WO2021006314A1

WO2021006314A1 - Manufacturing method for roll body, and roll body

Info

Publication number: WO2021006314A1
Application number: PCT/JP2020/026863
Authority: WO
Inventors: 将宏鳥本; 恵大石; 亮秋山; 遼中澤; 博大馬橋; 章谷口; 橋本　浩二; 隆介長町; 雅允中野; 勇二大原
Original assignee: 大日本印刷株式会社
Priority date: 2019-07-09
Filing date: 2020-07-09
Publication date: 2021-01-14
Also published as: TW202108488A; KR20220029738A; JP2021107286A; CN114223081A

Abstract

Provided are: a manufacturing method for a roll body, said method making it possible to effectively reduce a level difference caused at a winding start end of a sheet; and such a roll body. One aspect of the present invention provides a manufacturing method for a roll body 10 including a winding core 11 and an elongate sheet 12 that is wound around an outer circumferential surface 11A of the winding core 11, said method including: a step for applying a coating material 18 onto the outer circumferential surface 11A of the winding core 11 along a width direction DR1 of the winding core 11; a step for placing, on the outer circumferential surface 11A, a winding start end 12A in a longitudinal direction DR2 of the sheet 12; and a step for winding the sheet 12 around the winding core 11 and filling at least a first gap 13 with the coating material 18. The application of the coating material 18 or the placement of the winding start end 12A is performed such that the coating material 18 comes into contact with or close to a distal end surface 12A1 located in the longitudinal direction DR2 of the winding start end 12A, and the first gap 13 is located between the winding core 11 and the first winding of the sheet 12 and is in contact with the distal end surface 12A1.

Description

Roll body manufacturing method and roll body

Reference of related application

The present application enjoys the priority benefits of the preceding Japanese applications, Japanese Patent Application No. 2019-127551 (Filing Date: July 9, 2019) and Japanese Patent Application No. 2020-7594 (Filing Date: January 21, 2020). And the entire disclosure is hereby incorporated by reference.

The present invention relates to a method for producing a roll body and a roll body.

From the viewpoint of manufacturing efficiency, sheets such as films are often manufactured in bulk in a certain amount, wound around a core, and stored as a roll. In such a roll body, a step is generated due to the winding start end portion of the sheet. Specifically, a step is generated when the seat on the first lap moves to the second lap, and the step appears on the second and subsequent laps as well. Depending on the type of sheet, if this step occurs, the sheet will be deformed and may not be restored.

Currently, a technique for alleviating the above-mentioned step by attaching or embedding a cushion tape having a high cushioning property such as urethane resin on the outer peripheral surface of the winding core and embedding a sheet in the cushion tape (see, for example, Patent Document 1). Alternatively, a technique for alleviating a step by embedding a sheet in the rubber using a winding core having rubber on the outer peripheral surface, or a cushioning having elasticity on the outer peripheral surface of the winding core along the tip of the winding start end of the sheet. A technique for providing a material has been proposed (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2005-75521 Japanese Unexamined Patent Publication No. 2013-199355

However, the current situation is that any of the above technologies cannot effectively alleviate the step.

Further, when winding the sheet around the winding core, first, a fixing member such as double-sided tape is attached to the outer peripheral surface of the winding core to fix a part of the sheet (for example, the winding start end). A step may be generated due to this fixing member.

The present invention has been made to solve the above problems. That is, it is an object of the present invention to provide a method for manufacturing a roll body capable of effectively alleviating a step caused by a winding start end portion of a sheet and such a roll body. Another object of the present invention is to provide a method for manufacturing a roll body capable of effectively reducing a step caused by a fixing member and such a roll body.

The present invention includes the following inventions.
[1] A method for manufacturing a roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core, wherein the outer circumference of the winding core is along the width direction of the winding core. A step of applying the coating material to the surface, a step of arranging the winding start end portion of the sheet in the longitudinal direction on the outer peripheral surface, and a step of winding the sheet around the winding core to apply the coating material to at least the first gap. The step of filling is provided, and the coating of the coating material or the arrangement of the winding start end portion is performed so that the coating material is in contact with or close to the tip surface of the winding start end portion located in the longitudinal direction. The manufacturing method, wherein the first gap is a gap located between the winding core and the sheet on the first round and in contact with the tip surface.

[2] A method for manufacturing a roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core, wherein the winding start end portion of the sheet in the longitudinal direction is set on the outer peripheral surface. The step of arranging the sheet, the step of winding the sheet around the winding core at least once to obtain an intermediate roll body having a first gap, and the step of winding the sheet on the surface of the sheet constituting the outer peripheral surface of the intermediate roll body. A step of applying the coating material along the width direction of the core and a step of winding the sheet around the winding core again after applying the coating material and interposing the coating material between the sheets are provided. The first gap is a gap located between the winding core and the sheet on the first circumference and is in contact with the tip surface located at the winding start end in the longitudinal direction, and the coating material is the coating material. A manufacturing method, which is applied to a first region corresponding to the first gap on the surface of the sheet constituting the outer peripheral surface of the intermediate roll body.

[3] A method for manufacturing a roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core, wherein the outer circumference of the winding core is along the width direction of the winding core. A fixing member having a first end surface extending in the width direction of the winding core and a second end surface opposite to the first end surface is arranged on the surface for fixing a part of the sheet to the winding core. A step of applying a coating material to the outer peripheral surface of the winding core along the width direction of the winding core, and a step of fixing a part of the sheet to the winding core via the fixing member. After applying the coating material and fixing a part of the sheet to the winding core, the sheet is wound around the winding core to fill at least one of the second gap and the third gap with the coating material. In the coating of the coating material or the arrangement of the fixing member, the coating material is located on the first end surface side or the second end surface side, and the coating material is the first end surface or the said. The coating material is placed in contact with or close to the second end face, or the coating material is located on the first end face side and the second end face side, respectively, and the coating material is in contact with or in close contact with the first end face and the second end face. The second gap is a gap between the core and the sheet on the first lap and is in contact with the first end surface, and the third gap is the winding. A manufacturing method, which is a gap located between the core and the sheet on the first round and in contact with the second end surface.

[4] A method for manufacturing a roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core, wherein the outer circumference of the winding core is along the width direction of the winding core. A fixing member having a first end surface extending in the width direction of the winding core and a second end surface opposite to the first end surface is arranged on the surface for fixing a part of the sheet to the winding core. A step, a step of fixing a part of the sheet to the winding core via the fixing member, and an intermediate roll body having a second gap and a third gap by winding the sheet around the winding core at least once. A step of applying a coating material to the surface of the sheet constituting the outer peripheral surface of the intermediate roll body along the width direction of the winding core, and a step of applying the coating material and then the winding core. A step of rewinding the sheet is provided, and the second gap is a gap located between the winding core and the sheet on the first round and in contact with the first end surface of the fixing member. The third gap is a gap located between the winding core and the sheet on the first round and in contact with the second end surface of the fixing member, and the coating material is the outer periphery of the intermediate roll body. A manufacturing method, which is applied to at least one of a second region corresponding to the second gap and a third region corresponding to the third gap on the surface of the sheet constituting the surface.

[5] The production method according to any one of the above [1] to [4], wherein the coating material has fluidity.

[6] The production method according to any one of the above [1] to [5], wherein the coating material is a curable polymer composition.

[7] The production method according to any one of [1] to [6] above, wherein the coating material contains a coloring material or a light emitting material.

[8] The production method according to any one of the above [1] to [6], wherein the sheet has a resin film.

[9] The production method according to any one of the above [1] to [7], wherein the sheet contains an acrylic resin, a polyester resin, or a cycloolefin polymer resin.

[10] The production method according to the above [8] or [9], wherein the thickness of the sheet is 15 μm or more and 300 μm or less.

