peripheral surface 11A of core 11, it is desirable to appropriately adjust the viscosity of the coating material when applied.

[0135] The coating material is applied in a line shape, and the amount of coating material per unit width is preferably an amount that can obtain the thicknesses T1 to T3 in the above ranges in the first filling portion 14. Specifically, for example, the lower limit of the amount of coating material per unit width is 0.2 cm 3 If the amount of coating material is too small, for example, air may be trapped when coating with a syringe, making it difficult to discharge the coating material from the syringe, or the coating may be cut off when coating the sheet by running the sheet. 3 This can be prevented by setting the coating thickness to 3.5 cm / m or more. 3 If the amount of coating material applied is too large, the coating material may drip under its own weight or new steps may be created. 3 This can be prevented by applying the coating amount of 0.3 cm or less. 3 More preferably, the coating amount is 2.0 cm 3 / m or less, or 1.5cm 3It is more preferable that the thickness is equal to or less than 1 / m.

[0136] <Second filling section> The second filling portion 16 fills the second gap 15. That is, the second filling portion 16 shown in Fig. 3 contacts the outer peripheral surface 11A of the winding core 11, the back surface 12C of the sheet 12, and the first end surface 17A of the fixing member 17. Note that a small gap may exist between the second filling portion 16 and the first end surface 17A.

[0137] The second filling section 16 is composed of a coating material, or a cured product thereof when the coating material is a curable polymer composition. This coating material is the same as the coating material described in the first filling section 14, and therefore a description thereof will be omitted. The coating material may be the same as the coating material described in the first filling section 14, or may be different.

[0138] It is preferable that the thickness of the second filling portion 16 gradually decreases from the first end face 17A toward the vicinity of the arrival position P2 where the first turn of the sheet 12 reaches the outer peripheral surface 11A of the winding core 11. By changing the thickness of the second filling portion 16 in this way, a sudden change in the height direction of the sheet 12 can be suppressed, and therefore the step caused by the fixing member 17 can be mitigated.

[0139] <First intervening part> Since the first filling portion tends to be softer than the sheet, if the height of the first filling portion at the position where it contacts the tip surface of the starting end of the winding is the same as the top surface of the starting end of the winding, a step may occur at the corner of the tip surface of the starting end of the winding and the top surface when the sheet is wound. In contrast, when the first intermediate portion 20 is formed, the first intermediate portion 20 can absorb the difference in hardness between the first filling portion 14 and the sheet 12, so the step at the corner between the tip surface 12A1 of the starting end of the winding and the top surface 12A2 can be reduced. In addition, the presence of the first intermediate portion 20 can suppress the concentration of stress at the step caused by the starting end of the winding 12A, and the deformation of the sheet 12 from the third turn onwards can be made gentle, so this step can be alleviated.

[0140] The first intervening portion 20 preferably contains a coloring material or a luminescent material, similar to the first filling portion 14. By containing a coloring material or a luminescent material in the first intervening portion 20, it is easy to visually recognize the first intervening portion 20 when it protrudes from the roll body 10. In addition, it is easy to confirm the presence of the first intervening portion 20. The coloring material and the luminescent material contained in the first intervening portion 20 are the same as the coloring material and the luminescent material explained in the section on the first filling portion 14, and therefore the explanation will be omitted.

[0141] When the sheet 12 is transparent and the first intermediate portion 20 is colored, the presence or absence of the first intermediate portion 20 can be easily confirmed by visual inspection. Specifically, the sheet 12 is first unwound from the roll 10 until the surface becomes the second turn of the sheet 12. Then, in the roll 10 where the second turn of the sheet 12 becomes the surface, the vicinity of the winding start end 12A is visually observed to see whether or not a colored portion exists on the winding start end 12A. When a colored portion exists on the winding start end 12A, it can be determined that the first intermediate portion 20 exists, and when no colored portion exists, it can be determined that the first intermediate portion 20 does not exist.

[0142] Even when the sheet 12 is transparent and the first intermediate portion 20 contains a luminescent material, the presence or absence of the first intermediate portion 20 can be easily confirmed by visual inspection in the same manner as described above. When the luminescent material is a material that emits light when irradiated with light such as ultraviolet light or visible light, the presence or absence of the first intermediate portion 20 is confirmed by irradiating it with light.

[0143] When the thickness of the sheet 12 is 50 μm or more and 200 μm or less, the thickness T3 (see FIG. 4) of the first intermediate portion 20 is preferably 2 μm or more and 110 μm or less. If the thickness T3 of the first intermediate portion 20 is within this range, the deformation relaxation length can be shortened while avoiding adverse effects on the winding of the sheet 12. Note that, even when the thickness T3 of the first intermediate portion 20 exceeds 110 μm, the deformation relaxation length can be shortened, but adverse effects may be caused on the winding of the sheet 12.

[0144] When the thickness of sheet 12 is 3 μm or more and less than 50 μm, or even 40 μm or less, sheet 12 is more likely to deform due to the step caused by winding start end 12A than when sheet 12 is thicker. For this reason, thickness T3 of first intermediate portion 20 is preferably 0.5 μm or more and 50 μm or less. If thickness T3 of first intermediate portion 20 is within this range, the above-mentioned deformation relaxation length can be shortened while avoiding the adverse effects of winding sheet 12.

[0145] The thickness T3 of the first intermediate portion 20 is the maximum thickness of the first intermediate portion 20. The thickness T3 of the first intermediate portion 20 is measured as follows. First, a portion including the winding start end portion 12A, the first intermediate portion 20, and the second turn of the sheet 12 is sampled and fixed so as not to be crushed. Then, the cross section of the fixed portion is polished, and the thickness T3 of the first intermediate portion 20 is measured with a stereomicroscope (for example, product name "Digital Microscope VHX-7000", manufactured by Keyence Corporation).

[0146] The first intervening portion 20 is composed of a coating material, or a cured product thereof when the coating material is a curable polymer composition. This coating material is the same as the coating material described in the first filling portion 14, and therefore a description thereof will be omitted. The coating material may be the same as the coating material described in the first filling portion 14, or may be different.

[0147] <First exposure suppression member> The first exposure suppression member 18 is a member for suppressing exposure of the end 14A of the first filling portion 14 in the width direction DR1 of the winding core 11 to the outside of the sheet 12. The first exposure suppression member 18 of the present embodiment is a member for suppressing the end 14A of the first filling portion 14 from protruding to the outside of the sheet 12. In other words, the first exposure suppression member 18 functions as a damming member that prevents the end 14A of the first filling portion 14 from protruding to the outside of the sheet 12.

[0148] 2, in order to prevent the end 14A of the first filling portion 14 from protruding outside the sheet 12, the first exposure suppression member 18 is located outside the end 14A of the first filling portion 14 in the width direction DR1 as shown in Fig. 2, and is covered by the sheet 12. The first exposure suppression member 18 is disposed on the outer circumferential surface 11A of the winding core 11.

[0149] 2, the first exposure suppression members 18 are present on both sides of the first filling portion 14 in the width direction DR1. This makes it possible to suppress the ends 14A of the first filling portion 14 from protruding outside the sheet 12.

[0150] If the first exposure suppression member is present in the effective region, there will be a portion in the effective region of the sheet in the width direction of the core where the first filling portion is not present, and there is a risk of there being a portion where the step cannot be effectively alleviated. For this reason, it is preferable that the first exposure suppression member 18 is not present in the effective region R1, but is located in the non-effective region R2, as shown in FIG.

[0151] When the first filling portion 14 comes into contact with the first exposure suppression member 18 due to the pressure applied when the sheet 12 is wound, the first filling portion 14 tends to move along the first exposure suppression member 18. For this reason, if the length of the first exposure suppression member in the circumferential direction of the winding core is short, there is a risk that the first filling portion will go around the first exposure suppression member and protrude. For this reason, it is preferable that the first exposure suppression member 18 extend along the circumferential direction DR4 of the winding core 11 (see FIG. 7).

[0152] In a plan view of the roll body 10 (see FIG. 2), if there is a gap between the end face of the first exposure suppression member on the winding start end side and the winding start end and the fixed member, the first exposure suppression member can generally suppress the end of the first filling portion from protruding, but there is a risk that the end of the first filling portion will protrude slightly outside the sheet through this gap. In contrast, if a part of the first exposure suppression member 18 overlaps the winding start end 12A as shown in FIGS. 2 and 6, the above gap is less likely to be formed, so that the end 14A of the first filling portion 14 can be further suppressed from protruding outside the sheet 12, and the end of the first intermediate portion 20 can be suppressed from protruding outside the sheet 12. In addition, first exposure suppression member 18 may be positioned so that the end face of first exposure suppression member 18 on the side of starting end 12A contacts tip face 12A1 of starting end 12A and second end face 17B of fixed member 17. However, from the viewpoint of making it less likely for the above-mentioned gap to be formed due to changes over time, etc., and from the viewpoint of suppressing the end of first intervening portion 20 from protruding, it is preferable to position first exposure suppression member 18 so that a portion of first exposure suppression member 18 overlaps starting end 12A.

[0153] The length L3 (see FIG. 7) of the first exposure suppression member 18 in the circumferential direction DR4 of the winding core 11 is preferably greater than the maximum length of the first filling portion 14 in the circumferential direction DR4. This makes it possible to prevent the first filling portion 14 from going around the first exposure suppression member 18 and protruding outside the sheet 12. The length L3 of the first exposure suppression member 18 is preferably 10 mm or more. If the length L3 of the first exposure suppression member 18 is 10 mm or more, the going around of the first exposure suppression member 18 in the first filling portion 14 can be further suppressed. From the viewpoint of further suppressing the going around of the first exposure suppression member 18 in the first filling portion 14, the lower limit of the length L3 of the first exposure suppression 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 overlap between the first exposure suppression members 18, the upper limit of the length L3 of the first exposure suppression member 18 is preferably less than the outer circumferential length of the winding core 11, and may be, for example, equal to or less than the outer circumferential length (mm) of the winding core 11 minus 10 mm. If the length L3 of the first exposure suppression member 18 is equal to or less than the outer circumferential length (mm) of the winding core 11 minus 10 mm, overlap between the first exposure suppression members 18 can be reliably suppressed, and therefore a step caused by overlap between the first exposure suppression members 18 can be suppressed. The length of the first exposure suppression member in the circumferential direction of the winding core can be obtained by measuring the length of the first exposure suppression member in the circumferential direction of the winding core at 10 points and calculating the arithmetic average of the lengths at 8 points excluding the maximum and minimum values ​​among the 10 measured lengths.

[0154] The width W4 (see FIG. 7) of the first exposure suppression member 18 in the width direction DR1 of the core 11 is preferably 1 mm or more. If the width W4 of the first exposure suppression member 18 is 1 mm or more, even if the first filling portion 14 climbs over the first exposure suppression member 18 as described below, the first filling portion 14 stops on the first exposure suppression member 18 and can be prevented from protruding. From the viewpoint of further suppressing the protrusion of the first filling portion 14, the lower limit of the width W4 of the first exposure suppression member 18 is more preferably 5 mm or more, 10 mm or more, or 30 mm or more. From the viewpoint of reducing step marks caused by the first exposure suppression member 18, the upper limit of the width W4 of the first exposure suppression member 18 may be 50 mm or less, 20 mm or less, or 5 mm or less. The width of the first exposure suppression member in the width direction of the core can be obtained by measuring the width of the first exposure suppression member at 10 points and calculating the arithmetic average value of the widths at 8 points excluding the maximum and minimum values ​​among the 10 measured widths.

[0155] If the thickness of the first exposure suppression member is thin, there is a risk that the first filling portion will climb over the first exposure suppression member and protrude. For this reason, it is preferable that the thickness T4 (see FIG. 6) of the first exposure suppression member 18 at the position in contact with the tip surface 12A1 is equal to or greater than the thickness T2 (see FIG. 4) of the first filling portion 14 at the position in contact with the tip surface 12A1. This makes it possible to prevent the first filling portion 14 from climbing over the first exposure suppression member 18 and protruding.

[0156] The thickness T4 of the first exposure suppression member 18 at the position in contact with the tip surface 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, it is possible to further suppress the first filling portion 14 from climbing over the first exposure suppression member 18. If the thickness T4 of the first exposure suppression member 18 is 5000 μm or less, it is possible to suppress the generation of a new step due to the first exposure suppression member 18. From the viewpoint of further suppressing the first filling portion 14 from climbing over the first exposure suppression member 18, it is more preferable that the lower limit of the thickness T4 of the first exposure suppression member 18 is 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 due to the first exposure suppression member 18, it is more preferable that the upper limit of the thickness T4 of the first exposure suppression member 18 is 3000 μm or less, 2000 μm or less, or 1000 μm or less.

[0157] The storage elastic modulus of first exposure suppressing member 18 at 25° C. is preferably equal to or lower than the storage elastic modulus of first filling portion 14 at 25° C. If the storage elastic modulus of the first exposure suppressing member is high, a gap will be generated between the first exposure suppressing member and the winding core near the winding start end, and there is a risk that the first filling portion will flow out from this gap; however, if the storage elastic modulus of first exposure suppressing member 18 is equal to or lower than the storage elastic modulus of first filling portion 14, it is possible to prevent first filling portion 14 from flowing out.

