Web roll manufacturing method, web roll wrinkle suppression method, and web roll

Abstract

To provide a manufacturing method of a web roll in which paper tube crush, wrinkles, winding deviation and paper tube slip-out do not occur, a wrinkle suppression method of a web roll, and a web roll.SOLUTION: In a manufacturing method of a web roll 1, long webs 11 and 12 are wound up around a paper tube 10. The manufacturing method of the web roll 1 includes: a conveyance step of conveying the webs 11 and 12 in which a circumferential direction linear expansion coefficient is 0.5×10-5 to 2.0×10-5[ / K], and a radial direction linear expansion coefficient is 0.5×10-4 to 3.0×10-4[ / K]; and a winding up step of winding up the webs 11 and 12 while rotating the paper tube 10, in which moisture content is 1 to 3%, in the circumferential direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing a web roll, a method for suppressing wrinkles in a web roll, and a web roll. [Background technology]

[0002] A long medium such as a resin film called a web is usually made into a web roll (also called a take-up roll, web roll body, etc.) by winding the web transported on a line around a core (also called a winding core, etc.) and stored in this state. A cardboard tube or the like is used as the core.

[0003] As a method for manufacturing such a web roll, for example, Patent Document 1 discloses a technology for manufacturing a rolled product of heat shrinkable film by winding a heat shrinkable film around a paper tube in which the friction coefficient μ between the paper tube surfaces is 0.3 or more and the moisture content (A) is 8.0% or less after drying at 105°C for 20 hours and then leaving it for 168 hours in an environment of 20°C and relative humidity 65%, while maintaining the controlled moisture content of the paper tube at 8.5% or less. Furthermore, paragraph 0018 of Patent Document 1 discloses that the moisture content of the paper tube is preferably 5.0 to 8.5%, and that if the moisture content is less than 5.0%, the strength of the paper tube will be insufficient and the paper on the surface will be easily peeled off. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-008411 A Summary of the Invention [Problem to be solved by the invention]

[0005] The above-mentioned web is given added value as various products such as packaging materials, adhesive labels, and electronic components by, for example, performing various processes, coatings, printing, etc. Then, as the final step, a winding process is performed to make the web roll, which is then stored and transported. Therefore, the occurrence of "paper tube crushing" or "wrinkling" immediately after winding the web roll, during storage, transport, etc., is a defect that causes damage to commercial value, the occurrence of defective products, a decrease in yield, etc. Paper tube crushing and wrinkling are likely to occur due to compression of the web, particularly in the inner diameter area (winding core portion) close to the paper tube.

[0006] In this regard, the technology described in Patent Document 1 attempts to take measures against the phenomenon in which the wound film shifts like an extendable telescope (winding shift) and the phenomenon in which the paper tube comes off from the rolled film product (paper tube coming off), but does not take into consideration the above-mentioned paper tube crushing and wrinkling. After the present inventors thoroughly studied this point, they found that the conventional technology such as Patent Document 1 does not sufficiently prevent the occurrence of paper tube crushing and wrinkling, and there is room for improvement.

[0007] Furthermore, a manufacturing method that can sufficiently suppress all of the paper tube crushing, wrinkles, winding deviation, and paper tube slippage has not yet been realized. For example, when the winding conditions are controlled in an attempt to suppress the occurrence of the paper tube crushing and wrinkles, the winding deviation and paper tube slippage may occur. Alternatively, when the winding conditions are controlled in an attempt to suppress the occurrence of the winding deviation and paper tube slippage, the paper tube crushing and wrinkles may occur. In this way, the paper tube crushing, wrinkles, winding deviation, and paper tube slippage tend to fall into a trade-off relationship.

[0008] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a method for manufacturing a web roll that does not cause paper tube crushing, wrinkles, winding misalignment, or paper tube slippage, a method for suppressing wrinkles in a web roll, and a web roll. [Means for solving the problem]

[0009] As a result of intensive research conducted by the present inventors in order to achieve the above-mentioned object, it has been discovered that a method for manufacturing a web roll in which a long web is wound around a paper tube is provided, the method comprising the steps of: -5 ~2.0×10 -5 [ / K] and the radial linear expansion coefficient is 0.5×10 -4 ~3.0×10 -4 The present invention was thus completed based on the discovery that the method for manufacturing a web roll includes a transporting step of transporting a web having a moisture content of 1 to 3% and a winding step of winding the web in the circumferential direction of a rotating paper tube having a moisture content of 1 to 3%.