[11] The production method according to any one of the above [1] to [10], wherein the sheet is a laminate having a base material and one or more functional layers laminated on the base material.

[12] The production method according to any one of [1] to [11] above, wherein the sheet is used for an optical film, a polarizing plate, or a display device.

[13] A roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core, located between the winding core and the sheet on the first round, and said. The first gap in contact with the tip surface located in the longitudinal direction at the winding start end of the sheet in the longitudinal direction on the first lap, and the first filling that fills the first gap and extends in the width direction of the winding core. A roll body that includes a part.

[14] The winding is provided between the winding core and the sheet on the first round, has a first end surface extending in the width direction of the winding core, and a second end surface opposite to the first end surface. A fixing member that fixes a part of the sheet to the core, a second gap that is located between the winding core and the sheet on the first round and is in contact with the first end surface of the fixing member, and the winding core. A third gap located between the sheet and the sheet on the first lap and in contact with the second end surface of the fixing member, and a second filling portion filled in the second gap and extending in the width direction of the winding core. The roll body according to the above [11], further comprising at least one of a third filling portion filled in the third gap and extending in the width direction of the winding core.

[15] A roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core, located between the winding core and the sheet on the first round, and said. The first region corresponding to at least the first gap between the first lap and the first lap and the first lap and the first lap and the first lap and the first lap A roll body provided with a first intervening portion extending in the width direction of the winding core.

[16] A roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core, which is provided between the winding core and the sheet on the first lap and is wound. A fixing member having a first end surface extending in the width direction of the core and a second end surface opposite to the first end surface and fixing a part of the sheet to the winding core, and the winding core and the first circumference. A second gap located between the sheets and in contact with the first end surface of the fixing member, and between the winding core and the sheet on the first circumference, and the second end surface of the fixing member. A third gap in contact with the third gap, a second filling portion filled in the second gap and extending in the width direction of the winding core, and a third filling portion filled in the third gap and extending in the width direction of the winding core. A roll body comprising at least one of the parts.

[17] A roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core, which is provided between the winding core and the sheet on the first lap and is wound. A fixing member having a first end surface extending in the width direction of the core and a second end surface opposite to the first end surface and fixing a part of the sheet to the winding core, and the winding core and the first circumference. A second gap located between the sheets and in contact with the first end surface of the fixing member, and between the winding core and the sheet on the first lap, and the second end surface of the fixing member. A second intervening portion provided in a second region corresponding to the second gap between the third gap in contact with the winding core and the sheet after the first lap, and extending in the width direction of the winding core, and the first lap and after. A roll body comprising at least one of a third intervening portion provided in a third region corresponding to the third gap between the sheets and extending in the width direction of the winding core.

[18] The above-mentioned [13] or [14], further comprising a fourth intervening portion that is connected to the first filling portion and is interposed between the sheet on the first lap and the sheet on the second lap. Roll body.

[19] When the fourth intervening portion that is continuously provided in the first filling portion and is interposed between the sheet on the first lap and the sheet on the second lap does not exist, the said in the first filling portion. When the ratio of the length L1 of the sheet in the first filling portion along the longitudinal direction to the thickness T2 at the position in contact with the tip surface is 90 or more and the fourth intervening portion is present, the said. The length L1 of the sheet in the first filling portion along the longitudinal direction with respect to the thickness T2 at the position in contact with the tip surface of the first filling portion and along the longitudinal direction of the sheet in the fourth intervening portion. The roll body according to any one of the above [13] and [14], wherein the total ratio of the lengths L2 is 90 or more.

[20] When the fourth intervening portion is not present, the outer peripheral surface of the winding core in a plane including the longitudinal direction of the sheet and the radial direction of the winding core with respect to the thickness T2 of the first filling portion. When the ratio of the area S1 of the region sandwiched between the surface of the first filling portion and the surface of the first filling portion is 3.0 or more and the fourth intervening portion is present, the said is made with respect to the thickness T2 of the first filling portion. The area S1 of the region sandwiched between the outer peripheral surface of the winding core and the surface of the first filling portion in the plane including the longitudinal direction of the sheet and the radial direction of the winding core, and the outer peripheral surface of the winding core and the fourth interposition. The roll body according to the above [19], wherein the ratio of the total area S2 of the regions sandwiched by the surfaces of the portions is 3.0 or more.

[21] When the thickness of the second intervening portion is measured along the longitudinal direction of the sheet, the second intervening portion on the fixing member side of the second intervening portion in the longitudinal direction with respect to the maximum thickness T6 of the second interposing portion. The roll body according to the above [17], wherein the ratio of the length L4 from the second tip opposite to the first tip to the position where the maximum thickness T6 of the second intervening portion is 12 or more.

[22] From the second tip of the second intervening portion to the position where the maximum thickness T6 is obtained in the plane including the longitudinal direction of the sheet and the radial direction of the winding core with respect to the maximum thickness T6 of the second interposing portion. The roll body according to the above [21], wherein the ratio of the cross-sectional area S3 of the second intervening portion is 2.5 or more.

[23] The roll body according to the above [15] or [17], wherein the sheet has convex portions protruding in the radial direction of the winding core at both ends extending along the longitudinal direction of the sheet.

[24] The roll body according to any one of the above [13] to [23], wherein the sheet has a resin film.

[25] The roll body according to any one of [13] to [23] above, wherein the sheet contains an acrylic resin, a polyester resin, or a cycloolefin polymer resin.

[26] The roll body according to the above [24] or [25], wherein the thickness of the sheet is 15 μm or more and 300 μm or less.

[27] The roll body according to the above [13], wherein the first filling portion contains a coloring material or a light emitting material.

[28] The roll body according to the above [14] or [16], wherein the second filling portion and the third filling portion contain a coloring material or a light emitting material, respectively.

[29] The roll body according to the above [15], wherein the first interposition portion contains a coloring material or a light emitting material.

[30] The roll body according to the above [17], wherein the second interposition portion and the third interposition portion contain a coloring material or a light emitting material, respectively.

[31] The roll body according to the above [13], wherein the first filling portion contains a cured product of a curable polymer composition.

[32] The roll body according to the above [14] or [17], wherein the second filling portion and the third filling portion each contain a cured product of a curable polymer composition.

[33] The roll body according to the above [15], wherein the first interposition portion contains a cured product of a curable polymer composition.

[34] The roll body according to the above [17], wherein the second interposition portion and the third interposition portion each contain a cured product of a curable polymer composition.

[35] The production method according to any one of [13] to [34] above, wherein the sheet is a laminate having a base material and one or more functional layers laminated on the base material.

[36] The manufacturing method according to any one of [13] to [35] above, wherein the sheet is used for an optical film, a polarizing plate, or a display device.

According to one aspect of the present invention, it is possible to provide a method for manufacturing a roll body capable of effectively alleviating a step caused by a winding start end portion of a sheet and such a roll body. Further, according to another aspect of the present invention, it is possible to provide a method for manufacturing a roll body capable of effectively alleviating a step caused by a fixing member and such a roll body.