[0158] The storage elastic modulus of the first exposure suppressing member 18 at 25°C is preferably 0.001 MPa or more and 5 MPa or less. If the storage elastic modulus of the first exposure suppressing member 18 is 0.001 MPa or more, the first exposure suppressing member 18 can be further prevented from flowing out, and if the storage elastic modulus of the first exposure suppressing member 18 at 25°C is 5 MPa or less, the generation of a gap between the first exposure suppressing member 18 and the winding core 11 in the vicinity of the winding start end 12A can be suppressed. The lower limit of the storage elastic modulus of the first exposure suppressing 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 storage elastic modulus of the first exposure suppressing member 18 is preferably 3 MPa or less, 1 MPa or less, or 0.5 MPa or less.

[0159] The storage modulus of the first exposure suppression member 18 at 25°C can be measured using a dynamic viscoelasticity measuring device (for example, manufactured by Anton Paar Japan Co., Ltd.). Specifically, first, a sample with a diameter of 10 mm is cut out from the first exposure suppression member. If a sample with a diameter of 10 mm cannot be cut out from the first exposure suppression member, a sample with a diameter of 10 mm is prepared using the same material as that constituting the first exposure suppression member. Then, this sample is fixed to 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 viscoelasticity measuring device in an environment with a temperature 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.

[0160] The density of first exposure suppressing member 18 at 25° C. is preferably equal to or greater than the density of first filling portion 14 at 25° C. If the density of the first exposure suppressing member is low, there is a risk that the first filling portion will seep out from the first exposure suppressing member, but if the density of first exposure suppressing member 18 is equal to or less than the density of first filling portion 14, such seepage of first filling portion 14 can be suppressed.

[0161] The density of the first exposure suppression member 18 at 25° C. is 0.01 g / cm 3 It is preferable that the density of the first exposure suppressing member 18 at 25° C. is 0.01 g / cm or more. 3 If the density is equal to or greater than this, it is possible to prevent the first filling portion 14 from seeping out from the first exposure suppression member 18. The lower limit of the density of the first exposure suppression member 18 at 25° C. is 0.03 g / cm 3 More than 0.05g / cm 3 or more than 0.1g / cm 3 The upper limit of the density of the first exposure suppression member 18 at 25° C. is 0.5 g / cm from the viewpoint of preventing the first exposure suppression member 18 from triggering deformation of the sheet 12. 3 Below, 0.4g / cm 3 or less than 0.3g / cm 3 It may be the following.

[0162] The density of the first exposure suppressing member 18 at 23°C can be measured as follows. First, a sample having a size of 1 cm x 1 cm is cut out from the first exposure suppressing member. If a sample of the above size cannot be cut out from the first exposure suppressing member, a sample having a size of 1 cm x 1 cm is obtained using the same material as that constituting the first exposure suppressing member. Then, the mass and thickness of this sample are measured in an environment with a temperature 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 be measured in the same manner as the density of the first exposure suppressing member 18.

[0163] 2 is provided on each side of the first filling portion 14, but two or more first exposure suppression members 18 may be provided on each side. By providing two or more first exposure suppression members 18 on each side, it is possible to further prevent the first filling portion 14 from climbing over the first exposure suppression members 18.

[0164] The material of the first exposure suppression member 18 is not particularly limited as long as it is a material that does not adversely affect the sheet, and examples thereof include resin, metal, rubber, gel, tape (including cushion tape), clay, and paper. These materials are easy to handle and / or install. Among these, resin and tape are preferable because they are easy to handle and install. Furthermore, when rubber or gel is used as the material of the first exposure suppression member 18, the first exposure suppression member 18 itself is deformable, so that it is possible to suppress the occurrence of new steps caused by the first exposure suppression member 18.

[0165] The resin may 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 of the resin can be freely changed before the curable resin composition is cured, so that the generation of a new step due to the first exposure suppressing member 18 can be suppressed.

[0166] The thermoplastic resin is not particularly limited, and examples thereof include polyolefin (e.g., polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, polyurethane, ABS resin, acrylic resin, etc. Among these, polyurethane is preferred from the viewpoint of high exposure suppression effect. Polyurethane may be in the form of, for example, gel or foam.

[0167] Examples of the curable resin composition include an ionizing radiation curable resin composition that is cured by ultraviolet light or an electron beam, a heat curable resin composition, a room temperature curable resin composition that is cured at room temperature of about 20° to 30° C., a catalyst curable resin composition that is cured by a catalyst, an anaerobic curable resin composition, etc. Since an ionizing radiation curable resin composition needs to be irradiated with ultraviolet light or an electron beam after application, from the viewpoint of ease of curing, a heat curable resin composition, a catalyst curable resin composition, an anaerobic curable resin composition, etc. are preferred.

[0168] The tape may be a tape having adhesive on both sides, a tape having adhesive on only one side, or a tape having no adhesive. When the tape has adhesive on both sides or only one side, the adhesive may be provided not only on the entire surface, but also on a part of the surface. From the viewpoint of suppressing contamination of the sheet 12, a tape having no adhesive is preferable, but in this case, the tape having no adhesive is sandwiched between the core and the first round of the sheet, which makes the process somewhat difficult. For this reason, it is preferable to provide the adhesive on a part of the surface.

[0169] Since the sheet is used for optical purposes, for example, the paper is preferably one that does not easily generate paper dust, such as clean paper.

[0170] <Second exposure suppression member> The second exposure suppression member 19 is a member for suppressing exposure of the end 16A of the second filling portion 16 in the width direction DR1 of the winding core 11 to the outside of the sheet 12. The second exposure suppression member 19 of the present embodiment is a member for suppressing the end 16A of the second filling portion 16 from protruding to the outside of the sheet 12. In other words, the second exposure suppression member 19 functions as a blocking member that blocks the end 16A of the second filling portion 16 from protruding.

[0171] In order to prevent the end 16A of the second filling portion 16 from protruding outside the sheet 12, the second exposure suppression member 19 is positioned outside the end 16A of the second filling portion 16 in the width direction DR1 as shown in Figure 2, and is covered by the sheet 12.

[0172] 2 are present on both sides of the second filling portion 16 in the width direction DR1. This makes it possible to prevent the ends 16A of the second filling portion 16 from protruding outside the sheet 12.

[0173] It is preferable that the second exposure suppression member 19 is not present in the effective region R1 but is located in the non-effective region R2, for the same reasons as those described in the section for the first exposure suppression member 18. It is preferable that the second exposure suppression member 19 extends along the circumferential direction DR4 of the winding core 11, for the same reasons as those described in the section for the first exposure suppression member 18.

[0174] In a plan view of the roll body 10 (see FIG. 2), if there is a gap between the end face of the second exposure suppression member on the fixed member side and the first end face of the fixed member, the second exposure suppression member can generally suppress the end of the second filling portion from protruding outward from the gap, but the end of the second filling portion may protrude slightly outside the sheet. In contrast, if a part of the second exposure suppression member 19 overlaps the fixed member 17 as shown in FIG. 2 and FIG. 6, the gap is less likely to be formed, so that the end 16A of the second filling portion 16 can be more effectively prevented from protruding outward from the sheet 12. Note that the second exposure suppression member 19 may be disposed so that the end face of the second exposure suppression member 19 on the fixed member 17 side contacts the first end face 17A of the fixed member 17, but from the viewpoint of preventing the gap from being formed due to changes over time, etc., it is preferable to dispose the second exposure suppression member 19 so that a part of the second exposure suppression member 19 overlaps the fixed member 17.

[0175] The length L4 (see FIG. 7) of the second exposure suppression member 19 in the circumferential direction DR4 of the winding core 11 is preferably greater than the maximum length of the second filling portion 16 in the circumferential direction DR4. This makes it possible to suppress the second filling portion 16 from going around the second exposure suppression member 19 and protruding out. In addition, since the second gap 15 is smaller than the first gap 13, the second filling portion 16 is less likely to protrude out than the first filling portion 14. For this reason, the length L4 of the second exposure suppression member 19 may be shorter than the length L3 of the first exposure suppression member 18.

[0176] The length L4 of the second exposure suppression member 19 is preferably 1 mm or more. If the length L4 of the second exposure suppression member 19 is 1 mm or more, the wrapping around of the second exposure suppression member 19 in the second filling section 16 can be further suppressed. From the viewpoint of further suppressing the wrapping around of the second exposure suppression member 19 in the second filling section 16, the lower limit of the length L4 of the second exposure suppression member 19 is more preferably 5 mm or more, 10 mm or more, or 50 mm or more. From the viewpoint of suppressing the overlapping of the second exposure suppression members 19, the upper limit of the length L4 of the second exposure suppression member 19 is preferably less than the outer circumferential length of the winding core 11, and may be, for example, less than the length obtained by subtracting 10 mm from the outer circumferential length (mm) of the winding core 11. If the length L4 of the second exposure suppression member 19 is less than the length obtained by subtracting 10 mm from the outer circumferential length (mm) of the winding core 11, the overlapping of the second exposure suppression members 19 can be reliably suppressed, and therefore the step caused by the overlapping of the second exposure suppression members 19 can be suppressed. The length of the second exposure suppression member in the circumferential direction of the winding core can be obtained by measuring the length of the second exposure suppression member in the circumferential direction of the winding core at 10 points and calculating the arithmetic average of the lengths of 8 points excluding the maximum and minimum values ​​among the 10 measured lengths.

[0177] The width W5 (see FIG. 7) of the second exposure suppression member 19 in the width direction DR1 of the core 11 is preferably 1 mm or more for the same reasons as those described in the section on the first exposure suppression member 18. The lower limit of the width W5 of the second exposure suppression member 19 is more preferably 5 mm or more, 10 mm or more, or 20 mm or more from the viewpoint of further suppressing the protrusion of the second filling portion 16. If the width W5 of the second exposure suppression member 19 is large, the second exposure suppression member 19 may enter the effective region R1, and a step may be generated due to the influence of the second exposure suppression member 19 itself. However, even if the width W5 of the second exposure suppression member 19 is large, if the second exposure suppression member 19 is exposed outside the sheet 12 so that the second exposure suppression member 19 does not enter the effective region R1, the step caused by the second exposure suppression member 19 can be suppressed. Furthermore, by exposing the second exposure suppression member 19 outside the sheet 12, the protrusion of the second filling portion 16 can be further suppressed. Therefore, the upper limit of width W5 of second exposure suppressing member 19 may be 35 mm or less, 30 mm or less, or 25 mm or less. The width of the first exposure suppressing member can be obtained by measuring the width of the second exposure suppressing member at 10 locations and calculating the arithmetic mean value of 8 widths excluding the maximum and minimum values ​​among the 10 measured widths.

[0178] For the same reasons as those described in the section on the first exposure suppression member 18, the thickness of the second exposure suppression member 19 is preferably equal to or greater than the thickness of the second filling portion 16. The thickness of the second exposure suppression member 19 is preferably equal to or greater than 5 μm and equal to or less than 5000 μm. If the thickness of the second exposure suppression member 19 is equal to or greater than 5 μm, the second filling portion 16 can be further prevented from climbing over the second exposure suppression member 19. Furthermore, if the thickness of the second exposure suppression member 19 is equal to or less than 5000 μm, the generation of a new step due to the second exposure suppression member 19 can be suppressed. From the viewpoint of further preventing the second filling portion 16 from climbing over the second exposure suppression member 19, the lower limit of the thickness of the second exposure suppression member 19 is more preferably equal to or greater than 10 μm, equal to or greater than 50 μm, or equal to or greater than 100 μm. It is more preferable that the upper limit of the thickness of the second exposure suppressing member 19 is 3000 μm or less, 2000 μm or less, or 1000 μm or less, from the viewpoint of further suppressing the occurrence of new steps due to the second exposure suppressing member 19. The thickness of the second exposure suppressing member can be obtained by measuring the thickness of the second exposure suppressing member at 10 locations and calculating the arithmetic average of the lengths of 8 locations excluding the maximum and minimum values ​​among the thickness measured at the 10 locations.

[0179] The storage elastic modulus of second exposure suppressing member 19 at 25° C. is preferably equal to or lower than the storage elastic modulus of second filling portion 16 at 25° C. for the same reasons as those described in the section for first exposure suppressing member 18.

[0180] The storage elastic modulus of the second exposure suppressing member 19 at 25°C is more preferably 0.001 MPa or more and 5 MPa or less. If the storage elastic modulus of the second exposure suppressing member 19 is 0.001 MPa or more, the second exposure suppressing member 19 can be prevented from flowing out, and if the storage elastic modulus of the second exposure suppressing member 19 is 5 MPa or less, the second exposure suppressing member 19 can be prevented from forming a gap between the second exposure suppressing member 19 and the winding core 11 in the vicinity of the winding start end 12A. The lower limit of the storage elastic modulus of the second exposure suppressing member 19 at 25°C is more preferably 0.003 MPa or more, 0.005 MPa or more, or 0.01 MPa or more. The upper limit of the storage elastic modulus of the second exposure suppressing member 19 at 25°C is more preferably 3 MPa or less, 1 MPa or less, or 0.5 MPa or less. The storage elastic modulus of the second exposure suppressing member and the second filling portion at 25°C can be measured by the same method as that of the first exposure suppressing member.