[0010] That is, the present invention is as follows.

[0011] (1) A method for manufacturing a web roll in which a long web is wound around a paper tube, the method comprising the steps of: -5 ~2.0×10 -5 [ / K] and the radial linear expansion coefficient is 0.5×10 -4 ~3.0×10 -4 and a winding step of winding the web in the circumferential direction of the paper tube, which has a moisture content of 1 to 3%, while rotating the paper tube. (2) The method for producing a web roll according to (1), wherein the web contains at least one selected from the group consisting of polyester-based resins, polyolefin-based resins, polyimide-based resins, polyurethane-based resins, and polycarbonate-based resins. (3) The method for producing a web roll according to (1) or (2), wherein the thickness of the web is 30 to 200 μm. (4) The method for producing a web roll according to any one of (1) to (3), wherein the paper tube is a seamless paper tube. (5) The method for producing a web roll according to any one of (1) to (4), wherein the cardboard core has a thickness of 1 to 15 mm. (6) The method for manufacturing a web roll according to any one of (1) to (5), further comprising a cutting step of cutting the web transported in the transport step in the width direction to obtain the web wound around the paper tube as the web roll. (7) The method for producing a web roll according to any one of (1) to (6), wherein in the winding step, the web is cut while controlling the winding tension of the web to be in the range of 5 to 25 kg. (8) A method for suppressing wrinkles in a web roll in which a long web is wound around a paper tube, the method comprising the steps of: -5 ~2.0×10 -5 [ / K] and the radial linear expansion coefficient is 0.5×10 -4 ~3.0×10 -4 The method for suppressing wrinkles in a web roll includes a winding step of winding the web having a moisture content of 1 to 3% in a circumferential direction while rotating the paper tube having a moisture content of 1 to 3%. (9) A web roll in which a long web is wound around a paper tube, the paper tube having a moisture content of 1 to 3%, and a circumferential linear expansion coefficient of 0.5×10 -5 ~2.0×10 -5 [ / K] and the radial linear expansion coefficient is 0.5×10 -4 ~3.0×10 -4 [ / K] and a web roll including the web. Effect of the Invention

[0012] According to the present invention, it is possible to provide a method for manufacturing a web roll in which collapse of the paper tube, wrinkles, winding deviation, and paper tube coming-off do not occur, a method for suppressing wrinkles in a web roll, and a web roll. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram for explaining the manufacturing method of this embodiment. [Diagram 2]FIG. 2 is a schematic diagram for explaining a state in which the web is buckled during winding. [Diagram 3] FIG. 3 is a schematic diagram for explaining a winding state in this embodiment. [Figure 4] FIG. 4 is a schematic cross-sectional view showing an example of the web of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment for carrying out the present invention (hereinafter, simply referred to as "the present embodiment") will be described in detail. The present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be carried out by appropriately modifying it within the scope of its gist.

[0015] In the drawings, the same elements are given the same reference numerals, and duplicated explanations are omitted. Furthermore, unless otherwise specified, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to the ratios shown in the drawings.

[0016] <Web Roll Manufacturing Method>

[0017] FIG. 1 is a schematic diagram for explaining the manufacturing method of this embodiment, FIG. 2 is a schematic diagram for explaining the state in which the web is buckled during winding, FIG. 3 is a schematic diagram for explaining the winding state in this embodiment, and FIG. 4 is a schematic cross-sectional view showing an example of a web of this embodiment.

[0018] The method for manufacturing the web roll 1 of the present embodiment is a method for manufacturing the web roll 1 in which a long web 11 is wound around a paper tube 10, and the web roll 1 has a circumferential linear expansion coefficient of 0.5×10 -5 ~2.0×10 -5 [ / K] and the radial linear expansion coefficient is 0.5×10 -4 ~3.0×10 -4and a winding process for winding the webs 11, 12 in the circumferential direction of a rotating paper tube 10 having a moisture content of 1 to 3%.