FIG. 1 is a perspective view of a roll body according to the first embodiment. FIG. 2 is a plan view of a sample for specifying a position for measuring the in-plane phase difference. FIG. 3 is an enlarged view of a part of the roll body of FIG. FIG. 4 is a diagram for explaining the dimensions of each component of the roll body of FIG. FIG. 5 is an enlarged view of the vicinity of the tip end portion of the first filling portion of the roll body of FIG. FIG. 6 is a diagram showing a region R1 and a region R2 in the roll body of FIG. FIG. 7 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 8 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 9 is a plan view of the roll body for specifying the measurement position by the laser displacement meter. FIG. 10 is an image graph of the amount of displacement with respect to the position created based on the measurement of the laser displacement meter. FIG. 11 is an enlarged view of a part of the image graph of FIG. 10 in order to obtain the areas S1 and S2. FIG. 12 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 13 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 14 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 15 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 16 is an enlarged view of a part of another roll body according to the first embodiment. 17 (A) and 17 (B) are views schematically showing the manufacturing process of the roll body according to the first embodiment. 18 (A) and 18 (B) are views schematically showing the manufacturing process of the roll body according to the first embodiment. 19 (A) to 19 (C) are diagrams schematically showing a manufacturing process of another roll body according to the first embodiment. 20 (A) and 20 (B) are diagrams schematically showing other manufacturing processes of the roll body according to the first embodiment. 21 (A) and 21 (B) are diagrams schematically showing other manufacturing processes of the roll body according to the first embodiment. 22 (A) to 22 (D) are diagrams schematically showing other manufacturing processes of the roll body according to the first embodiment. 23 (A) to 23 (C) are diagrams schematically showing other manufacturing processes of the roll body according to the first embodiment. 24 (A) and 24 (B) are diagrams schematically showing other manufacturing processes of the roll body according to the first embodiment. FIG. 25 is a perspective view of the roll body according to the second embodiment. FIG. 26 is an enlarged view of a part of the roll body of FIG. 25. FIG. 27 is a diagram for explaining the dimensions of each component of the roll body of FIG. 25. FIG. 28 is a diagram when measuring the maximum thickness and length of the second interposition portion shown in FIG. 25. FIG. 29 is a diagram showing a cross-sectional area S3. FIG. 30 is an enlarged view of a part of another roll body according to the second embodiment. FIG. 31 is an enlarged view of a part of another roll body according to the second embodiment. FIG. 32 is an enlarged view of a part of another roll body according to the second embodiment. FIG. 33 is an enlarged view of a part of another roll body according to the second embodiment. FIG. 34 is an enlarged view of a part of another roll body according to the second embodiment. FIG. 35 is an enlarged view of a part of another roll body according to the second embodiment. FIG. 36 is an enlarged view of a part of another roll body according to the second embodiment. FIG. 37 is an enlarged view of a part of another roll body according to the second embodiment. 38 (A) to 38 (C) are views schematically showing the manufacturing process of the roll body according to the second embodiment. 39 (A) and 39 (B) are views schematically showing the manufacturing process of the roll body according to the second embodiment. FIG. 40 (A) is a graph showing the amount of displacement of the roll body according to the seventh embodiment with respect to the position around the first filling portion, and FIG. 40 (B) is the first filling of the roll body according to the eighth embodiment. FIG. 40 (C) is a graph showing the amount of displacement with respect to the position around the portion, and FIG. 40 (C) is a graph showing the amount of displacement with respect to the position around the first filled portion of the roll body according to the ninth embodiment.

[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 a roll body according to the present embodiment, FIG. 2 is a plan view of a sample for specifying a position for measuring an in-plane phase difference, and FIG. 3 is a roll body of FIG. 4 is an enlarged view of a part of the above, FIG. 4 is a view for explaining the dimensions of each component of the roll body of FIG. 1, and FIG. 5 is a view showing the tip of the first filling portion of the roll body of FIG. It is an enlarged view around the part. FIG. 6 is a diagram showing a region R1 and a region R2 in the roll body of FIG. 1, FIG. 9 is a plan view of the roll body for specifying a measurement position by a laser displacement meter, and FIG. 10 is a laser displacement. It is an image graph of the displacement amount with respect to the position created based on the measurement of the meter, and FIG. 11 is an enlarged view of a part of the image graph of FIG. 10 in order to obtain the areas S1 and S2. 7, FIG. 8, and FIGS. 12 to 16 are enlarged views of a part of another roll body according to the present embodiment. 17 to 19 are views schematically showing the manufacturing process of the roll body according to the present embodiment. 20 to 24 are diagrams schematically showing other manufacturing processes of the roll body according to the present embodiment.

<<< Roll body >>
The roll body 10 shown in FIG. 1 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 FIG. 3, the roll body 10 is located between the winding core 11 and the sheet 12 and the first filling portion 14 filled in the first gap 13 located between the winding core 11 and the sheet 12. A second filling portion 16 filled in the second gap 15 and a fixing member 17 for fixing a part of the sheet 12 to the winding core 11 are further provided. Further, the roll body 10 is further provided with a fourth intervening portion 18 which is connected to the first filling portion 14 and is interposed between the sheet 12 on the first lap and the sheet 12 on the second lap. Although the roll body 10 shown in FIG. 3 includes the fourth intervening portion 18, it does not have to include the fourth intervening portion as in the roll body 10 shown in FIG. 7. The sheet 12 is wound around the winding core 11 by a plurality of turns, for example, two or more turns.

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

The width W1 of the winding core 11 (see FIG. 1) is not particularly limited, but 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 is 30 m or less. It may be 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 obtained by measuring the width of the winding core at 10 points and obtaining the arithmetic mean value of the width of 8 points excluding the maximum value and the minimum value among the measured widths of the 10 points.

The outer diameter of the winding core 11 is not particularly limited, but 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 is 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. There may be. The outer diameter of the winding core is obtained by measuring the outer diameter of the winding core at 10 points and obtaining the arithmetic mean value of the outer diameters of 8 points excluding the maximum value and the minimum value among the measured outer diameters of the 10 points. be able to.

When the winding core 11 has a cylindrical shape, the inner diameter of the winding core 11 is not particularly limited, but 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, 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 obtaining the arithmetic mean value of the inner diameters of 8 points excluding the maximum value and the minimum value among the measured inner diameters of the 10 points.

In order to alleviate the step caused by the winding start end of the sheet, a step may be formed on the outer peripheral surface of the winding core where the sheet contacts so that the position of the sheet winding start end is lowered by the thickness of the sheet. However, such a step is not formed in the portion of the outer peripheral surface 11A of the winding core 11 in contact with the sheet 12. By using a winding core 11 having no step on the outer peripheral surface 11A, it is possible to handle sheets 12 having various thicknesses. In the present specification, "a step is not formed in the portion of the outer peripheral surface of the winding core in which the sheet contacts" means the central portion of the winding core and the circumference of each portion separated from the central portion by 100 mm or more in the width direction of the winding core. In, it is assumed that there is no portion where the difference in height is 3 μm or more. A step may be formed on the outer peripheral surface 11A of the winding core 11 where the sheet 12 is in contact, so that the height difference is less than 3 μm.

The material constituting the winding core 11 is not particularly limited. Examples of the material constituting the winding core 11 include paper, plastic, metal and the like. Paper also includes paper impregnated with resin. Examples of plastics include fiber reinforced plastics (FRP / Fiber Reinforced Plastics), polyolefins such as polyethylene (PE) and polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), and acrylonitrile-butadiene-styrene copolymer (ABS). ), Phenolic resin, nylon and the like. Among these, fiber reinforced plastic (FRP) is preferable from the viewpoint of weight, workability and strength, for example, in the case of coating for optics. Examples of fiber-reinforced plastics include those obtained by hybridizing fibers such as glass, epoxy, polyester, carbon, and aramid with a main body made of epoxy resin or phenol resin. Examples of the metal include iron, stainless steel (SUS), aluminum and the like.

<< Sheet >>
The sheet 12 has a long shape. Specifically, the sheet 12 is sufficiently thin with respect to the width and sufficiently long in length.

The width W2 of the sheet 12 (see FIG. 1) is not particularly limited, but may be, for example, 0.1 m or more and 50 m or less. The "sheet width" in the present specification means the length of the sheet in the lateral direction (width direction of the winding 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 more. Below, it may be 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 obtaining the arithmetic mean value of the widths of 8 points excluding the maximum value and the minimum value among the measured widths of the 10 points.