[0181] The density of the second exposure suppressing member 19 at 25° C. is preferably equal to or higher than the density of the second filling portion 16 at 25° C. for the same reasons as those described in the section regarding the first exposure suppressing member 18.

[0182] The density of the second exposure suppression member 19 at 25° C. is 0.01 g / cm 3 It is preferable that the density of the second exposure suppressing member 19 is 0.01 g / cm or more. 3 If the density is equal to or greater than this, it is possible to prevent the second filling portion 16 from seeping out from the second exposure suppression member 19. In addition, if the density of the second exposure suppression member 19 is 0.01 g / cm 3 If the density is equal to or greater than this, deformation of the second exposure suppression member 19 due to winding pressure can be suppressed, and therefore protrusion of the second filling portion 16 can be suppressed. The lower limit of the density of the second exposure suppression member 19 at 23° C. is 0.03 g / cm 3 More than 0.05g / cm 3 or more than 0.1g / cm 3 The upper limit of the density of the second exposure suppressing member 19 at 25° C. is 0.5 g / cm3 from the viewpoint of preventing the second exposure suppressing member 19 from becoming a trigger for deformation. 3 Below, 0.4g / cm 3or less than 0.3g / cm 3 The densities of the second exposure suppressing member and the second filling portion at 25° C. can be measured by the same method as for the density of the first exposure suppressing member.

[0183] The material of the second exposure suppression member 19 is not particularly limited as long as it is a material that does not adversely affect the seat, and examples thereof include the same material as that of the first exposure suppression member 18.

[0184] <<Other roll bodies>> In the roll body 10, the tip surface 12A1 of the winding start end 12A of the sheet 12 and the second end surface 17B of the fixed member 17 are substantially aligned in the radial direction DR3 of the winding core 11, but as in the roll body 50 shown in Fig. 13, the tip surface 12A1 of the winding start end 12A of the sheet 12 may protrude beyond the second end surface 17B of the fixed member 17. In this case, the second gap 15 is filled with a second filling portion 16, and a third gap 51 located between the outer circumferential surface 11A of the winding core 11 and the back surface 12C of the first turn of the sheet 12 and on the second end surface 17B side is filled with a third filling portion 52, and a third exposure suppression member 53 (see Fig. 14) may be provided outside the third filling portion 52 in the width direction DR1 of the winding core 11.

[0185] <Third Gap> 13 is a gap surrounded by the outer circumferential surface 11A of the core 11, the back surface 12C of the first turn of the sheet 12, and the second end surface 17B of the fixing member 17.

[0186] <Third filling section> The third filling section 52 is similar to the second filling section 16 except that it fills the third gap 51, and therefore a description thereof will be omitted here.

[0187] <Third exposure suppression member> The third exposure suppression member 53 is similar to the second exposure suppression member 19 except that it is provided outside the third filling portion 52 in the width direction DR1 of the winding core 11, and therefore a description thereof will be omitted here.

[0188] In the roll body 10, the second gap 15 is filled with the second filling portion 16, but from the viewpoint of reducing the step caused by the winding start end portion 12A of the sheet 12, it is sufficient that the first gap 13 is filled with the first filling portion 14, so the second gap 15 does not have to be filled with the second filling portion 16 as in the roll body 60 shown in FIG. 15. In the roll body 60, the second gap 15 is hollow. In this case, since the second gap 15 of the roll body 60 is hollow, the second filling portion does not protrude. For this reason, it is not necessary to provide a second exposure suppression member 19 as shown in FIG. 16.

[0189] In the roll body 10, the first gap 13 is filled with the first filling portion 14, but from the viewpoint of reducing the step caused by the fixing member 17, it is sufficient that the second gap 15 is filled with the second filling portion 16, so the first gap 13 does not have to be filled with the first filling portion 14 as in the roll body 70 shown in FIG. 17. In the roll body 70, the first gap 13 is hollow. In this case, since the first gap 13 of the roll body 60 is hollow, the first filling portion does not protrude. For this reason, it is not necessary to provide a first exposure suppression member 18 as shown in FIG. 18.

[0190] The roll body 10 includes one fixing member 17, but may include two or more fixing members as shown in FIG. 19. In the roll body 80 shown in FIG. 19, in addition to the fixing member 17, a fixing member 81 is provided on the first end face 17A side of the fixing member 17. In the roll body 80 shown in FIG. 19, the tip 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 a step caused by the fixing member 17, it is preferable that the second gap 15 is filled with the second filling portion 16 and the third gap 51 is filled with the third filling portion 52. In this case, it is preferable that a third exposure suppression member 53 (see FIG. 20) is provided on the outer side of the third filling portion 52 in the width direction DR1 of the winding core 11.

[0191] 19, in order to suppress a step caused by the fixed member 81, it is preferable that a second gap 82 on a first end face 81A side of the fixed member 81 described later is filled with a second filling portion 83, and a third gap 84 on a second end face 81B side of the fixed member 81 described later is filled with a third filling portion 85. In this case, it is preferable that a second exposure suppression member 86 (see FIG. 20) is provided on the outside of the second filling portion 83 in the width direction DR1 of the winding core 11, and a third exposure suppression member 87 (see FIG. 20) is provided on the outside of the third filling portion 85.

[0192] <Fixing material> The fixing member 81 has a first end face 81A and a second end face 81B opposite to the first end face 81. The first end face 81A and the second end face 81B both extend in the width direction DR1 of the winding core 11. The second end face 81B is located closer to the winding-start end 12A side than the first end face 81A. The fixing member 81 is similar to the fixing member 17, and therefore a description thereof will be omitted here.

[0193] <Second gap> 19 is a gap surrounded by the outer circumferential surface 11A of the core 11, the back surface 12C of the first turn of the sheet 12, and the first end surface 81A of the fixing member 81.

[0194] <Third Gap> 19 is a gap surrounded by the outer circumferential surface 11A of the winding core 11, the back surface 12C of the first turn of the sheet 12, and the second end surface 81B of the fixing member 81.

[0195] <Second filling section and third filling section> The second filling section 83 is similar to the second filling section 16 except that it fills the second gap 82, and therefore a description thereof will be omitted here. The third filling section 85 is similar to the second filling section 16 except that it fills the third gap 84, and therefore a description thereof will be omitted here.

[0196] <Second exposure suppression member and third exposure suppression member> The second exposure suppression member 86 is similar to the second exposure suppression member 19 except that it is provided outside the second filled portion 83 in the width direction DR1 of the winding core 11, and therefore a description thereof will be omitted here. The third exposure suppression member 87 is similar to the second exposure suppression member 19 except that it is provided outside the third filled portion 85 in the width direction DR1 of the winding core 11, and therefore a description thereof will be omitted here.

[0197] Although the roll body 10 includes a fixing member 17, it does not necessarily have to include the fixing member 17 like a roll body 90 shown in FIGS.

[0198] 13, 15, 19, and 21 do not show length L1, length L2, thickness T2, thickness T3, area S1, and area S2, but in roll bodies 50, 60, 80, and 90, length L1 to length L4, thickness T2 to thickness T4, (length L1+L2) / thickness T2, and (area S1+S2) / thickness T2 are the same as in the case of roll body 10.

[0199] Although the roll bodies 50, 60, 80, and 90 all include the first intermediate portion 20, they do not necessarily have to include the first intermediate portion, as in the case of the roll body 30 shown in FIG.

[0200] In Figure 15, the entire surface of the fixed member 17 is in close contact with the starting end 12A, but similar to the roll body 40 shown in Figure 9, the first filling section 14 and the first exposure suppression member 18 may be inserted between the starting end 12A and the fixed member 17.

[0201] In the 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 as shown in Figs. 23 and 24, the first exposure suppression member 101 may be disposed on the sheet 12 side. In the roll 100 shown in Figs. 23 and 24, 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, but is disposed on the back surface 12C of the sheet 12, not on the outer peripheral surface 11A of the core 11. Specifically, side tapes extending along the longitudinal direction DR2 are attached to both ends of the sheet 12 in the width direction (width direction DR1 of the core 11) on the back surface 12C of the sheet 12, and a part of the side tapes is the first exposure suppression member 101. Both ends of the sheet 12 are present in the non-effective region R2, so there is no problem with the product even if such side tapes are attached. The side tape is not particularly limited, but examples thereof include side tapes for optical films.

[0202] 23 and 25, the second exposure suppression member 102 is located outside the end 16A of the second filling section 16 in the width direction DR1 and is covered by the sheet 12, but is disposed on the back surface 12C of the sheet 12, not on the outer circumferential surface 11A of the winding core 11. The second exposure suppression member 102 is also part of the side tape.

[0203] The first exposure suppressing member 101 and the second exposure suppressing member 102 may be formed by coating instead of by side tape. When the first exposure suppressing member 101 and the second exposure suppressing member 102 are formed by coating, they may be made of the same material as the material constituting the first exposure suppressing member 18 and the second exposure suppressing member 19.

[0204] In the roll body 10, the second gap 15 is filled with the second filling portion 16, but as in the roll body 110 shown in Fig. 27, the second gap 15 is not filled with the second filling portion 16, the second gap 15 is hollow, and the second intermediate portion 111 may be provided in at least a region 12D corresponding to the second gap 15 between the sheets 12 in the first turn and thereafter. In this case, it is preferable that an exposure suppression member 112 (see Fig. 26) is provided on the outside of an end portion 111A of the second intermediate portion 111 in the width direction DR1 of the winding core 11.

[0205] <Second intervening part> The second intermediate portion 111 is provided between the sheets 12 in the first and subsequent turns. Therefore, the sheet 12 is always present on the second intermediate portion 111. The second intermediate portion 111 extends in the width direction DR1 of the winding core 11.

[0206] The maximum thickness T5 (see FIG. 28) of the second intermediate portion 111 is preferably 0.01 mm or more. If the maximum thickness T5 of the second intermediate portion 111 is 0.01 mm or more, the step caused by the fixing member 17 can be effectively alleviated. From the viewpoint of more effectively alleviating the step, 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, the step caused by the fixing member can be alleviated, but the winding of the sheet 12 may be adversely affected. For this reason, 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 intermediate portion 111 can be measured by the same method as the thickness T2 using a laser displacement meter or a stereo microscope.

[0207] When the thickness of the second intermediate portion 111 is measured along the longitudinal direction DR2 of the sheet 12, the ratio of the length L5 (see FIG. 28) from the tip 111B of the second intermediate portion 111 to the position where the second intermediate portion 111 has the maximum thickness T5 in the longitudinal direction DR2 to the maximum thickness T5 of the second intermediate portion 111 is preferably 12 or more (length L5 / maximum thickness T5). If this ratio is 12 or more, it is possible to suppress deformation remaining near the tip 111B of the second intermediate portion 111, and if the thickness of the second intermediate portion is too thick, the roll body may deviate from a perfect circle during winding, resulting in poor winding properties. However, if this ratio is 12 or more, the second intermediate portion 111 is not too thick, so that poor winding properties can be suppressed. Also, if the thickness of the second intermediate portion is too thick, there is a risk of new deformation occurring due to the second intermediate portion, but if this ratio is 12 or more, it is possible to suppress such new deformation from occurring. From the viewpoint of shortening the deformation relaxation 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 reducing the step caused by the fixing member, it is preferable that the maximum thickness T5 of the second intermediate portion 111 is large, and therefore the upper limit of this ratio is preferably, for example, 2000 or less, 1000 or less, 500 or less, or 375 or less.

[0208] From the viewpoint of reducing the step, 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, and in order to further shorten the deformation reduction length, the length L5 is more preferably 7.0 mm or more, and further preferably 9.0 mm or more. However, if the length L5 is too long, in the region R3 (see FIG. 28) from the tip 111B of the second intermediate portion 111 to the position of the maximum thickness T5, the second intermediate portion 111 is difficult to form a second intermediate portion having a convex surface, and there is a risk of wavy thickness unevenness occurring in the second intermediate portion. Therefore, the upper limit of the length L5 is preferably 20 mm or less, from the viewpoint of making the surface 111C of the second intermediate portion 111 in the region R3 easily convex and suppressing wavy thickness unevenness.

[0209] The length L5 can be obtained from the graph of the position-displacement curve, similarly to the maximum thickness T5. Specifically, first, since the displacement amount increases when the tip 111B of the second intermediate portion 111 exists, a first position is found from the graph of the position-displacement curve, which is the intersection of the 0 mm displacement amount line and the position-displacement curve at the point where the displacement amount starts to increase. Next, an imaginary line is drawn that passes through the position where the displacement amount is the highest and is perpendicular to the 0 mm displacement amount line. Then, the intersection of this imaginary line and the 0 mm displacement amount line is set as the second position, and the length L5 can be obtained by finding the distance between the first position and the second position.