[0019] The web 11 is usually long and has a generally rectangular shape, and may be called a sheet, a film, etc. In this specification, the web 11 before being wound up may be called a "transport web 12," and the transport web 12 and the web 11 may be collectively called "webs 11, 12."

[0020] According to this embodiment, by winding the webs 11 and 12, whose circumferential linear expansion coefficient and radial linear expansion coefficient are within a specific range, onto a paper tube 10 having a moisture content within a specific range, it is possible to suppress the occurrence of paper tube crushing, wrinkles, winding misalignment, and paper tube slippage of the web roll 1.

[0021] (Transportation process)

[0022] The transport web 12 is transported on the line in the flow direction (see arrow F) by a transport device. Although not shown, the line may be appropriately provided with a transport device, guide rollers, nip rollers, embossing rollers, various detection devices for monitoring the surface state and physical properties of the transport web 12, and the like. The transport conditions for the transport web 12 are not particularly limited, and may be determined taking into consideration the dimensions, shapes, and configurations of the webs 11 and 12.

[0023] The roll length of the transport web 12 is not particularly limited, but is preferably, for example, 200 to 600 m, more preferably 300 to 500 m, and even more preferably 350 to 450 m. The transport speed of the transport web 12 is not particularly limited, but is preferably, for example, 1 to 150 m / min, more preferably 10 to 120 m / min, and even more preferably 20 to 100 m / min.

[0024] The material of the webs 11 and 12 is not particularly limited, but is usually a resin. Specifically, the webs 11 and 12 preferably contain at least one selected from the group consisting of polyester-based resin, polyolefin-based resin, polyimide-based resin, polyurethane-based resin, and polycarbonate-based resin.

[0025] Examples of polyester resins include polyethylene terephthalate (PET) resin, polyethylene naphthalate (PEN) resin, etc. Examples of polyolefin resins include polyethylene resins such as high-density polyethylene, low-density polyethylene, linear low-density polyethylene, etc.; polypropylene resins such as oriented polypropylene, non-oriented polypropylene, etc.

[0026] The webs 11 and 12 may be a single layer or may be composed of two or more layers. It can be appropriately determined depending on the application. For example, when the webs 11 and 12 are used as materials for a release film, a tack film, etc., they may have a three-layer structure including a base layer 111, an adhesive layer 112, and a release material layer 113, as shown in FIG. 4.

[0027] In this case, examples of the material for the base layer 111 include polyester resins, polyolefin resins, polyimide resins, and polyurethane resins.

[0028] Examples of materials for the adhesive layer 112 include acrylic resins, epoxy resins, silicone resins, rubber resins, and polyester resins.

[0029] Examples of the release material of the release material layer 113 include polyester resins, polyolefin resins, polyimide resins, and polyurethane resins. In addition, the release material may be a release sheet that has been subjected to a double-sided release treatment or a release sheet that has been subjected to a single-sided release treatment, and may be, for example, a base material for the release material coated with a release agent. Examples of the base material for the release material include the above-mentioned base materials used as the base material layer 111. Examples of the release agent include rubber-based elastomers such as silicone-based resins, olefin-based resins, isoprene-based resins, and butadiene-based resins, long-chain alkyl-based resins, alkyd-based resins, and fluorine-based resins.

[0030] Furthermore, according to this embodiment, in addition to the base layer 111, the adhesive layer 112, and the release material layer 113, other functional layers (for example, a print layer, a barrier layer, a coat layer, etc.) may be provided.

[0031] The circumferential linear expansion coefficient of the web 11 is 0.5×10 -5 ~2.0×10 -5 [ / K], which is 0.8 × 10 -5 ~1.8×10 -5 [ / K], preferably 1.0×10 -5 ~1.6×10 -5 It is more preferable that the radial linear expansion coefficient of the web 11 is 0.5×10 -4 ~3.0×10 -4 [ / K], which is 0.8 × 10 -4 ~2.8×10 -4 [ / K], preferably 1.0×10 -4 ~2.6×10 -4 [ / K] is more preferable.