The width W2 of the sheet 12 is preferably smaller than the width W1 of the winding core 11. As a result, the sheet 12 can be reliably held by the winding core 11.

The length of the sheet 12 may be, for example, 20 m or more and 10000 m or less. As used herein, the term "sheet length" means the length of a sheet in the longitudinal direction. 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 9000 m or less or 8000 m or less.

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 is 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. May be good. Depending on the application, when a thin film is preferred, it is not limited to this, and it is preferably 3 μm or more and less than 50 μm, and further preferably 40 μm or less. The thickness of the sheet can be obtained by measuring the thickness of the sheet at 10 points and obtaining the arithmetic mean value of the thickness of 8 points excluding the maximum value and the minimum value among the measured thicknesses of the 10 points. The step is less likely to occur when the sheet is thick, but becomes more remarkable as the sheet becomes thinner. The present invention is particularly effective when the thickness of the sheet is thin (80 μm or less, less than 50 μm, and further 40 μm or less).

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 remarkable as the thickness of the sheet becomes thinner, but when the thickness of the sheet becomes extremely thin, the step tends to become smaller on the contrary. For example, when there is a heating step of 50 ° C. or higher in the subsequent step, if the sheet is thin, the deformation due to the step may be eliminated. However, if the thickness of the sheet is a certain thickness (for example, 15 μm or more), the above deformation may not be eliminated even if the heating step is performed. Therefore, it is particularly effective when the thickness of the sheet 12 is 15 μm or more. Further, when the sheet 12 contains any of these resins, if the thickness of the sheet is too thick, a large amount of coating material is required. Therefore, from the viewpoint of cost reduction, the thickness of the sheet 12 is preferably 300 μm or less. Further, when any of these resins is contained, a step may not easily occur if the thickness exceeds 300 μm. When the sheet 12 contains any of these resins, the lower limit of the thickness of the sheet 12 is more preferably 20 μm or more, 35 μm or more, or 50 μm or more, and the upper limit of the thickness of the sheet 12 is 250 μm or less and 200 μm or less. , 150 μm or less, or more preferably 100 μm or less. When any of these resins is included, it is particularly effective at a thickness that is neither too thin nor too thick.

Further, when the fixing member 17 is provided, since the sheet 12 is arranged on the fixing member 17, the total thickness of the sheet 12 and the fixing member 17 affects the step caused by the winding 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, the thickness of the sheet 12 is preferably thin, and therefore the upper limit thereof is preferably 130 μm or less, more preferably 90 μm or less. Further, when the fixing member is an adhesive tape, if the thickness of the fixing member exceeds 15% of the thickness of the sheet, the influence on the step is more likely to occur. Therefore, the thickness of the sheet 12 should not be too thin, and the lower limit of the thickness of the sheet 12 is preferably, for example, 20 μm or more or 35 μm or more.

Examples of the sheet include film, metal leaf, paper and the like. The film may be, for example, a resin film. When a resin film is used in an application that requires light transmission (for example, an optical film application), the resin film preferably has light transmission. The resin constituting such a resin film is not particularly limited as long as it has light transmittance, but for example, acrylic resin, polyolefin resin (polyethylene resin, polypropylene resin, cycloolefin polymer resin), polycarbonate. Based resin, polyacrylate resin, polyester resin (polyethylene terephthalate, polyethylene naphthalate, etc.), aromatic polyether ketone resin, polyether sulfone resin, acetyl cellulose resin (for example, triacetyl cellulose resin), Examples thereof include a polyimide resin, a polyamideimide resin, a polyamide resin, and a mixture of two or more of these resins. Among these, resin films having relatively high flexibility, for example, acrylic resins, polyolefin resins, polyester resins, acetyl cellulose resins, polyimide resins, polyamideimide resins, or resin films containing polyamide resins are available. The technique of the present invention is effective because it is easily deformed by a step caused by the winding start end of the sheet and a step caused by the fixing member. Further, in recent years, a low moisture permeable resin having less distortion and low water permeability has been preferably used for large displays. In the case of a large display, the entire seat width is often a product, so if any deformation due to a step remains, the entire sheet must be discarded. For example, acrylic resins, polyester resins, and cycloolefin polymer resins are preferably used for large displays, but according to the technique of the present invention, deformation due to steps can be satisfactorily prevented and mass productivity can be improved. Therefore, the technique of the present invention is particularly effective for sheets made of these resins. Further, when thinness is required in the final product, for example, when a film having a thickness of less than 50 μm is used, the technique of the present invention is suitable for a film of any material.

When the sheet 12 is used for an optical film and particularly contains an acrylic resin or a cycloolefin polymer resin, the in-plane retardation (retalation: Re) of the sheet 12 may be 10 nm or less. preferable. The fact that the in-plane retardation Re of the sheet 12 is 10 nm or less means that the optical strain is small, and it can be said that there is almost no residual stress during the manufacture of the sheet 12. That is, the fact that the in-plane retardation Re of the sheet 12 is 10 nm or less means that the polymer in the sheet 12 is uniform. Therefore, when the sheet 12 is made into a long roll, the sheet 12 is caused by some step. It is preferable because it is less likely to cause a new step due to the polymer state inside. 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 that color unevenness and blackout, which are problems when used in combination with a polarizer, are unlikely to occur in display applications. preferable. Further, in the case of acrylic resin, in the case of optical applications, the phenomenon of whitening when bent unlike the conventional acrylic resin film does not occur, and the haze value (total haze value) is 1% or less or 0.5. It is preferably as small as% or less.

Further, even when the sheet 12 is used for an optical film and contains a polyester resin, it is preferable that the polymer in the sheet 12 is uniform as described above because new steps are less likely to occur due to the internal polymer state. When the sheet 12 contains a polyester resin, stretching is indispensable in order to obtain physical strength. Therefore, in order to make the polymer state as uniform as possible, the sheets 12 are sequentially or simultaneously biaxially stretched at substantially the same magnification in the vertical and horizontal directions. Good to manufacture. As a result, a sheet containing a polyester resin having a smaller in-plane phase difference than the conventional one can be obtained. The small in-plane retardation means that the thickness of the sheet is 10 μm to 90 μm and the in-plane retardation is 1500 nm or less, preferably 1200 nm or less, more preferably 1000 nm or less, and further preferably 800 nm or less. is there. In order to improve the physical characteristics such as elastic modulus and tear strength of the biaxially stretched polyester as a plastic film, the in-plane phase difference should not be too small, preferably 200 nm or more, more preferably 400 nm or more.

Further, in order to further improve the physical characteristics, it is better to consider the balance between the birefringence in the in-plane direction and the birefringence in the film thickness direction. The index is the Nz coefficient. Since the Nz coefficient is affected by the crystallinity and orientation inside the film, it is related to the characteristics of the entire sheet. The Nz coefficient is usually 2 to 4 in the case of polyethylene terephthalate, for example, but it is said that a new step is unlikely to occur due to the polymer state in the sheet due to some step, especially in the case of a long roll. In terms of points, it is preferably 5 or more, more preferably 8 or more, and most preferably 10 or more. The upper limit of the Nz coefficient is about 80, preferably 70 or less, and most preferably 50 or less.

The in-plane phase difference (Re) is the refractive index nx in the slow-phase axial direction, which is the direction in which the refractive index is maximum in the in-plane of the sheet, and the phase-advancing axial direction, which is the direction orthogonal to the slow-phase axial direction in the in-plane. It is expressed by the following formula (1) by the refractive index ny of and the thickness t (nm) of the sheet. From the following mathematical formula (1), it can be seen that a small in-plane phase difference tends to improve bending resistance because the degree of orientation is low. The in-plane phase difference (Re) can be measured by, for example, the product name "RETS-100" manufactured by Otsuka Electronics Co., Ltd., the product name "KOBRA-WR" manufactured by Oji Measuring Instruments Co., Ltd., and "PAM-UHR100".
In-plane phase difference (Re) = (nx-ny) x t ... (1)

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

When measuring the above Re using RETS-100, it can be measured according to the following procedure. First, in order to stabilize the light source of RETS-100, the light source is turned on and then left for 60 minutes or more. After that, the rotary photon method is selected and the θ mode (angle direction phase difference measurement mode) is selected. By selecting this θ mode, the stage becomes an inclined rotation stage.