[0210] The length L5 / maximum thickness T5 can roughly represent the shape of the second intermediate portion 111, but in order to more accurately represent the shape of the convex surface 111C, it is preferable to further use the cross-sectional area of ​​the second intermediate portion 111. Specifically, it is preferable that the ratio (cross-sectional area S3 / maximum thickness T5) of the cross-sectional area S3 (see FIG. 28) of the second intermediate portion 111 from the tip 111B to the position of the maximum thickness T5 in a plane (plane shown in FIG. 28) including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11 to the maximum thickness T5 of the second intermediate portion 111 is 2.5 or more. If this ratio is 2.5 or more, the cross-sectional area S3 of the second intermediate portion 111 is large relative to the maximum thickness T5, so that the second intermediate portion 111 can effectively lift the sheet 12, thereby further reducing the step. From the viewpoint of further reducing the step, 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. The upper limit of the cross-sectional area S3 / maximum thickness T5 is not particularly limited, but may be, for example, 20.0 or less, 17.5 or less, 15.0 or less, 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 intermediate portion 111 (the cross-sectional area of ​​the region surrounded by the solid line in the second intermediate portion 111 in FIG. 28), and 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 the first position to the second position on the graph of the position displacement curve, and then summing up the products.

[0211] The constituent material of the second intermediate portion 111 is similar to the constituent material of the second filling portion 16, and therefore, the description thereof will be omitted here.

[0212] <Exposure suppression material> The exposure suppression member 112 is an integrated member consisting of a first exposure suppression member that suppresses exposure of the end 14A of the first filling portion 14 and a second exposure suppression member that suppresses exposure of the end 111A of the second intermediate portion 111. A first portion 112A corresponding to the first exposure suppression member in the exposure suppression member 112 shown in FIG. 29 is similar to the first exposure suppression member 18, and therefore a description thereof will be omitted here. A second portion 112B corresponding to the second exposure suppression member in the exposure suppression member 112 shown in FIG. 29 is similar to the second exposure suppression member 19 except that the second portion 112B is an area 12D (see FIG. 29) corresponding to at least the second gap 15 between the sheets 12 in which the second intermediate portion 111 is provided, and is provided outside the end 111A of the second intermediate portion 111 in the width direction DR1 of the core 11, and therefore a description thereof will be omitted here. In addition, the exposure suppression member 112 may 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 intermediate portion 111.

[0213] <<Roll body manufacturing method>> The roll body 10 can be manufactured, for example, by the following method. Figures 30 to 33 are diagrams that diagrammatically show the manufacturing process of the roll body according to this embodiment. First, as shown in Figure 30(A), a fixing member 17 is arranged on the outer circumferential surface 11A of the winding core 11 along the width direction DR1 of the winding core 11.

[0214] After arranging the fixed members 17, second exposure suppression members 19 are arranged along the circumferential direction DR4 of the winding core 11 at positions on the outer circumferential surface 11A of the winding core 11 corresponding to the non-effective region R2 of the sheet 12, as shown in Fig. 30(B). The second exposure suppression members 19 are arranged so that a portion of the second exposure suppression members 19 overlaps the fixed members 17. The second exposure suppression members 19 may be arranged so as to contact the first end surface 17A of the fixed member 17. The second exposure suppression members 19 may be arranged by application using an application device such as a dispenser or a syringe, or may be arranged by attaching a sheet or tape.

[0215] After arranging the second exposure suppression members 19, a coating material 201 is applied to the outer circumferential surface 11A of the winding core 11 between the second exposure suppression members 19 along the width direction DR1 of the winding core 11 as shown in Fig. 31(A) using a coating device such as a dispenser or a syringe. The coating material 201 is applied so as to come into contact with the first end surface 17A of the fixing member 17. Note that the coating material 201 may also be applied so as to be adjacent to the first end surface 17A of the fixing member 17.

[0216] After coating with coating material 201, as shown in Fig. 31(B), starting end 12A is positioned so that sheet 12 covers coating material 201. Specifically, starting end 12A of sheet 12 is affixed to fixing member 17, and starting end 12A is fixed to outer circumferential surface 11A of core 11 via fixing member 17.

[0217] After the winding start end 12A of the sheet 12 is fixed to the fixing member 17, first exposure suppression members 18 are respectively arranged along the circumferential direction DR4 of the winding core 11 at positions on the outer circumferential surface 11A of the winding core 11 corresponding to the non-effective region R2 of the sheet 12, as shown in Fig. 32(A). The first exposure suppression members 18 are arranged not only at positions where the first gaps 13 are formed, but also up to a position above the winding start end 12A. The first exposure suppression members 18 may be arranged by application using an application device such as a dispenser or syringe, or may be arranged by attaching a sheet or tape.

[0218] After the first exposure suppression members 18 are formed or arranged, a coating material 202 is applied along the width direction DR1 of the core 11 using an application device such as a dispenser or syringe to positions on the outer circumferential surface 11A of the core 11 that are between the first exposure suppression members 18 and correspond to the effective area R1 of the sheet 12, as shown in Fig. 32(B). The coating material 202 is applied so as to come into contact with the second end surface 17B of the fixing member 17. Note that the coating material 202 may also be applied so as to be adjacent to the second end surface 17B of the fixing member 17.

[0219] Thereafter, as shown in FIG. 33, the sheet 12 is wound around the outer peripheral surface 11A of the winding core 11. When the sheet 12 is wound, the coating materials 201 and 202 flow and spread, so that the first gap 13 is filled with the coating material 202 and the second gap 15 is filled with the coating material 201, forming a first filled portion 14 filled in the first gap 13 and a second filled portion 16 filled in the second gap 15. This results in a roll body 10. In order to reliably spread and fill the coating material 202 and the like in the first gap 13 and the like, it is preferable to wind the sheet 12 by 1000 m or more when the sheet 12 exceeds 1000 m, and to wind the entire length of the sheet 12 when the sheet 12 is less than 1000 m.

[0220] Furthermore, when the coating materials 201, 202 are curable polymer compositions, the curable polymer composition is cured after at least the second turn of the sheet 12. When the curable polymer composition is a one-component curable polymer composition (moisture-curable polymer composition), this composition reacts with the moisture in the air and cures when left at room temperature, so that it can be cured without using a special device such as a heating device or an ionizing radiation irradiation device. 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.

[0221] In all of the above manufacturing methods, the coating materials 201, 202 are caused to flow by rolling the sheet 12, but the coating materials 201, 202 may be caused to flow in advance before rolling the sheet 12. However, if the coating materials 201, 202, etc. are caused to flow before rolling the sheet 12, the number of steps increases, so it is preferable to cause the coating materials 201, 202 to flow by rolling the sheet 12.

[0222] In the above, the coating material 202 is applied after the coating material 201 is applied, but for example, the coating materials 201 and 202 may be applied simultaneously using two coating devices.

[0223] In the above, the coating material 201 is applied so as to contact the first end surface 17A, and the coating material 202 is applied so as to contact the second end surface 17B. However, if the coating material has high wettability and low viscosity, when the coating material is applied so as to contact the first end surface or the second end surface, the coating material may penetrate between the winding start end and the fixing member, and may also spread to the area between the winding start end and the back surface of the sheet. Although it is possible to control the coating material to a desirable state, excessive impregnation or spreading may result in hardening at an uncontrollable position, which may result in the formation of a new step. In addition, if the viscosity of the coating material is high (for example, a tape-like material) or the wettability of the coating material is low, when the coating material or the coating material is placed, it is highly likely that it will harden in a state where it spreads only in the vicinity of the placement, so if it is not sufficiently wetted and spread by the winding in the later process, the material will harden in a thick state near the winding start end, and there is a risk that the step will become larger. For this reason, it is preferable that the coating material 201 is applied so as to be close to the first end surface 17A of the fixing member 17, and it is preferable that the coating material 202 is applied so as to be close to the second end surface 17B of the fixing member 17. In this specification, "close" means a position that is clearly separated from the winding start end or the fixing member. For example, even if the coating material is a low-viscosity material, the distance from the winding start end or the fixing member is preferably 0.3 mm or more. This distance is preferably 0.5 mm or more, and preferably 1 mm or more from the viewpoint of maximum stability. If this distance is too large, it is difficult to obtain the effect of reducing the step, so it is preferable to adjust the distance within a range in which the first filling section 14 in FIG. 3 etc. can be completed. For example, the upper limit of this distance is preferably 10 mm or less, 7 mm or less, or even 5 mm or less. If the viscosity of the coating material is low, it is preferable to increase the amount of coating. The separation distance is measured at 10 points, and the arithmetic mean value of the separation distances at 8 points, excluding the maximum and minimum values, is calculated.

[0224] When the viscosity of the coating material is high, the coating material is difficult to spread, so it is preferable that the separation distance is short. When the viscosity of the coating material is low, if the separation distance is too small, there is a risk that a large amount of coating material will be present on the fixed member, and if the separation distance is too large, there is a risk that the coating material will spread in another direction and not be able to sufficiently fill the desired gap, so it is preferable that the separation distance is neither too small nor too large.

[0225] In the above, after the fixing member 17 is arranged on the outer peripheral surface 11A of the winding core 11, the coating material 201 is applied so as to contact the first end face 17A of the fixing member 17, and then the coating material 202 is applied so as to contact the second end face 17B of the fixing member 17. However, the coating materials 201 and 202 may be applied and the fixing member 17 may be arranged in the order of the following manufacturing methods (1) to (3). Among these, the following manufacturing method (2) is preferred.

[0226] In manufacturing method (1), after placing a fixed member 17 on the outer peripheral surface 11A of the winding core 11, a coating material 201 is applied to the first end surface 17A side of the fixed member 17 so as to maintain the above-mentioned separation distance, and then a coating material 202 is applied to the second end surface 17B side of the fixed member 17 so as to maintain the above-mentioned separation distance.

[0227] The manufacturing method (2) is a method in which, after coating the outer peripheral surface 11A of the winding core 11 with the coating material 201, the fixing member 17 is arranged so that the distance from the coating material 201 is the above-mentioned distance, and then the coating material 202 is applied to the side of the fixing member 17 opposite to the coating material 201 so that the distance from the fixing member 17 is the above-mentioned distance, or a method in which, after coating the outer peripheral surface 11A of the winding core 11 with the coating material 202, the fixing member 17 is arranged so that the distance from the coating material 202 is the above-mentioned distance, and then the coating material 201 is applied to the side of the fixing member 17 opposite to the coating material 202 so that the distance from the fixing member 17 is the above-mentioned distance. By applying the coating materials 201, 202 and arranging the fixing member 17 in this order, the coating materials 201, 202 can be arranged with a stable distance, and excess coating materials 201, 202, etc. can be prevented from being applied onto the fixing member 17, so that the generation of a new step on the fixing member 17 can be prevented.

[0228] The manufacturing method (3) is a method in which coating materials 201, 202 are applied to the outer peripheral surface 11A of the winding core 11 at a predetermined interval, and then a fixing member 17 is disposed between the coating materials 201, 202.

[0229] When producing the roll body 110 shown in FIG. 26, first, the sheet 12 is fixed to the fixing member 17, and then the exposure suppression member is arranged along the circumferential direction DR4 of the winding core 11 from the position of the outer circumferential surface 11A of the winding core 11 corresponding to the non-effective region R2 of the sheet 12 to the non-effective region R2 of the sheet 12. The exposure suppression member 112 is arranged so that a part of the exposure suppression member 112 overlaps the fixing member 17. The exposure suppression member 112 may be arranged by application using an application device such as a dispenser or a syringe, or may be arranged by attaching a sheet or tape. Then, the application material 201 is applied between the exposure suppression members 112 along the width direction DR1 of the winding core 11 to at least the region corresponding to the second gap 15 in the effective region R1 of the sheet 12, and the application material 202 is applied between the exposure suppression members 112 so as to contact the second end surface 17B of the fixing member 17. After that, the sheet 12 is wound to form the first filling portion 14 and the second interposed portion 111.

[0230] According to this embodiment, since the first gap 13 is filled with the first filling portion 14, the portion of the first turn of the sheet 12 on the first filling portion 14 can be gently lifted from the separation position P1 toward the tip end surface 12A1. This makes it possible to reduce the step caused by the winding start end portion 12A of the sheet 12.

[0231] According to this embodiment, since the second gap 15 is filled with the second filling portion 16, the portion of the first turn of the sheet 12 on the second filling portion 16 can be gently lowered from the first end surface 17A toward the arrival position P2. This makes it possible to effectively reduce the step caused by the fixing member 17.

[0232] In the roll body 30, since the third gap 31 is filled with the third filling portion 32, the portion of the sheet 12 in the first turn above the third filling portion 32 can be lifted smoothly. This makes it possible to more effectively reduce the step caused by the fixing member 17.

[0233] When the sheet is deformed, there are parts of the sheet that cannot be used as a product, so the effective length of the sheet is compensated in order to ensure the effective length. In other words, when the part of the sheet that cannot be used as a product becomes longer due to deformation, sheet loss increases. In contrast, according to this embodiment, the step caused by the winding start end 12A of the sheet 12 and the step caused by the fixing members 17 and 81 can be mitigated, so that the deformation of the sheet 12 can be suppressed. This reduces the sheet loss.