[0032] The circumferential linear expansion coefficient is the linear expansion coefficient in the circumferential direction (see symbol C in FIG. 1) when the web 11 is wound up. The radial linear expansion coefficient is the linear expansion coefficient in the radial direction (see symbol R) when the web 11 is wound up. The linear expansion coefficient indicates the rate at which the web 11 expands due to an external temperature rise, and can be used as an index of thermal expansion. The circumferential linear expansion coefficient and the radial linear expansion coefficient can be measured by the method described in the examples below.

[0033] The thickness of the webs 11, 12 is not particularly limited, but is preferably 10 to 500 μm, more preferably 20 to 300 μm, even more preferably 30 to 200 μm, and even more preferably 40 to 100 μm. By setting the thickness of the webs 11, 12 within the above range, winding in a roll shape becomes easier, and handling properties in the case of roll-to-roll processing are further improved.

[0034] (Winding process)

[0035] In the winding process, the transport web 12 is wound around a paper tube 10 having a moisture content of 1 to 3%.

[0036] In the conventional winding process as disclosed in Patent Document 1 and the like, it was believed that a paper tube with a relatively high moisture content of 5.0% or more was preferable, and that a low moisture content was undesirable because the paper tube would lack strength and the surface paper would be prone to peeling. However, the present inventors changed their thinking and unexpectedly discovered that when winding webs 11 and 12 with linear expansion coefficients in the above-mentioned ranges, if a paper tube 10 (dried paper tube) with a low moisture content of 1 to 3% is used, the occurrence of paper tube crushing, wrinkles, winding misalignment, and paper tube slippage can be suppressed.

[0037] For example, as shown in Fig. 1, in the winding process, a paper tube 10, which is a winding core, is used as a drive shaft and rotated in the circumferential direction (see symbol C) to wind up a transport web 12. At that time, as shown in Fig. 2, circumferential stress (see arrows f1, f2) and radial stress (see arrows f3, f4) are generated in the roll being wound, and it is believed that the action of these stresses causes the paper tube to collapse and wrinkle.

[0038] For example, one of the causes of the cardboard tube crushing is thought to be that the radial stress increases from the outermost surface of the web 11 of the web roll 1 toward the cardboard tube 10 (arrow f3>arrow f4). Also, one of the causes of the occurrence of wrinkles is thought to be that the web 11 buckles (folds) when the circumferential stress acts in the compression direction (arrows f1, f2) (see arrows f5, f6 in area A).

[0039] Furthermore, when the temperature and / or humidity of the place where the web roll 1 is stored is high, the internal stress in the radial direction further increases due to the expansion of the web 11 and the cardboard tube 10. In this manner, the risk of cardboard tube crushing and wrinkles may increase depending on the temperature and humidity in the storage environment of the web roll 1.

[0040] In this regard, it is generally conceivable to try to eliminate such a problem by reducing the internal stress by lowering the winding tension, but other problems such as winding slippage and paper tube slippage may occur, and there are cases in which it is not possible to change the winding conditions. On the other hand, in this embodiment, by deliberately using a paper tube 10 with a low moisture content, such a problem can be solved without significantly lowering the winding tension.

[0041] The present inventors considered the behavior of the paper tube 10 and the web 11, and thought that the humidity factor is more important for the paper tube 10, and the temperature factor is more important for the web 11. They thought that the occurrence of paper tube collapse and wrinkles could be suppressed by controlling the moisture content of the paper tube 10 and the thermal expansion of the web 11 as follows. First, when the moisture content of the paper tube 10 is high, the expansion coefficient of the web 11 becomes larger than the humidity expansion of the paper tube 10. As a result, the web 11 buckles in the gap between the paper tube 10 and the web 11, and the paper tube collapses and wrinkles occur. On the other hand, when the moisture content of the paper tube 10 is low, the thermal expansion of the web 11 becomes larger than the humidity expansion of the paper tube 10. As a result, the web 11 expands along the paper tube 10, and no gap is created between the two, so the paper tube collapses and wrinkles do not occur. Based on this idea, they focused on the circumferential linear expansion coefficient and the radial linear expansion coefficient as indicators of the thermal expansion of the web 11.