Next, the following measurement conditions are input to RETS-100.
(Measurement condition)
・ Reference measurement range: Rotational photon method ・ Measurement spot diameter: φ5 mm
-Inclination angle range: -40 ° to 40 °
-Measurement wavelength range: 400 nm to 800 nm
-Average refractive index of the sample (for example, in the case of PET, N = 1.617, and in the case of an acrylic resin film, 1.5).
-Thickness: Thickness separately measured by SEM or optical microscope

Next, obtain background data without installing a sample in this device. The device will be a closed system and this will be done each time the light source is turned on.

After that, the sample is installed on the stage in this device. The shape of the sample may be any shape, for example, a rectangular shape. The size of the sample may be 50 mm × 50 mm. If there are multiple samples, they must all be installed in the same orientation. For example, it is preferable to mark all samples in advance so that all the samples are placed in the same orientation.

After installing 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%, and measure the phase advance axis and phase delay axis. After the measurement is completed, select the slow phase axis. After that, the measurement is performed while tilting to the angle range set by the stage about the slow phase axis, and the data (Re) of the set tilt angle range and the set wavelength range is obtained in increments of 10 °. The in-plane phase difference Re is a value measured with light having an incident angle of 0 ° and a wavelength of 589 nm. The in-plane phase difference Re is measured at five points at different positions. Specifically, first, as shown in FIG. 2, two orthogonal virtual lines IL1 and IL2 passing through the center A1 of the sample SA are drawn. When the virtual lines IL1 and IL2 are drawn, the sample is divided into four sections. Then, in each section, one point equidistant from the center A1 and a total of four points A2 to A4 are set, and measurement is performed at a total of five points of the center A1 and points A2 to A4. Then, the arithmetic mean value of 3 points excluding the maximum value and the minimum value among the measured values of 5 points is defined as the in-plane phase difference Re.

The sheet 12 may have a single-layer structure, but may have a laminated structure in which two or more layers are laminated. Specifically, the sheet 12 may be a single base material or a single functional layer, but is, for example, a laminated body (for example, an optical laminated body) in which one or more functional layers are formed on the base material. May be good. The "functional layer" in the present specification is a layer intended to exert some function in the laminated body. Specifically, the functional layers include, for example, an underlayer, a hard coat layer, a shock absorbing layer, an antiglare layer, an antistatic layer, a conductive layer, a heat radiating layer, an ultraviolet absorbing layer, a special wavelength absorbing layer, and a special wavelength transmitting layer. , Color reproducibility improving layer, liquid crystal layer, phase difference adjusting layer, viewing angle adjusting layer, reflective layer, colored layer, antireflection layer (high refractive index layer, low refractive index layer), antifouling layer, water repellent layer, repellent Examples include an oil layer and the like, or a combination thereof. The "functional layer" in the present specification may have a single-layer structure or a laminated structure. However, in the present specification, the "functional layer" is a layer that exists even when the sheet 12 is used, and does not include a release liner that is peeled off at the time of use. If the release liner is present on the sheet, defects are likely to occur, and a new step different from the above step is likely to occur. If the release liner is provided on the sheet 12, the release liner is wound around the winding core 11 in a peeled state.

The use of the sheet 12 is not particularly limited, and examples thereof include optical use (optical film use, polarizing plate use, display device use), joinery use, automobile interior decoration use, battery member use, food packaging material use, and the like. Be done. Among these, in the optical film, if there is a step due to the winding start end of the sheet or a step due to the fixing member, not only the appearance but also the light transmission may be affected. Technology is particularly effective for optical applications.

The sheet 12 includes a winding start end portion 12A (see FIG. 3) and a winding end end portion 12B (see FIG. 1). In the roll body 10, the winding start end portion 12A is located on the inner side (winding core 11) side of the winding end end portion 12B. In the roll body 10, as shown in FIG. 3, the tip surface 12A1 located in the longitudinal direction DR2 at the winding start end portion 12A has a cross section along the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11. , It is almost aligned with the second end surface 17B of the fixing member 17, which will be described later. In the present specification, "almost aligned" means that the distance between the tip surface 12A1 and the second end surface 17B in the longitudinal direction DR2 of the winding start end portion 12A is ± 20% of the width W3 (see FIG. 4) of the fixing member 17. It means that it is within. The "+" means that the tip surface 12A1 protrudes from the second end surface 17B, and the "-" means that the tip surface 12A1 is recessed from the second end surface 17B (that is, the second end surface 17B). Protrudes from the tip surface 12A1).

<< Fixing member >>
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. As a result, a part of the sheet 12 can be fixed to the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11.

The fixing member 17 has a second end surface 17B opposite to the first end surface 17A. Both the first end surface 17A and the second end surface 17B extend in the width direction DR1 of the winding core 11.

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 portion 12A of the sheet 12, and the winding start end portion 12A of the sheet 12 is in close contact with the outer peripheral surface 11A of the winding core 11. Is fixed. If it is the first lap of the sheet 12, the sheet 12 may be fixed at a portion other than the winding start end portion 12A. In FIG. 3, all the surfaces of the fixing member 17 are in close contact with the winding start end portion 12A, but as shown in FIG. 8, the winding start end portion 12A does not cause a problem when winding the fixing member 17. The first filling portion 14 may be inserted between the winding start end portion 12A and the fixing member 17 as long as the winding start end portion 12A is fixed to the extent that the winding start end portion 12A does not peel off from the fixing member 17 at the time of winding. ..

The fixing member 17 is not particularly limited, and examples thereof include an adhesive member and an adhesive member such as double-sided tape. The fixing member 17 may have elasticity (cushioning property). The adhesive member has adhesiveness on both sides.

The width W3 (see FIG. 4) of the fixing member 17 is preferably 5 mm or more and 100 mm or less. If the width W3 of the fixing member 17 is 5 mm or more, a 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 is not wrinkled. The sheet 12 can be wound around the circumference. The "width of the fixing member" in the present specification shall mean 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.

The thickness of the fixing member 17 is preferably 3 μm or more and 600 μm or less. If the thickness of the fixing member 17 is 3 μm or more, a part of the outer peripheral surface 11A of the winding core 11 can be reliably fixed, and if it is 600 μm or less, the deformation of the sheet 12 can be further suppressed. The lower limit of the thickness of the fixing member 17 is preferably 5 μm or more, 10 μm or more, or 20 μm or more, and the upper limit is preferably 200 μm or less, 100 μm or less, or 50 μm or less. The thickness of the fixing member can be obtained by measuring the thickness of the fixing member at 10 points and obtaining the arithmetic mean value of the thickness at the 10 points.

<First gap>
The first gap 13 is a gap in contact with the tip surface 12A1 located in the longitudinal direction DR2 (see FIG. 3) at the winding start end 12A. Specifically, the first gap 13 shown in FIG. 3 includes an outer peripheral surface 11A of the winding core 11, a back surface 12C of the sheet 12 on the first circumference, a tip surface 12A1 of the winding start end portion 12A, and a fixing member 17. It is a gap surrounded by the second end surface 17B of the above. When 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 sheet on the first round, and the tip surface of the winding start end portion.

The first gap 13 is a gap that is in contact with the tip surface 12A1 and is also a gap that is located between the winding core 11 and the sheet 12 on the first lap and is in contact with the second end surface 17B. is there.