[0234] According to this embodiment, the first exposure suppression members 18, 101 are disposed outside the first filling portion 14 in the width direction DR1 of the core 11, so that it is possible to suppress the first filling portion 14 from protruding outside the sheet 12 and to suppress the end portion 14A of the first filling portion 14 from being exposed outside the sheet 12. This makes it possible to suppress contamination of the sheet 12.

[0235] According to this embodiment, the second exposure suppression members 19, 102 are disposed on the outer side of the second filling portion 16 in the width direction DR1 of the core 11, so that the second filling portion 16 can be prevented from protruding outward from the sheet 12, and the end portion 16A of the second filling portion 16 can be prevented from being exposed outward from the sheet 12. This makes it possible to suppress contamination of the sheet 12.

[0236] According to this embodiment, in the roll body 110, the exposure suppression members 112 are arranged on the outer side of the first filling portion 14 and the outer side of the second intermediate portion 111 in the width direction DR1 of the core 11, so that it is possible to suppress the first filling portion 14 and the second intermediate portion 111 from protruding outside the sheet 12, and to suppress the exposure of the end portion 14A of the first filling portion 14 and the end portion 111A of the second intermediate portion 111 outside the sheet 12. This makes it possible to suppress contamination of the sheet 12.

[0237] [Second embodiment] Hereinafter, a roll body according to the second embodiment of the present invention will be described with reference to the drawings. Fig. 34 is a perspective view of a roll body according to this embodiment, Fig. 35 is a plan view of the roll body of Fig. 34, Fig. 36 is an enlarged view of a part of the cross section of the roll body of Fig. 35 taken along line VII-VII, Fig. 37 is an enlarged view of a part of the cross section of the roll body of Fig. 35 taken along line VIII-VIII, Fig. 38 is a plan view of a part of the roll body of Fig. 34, Fig. 39 is an enlarged view of a part of another roll body according to this embodiment, Fig. 40 is a plan view of another roll body according to this embodiment, Fig. 41 is an enlarged view of a part of the cross section of the roll body of Fig. 40 taken along line IX-IX, Fig. 42 is an enlarged view of a part of the cross section of the roll body of Fig. 40 taken along line XX, and Fig. 43 is an enlarged view of a part of the cross section of the roll body of Fig. 40 taken along line XI-XI.

[0238] <<<Roll body>>> The roll body 120 shown in Figures 34 and 35 includes a winding core 11 and a long sheet 12 wound around the outer peripheral surface 11A of the winding core 11. As shown in Figure 36, the roll body 120 includes a first filling portion 14 filled in a first gap 13 located between the winding core 11 and the sheet 12, a second filling portion 16 filled in a second gap 15 located between the winding core 11 and the sheet 12, and a fixing member 17 for fixing a part of the sheet 12 to the winding core 11, and further includes a pair of first exposure suppression members 121 that suppress the exposure of an end 14A of the first filling portion 14 in the width direction DR1 of the winding core 11 to the outside of the sheet 12, and a pair of second exposure suppression members 122 that suppress the exposure of an end 16A of the second filling portion 16 in the width direction DR1 of the winding core 11 to the outside of the sheet 12, as shown in Figures 35 and 38.

[0239] The sheet 12 is wound around the core 11 multiple times, for example, two or more times. The roll body 120 may include at least one of the first exposure suppression member 121 and the second exposure suppression member 122, and may not include both. The roll body 120 includes a pair of first exposure suppression members 121, and when the roll body 120 includes the first exposure suppression members 121, it is sufficient that the roll body 120 includes the first exposure suppression member 121 on at least one side. The roll body 120 includes a pair of second exposure suppression members 122, and when the roll body 120 includes the second exposure suppression members 122, it is sufficient that the roll body 120 includes the second exposure suppression member 122 on at least one side.

[0240] The roll body 120 further includes a first intermediate portion 20 that is connected to the first filling portion 14 and is interposed between the first turn of the sheet 12 and the second turn of the sheet 12. Although the roll body 120 includes the first intermediate portion 20, it is not necessarily required to include the first intermediate portion.

[0241] <First exposure suppression member> As in the first embodiment, the first exposure suppression member 121 is a member for suppressing exposure of the end 14A of the first filling portion 14 to the outside of the sheet, but the first exposure suppression member 121 shown in Fig. 37 and Fig. 38 is a member for suppressing exposure of the end 14A protruding from the sheet 12 in the first filling portion 14. That is, the first exposure suppression member 121 functions as a covering member for covering the protruding end 14A of the first filling portion 14 as shown in Fig. 37. The first exposure suppression member 121 is in a sheet shape from the viewpoint of covering the end 14A.

[0242] The entire first exposure suppression member 121 may be exposed from the sheet 12, or a portion of the first exposure suppression member 121 may be covered by the sheet 12. Since a portion of the first exposure suppression member 121 is covered by the sheet 12, the first exposure suppression member 121 is fixed, and therefore, displacement of the first exposure suppression member 121 can be suppressed.

[0243] It is preferable that the size of exposed portion 121A of first exposure suppression member 121 exposed from sheet 12 is larger than the size of end portion 14A protruding from first filling portion 14. This allows exposed portion 121A to cover the entire end portion 14A, thereby further suppressing contamination of sheet 12.

[0244] It is preferable that the non-exposed portion 121B of the first exposure suppression member 121 covered by the sheet 12 is located in the non-effective region R2 so as not to hinder the step reduction by the first filling portion .

[0245] For reasons similar to those described in the section regarding first exposure suppression member 18, it is preferable that first exposure suppression member 121 be positioned so that a portion of first exposure suppression member 121 overlaps fixed member 17, as shown in FIG. 35.

[0246] Length L6 (see FIG. 38) of exposed portion 121A in circumferential direction DR4 of winding core 11 depends on the length of end portion 14A protruding in circumferential direction DR4 of winding core 11, but is preferably, for example, 10 mm or more. If length L6 of exposed portion 121A is 10 mm or more, it is possible to cover the entire length of end portion 14A in circumferential direction DR4 of winding core 11. It is more preferable that the lower limit of length L6 of exposed portion 121A is 20 mm or more, 50 mm or more, or 100 mm or more. The upper limit of length L6 of exposed portion 121A may be, for example, 1 / 2 or less of the outer circumferential length (mm) of winding core 11 minus 10 mm.

[0247] The width W6 (see FIG. 38) of the exposed portion 121A in the width direction DR1 of the winding core 11 depends on the length of the protruding end portion 14A in the width direction DR1 of the winding core 11, but is preferably, for example, 5 mm or more. If the width W6 of the exposed portion 121A is 5 mm or more, it is possible to cover the entire length of the protruding end portion 14A in the width direction DR1 of the winding core 11. It is more preferable that the width W6 of the exposed portion 121A is 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 may be 40 mm or less, 30 mm or less, or 20 mm or less.

[0248] The thickness of the first exposure suppressing member 121 is preferably 1 μm or more and 2000 μm or less. If the thickness of the first exposure suppressing member 121 is 1 μm or more, deformation such as breakage or folding of the first exposure suppressing member 121 can be suppressed, and the end portion 14A can be stably covered. Furthermore, if the thickness of the first exposure suppressing member 121 is 2000 μm or less, even if a non-exposed portion 121B is provided as shown in FIG. 38, the generation of a new step due to the first exposure suppressing member 121 can be suppressed. From the viewpoint of being able to more stably cover the end portion 14A without the first exposure suppressing member 121 breaking or deforming, the lower limit of the thickness of the first exposure suppressing 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 occurrence of new steps due to the first exposure suppressing member 121, the upper limit of the thickness of the first exposure suppressing member 121 is more preferably 1000 μm or less, 500 μm or less, or 200 μm or less.

[0249] The material of the first exposure suppression member 121 is not particularly limited as long as it can be formed into a sheet and does not contaminate the sheet, and examples of such materials include resin, metal, rubber, gel, tape (including cushion tape), clay, and paper. These materials are easy to handle and / or install. Among these, tape is preferable because it is easy to handle and install. Furthermore, when rubber or gel is used as the material of the first exposure suppression member 121, the first exposure suppression member 121 itself is deformable, so that it is possible to prevent the generation of a new step caused by the first exposure suppression member 121.

[0250] <Second exposure suppression member> The second exposure suppression member 122 is a member for suppressing exposure of the end 16A of the second filling portion 16 to the outside of the sheet, as in the first embodiment, but the second exposure suppression member 122 shown in Fig. 37 and Fig. 38 is a member for suppressing exposure of the end 16A protruding from the sheet 12 in the second filling portion 16. That is, the second exposure suppression member 122 functions as a covering member for covering the protruding end 16A of the second filling portion 16 as shown in Fig. 37.

[0251] For reasons similar to those described in the section for the first exposure suppression member 121, the entire second exposure suppression member 122 may be exposed from the sheet 12, or a portion of the second exposure suppression member 122 may be covered by the sheet 12.

[0252] It is preferable that the size of exposed portion 122A of second exposure suppression member 122 exposed from sheet 12 is larger than the size of end portion 16A protruding from second filling portion 16. This allows exposed portion 122A to cover the entire end portion 16A, thereby further suppressing contamination of sheet 12.

[0253] It is preferable that the non-exposed portion 122B of the second exposure suppression member 122 covered by the sheet 12 is located in the non-effective region R2 so as not to hinder the step reduction by the second filling portion 16.

[0254] Second exposure suppressing member 122 is preferably in a sheet shape in order to cover end portion 16A in its entirety.

[0255] For the same reasons as those described in the section on second exposure suppression member 19, it is preferable that second exposure suppression member 122 is disposed so that a portion of second exposure suppression member 122 overlaps fixing member 17 as shown in Fig. 35. Although first exposure suppression member 121 and second exposure suppression member 122 shown in Fig. 35 are separate bodies, the first exposure suppression member and second exposure suppression member may be integrated as in exposure suppression member 123 shown in Fig. 39. In this case, exposure suppression member 123 has not only the function of the first exposure suppression member but also the function of the second exposure suppression member.

[0256] Length L7 (see FIG. 38) of exposed portion 122A in circumferential direction DR4 of winding core 11 depends on the width of protruding end portion 16A in circumferential direction DR4 of winding core 11, but is preferably, for example, 10 mm or more. If length L7 of exposed portion 122A is 10 mm or more, it is possible to cover the entire length of end portion 16A in circumferential direction DR4 of winding core 11. It is more preferable that the lower limit of length L7 of exposed portion 122A is 20 mm or more, 50 mm or more, or 100 mm or more. The upper limit of length L7 of exposed portion 122A may be, for example, 1 / 2 or less of the outer circumferential length (mm) of winding core 11 minus 10 mm.

[0257] The width W7 (see FIG. 38) of the exposed portion 122A in the width direction DR1 of the winding core 11 depends on the length of the protruding end 16A in the width direction DR1 of the winding core 11, but is preferably, for example, 5 mm or more. If the width W7 of the exposed portion 122A is 5 mm or more, it is possible to cover the entire length of the protruding end 16A in the width direction DR1 of the winding core 11. It is more preferable that the width W7 of the exposed portion 122A is 10 mm or more, 30 mm or more, or 50 mm or more. From the viewpoint of suppressing the concern of contamination, the upper limit of the width W7 of the exposed portion 122A may be 40 mm or less, 30 mm or less, or 20 mm or less.

[0258] The thickness of the second exposure suppression member 122 is similar to the thickness of the first exposure suppression member 121, and therefore a description thereof will be omitted here.

[0259] The constituent material of the second exposure suppression member 122 is similar to the constituent material of the first exposure suppression member 121, and therefore a description thereof will be omitted here.

[0260] <<Other roll bodies>> In the roll body 120, the second gap 15 is filled with the second filling portion 16, but as in a roll body 130 shown in Fig. 41, the second gap 15 is not filled with the second filling portion 16, the second gap 15 is hollow, and a second intermediate portion 131 may be provided in at least a region 12D corresponding to the second gap 15 between the sheets 12 in the first turn and thereafter. In this case, it is preferable that an exposure suppression member 132 (see Fig. 40) is provided on the outside of an end portion 131A of the second intermediate portion 131 in the width direction DR1 of the winding core 11.

[0261] <<Second intervening part>> The second intermediate portion 131 is similar to the second intermediate portion 111, and therefore a description thereof will be omitted here.

[0262] <Exposure suppression material> The exposure suppression member 132 shown in Fig. 40 is an integrated member of a first exposure suppression member that suppresses exposure of the end 14A of the first filling portion 14 and a second exposure suppression member that suppresses exposure of the end 131A of the second intermediate portion 131. A first portion 132A corresponding to the first exposure suppression member in the exposure suppression member 132 shown in Fig. 42 is similar to the first exposure suppression member 121, and therefore a description thereof will be omitted here. A second portion 132B corresponding to the second exposure suppression member in the exposure suppression member 132 shown in Fig. 42 is similar to the second exposure suppression member 122 except that the second portion 132B is provided in a region 12D (see Fig. 42) corresponding to at least the second gap 15 between the sheets 12 in which the second intermediate portion 131 is provided, and is provided outside the end 131A of the second intermediate portion 131 in the width direction DR1 of the core 11, and therefore a description thereof will be omitted here. As shown in FIG. 43, a side surface of the end portion 14A of the first filling portion 14 and a side surface of the end portion 131A of the second intermediate portion 131 are preferably covered with an exposure suppression member 132.