[0042] As a result of intensive research based on this focus, the present inventors have found that the circumferential linear expansion coefficient is 0.5×10 -5 ~2.0×10 -5 [ / K] and the radial linear expansion coefficient is 0.5×10 -4 ~3.0×10 -4 It has been found that by combining the webs 11, 12 having a moisture content of [ / K] and winding them around a paper tube 10 having a moisture content of 1 to 3%, it is possible to suppress the occurrence of collapse of the paper tube and wrinkles.

[0043] In addition, the paper tube 10 with a low moisture content (dry paper tube) is considered to expand more due to the external humidity, and therefore the internal stress increases. However, -5 ~2.0×10 -5 [ / K] and the radial linear expansion coefficient is 0.5×10 -4 ~3.0×10 -4By using the webs 11 and 12, which are [ / K], the thermal expansion of the webs 11 and 12 can be controlled, and by using such a web 11, the internal stress in the circumferential direction can be dispersed (for example, see arrows f7 and f8 in Fig. 3), and the internal stress in the radial direction can be suppressed to a moderate level (for example, see arrows f9 and f10 in Fig. 3). As a result, it is believed that even if there is a cause of expansion due to external temperature or humidity, it is possible to suppress the occurrence of collapse of the paper core and wrinkles.

[0044] Furthermore, if the winding conditions are changed to suppress the occurrence of paper tube crushing and wrinkles, other problems such as winding misalignment and paper tube slippage will occur, so there is a restriction that the winding conditions cannot be changed. However, in this embodiment, since it is only necessary to control the circumferential linear expansion coefficient and radial linear expansion coefficient, which are physical properties of the web 11, and the moisture content, which is a physical property of the paper tube 10, there is also an advantage that the occurrence of all of the paper tube crushing, wrinkles, winding misalignment, and paper tube slippage can be suppressed without significantly changing the winding conditions (however, the action of this embodiment is not limited to these).

[0045] In addition, the moisture percentage based on the bone dry method can be used as the moisture percentage of the paper tube 10, but for example, it can be calculated by converting the moisture percentage based on the infrared absorption method into a calibration curve showing the correlation between the moisture percentage based on the bone dry method and the moisture percentage based on the infrared absorption method. Specifically, it can be calculated by the method described in the examples below.

[0046] A spiral paper tube, a flat-wound paper tube, a seamless paper tube, etc. can be used as the paper tube 10. Among these, a seamless paper tube is preferable from the viewpoint that the grooves of the paper tube 10 do not leave marks on the web 11 due to the pressure of tightening the winding.

[0047] The inner diameter of the cardboard tube 10 is, for example, preferably 40 to 100 mm, more preferably 60 to 90 mm, and even more preferably 70 to 80 mm. The thickness (wall thickness) of the cardboard tube 10 is preferably 1 to 15 mm, more preferably 2 to 10 mm, and even more preferably 3 to 8 mm. As the cardboard tube 10, for example, a 2-inch cardboard tube, a 3-inch cardboard tube, etc. can be used.

[0048] The cardboard tube 10 is made by winding a cardboard tube base paper around the outer circumferential surface of a hollow cylindrical shaft or the like using a spiral machine or the like, and then cut to a product length. If necessary, steps on the surface of the cardboard tube 10 may be smoothed. Since the cardboard tube 10 of this embodiment is a dry paper tube with a low moisture content, it is dried at high temperatures for several days. For example, it is preferable to dry it at 50 to 80°C for 2 to 3 days.

[0049] It is believed that the collapse of the cardboard tube is caused by an increase in radial stress from the outermost surface of the web 11 of the web roll 1 toward the cardboard tube 10 (arrow f3>arrow f4). For example, when the winding tension of the web 11 increases or when the touch pressure by the touch roller 2 described below increases, the stress in the direction from the outermost surface of the web 11 toward the cardboard tube 10 increases, and cardboard tube collapse tends to occur more easily.

[0050] Furthermore, it is believed that wrinkles occur when the web 11 buckles (folds) when the circumferential stress acts in the compression direction (arrows f1, f2) (see arrows f5, f6 in region A). For example, when the winding tension of the web 11 increases or when the touch pressure of the touch roller 2 described below increases, the circumferential stress acts in the compression direction, and wrinkles tend to occur more easily.