<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. 3 is a gap surrounded by the outer peripheral surface 11A of the winding core 11, the back surface 12C of the sheet 12 on the first circumference, and the first end surface 17A of the fixing member 17. is there.

<First filling part>
The first filling portion 14 is filled in the first gap 13. That is, the first filling portion 14 is formed on the outer peripheral surface 11A of the winding core 11, the back surface 12C of the sheet 12 on the first circumference, the tip surface 12A1 of the winding start end portion 12A, and the second end surface 17B of the fixing member 17. I'm in contact. When the fixing member 17 is not provided, the first filling portion is in contact with the outer peripheral surface of the winding core, the back surface of the sheet on the first round, and the tip surface of the winding start end portion. As used herein, the term "filling" means a state in which the gap is substantially filled with the material constituting the filling portion. However, there may be voids (for example, air bubbles) inside the filling portion.

The sheet 12 has an effective area used as a product and an ineffective area located on both sides of the effective area in the lateral direction of the sheet 12 and is not used as a product. At least in the effective domain. Since the effective region is a region used as a product, it is preferable that the first filling portion 14 exists over the entire width of the effective region in the width direction DR1 of the winding core 11. The first filling portion 14 may be present in the ineffective region as long as it is present in the effective region, but when the first filling portion 14 is present in the ineffective region, the first filling portion 14 is present. The first filling portion 14 does not exist in the ineffective region because there is a possibility that it may protrude from the sheet 12, and the ineffective region is an region that is not used as a product in the first place and it is not necessary to alleviate the above-mentioned step. May be good. The non-effective area varies depending on the intended use of the sheet and the width of the sheet, but is usually an area within 10 mm to 30 mm inward from both ends in the lateral direction of the sheet. When the first filling portion 14 is present in the ineffective region, the first filling portion 14 may be present at both ends of the sheet in the lateral direction, but from the viewpoint of suppressing protrusion, from both ends thereof. It is preferable that they are present at a distance of 1 mm or more, preferably 5 mm or more, and more preferably 10 mm or more toward the central portion of the sheet.

The edge thickness T1 (see FIGS. 4 and 5) of the tip portion 14A on the separation position P1 side where the sheet 12 on the first lap is separated from the winding core 11 in the first filling portion 14 is caused by this thickness. As a result, a new step may be formed, so a thinner step is preferable. As will be described later, depending on the purpose, it may be better for the edge thickness T1 to exist to some extent rather than not exist. The edge thickness T1 is preferably 50 μm or less, for example. The edge thickness T1 is 30 μm or less, 20 μm or less, 10 μm or less because the deformation relaxation length, which is the distance from the winding start end 12A to the point where the deformation due to the step of the winding start end 12A is no longer visible, can be shortened. Below, it is more preferably 5 μm or less, more preferably 2 μm or less. The more the step caused by the winding start end is relaxed, the more the deformation of the sheet caused by this step is relaxed, so that the deformation relaxation length becomes shorter. In the present specification, the "deformation relaxation length" is used to mean the length until the sheet deformation due to the step caused by the winding start end is alleviated, and the sheet deformation due to the step caused by the fixing member is used. It is sometimes used to mean the length until it becomes invisible. 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 invisible, the deformation relaxation length is caused by the step from the winding start end 12A to the fixing member 17. It is the distance to the point where the deformation to be made is no longer visible. 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, or 35 m or less, 20 m or less, 15 m or less. If the deformation relaxation length is 75 m or less, there are more parts where the sheet deformation is not visible, which is good. The deformation relaxation length is the length until the sheet deformation due to the step is not visible as described above, but whether or not there is a step is determined as follows. First, in an indoor environment of 800 Lux or more and 2000 Lux or less, a white light source tube (white LED lamp, white fluorescent lamp, etc.) is reflected on a long sheet, and the contour line of the white light source tube reflected on the sheet is formed. When there is a part that is distorted compared to other parts of the sheet, it can be judged that there is a step, and it can be judged that the contour line of the white light source tube reflected in the vicinity of the step is the same as the other part of the sheet. Judge that there is no step in the part. The white light source tube is arranged so that the longitudinal direction of the white light source tube is along the longitudinal direction of the sheet. The length of the white light source tube can also be changed depending on the width and length of the sheet. Specifically, the length of the white light source tube is preferably a length extending over a portion of the sheet where a step is present and a portion where the step is not present. This makes it easier to see where the step exists. Further, if the observation environment is as bright as described above, the white light source tube itself may or may not be lit. At the time of observation, it is important that the white light source tube is reflected on the sheet and the contour line can be seen. Therefore, as the observation condition, the one in which the contour line of the white light source tube can be clearly seen is appropriately selected. For example, if the outline of the white light source tube is more visible on the back surface of the sheet than on the front surface of the sheet, the white light source tube may be projected on the back surface of the sheet to check if there is a step. .. Specifically, in the case of a laminated body in which a functional layer such as an antiglare layer on the surface side of the base material is laminated to prevent the white light source tube from being reflected, is there a step when observed from the antiglare layer side? It may be difficult to confirm. Therefore, in this case, it is advisable to project the white light source tube on the back surface side of the base material on which the antiglare layer is not laminated to check whether or not there is a step. This determination can also be used for rolls for various purposes, such as a laminate in which one or more functional layers are laminated on a substrate, or a laminate in which it is attached to a polarizer. For example, when an antiglare layer is laminated on the base material as a functional layer, it is possible to judge by the fact that the uneven shape that exerts the antiglare function by pressure is crushed and the shadows appear to be colored in the part where the step exists. is there. In addition, when various functional layers are laminated and it is difficult for the white light source tube to be reflected on the visible side surface of the roll body or the opposite surface, coloring different from other parts can be seen due to the shape change as described above. It can be judged by that.

Further, when the sheet 12 is a thin film having a thickness of 3 μm or more and less than 50 μm, it is more susceptible to the step caused by the winding start end portion 12A than when the thickness is thick. Therefore, when such a thin film is used, The edge thickness T1 is preferably 10 μm or less, and more preferably 7 μm or less, 5 μm or less, and further preferably 1 μm or less from the viewpoint of minimizing the deformation relaxation length.

From the viewpoint of minimizing the deformation relaxation length, the edge thickness T1 is preferably the above-mentioned thickness, but the surface of the winding core is surface-finished and may have irregularities. Since the material constituting the first filling portion is embedded along the unevenness at the tip portion of the first filling portion, a portion where the edge thickness T1 exists and a portion where the edge thickness T1 does not exist may occur, resulting in unevenness. .. However, if the edge thickness T1 is thin, even if such unevenness occurs, there is no actual harm. Therefore, when unevenness is present and unevenness occurs, it is preferable that the edge thickness T1 is thin. Specifically, for example, the edge thickness T1 is 15 μm or less, 10 μm or less, 5 μm or less, and further 1 μm. The following is preferable.

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 roll body is used. For this reason, the winding core is required to have a reworkability to reuse the winding core by peeling the filling portion in contact with the winding core such as the first filling portion from the winding core, or removing it by cleaning or wiping. .. Therefore, for example, it is preferable that the first filling portion 14 is not adhered to the winding core 11 as described later. Further, it is preferable that the sheet 12 can be neatly peeled off from the first filling portion 14 at the portion where the first filling portion 14 is in contact with the winding core 11 and the sheet 12, respectively. If the first filling portion 14 is coagulated and broken when the sheet 12 is peeled off from the first filling portion 14, it may be difficult to cleanly peel off all the first filling portions 14 from the winding core 11. .. On the other hand, if the edge thickness T1 is present, it triggers the sheet 12 to be peeled off. Therefore, from the viewpoint of reworkability, it is preferable that the edge thickness T1 is intentionally present. For example. From the viewpoint of reworkability, the edge thickness T1 is preferably 5 μm or more. The preferable thickness of the edge thickness T1 varies depending on the material of the winding core and the sheet, and the edge thickness T1 may be 1.5 μm or more, further 5 μm or more. The upper limit of the edge thickness is preferably 30 μm or less because a new step may be formed due to the thickness.