[0263] <<Roll body manufacturing method>> The roll body 120 can be manufactured, for example, by the following method. Figures 44 and 45 are diagrams that typically show the manufacturing process of the roll body according to this embodiment. First, as shown in Figure 44(A), a fixing member 17 is disposed on the outer circumferential surface 11A of the winding core 11 along the width direction DR1 of the winding core 11.

[0264] After the fixing member 17 is placed, coating materials 201 and 202 are applied to the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11 as shown in FIG. 44(B) using a dispenser or the like. Both of the coating materials 201 and 202 are applied to the positions of the outer peripheral surface 11A of the winding core 11 corresponding to the effective area R1 of the sheet 12. The coating material 201 is applied so as to come into contact with the first end surface 17A of the fixing member 17, and the coating material 202 is applied so as to come into contact with the second end surface 17B of the fixing member 17. The coating material 201 may be applied so as to be adjacent to the first end surface 17A of the fixing member 17, and the coating material 202 may be applied so as to be adjacent to the second end surface 17B of the fixing member 17.

[0265] After coating materials 201, 202, as shown in Fig. 45(A), starting end 12A is positioned so that sheet 12 covers coating material 201. Specifically, starting end 12A of sheet 12 is affixed to fixing member 17, and starting end 12A is fixed to outer circumferential surface 11A of core 11 via fixing member 17.

[0266] After the winding start end 12A of the sheet 12 is fixed to the fixing member 17, as shown in FIG. 45(B), the sheet 12 is wound around the outer circumferential surface 11A of the core 11 while sandwiching a part of the first exposure suppression member 121 and a part of the second exposure suppression member 122. Specifically, a part of the first exposure suppression member 121 is sandwiched between the core 11 and the first round of the sheet 12, and a part of the second exposure suppression member 122 is sandwiched between the first round of the sheet 12 and the second round of the sheet 12, so that the first exposure suppression member 121 is positioned outside the coating material 202 in the width direction DR1 of the core 11, and the second exposure suppression member 122 is positioned outside the coating material 201 in the width direction DR1 of the core 11. By sandwiching a part of the first exposure suppression member 121 and the second exposure suppression member 122 in this manner, the first exposure suppression member 121 and the second exposure suppression member 122 can be sandwiched continuously. Note that a part of the first exposure suppression member 121 and a part of the second exposure suppression member 122 may be sandwiched between the core 11 and the first round of the sheet 12.

[0267] When the sheet 12 is wound, the coating materials 201, 202 flow and spread, so that the first gap 13 is filled with the coating material 202 and the second gap 15 is filled with the coating material 201, forming a first filled portion 14 filled in the first gap 13 and a second filled portion 16 filled in the second gap 15. This results in a roll body 120. In order to reliably spread and fill the coating material 202 etc. in the first gap 13 etc., it is preferable to wind the sheet 12 by 1000 m or more when the sheet 12 exceeds 1000 m, and to wind the entire length of the sheet 12 when the sheet 12 is less than 1000 m.

[0268] Furthermore, when the coating materials 201, 202 are curable polymer compositions, the curable polymer composition is cured after at least the second turn of the sheet 12. When the curable polymer composition is a one-component curable polymer composition (moisture-curable polymer composition), this composition reacts with the moisture in the air and cures when left at room temperature, so that it can be cured without using a special device such as a heating device or an ionizing radiation irradiation device. 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.

[0269] 41 is produced, first, the sheet 12 is fixed to the fixing member 17, and then the coating material 201 is applied to at least a region of the effective region R1 of the sheet 12 that corresponds to the second gap 15 along the width direction DR1 of the core 11, and the coating material 202 is applied so as to contact the second end surface 17B of the fixing member 17. Then, the first portion 132A of the exposure suppression member 132 is sandwiched between the core 11 and the first turn of the sheet 12, and a part of the second portion 132B of the exposure suppression member 132 is sandwiched between the first turn of the sheet 12 and the second turn of the sheet 12, so that the exposure suppression member 132 is positioned outside the coating materials 201, 202 in the width direction DR1 of the core 11.

[0270] According to this embodiment, the first gap 13 is filled with the first filling portion 14, and therefore, for the same reason as in the first embodiment, the step caused by the winding start end portion 12A of the sheet 12 can be reduced.

[0271] According to this embodiment, since the second gap 15 is filled with the second filling portion 16, the step caused by the fixing member 17 can be effectively reduced for the same reason as in the first embodiment.

[0272] According to this embodiment, it is possible to reduce the step caused by the winding start end 12A of the sheet 12 and the step caused by the fixing member 17, thereby suppressing deformation of the sheet 12. This makes it possible to reduce sheet loss.

[0273] According to this embodiment, the end 14A of the first filling portion 14 protrudes outside the sheet 12, but since this protruding end 14A is covered by the first exposure suppression member 121, it is possible to suppress the end 14A from being exposed outside the sheet 12. This makes it possible to suppress the sheet 12 from being contaminated.

[0274] According to this embodiment, the end 16A of the second filling portion 16 protrudes outside the sheet 12, but this protruding end 14A is covered by the second exposure suppression member 122, so that it is possible to suppress exposure of the end 16A outside the sheet 12. This makes it possible to suppress contamination of the sheet 12.

[0275] According to this embodiment, in the roll body 130, the end 14A of the first filling portion 14 protrudes outside the sheet 12, but since the protruding end 14A is covered by the exposure suppression member 132, it is possible to suppress the end 14A from being exposed outside the sheet 12. Furthermore, since the exposure suppression member 132 is disposed outside the second intermediate portion 131 in the width direction DR1 of the core 11, it is possible to suppress the second intermediate portion 131 from protruding outside the sheet 12, and it is possible to suppress the end 131A of the second intermediate portion 131 from being exposed outside the sheet 12. This makes it possible to suppress contamination of the sheet 12. EXAMPLES

[0276] In order to explain the present invention in detail, examples are given below, but the present invention is not limited to these descriptions.

[0277] <Example 1> First, a rectangular double-sided tape measuring 1,380 mm in length, 20 mm in width and 10 μm in thickness was attached as a fixing member to the outer peripheral surface of a cylindrical winding core made of fiber-reinforced plastic having an inner diameter of 153 mm, an outer diameter of 167 mm and a width of 1,600 mm along the width direction of the winding core.

[0278] After the double-sided tape was applied, the core was held by a chuck member of the winding device and fixed to the winding device. Then, a linear second exposure suppressing member made of a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Wacker Asahi Kasei Silicone Co., Ltd.) was formed along the circumferential direction of the core in the region of the outer peripheral surface of the core corresponding to the non-effective region of the acrylic resin film. The second exposure suppressing member was formed so as to be 15 mm away from the side edge in the width direction of the acrylic resin film. In addition, the second exposure suppressing member had a length L4 in the circumferential direction of the core of 10 mm, and a width W5 in the width direction of the core of 10 mm. One end of the second exposure suppressing member in the longitudinal direction was on the double-sided tape, and the other end protruded beyond the double-sided tape in the winding direction of the acrylic resin film. The color of this second exposure suppressing member was white. The length L4 and width W5 refer to the parts shown in FIG. 7.

[0279] After the second exposure suppression member was formed, a two-part curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Wacker Asahi Kasei Silicones Co., Ltd.) was applied in an environment of 25°C to a position on the outer circumferential surface of the winding core that was located between the second exposure suppression members and that corresponded to the area that would be the effective area of ​​the acrylic resin film as a sheet described below, so as to contact the first end face of the double-sided tape extending along the width direction of the winding core. The color of this silicone resin composition was white. The shear viscosity of this silicone resin composition when applied was 40 Pa s, and this silicone resin composition was applied along the width direction of the winding core and in an amount of application per unit width of 1 cm. 3 / m.

[0280] Then, the winding start end in the longitudinal direction of an acrylic resin film (in-plane retardation Re: 5 nm, no undercoat layer) having a length of 3000 m, a width of 1340 mm and a thickness of 80 μm as a sheet was attached to a double-sided tape along the width direction of the winding core, and the acrylic resin film was fixed to the outer peripheral surface of the winding core. The acrylic resin film had an effective area of ​​1270 mm and a pair of non-effective areas of 35 mm located on both sides of the effective area in the width direction of the acrylic resin film.

[0281] After the acrylic resin film was fixed to the outer peripheral surface of the core, a linear first exposure suppressing member was formed from a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Wacker Asahi Kasei Silicone Co., Ltd.) along the circumferential direction of the core from the region of the outer peripheral surface of the core corresponding to the non-effective region of the acrylic resin film to the non-effective region of the first round of the acrylic resin film. The first exposure suppressing member was formed at a position 15 mm away from the side edge in the width direction of the acrylic resin film. In addition, the first exposure suppressing member had a length L3 in the circumferential direction of the core of 10 mm, a width W4 in the width direction of the core of 10 mm, and a thickness of 500 μm at a position in contact with the tip surface of the acrylic resin film. One end of the first exposure suppressing member in the longitudinal direction protruded from the tip surface of the winding start end of the acrylic resin film in the direction opposite to the winding direction of the acrylic resin film, and the other end was on the winding start end. The color of this first exposure suppressing member was white. It should be noted that the length L3 and the width W4 refer to the portions shown in FIG.

[0282] After the first exposure suppressing member was formed, a two-part curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Wacker Asahi Kasei Silicones Co., Ltd.) was applied in an environment of 25°C to a position on the outer circumferential surface of the winding core that was located between the first exposure suppressing members and that corresponded to the effective area of ​​the acrylic resin film, so as to contact the tip surface of the winding start end and the second end surface opposite to the first end surface of the double-sided tape. The color of this silicone resin composition was white. The shear viscosity of this silicone resin composition when applied was 40 Pa s, and this silicone resin composition was applied along the width direction of the winding core and in an amount of 1 cm per unit width. 3 / m.

[0283] Thereafter, the entire acrylic resin film was wound around a core by a winding device, and a first gap between the core and the first turn of the acrylic resin film and in contact with the tip surface of the winding start end of the acrylic resin film was filled with a silicone resin composition, and a second gap between the core and the first turn of the acrylic resin film and in contact with the first end surface of the double-sided tape was filled with a silicone resin composition. This resulted in a roll body. In the roll body, the silicone resin composition was cured to form a first filling part filled in the first gap with a length of 20 mm, a width of 1300 mm, and a maximum thickness of 300 μm, and a second filling part filled in the second gap with a length of 20 mm, a width of 1300 mm, and a maximum thickness of 300 μm.

[0284] 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 obtained 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 obtained by measuring the shear viscosity of the silicone resin composition 10 times and calculating the arithmetic average value of 8 shear viscosities excluding the maximum and minimum values ​​among the 10 viscosities measured. The shear viscosity of the coating material used in the following other examples was also measured in the same manner as in Example 1.

[0285] The in-plane retardation Re of the acrylic resin film was measured using a retardation film and optical material inspection device (product name "RETS-100", manufactured by Otsuka Electronics Co., Ltd.). Specifically, first, in order to stabilize the light source of the RETS-100, the light source was turned on and left for 60 minutes or more. After that, the rotating analyzer method was selected, and the θ mode (angle direction retardation measurement mode) was selected. By selecting this θ mode, the stage became an inclined rotating stage.

[0286] Next, the following measurement conditions were entered into the RETS-100. (Measurement conditions) Retardation measurement range: Rotating analyzer method Measurement spot diameter: φ5mm Tilt angle range: -40°~40° Measurement wavelength range: 400nm~800nm Average refractive index of sample: 1.5 Thickness: 80μm

[0287] Background data was then obtained without any samples placed in the instrument, the instrument was closed, and this was done every time the light source was turned on.

[0288] Then, a sample was placed on the stage of the device. The size of the sample was 50 mm × 50 mm. However, the sample was cut from a portion of the sheet that was 35 mm or more away from each end of the sheet toward the inside of the sheet.

[0289] After placing the sample, the stage was rotated 360° on the XY plane in an environment of 23°C temperature and 50% relative humidity to measure the fast axis and slow axis. After the measurement was completed, the slow axis was selected. Then, the measurement was performed while the stage was tilted in a set angle range around the slow axis, and data (Re) was obtained in 10° increments for the set tilt angle range and set wavelength range. The in-plane retardation Re was measured at five different positions. Specifically, as shown in FIG. 10, it was measured at a total of five points, including the center A1 of the sample and points A2 to A4. Then, the arithmetic average value of three points excluding the maximum and minimum values ​​among the five measured values ​​was taken as the in-plane retardation Re.

[0290] <Example 2> In Example 2, a roll body was obtained in the same manner as in Example 1, except that a first exposure suppressing member made of a cushion tape (product name "Urethane Foam Tape 4032", manufactured by 3M Japan Ltd.) was used instead of the first exposure suppressing member made of a two-component curable silicone resin composition. The first exposure suppressing member had a length L3 of 45 mm in the circumferential direction of the core, a width W4 of 40 mm in the width direction of the core, and a thickness of 800 μm at a position contacting the tip surface of the acrylic resin film.