[0051] From this viewpoint, it is preferable that the winding conditions satisfy the following conditions.

[0052] The winding tension of the webs 11, 12 is preferably controlled to be in the range of 5 to 25 kg, more preferably in the range of 10 to 20 kg, and even more preferably in the range of 13 to 18 kg. As described below, when the winding tension is controlled so as to gradually decrease from the start of winding to the end of winding, it is preferable that both the winding tension at the start of winding and the winding tension at the end of winding are in the above range.

[0053] It is preferable to control the winding tension of the webs 11, 12 so that it gradually decreases from the start of winding to the end of winding. By gradually decreasing the winding tension in such a manner as to apply a taper, it is possible to control the winding tension so that it follows the increase in the winding diameter.

[0054] The winding tension of the webs 11, 12 is preferably controlled so that the ratio of the final value at the end of winding to the initial value at the start of winding is preferably 80 to 10%, more preferably 70 to 20%, and even more preferably 60 to 30%. This can further reduce the risk of winding slippage.

[0055] It is preferable to wind up the webs 11, 12 while pressing them against the cardboard tube 10 with the touch roller 2. In particular, by bringing the touch roller 2 into contact with the web 12 and pressing it, it is possible to control the entrainment of surrounding air (see the symbol Air in FIG. 1) that affects the internal stress of the web roll 1. It is preferable to control the touch pressure of the touch roller 2 on the webs 11, 12 to be preferably in the range of 5 to 35 kg, more preferably in the range of 10 to 30 kg, and even more preferably in the range of 15 to 25 kg. As will be described later, when controlling the touch pressure to gradually decrease from the start of winding to the end of winding, it is preferable that both the touch pressure at the start of winding and the touch pressure at the end of winding are in the above range.

[0056] It is preferable to control the touch pressure of the webs 11, 12 so that it gradually decreases from the start of winding to the end of winding. By gradually decreasing the winding tension in such a manner as to apply a taper, it is possible to control the touch pressure so as to follow the increase in the winding diameter.

[0057] (Cutting process)

[0058] Next, the webs 11, 12 being transported in the transport process are cut in the width direction by the cutting unit 3, thereby obtaining the web 11 wound around the paper tube 10 as the web roll 1. The cutting unit 3 can use, for example, a shear cut, score cut, or razor cut method. The width direction is the direction perpendicular to the flow direction (arrow F) and is the short side direction of the web 11.

[0059] <How to prevent wrinkles>

[0060] According to the present embodiment, there is provided a method for suppressing wrinkles in a web roll 1 in which long webs 11 and 12 are wound around a paper tube 10, and the method further comprises the steps of: -5 ~2.0×10 -5 [ / K] and the radial linear expansion coefficient is 0.5×10 -4 ~3.0×10 -4 The method for suppressing wrinkles in a web roll 1 can include a winding step of winding up the webs 11, 12 having a moisture content of 1 to 3% in the circumferential direction while rotating a paper tube 10 having a moisture content of 1 to 3%. The webs 11, 12, the paper tube 10 and other configurations and conditions of the method for suppressing wrinkles can be the same as those described in the manufacturing method.

[0061] <Web Role>

[0062] As described above, according to the manufacturing method of this embodiment, the web roll 1 can be manufactured without the occurrence of cardboard tube crushing, wrinkles, winding misalignment, and cardboard tube slippage. The web roll 1 of this embodiment obtained in this manner is a web roll 1 in which long webs 11, 12 are wound around a cardboard tube 10, and the cardboard tube 10 has a moisture content of 1 to 3%, and the cardboard tube 10 has a circumferential linear expansion coefficient of 0.5×10 -5 ~2.0×10 -5 [ / K] and the radial linear expansion coefficient is 0.5×10 -4 ~3.0×10 -4 [ / K]. Such a web roll 1 can be suitably used as a product free from cardboard core crushing, wrinkles, winding misalignment, and cardboard core coming-off.

[0063] Such a web roll 1 is suitable for use as an adhesive product such as a surface protection film, a window film, or a marking film. EXAMPLES

[0064] The present invention will be described in more detail with reference to the following examples and comparative examples, but the present invention is not limited to the following examples. Note that units are based on mass unless otherwise specified.