The edge thickness T1 can be measured using a scanning light interference type surface shape measuring machine. Examples of such a surface shape measuring machine include the "New View" series manufactured by Zygo.

Specifically, the edge thickness T1 can be obtained as follows using a scanning light interference type surface shape measuring machine (product name "New View7300", manufactured by Zygo). First, when all the sheets are fed out, the first filling portion 14 may adhere to the sheet 12 side and peel off from the winding core. When the first filling portion 14 is attached to the fed-out sheet 12 side, one or more samples having a size of 0.5 mm square or more including the tip portion 14A of the first filling portion 14 are obtained from the sheet. The sample is not limited to a square but may be a rectangle (for example, 2 mm × 5 mm) as long as it has a size of 0.5 mm square or more. The sample shall be cut out from an arbitrary portion containing the first filling portion 14 and to which dirt, fingerprints, etc. are not attached. 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 points and obtaining the arithmetic mean value of the thicknesses at 8 points excluding the maximum value and the minimum value among the measured thicknesses at the 10 points.
(Measurement condition)
-Objective lens: 10x-Zoom: 1x-Measurement area: 2.17mm x 2.17mm
・ Skan Length: 5 μm
・ Min mod: 0.015

The thickness T2 (see FIG. 4) of the first filling portion 14 at the position in contact with the tip surface 12A1 is thicker than the total thickness of the fixing member 17 and the sheet 12 when the fixing member 17 is present, and the fixing member When 17 is not present, it is preferably thicker than the thickness of the sheet 12. By setting the thickness T2 to such a thickness, it is possible to more effectively alleviate the step caused by the winding start end portion 12A. However, if the thickness T2 is too thick, the step caused by the winding start end portion 12A can be alleviated, but the winding of the sheet 12 may be adversely affected. Therefore, for example, when the thickness of the sheet 12 is 50 μm or more and 200 μm or less, the thickness T2 is preferably 52 μm or more and 220 μm or less, more preferably 52 μm or more and 150 μm or less, and the thickness of the sheet 12 is 3 μm or more and less than 50 μm. In some cases, the thickness T2 is preferably 50.5 μm or more and 100 μm or less.

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 thickness T2 may be measured differently depending on whether the fourth intervening portion 18 is present or not. When the fourth interposition portion 18 is not present, the measurement can be performed using a laser displacement meter or a stereomicroscope, and when the fourth interposition portion 18 is present, the measurement can be performed using a stereomicroscope. The thickness T2 is measured by a laser displacement meter or a stereomicroscope in an environment of a temperature of 23 ± 5 ° C. and a relative humidity of 50 ± 20%.

The thickness T2 can be measured with a laser displacement meter as follows. Since the following measurement method utilizes the reflection of laser light, it is particularly effective when the sheet 12 is transparent and the first filling portion is not transparent (for example, when it is 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 arranged at predetermined positions. The jig is inserted into the hole 11B of the winding core 11 in the width direction DR1 and is configured to rotatably hold the roll body 10. Although the LK-G30 is mentioned as the laser displacement meter, an equivalent laser displacement meter such as a successor model may be used instead of the LK-G30.

The laser displacement meter includes a laser source and a light receiving element. The laser light emitted from the laser source and reflected on the surface of the first filling portion 14 is received by the light receiving element, and the displacement is determined by the light receiving position of the light receiving element. It is a device that can measure.

Three laser displacement gauges are arranged above the roll body 10 so that the laser beam is emitted toward the surface of the roll body 10. The location of the laser displacement meter is as follows. First, as shown in FIG. 9, the first position B1 and the second position B2 that divide the width of the sheet 12 into three equal parts are determined. The first position B1 is located on the first end 12G1 side in the lateral direction of the sheet 12 (the width direction DR1 of the winding core 11), and the second position B2 is the second end 12G2 on the opposite side of the first end 12G1. Located on the side. The first laser displacement meter is arranged so that the laser beam is applied to the midpoint C1 of the first position B1 and the first end 12G1, and the second laser displacement meter is arranged at the first position B1 and the second position. The midpoint C2 of position B2 is arranged so that the laser beam is irradiated, and the third laser displacement meter is arranged so that the midpoint C3 of the second position B2 and the second end 12G2 is irradiated with the laser beam. Laser.

Then, the roll body 10 is attached to the jig, and the sheet 12 is fed out from the roll body 10 until the first filling portion 14 is exposed. After that, with the first filling portion 14 exposed, the displacement amount was continuously measured by a laser displacement meter with a sampling period of 200 μs while rotating the winding core 11 at a rotation speed of 30 mm / s, and the horizontal axis was positioned (mm). ), And a graph (see FIG. 10) in which the vertical axis is the displacement amount (mm) is obtained. This measurement is performed from the tip portion 14A of the first filling portion 14 to the position in contact with the tip end surface 12A1. In this measurement, the reference height (displacement amount 0 mm line) is defined as the height of the winding core 11, and is defined as the reference height. The difference in the amount of displacement of the first filling portion 14 is defined as the thickness of the first filling portion 14. Further, in this graph, one scale on the horizontal axis is 5 mm, and one scale on the vertical axis is 0.02 mm.

In this graph, the displacement amount increases from the tip portion 14A at the location where the first filling portion 14 exists, but the displacement amount sharply decreases after the position of the first filling portion 14 in contact with the tip surface 12A1. Therefore, the position E1 on the position displacement curve where the displacement amount starts to decrease sharply is found in the graph. Then, by obtaining the difference between the displacement amount 0 mm line and the displacement amount at the position E1, the thickness T2 at the position of the first filling portion 14 in contact with the tip surface 12A1 is obtained.

The thickness T2 can be measured with a stereomicroscope as follows. First, this portion is collected and fixed so that the portion including the winding start end portion 12A, the first filling portion 14, and the sheet 12 on the second lap is not crushed. Then, the cross section of this fixed portion is polished, and the thickness T2 of the first filling portion 14 is measured with a stereomicroscope (for example, product name "Digital Microscope VHX-7000", manufactured by KEYENCE CORPORATION). Although the digital microscope VHX-7000 is mentioned as the stereomicroscope, an equivalent stereomicroscope such as a successor model may be used instead of the VHX-7000.

Since both end portions 12G (see FIG. 1) extending in the longitudinal direction DR2 of the sheet 12 are not used as products, the length of the first filling portion 14 in the width direction DR1 of the winding core 11 is the length of the roll body 10. It may be smaller than the width W2 of the sheet 12 as long as it is equal to or larger than the effective area for commercialization.

The first filling portion 14 preferably contains a coloring material or a light emitting material. Since the first filling portion 14 contains a coloring material or a light emitting material, it is easy to visually confirm when the first filling portion 14 protrudes from the roll body 10. In addition, it becomes easy to check the thickness, length, and the like of the first filling portion 14.

When the first filling portion 14 is colored, the color of the first filling portion 14 is not particularly limited, but the existence of the first filling portion 14 can be surely grasped, and the components of the first filling portion 14 are wound. White or gray is preferable from the viewpoint that it is inconspicuous even if it adheres to the taking device.

When the first filling portion 14 is colored, the first filling portion 14 contains a coloring material. When the first filling portion 14 is a cured product of the 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. Examples of specific coloring materials include titanium oxide, carbon black, or a mixture thereof.