[0291] <Example 3> In Example 2, a roll body was obtained in the same manner as in Example 1, except that a first exposure suppressing member made of a urethane resin composition (product name "Sorbothane", manufactured by Sanshin Kosan Co., Ltd.) was used instead of the first exposure suppressing member made of the two-component curable silicone resin composition. The first exposure suppressing member had a length L3 of 100 mm in the circumferential direction of the core, a width W4 of 10 mm in the width direction of the core, and a thickness of 1000 μm at the position contacting the tip surface of the acrylic resin film.

[0292] <Example 4> In Example 4, a roll body was obtained in the same manner as in Example 1, except that the first and second filled portions were formed using a one-component curable silicone resin composition (product name "Hapio Seal Pro HG", manufactured by Kampe Hapio Co., Ltd.) instead of the two-component curable silicone resin composition. This one-component curable silicone resin composition was gray, and the shear viscosity of this one-component curable silicone resin composition at the time of application was 180 Pa s.

[0293] <Example 5> In Example 5, the coating amount per unit width was 0.3 cm 3 A roll body was obtained in the same manner as in Example 1, except that the first filled portion and the second filled portion were formed by applying the two-component curable silicone resin composition so that the thickness of the roll was 1 / m.

[0294] <Example 6> In Example 6, a roll body was obtained in the same manner as in Example 1, except that a polyethylene terephthalate (PET) film (in-plane retardation Re: 2250 nm) having a length of 3400 mm, a width of 1495 mm and a thickness of 75 μm was used instead of the acrylic resin film. The PET film had a base layer on both sides.

[0295] <Example 7> In Example 7, a roll body was obtained in the same manner as in Example 1, except that a polyethylene terephthalate (PET) film (product name "Cosmoshine SRF (registered trademark)", Toyobo Co., Ltd., in-plane retardation Re: 8400 nm) having a length of 3400 mm, a width of 1495 mm and a thickness of 75 μm was used instead of the acrylic resin film. The PET film had a base layer on both sides.

[0296] <Example 8> In Example 8, a roll body was obtained in the same manner as in Example 1, except that a cycloolefin polymer (COP) film (in-plane retardation Re: 99.7 nm) having a length of 3000 m, a width of 1250 mm and a thickness of 47 μm was used instead of the acrylic resin film. The COP film did not have a base layer.

[0297] <Example 9> First, a rectangular double-sided tape measuring 1,380 mm in length, 20 mm in width and 10 μm in thickness was attached as a fixing member to the outer peripheral surface of a cylindrical winding core made of fiber-reinforced plastic having an inner diameter of 153 mm, an outer diameter of 167 mm and a width of 1,600 mm along the width direction of the winding core.

[0298] After the double-sided tape was applied, the core was held by a chuck member of the winding device and fixed to the winding device. Thereafter, a one-component curing silicone resin composition (product name "Hapio Seal Pro HG", manufactured by Campe Hapio Co., Ltd.) was applied as a coating material in an environment of 25°C so as to contact the first end face of the double-sided tape extending along the width direction of the core. The color of this silicone resin composition was gray. The shear viscosity of this silicone resin composition when applied was 180 Pa s, and the silicone resin composition was applied along the width direction of the core and in an amount of 1 cm per unit width. 3 / m.

[0299] Then, the longitudinal winding start end of a sheet of acrylic resin film (in-plane retardation Re: 5 nm) having a length of 3000 m, a width of 1340 mm and a thickness of 80 μm was 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.

[0300] After the acrylic resin film was fixed to the outer peripheral surface of the core, a one-part curable silicone resin composition (product name "Hapio Seal Pro HG", manufactured by Kampe Hapio Co., Ltd.) was applied as a coating material in an environment of 25°C to the area of ​​the core corresponding to the effective area of ​​the acrylic resin film, so as to contact the leading end face of the winding start end and the second end face opposite to the first end face of the double-sided tape. The color of this silicone resin composition was gray. The shear viscosity of this silicone resin composition when applied was 180 Pa·s, and the silicone resin composition was applied in the width direction of the core and in an amount of 1 cm per unit width. 3 / m.

[0301] Thereafter, the entire acrylic resin film was wound around a core by a winding device, and a first gap located between the core and the first turn of the acrylic resin film and in contact with the tip face of the winding start end of the acrylic resin film was filled with a silicone resin composition, and a second gap located between the core and the first turn of the acrylic resin film and in contact with a first end face of the double-sided tape was filled with a silicone resin composition.

[0302] In addition, when the acrylic resin film was wound, a first exposure suppressing member, which was a single-sided adhesive tape (product name "COCOFUSEN L size", manufactured by Kanmi Co., Ltd.), was partially sandwiched between the core and the non-effective region of the acrylic resin film and on the outside of the silicone resin composition filled in the first gap in the width direction of the acrylic resin film, and a second exposure suppressing member, which was a single-sided adhesive tape (product name "COCOFUSEN L size", manufactured by Kanmi Co., Ltd.), was partially sandwiched between the non-effective region of the acrylic resin film of the first and second turns in an area corresponding to at least the second gap in the width direction of the acrylic resin film. This resulted in a roll body.

[0303] In the roll body, the silicone resin composition was cured to form a first filling portion having a length of 20 mm, a width of 1340 mm, and a maximum thickness of 300 μm, which was filled in the first gap, and a second filling portion having a length of 20 mm, a width of 1340 mm, and a maximum thickness of 300 μm, which was filled in the second gap. The first exposure suppression member had a length L6 of 30 mm in the circumferential direction of the core, a width W6 of 42 mm in the width direction of the core, and a thickness of 25 μm. The second exposure suppression member had a length L7 of 30 mm in the circumferential direction of the core, a width W7 of 42 mm in the width direction of the core, and a thickness of 25 μm. The lengths L6 and L7 and the widths W6 and W7 refer to the parts shown in FIG. 38.

[0304] <Example 10> In Example 10, a roll body was obtained in the same manner as in Example 9, except that double-sided adhesive tape (product name "Double-sided adhesive tape VR-5000", manufactured by Nitto Denko Corporation) was used as the first exposure suppression member and the second exposure suppression member instead of the single-sided adhesive tape.

[0305] <Example 11> First, a rectangular double-sided tape measuring 1,380 mm in length, 20 mm in width and 10 μm in thickness was attached as a fixing member to the outer peripheral surface of a cylindrical winding core made of fiber-reinforced plastic having an inner diameter of 153 mm, an outer diameter of 167 mm and a width of 1,600 mm along the width direction of the winding core.

[0306] After the double-sided tape was applied, the core was held by a chuck member of the winding device and fixed to the winding device. Then, the winding start end in the longitudinal direction of an acrylic resin film (in-plane retardation Re: 5 nm) having a length of 3000 m, a width of 1340 mm and a thickness of 80 μm as a sheet was applied to the double-sided tape along the width direction of the core, and the acrylic resin film was fixed to the outer peripheral surface of the core. The acrylic resin film had an effective area of ​​1270 mm in width and a pair of non-effective areas of 35 mm in width located on both sides of the effective area in the width direction of the acrylic resin film.

[0307] After the acrylic resin film was fixed to the outer peripheral surface of the core, a linear exposure suppressing member was formed from a two-component curing silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Wacker Asahi Kasei Silicone Co., Ltd.) along the circumferential direction of the core from the region of the outer peripheral surface of the core corresponding to the non-effective region of the acrylic resin film to the non-effective region of the first round of the acrylic resin film. The exposure suppressing member was a first exposure suppressing member and a second exposure suppressing member integrated together, and had a first portion corresponding to the first exposure suppressing member and a second portion corresponding to the second exposure suppressing member. The exposure suppressing member was formed at a position 15 mm away from the side edge in the width direction of the acrylic resin film. In addition, the exposure suppressing member had 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 a position contacting the tip surface of the winding start end of the acrylic resin film. The color of this exposure suppressing member was white.

[0308] Thereafter, a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Wacker Asahi Kasei Silicone Co., Ltd.) was applied as a coating material in an environment of 25°C to a region of the core corresponding to the effective region of the acrylic resin film, so as to contact the tip surface of the winding start end and the second end surface opposite to the first end surface of the double-sided tape. In addition, a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Wacker Asahi Kasei Silicone Co., Ltd.) was applied as a coating material in an environment of 25°C to a region of the effective region of the acrylic resin film, which is located between the core and the acrylic resin film of the first turn and corresponds to the second gap contacting the first end surface of the double-sided tape. The color of these silicone resin compositions was white. In addition, the shear viscosity of these silicone resin compositions when applied was 40 Pa·s, and these silicone resin compositions were applied along the width direction of the core and in an amount of application per unit width of 1 cm. 3 / m.

[0309] Thereafter, the entire acrylic resin film was wound around a core by a winding device, and the silicone resin composition was filled into a first gap located between the core and the first turn of the acrylic resin film and in contact with the tip face of the winding start end of the acrylic resin film, and the silicone resin composition was filled into a region located between the first and second turns of the acrylic resin film and corresponding to the second gap.

[0310] In the roll body, the silicone resin composition cured to form a first filling portion having a length of 20 mm, a width of 1,340 mm and a maximum thickness of 300 μm that filled the first gap, and a second intervening portion having a length of 20 mm, a width of 1,340 mm and a maximum thickness of 200 μm that was located between the first and second turns of the acrylic resin film and intervened in the area corresponding to the second gap.

[0311] <Comparative Example 1> In Comparative Example 1, a roll body was obtained in the same manner as in Example 1, except that the first and second filling sections were not formed.

[0312] <Comparative Example 2> In Comparative Example 2, a roll body was obtained in the same manner as in Example 1, except that the first exposure suppressing member and the second exposure suppressing member were not formed.

[0313] <Deformation relaxation length measurement> In the roll bodies according to the examples and the comparative examples, the length at which the step caused by the winding start end of the film and the step caused by the double-sided tape were alleviated was measured. Specifically, since the step becomes smaller from the winding start end to the winding end, the film was first unwound while measuring the unwound length (m) until the step was visible. Then, the film was cut out at the point at which the step was visible. In a state where a polyvinyl alcohol film was attached to the cut-out part of the film, visual observation was performed with a white LED lamp reflected on the film in an indoor environment of 800 Lux to 2000 Lux. Then, the distance from the point at which the step was no longer visible to the winding start end was measured, and this was taken as the deformation relaxation length. Here, it was determined that a step exists when there is a part where the outline line of the white LED lamp reflected on the film is distorted compared to other parts of the film, and it was determined that there is no step when the outline line of the white LED lamp reflected on the film around the step exists and can be determined to be the same as other parts of the film. The white LED lamp was positioned so that its length was aligned with the length of the film. The length of the white LED lamp was set to span the area of ​​the film where there was a step and the area where there was no step. During observation, the side where the line of the white LED lamp was clearly visible was appropriately selected, and the white LED lamp was reflected on the film, making its outline visible. Visual observation was also performed from all angles (-180° to 180°) with the normal direction of the film surface set as the reference (0°).

[0314] <Appearance evaluation> In the roll bodies according to the examples and the comparative examples, whether or not the first filling part, the second filling part, and a part of the second interposition part were exposed to the outside of the film was observed. Fifteen observers were used, and if all observers judged that the first filling part, the second filling part, and a part of the second interposition part were not exposed, they judged that the first filling part, the second filling part, and the second interposition part were not exposed. The evaluation criteria were as follows. A: A part of the first filling portion and the second filling portion, or a part of the first filling portion and the second interposed portion, was not exposed. B: Part of the first filling part and the second filling part or part of the first filling part and the second intervening part was exposed.

[0315] <Confirmation of the existence of the first intervening part> In the roll bodies according to Examples 1, 4, and 5, it was confirmed whether or not the first intervening part exists on the starting end part. Specifically, first, the acrylic resin film was unwound from the roll body until the surface became the second acrylic resin film. Then, in the roll body with the second acrylic resin film on the surface, the vicinity of the starting end part was visually observed to check whether there was a colored part on the starting end part. And if there was a colored part on the starting end part, it was considered that the first intervening part exists, and if there was no colored part, it was considered that the first intervening part does not exist. The number of observers was 15, and when all the observers determined that there was a colored part on the starting end part, it was judged that the first intervening part exists.

[0316] <Measurement of L1, L1+L2, T1, T2, S1, S1+S2> In the roll bodies according to Examples 1, 4, and 5, when the existence of the first intervening part was not confirmed, the length L1, thicknesses T1, T2, and area S1 were measured, and L1 / thickness T2 and S1 / thickness T2 were obtained. Also, when the existence of the first intervening part was confirmed, the length L1 + length L2, thicknesses T1, T2, and area S1 + area S2 were measured, and (length L1 + length L2) / thickness T2 and (area S1 + area S2) / thickness T2 were obtained. Note that the lengths L1, L2, thicknesses T1, T2, and areas S1, S2 mean the parts shown in FIGS. 4 and 5.

[0317] Specifically, first, a jig for rotating the roll body and a laser displacement meter (product name "LK-G30", manufactured by Keyence Corporation) were prepared and placed at predetermined positions respectively. The jig was inserted into the hole in the width direction of the core and held the roll body rotatably.