[0065] <Example 1>

[0066] The web 11 was made of polyethylene terephthalate (PET) (manufactured by Lintec Corporation, product name "Fuji Clear 25A PL Thin PET38", thickness 75 μm, width 240 mm, length (roll length) 400 m), and the paper tube 10 was made of seamless paper tube (manufactured by Tanaka Paper Tube Co., Ltd., inner diameter 76.7 mm, thickness (wall thickness) 6 mm, moisture content 1.0%). Before being wound up, the web 11 was stored for 24 hours under conditions of 40° C. and 70% RH, and then the conveying step, winding step, and cutting step were carried out under the following conditions using an apparatus having the configuration shown in FIG. Circumferential linear expansion coefficient of web 11: 1.5×10 -5[ / K] Radial linear expansion coefficient of web 11: 2.0×10 -4 [ / K] Web 11 conveying speed: 80 m / min Winding tension at the start of winding: 15 kg, Winding tension at the end of winding: 11 kg, Ratio of winding tension at the end of winding to that at the start of winding: 70%, taper slope. Touch pressure: 20kg, Touch pressure when starting winding: 20kg

[0067] The linear expansion coefficients of the web 11 in the circumferential direction and the radial direction were measured using a thermomechanical analyzer (TMA 4000S, manufactured by NETZSCH Japan). That is, in accordance with JIS K 7197:2012 ("Testing method for linear expansion coefficient of plastics by thermomechanical analysis"), the thermal strain with respect to temperature was obtained, and the linear expansion coefficient was calculated from the slope. The test piece for measuring the circumferential direction was 20 mm long and 5 mm wide, and was measured at a heating rate of 5°C / min. The test piece for measuring the radial direction was 8 mm long, 8 mm wide, and 1 mm thick, and was measured at a heating rate of 1°C / min.

[0068] The moisture content of the paper tube 10 was determined by creating a calibration curve showing the correlation between the moisture content based on the bone dry method and the moisture content based on the infrared absorption method, and inserting the moisture content measured using an IR moisture meter (IR-AM200, manufactured by Chino Corporation) into the calibration curve.

[0069] Specifically, the measurements were carried out by the following method. First, the surface of the cardboard tube 10 was cut out to prepare a sample (standard sample), and the moisture content based on the bone-drying method and the moisture content measured by an infrared absorption method using an IR moisture content meter were obtained for the sample. Then, a calibration curve (conversion formula) showing the correlation between the two was created. The moisture content based on the bone-drying method was calculated based on the following formula (1) by placing the sample in a dryer under conditions of bone-drying temperature of 100°C and bone-drying time of 2 hours to make it bone-dry. Moisture content based on the dry method [%] = (W1-W2) / W1 × 100 (1) W1: Mass before drying W2: Mass after drying Next, the surface of the paper tube 10 of Example 1, which is the measurement target, was measured by an IR moisture content meter. The obtained measurement value of the IR moisture content meter was inserted into a calibration curve to determine the moisture content (%) based on the bone dry method. The above measurements were carried out at five points on the surface of the cardboard tube 10, and the arithmetic mean value of these measurements was taken as the moisture content of the cardboard tube 10.

[0070] <Example 2>

[0071] The conveying step, winding step, and cutting step were carried out under the same conditions as in Example 1, except that a paper tube 10 with a moisture content of 3.0% was used, to produce a web roll 1.

[0072] <Comparative Example 1>

[0073] A web roll was produced by carrying out the conveying step, winding step, and cutting step under the same conditions as in Example 1, except that a paper tube with a moisture content of 4.8% was used.

[0074] <Comparative Example 2>

[0075] A web roll was produced by carrying out the conveying step, winding step, and cutting step under the same conditions as in Example 1, except that a paper tube with a moisture content of 10.5% was used.

[0076] <Whether or not the paper tube is crushed>

[0077] After winding was completed, the web roll was visually inspected for crushing of the paper core. Specifically, when deformation or breakage was visually confirmed in the cardboard tube, it was determined that the cardboard tube had been crushed.

[0078] <Whether or not wrinkles occur>

[0079] After winding was completed, the web roll was visually inspected for the presence or absence of wrinkles. Specifically, if wrinkles of 5 cm or more were visually confirmed, it was determined that wrinkles had occurred.

[0080] <Whether or not there is misalignment>

[0081] After winding was completed, the web roll was visually inspected for the presence or absence of winding misalignment. Specifically, if the appearance of the web roll at the end of winding was visually observed and web misalignment was confirmed, or if web misalignment occurred when the web roll was lifted up, it was determined that winding misalignment had occurred.

[0082] <Whether or not the paper tube is missing>

[0083] After winding was completed, the web roll was visually inspected for the presence or absence of paper tube detachment. Specifically, when the paper tube of the web roll was grasped at the end of winding and lifted in the axial direction (e.g., upward), if only the paper tube was lifted from the web roll, or if the paper tube came out, it was determined that the paper tube had come out.

[0084] The evaluation results of each of the examples and comparative examples are shown in Table 1.

[0085] [Table 1]

[0086] From the above, it was confirmed that, according to this embodiment, at least, the paper tube crush, wrinkles, winding misalignment, and paper tube slippage did not occur. [Explanation of symbols]

[0087] 1: Web Roll 2: Touch roller 3: Cutting section 10:Paper tube 11: Web 12: Transport web 111: Base material layer 112: Adhesive layer 113: Release layer C:Jenzhou direction R: Radius direction F,f1,f2,f3,f4,f5,f6,f7,f8,f9,f10: vector seal

Claims

1. A method for manufacturing a web roll in which a long web is wound around a paper tube, comprising the steps of: The circumferential linear expansion coefficient is 0.5 x 10 －５ ~2.0 x 10 －５ [ / K] and the radial linear expansion coefficient is 0.5×10 －４ ~3.0 x 10 －４ a conveying step of conveying the web, a winding step of winding the web in a circumferential direction around the paper tube having a moisture content of 1 to 3% while rotating the paper tube; Including, In the winding step, the winding tension of the web at the start of winding is in the range of 13 to 18 kg, and the winding tension is controlled so as to gradually decrease from the start of winding to the end of winding such that the ratio of the final value of the winding tension at the end of winding to the initial value at the start of winding is 80 to 10%.

2. The web contains at least one selected from the group consisting of polyester-based resins, polyolefin-based resins, polyimide-based resins, polyurethane-based resins, and polycarbonate-based resins. The method for producing the web roll of claim 1 .

3. The thickness of the web is 30 to 200 μm. The method for producing the web roll according to claim 1 or 2.

4. The paper tube is a seamless paper tube. The method for producing the web roll according to any one of claims 1 to 3.

5. The thickness of the cardboard tube is 1 to 15 mm. The method for producing the web roll according to any one of claims 1 to 4.

6. The method further includes a cutting step of cutting the web transported in the transport step in a width direction to obtain the web wound around the paper tube as the web roll. The method for producing the web roll according to any one of claims 1 to 5.

7. A method for suppressing wrinkles in a web roll in which a long web is wound around a paper tube, comprising the steps of: The circumferential linear expansion coefficient is 0.5 x 10 －５ ~2.0 x 10 －５ [ / K] and the radial linear expansion coefficient is 0.5×10 －４ ~3.0 x 10 －４ a winding step of winding the web having a moisture content of 1 to 3% in a circumferential direction while rotating the paper tube having a moisture content of 1 to 3%, In the winding step, the winding tension of the web at the start of winding is in the range of 13 to 18 kg, and the winding tension is controlled so as to gradually decrease from the start of winding to the end of winding such that the ratio of the final value of the winding tension at the end of winding to the initial value at the start of winding is 80 to 10%.

8. A web roll in which a long web is wound around a paper tube, The paper tube has a moisture content of 1 to 3%; The web was wound around the paper tube under controlled conditions such that the winding tension of the web at the start of winding was in the range of 13 to 18 kg, and the winding tension was gradually decreased from the start of winding to the end of winding so that the ratio of the final value of the winding tension at the end of winding to the initial value at the start of winding was 80 to 10%. －５ ~2.0 x 10 －５ [ / K], and the radial linear expansion coefficient is 0.5×10-4 to 3.0×10 －４ [ / K] and A web role that contains

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