[0318] The laser displacement gauges were positioned above the roll body, and three of them were arranged so that the laser light was irradiated toward the surface of the roll body. The locations of the laser displacement gauges were as follows. First, a first position and a second position were determined to divide the width of the acrylic resin film into thirds. The first position was located on the first end side of the short side of the acrylic resin film, and the second position was located on the second end side opposite to the first position. The first laser displacement gauge was arranged so that the laser light was irradiated to the midpoint between the first position and the first end, the second laser displacement gauge was arranged so that the laser light was irradiated to the midpoint between the first position and the second position, and the third laser displacement gauge was arranged so that the laser light was irradiated to the midpoint between the second position and the second end.

[0319] Then, the roll body was attached to a jig, and the acrylic resin film was unwound until the first filling part was exposed from the roll body. Thereafter, in a state in which the first filling part was exposed, the core was rotated at a rotation speed of 30 mm / s in an environment of 23°C temperature and 50% relative humidity, and the displacement was continuously measured with a laser displacement meter at a sampling period of 200 μs to obtain a graph with the horizontal axis representing the position (mm) and the vertical axis representing the displacement (mm). This measurement was performed from the tip of the first filling part to the position contacting the tip surface, and in this measurement, the reference height (0 mm displacement line) was defined as the height of the core, and the difference in height between the core and the first filling part was defined as the thickness of the first filling part. The obtained graph represents a plane that substantially includes the longitudinal direction of the sheet and the radial direction of the core. In addition, in this graph, one division on the horizontal axis is 5 mm, and one division on the vertical axis is 0.02 mm.

[0320] In this graph, the position on the position displacement curve where the amount of displacement begins to drop rapidly was designated as position E1. When the presence of the first intermediate portion was not confirmed, the difference in the amount of displacement between the 0 mm displacement line and position E1 was calculated to determine the thickness T2 of the first filling portion at the position in contact with the tip surface.

[0321] When the presence of the first intervening portion was confirmed, the thickness T2 was measured by the following method. First, a sample of 2 cm x 2 cm including the winding start end 12A, the first filling portion 14, and the second round of the sheet 12 was taken and fixed so that the portion including this portion would not be crushed. Then, the cross section of the fixed sample was polished, and the thickness T2 of the first filling portion was measured with a stereomicroscope (product name "Digital Microscope VHX-7000", manufactured by Keyence Corporation) in an environment of a temperature of 23°C and a relative humidity of 50%. The measurement of the thickness T2 with the stereomicroscope was performed with a coaxial epi-illumination as the illumination of the digital microscope, a magnification of 500 times, a dark field, and reflected light.

[0322] In addition, when the presence of the first intermediate portion was not confirmed, the length L1 was obtained from the graph of the position displacement curve in the same manner as the thickness T2. Specifically, first, the position E1 and the intersection of the 0 mm displacement line and the position displacement curve at the point where the displacement amount starts to increase were determined as position E2 from the graph. Next, an imaginary line IL4 was drawn that passes through the position E1 and is perpendicular to the 0 mm displacement line. Then, the intersection of the imaginary line IL4 and the 0 mm displacement line was determined as position E3, and the length L1 was obtained by determining the distance between positions E2 and E3. The area S1 was calculated 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. The width between the measurement points was calculated based on the above formula (3) from the sampling period, the rotation speed of the winding core, and the outer diameter of the winding core, and was 6.24 μm. When the presence of the first intermediate portion was confirmed, length L1+length L2 was obtained in the same manner as length L1 when the presence of the first intermediate portion was not confirmed.

[0323] Then, when the presence of the first intermediate portion was not confirmed, the length L1 / thickness T2 and area S1 / thickness T2 were calculated using the length L1, thickness T2, and area S1. When the presence of the first intermediate portion was confirmed, the sum of the length L1 and length L2, the thickness T2, and the sum of the area S1 and area S2 were used to calculate (length L1+length L2) / thickness T2 and (area S1+area S2) / thickness T2.

[0324] The edge thickness T1 was measured using a scanning optical interference surface profiler (product name "New View7300", manufactured by Zygo). Specifically, first, when the acrylic resin film was completely unwound, the first filling part was attached to the acrylic resin film side, and some parts were peeled off from the core. Then, one or more samples having a size of 2 mm x 5 mm including the first filling part were cut out from the acrylic resin film. The samples were cut out from any point including the tip of the first filling part and not having dirt, fingerprints, etc. attached thereto. Then, the edge thickness T1 of the first filling part was measured under the following measurement conditions. The edge thickness T1 was obtained by measuring the edge thickness at 10 points and calculating the arithmetic average value of the thicknesses at 8 points excluding the maximum and minimum values ​​among the thicknesses measured at 10 points. (Measurement conditions) Objective lens: 10x ·Zoom: 1x ·Measurement area: 2.17mm x 2.17mm Scan Length: 5μm min mod:0.015 ·Temperature: 23℃ Relative humidity: 50%

[0325] The results are shown in Tables 1 and 2 below. [Table 1]

[0326] [Table 2]

[0327] The roll body according to Comparative Example 1 had a long deformation relaxation length at the winding start end and a long deformation relaxation length in the double-sided tape. This is believed to be because the first gap was hollow, so the step caused by the winding start end of the acrylic resin film was large, and the second gap was hollow, so the step caused by the double-sided tape was large. In contrast, the roll bodies according to Examples 1 to 11 had shorter deformation relaxation lengths at the winding start end and in the double-sided tape than the roll body according to Comparative Example 1. This is believed to be because the roll bodies according to Examples 1 to 10 had a small step caused by the winding start end of the acrylic resin film because the first filling part was filled in the first gap, and a small step caused by the double-sided tape because the second filling part was filled in the second gap or the second interposed part was interposed in the area corresponding to the second gap.

[0328] In the roll body according to Comparative Example 2, the end of the first filling part was exposed. This is considered to be due to the silicone resin composition being applied with pressure when the acrylic resin film was wound, causing the silicone resin composition to protrude outside the acrylic resin film. In contrast, the roll bodies according to Examples 1 to 8 were provided with a first exposure suppression part that suppresses the protrusion of the first filling part itself and a second exposure suppression member that suppresses the protrusion of the second filling part itself, so that the end of the first filling part and the end of the second filling part did not protrude from the film such as the acrylic resin film, and were therefore not exposed. In addition, the roll bodies according to Examples 9 and 10 were provided with a first exposure suppression part that covers the protruding end of the first filling part and a second exposure suppression member that covers the protruding end of the second filling part, so that the end of the first filling part and the end of the second filling part were not exposed. The roll body according to Example 11 was provided with a first part that covers the protruding end of the first filling part and a second part that suppresses the protrusion of the second filling part itself, so that the end of the first filling part and the end of the second filling part were not exposed.

[0329] The deformation relaxation length of the winding start end of the roll according to Example 6 was shorter than the deformation relaxation length of the winding start end of the roll according to Example 7. This is considered to be because the in-plane retardation of the PET film used in the roll according to Example 6 was smaller than the in-plane retardation of the PET film used in the roll according to Example 7.

[0330] The first filling section of the roll body of Examples 1 and 4 had a length L1 / thickness T2 or (length L1 + length L2) / thickness T2 of 90 or more, and / or an area S1 / thickness T2 or (area S1 + area S2) / thickness T2 of 3.0 or more, so the deformation relaxation length at the winding start end was shorter than that of the roll body of Example 5, in which the length L1 / thickness T2 was less than 90. [Explanation of symbols]

[0331] 10, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130...Roll body 11...Core 11A…Outer surface 12…Sheet 12A…Start of winding end 12A1…Tip surface 13…First gap 14…First filling section 15…Second gap 16…Second filling section 17, 81...Fixing members 18, 101, 121...First exposure suppression member 19, 102, 122...Second exposure suppression member 111…Second intervening part 112, 132...Exposure suppression member

Claims

1. A roll body including a core and a long sheet wound around an outer peripheral surface of the core, a first gap located between the core and the first turn of the sheet and in contact with a tip end surface of the first turn of the sheet at a winding start end in a longitudinal direction; a first filling portion that fills the first gap and extends in a width direction of the winding core; a first exposure suppression member that suppresses an end portion of the first filling portion in the width direction from being exposed outside the sheet, A roll body, wherein 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 roll body according to claim 1 , wherein the sheet has an effective area and a non-effective area located outside the effective area in the width direction, and the first exposure suppression member is located in the non-effective area of ​​the sheet.

3. The roll body according to claim 1 or 2, wherein the first exposure suppressing member extends along a circumferential direction of the winding core.

4. The roll body according to claim 1 , wherein a length of the first exposure suppressing member in a circumferential direction of the winding core is greater than a maximum length of the first filling portion in the circumferential direction.

5. A roll body comprising a core and a long sheet wound around an outer peripheral surface of the core, a first gap located between the core and the first turn of the sheet and in contact with a tip end surface of the first turn of the sheet at a winding start end in a longitudinal direction; a first filling portion that fills the first gap and extends in a width direction of the winding core; a first exposure suppression member that suppresses an end portion of the first filling portion in the width direction from being exposed outside the sheet, A roll body, in which the end of the first filling portion protrudes outside the sheet, and the first exposure suppression member is sheet-shaped and covers the protruding end of the first filling portion.

6. The roll body according to claim 1 , wherein the first filling portion contains a coloring material or a luminescent material.

7. The roll body according to claim 1 , wherein the first filling section contains a cured product of a curable polymer composition.

8. The roll body according to claim 1 , wherein the first exposure suppressing member is made of a resin or is a tape.

9. A roll body including a core and a long sheet wound around an outer peripheral surface of the core, a fixing member provided between the core and the first turn of the sheet, the fixing member having a first end surface extending in a width direction of the core and a second end surface opposite to the first end surface, and fixing a portion of the sheet to the core; a second gap located between the core and the first turn of the sheet and in contact with the first end surface of the fixing member; a second filling portion that fills the second gap and extends in a width direction of the winding core; a second exposure suppression member that suppresses an end of the second filling portion in the width direction from being exposed outside the sheet, A roll body, wherein 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.

10. The roll body according to claim 9 , wherein the sheet has an effective area and a non-effective area located outside the effective area in the width direction, and the second exposure suppression member is located in the non-effective area of ​​the sheet.

11. The roll body according to claim 9 or 10, wherein the second exposure suppressing member extends along a circumferential direction of the winding core.

12. The roll body according to claim 9 , wherein a length of the second exposure suppressing member in a circumferential direction of the winding core is greater than a maximum length of the second filling portion in the circumferential direction.

13. A roll body comprising a core and a long sheet wound around an outer peripheral surface of the core, a fixing member provided between the core and the first turn of the sheet, the fixing member having a first end surface extending in a width direction of the core and a second end surface opposite to the first end surface, and fixing a portion of the sheet to the core; a second gap located between the core and the first turn of the sheet and in contact with the first end surface of the fixing member; a second filling portion that fills the second gap and extends in a width direction of the winding core; a second exposure suppression member that suppresses an end of the second filling portion in the width direction from being exposed outside the sheet, A roll body, wherein the end of the second filling portion protrudes outside the sheet, and the second exposure suppression member is sheet-shaped and covers the protruding end of the second filling portion.

14. The roll body according to claim 9 , wherein the second filling portion contains a coloring material or a luminescent material.

15. The roll body according to claim 9 , wherein the second filling section contains a cured product of a curable polymer composition.

16. A roll body including a core and a long sheet wound around an outer peripheral surface of the core, a fixing member provided between the core and the first turn of the sheet, the fixing member having a first end face extending in a width direction of the core and a second end face located opposite to the first end face and closer to a winding start end of the first turn of the sheet in a longitudinal direction than the first end face, and fixing a portion of the sheet to the core; a second gap located between the core and the first turn of the sheet and in contact with the first end surface of the fixing member; an interposition portion provided in at least a region corresponding to the second gap between the sheets in a first turn or later and extending in a width direction of the winding core; a second exposure suppression member that suppresses an end portion of the intermediate portion in the width direction from being exposed outside the sheet; The roll body comprises:

17. The roll body according to claim 16 , wherein the second exposure suppressing member is located outside the end of the intermediate portion in the width direction, and at least a portion of the second exposure suppressing member is covered by the sheet.

18. The roll body according to claim 16 or 17, wherein the second exposure suppressing member extends along a circumferential direction of the winding core.

19. The roll body according to claim 16 , wherein a length of the second exposure suppressing member in a circumferential direction of the winding core is greater than a maximum length of the interposed portion in the circumferential direction.

20. The roll body according to claim 16 , wherein the interposed portion contains a coloring material or a luminescent material.

21. The roll body according to claim 16 , wherein the intermediate portion comprises a cured product of a curable polymer composition.

22. The roll body according to claim 1 , wherein the sheet is a resin film, paper, or a glass film.

23. 22. The roll body according to claim 1, wherein the sheet comprises an acrylic resin, a polyester resin, or a cycloolefin polymer resin.

24. 24. The roll body according to claim 1, wherein the sheet has a thickness of 15 μm or more and 300 μm or less.

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