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

When the first filling portion 14 contains a light emitting material, the light emitting material is not particularly limited, and examples thereof include a fluorescent material and a phosphorescent material. When the first filling portion 14 contains a fluorescent material or a phosphorescent material, the fluorescent material or the phosphorescent material in the first filling portion 14 is emitted by irradiating the first filling portion 14 with light such as ultraviolet rays or visible light. Can be made to.

The shape of the surface 14B of the first filling portion 14 is preferably convex upward. If the shape of the surface 14B is convex upward, the sheet 12 can be lifted more than concave downward, so that the step can be alleviated. Whether or not the shape of the surface 14B is convex upward can be determined from the graph of the position displacement curve as in the thickness T2. Specifically, first, in the above graph, since the position is higher than the height of the winding core 11 at the position where the first filling portion 14 exists, the displacement amount increases. The position E2 (see FIG. 10), 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 grasped. Then, a virtual line IL3 (see FIG. 10) passing through the positions E1 and E2 is drawn. If the ratio of the number of peaks located above the virtual line IL3 to 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 14B of the first filling portion 14 is It can be judged that it is convex upward, and the number of peaks located below the virtual line IL3 among the number of peaks of 50% or more of the number of peaks of the position displacement curve existing between the positions E1 and E2. If the ratio is less than 50%, it can be determined that the shape of the first filling portion 14 is concave downward. If the virtual line IL3 and the position displacement curve overlap, it is determined that the virtual line IL3 is concave downward. In the graph for determining the shape of the first filling portion 14, one scale on the horizontal axis is 5 mm, and one scale on the vertical axis is 0.02 mm.

When the shape of the surface 14B of the first filling portion 14 is convex upward, the average distance D1 from the virtual line IL3 to the position displacement curve in the vertical axis direction is preferably 0.003 mm or more. When 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 the 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, more preferably 0.07 mm or less, because if it is excessively convex, it may cause a new step. The average distance D1 is defined by using the virtual line IL3 as a reference line, reading 7 points of peaks that are convex above the virtual line IL3, and averaging the values of 5 points excluding the maximum value and the minimum value. It is a thing. The peak to be read is the mountain part, and a large part is selected.

The slope 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 0.0050 or more and 0. It is more preferably .0060 or less. If the inclination is 0.0050 or more, the filling material can be filled without dents, and if it is 0.0060 or less, the filling material can be filled without large protrusions. 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. ..

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, it is possible to suppress a sudden change in height of the winding core 11 in the sheet 12 in the radial direction DR3 (normal direction of the outer peripheral surface 11A of the outer peripheral surface 11A). , The step caused by the winding start end 12A can be alleviated.

If the thickness of the first filling portion changes abruptly, the deformation will remain due to this change in thickness, and there is a risk that the step caused by the winding start end will not be sufficiently alleviated. Therefore, it is preferable to secure a sufficient length of the first filling portion with respect to the thickness of the sheet. However, if the length of the first filling portion is increased to have other effects such as winding, the length of the first filling portion is intentionally made shorter than the optimum state to obtain the optimum first. The deformation relaxation length is longer than that of the state having the length of the filling portion, but the deformation relaxation length can be shortened as compared with the case where the first filling portion is not provided. Therefore, when the fourth intervening portion 18 is present as shown in FIG. 4, along the longitudinal direction DR2 of the sheet 12 in the first filling portion 14 with respect to the thickness T2 at the position in contact with the tip surface 12A1 of the first filling portion 14. The ratio of the total length L1 (see FIG. 4) and the length L2 (see FIG. 4) along the longitudinal direction DR2 of the sheet 12 at the fourth interposition 18 ((length L1 + length L2) / thickness T2). Is preferably 90 or more. Further, when the fourth intervening portion 18 does not exist as shown in FIG. 7, the thickness T2 at the position in contact with the tip surface 12A1 of the first filling portion 14 is in contact with the tip surface 12A1 of the first filling portion 14. The ratio (length L1 / thickness T2) of the length L1 (see FIG. 7) along the longitudinal direction DR2 of the sheet 12 in the first filling portion 14 to the thickness T2 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 from the viewpoint of shortening the deformation relaxation length. The upper limit of these ratios is not particularly limited, but may be, for example, 1200 or less, 1000 or less, 800 or less, 500 or less, or 300 or less.

The length L1 is the length from the position in contact with the tip surface 12A1 of the first filling portion 14 along the longitudinal direction DR2 of the sheet 12 to the end on the separation position P1 side. The length L2 is the length from the position directly above the tip surface 12A1 along the longitudinal direction DR2 of the sheet 12 to the end on the position side where the sheet 12 on the first lap and the sheet 12 on the second lap come into contact with each other. The length L1 and the length L2 can be obtained from the graph of the position displacement curve in the same manner as the thickness T2. Specifically, first, the existence of the fourth intervening portion is confirmed by the method described later. When the fourth intervening portion is present, the position E1 and the position E2 are found from the graph of the position displacement curve. Next, a virtual line IL4 (see FIG. 10) that passes through the above position E2 and is perpendicular to the displacement amount 0 mm line is drawn. Then, assuming that the intersection of the virtual line IL4 and the displacement amount 0 mm line is the position E3, the total length of the length L1 and the length L2 can be obtained by obtaining the distance between the position E2 and the position E3. Further, when the fourth intervening portion does not exist, the length L1 can be obtained by obtaining the distance between the position E2 and the position E3 by the above method.

The length L1 is better from the viewpoint of alleviating the step. 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 the deformation mitigation is further improved. In order to shorten the length, it is preferably 1 mm or more, more preferably 10 mm or more. However, if the length L1 is too long, it becomes difficult to form the first convex filling portion upward due to processing, and the first filling portion may have wavy thickness unevenness. Therefore, the length L1 The upper limit is preferably 100 mm or less from the viewpoint of easily obtaining the upwardly convex first filling portion 14 and suppressing wavy thickness unevenness.

The above (length L1 + length L2) / thickness T2 and length L1 / thickness T2 can roughly represent the shape of the first filling portion 14, but more appropriately convex upward in the first filling portion 14. In order to express such a shape, it is preferable to use the area of the first filling portion 14 on the plane including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11. Specifically, when the fourth intervening portion 18 is present as shown in FIG. 4, the longitudinal direction DR2 and the winding core 11 of the sheet 12 with respect to the thickness T2 at the position in contact with the tip surface 12A1 of the first filling portion 14. Area S1 (see FIG. 6) and the winding core 11 of the region R1 sandwiched between the outer peripheral surface 11A of the winding core 11 and the surface 14B of the first filling portion 14 in the plane including the radial DR3 (see FIG. 4). The total ratio ((area S1 + area S2) / thickness T2) of the area S2 (see FIG. 6) of the region R2 sandwiched between the outer peripheral surface 11A and the surface 18A of the fourth intervening portion 18 is 3.0 or more. Is preferable. The area S1 of the region R1 in FIG. 6 represents the cross-sectional area of the first filling portion 14. Further, the area S2 of the region R2 in FIG. 6 represents the total of the cross-sectional area of the fourth intervening portion 18, the cross-sectional area of the sheet 12 in the region R2, and the cross-sectional area of the fixing member 17 in the region R2. Note that FIG. 6 shows a state in which the sheet 12 on the first filling portion 14 and the fourth interposing portion 18 is peeled off to expose the first filling portion 14 and the fourth interposing portion 18. When the fourth intervening portion 18 is not present, the winding in the plane (the plane represented by FIG. 7) including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11 with respect to the thickness T2 of the first filling portion 14. The ratio of the area S1 of the region R1 sandwiched between the outer peripheral surface 11A of the core 11 and the surface 14B of the first filling portion 14 (area S1 / thickness T2) is preferably 3.0 or more. When these ratios are 3.0 or more, the total area S1 and the area S2 or the area S1 is large with respect to the thickness T2, so that the sheet 12 can be effectively lifted by the first filling portion 14, which is described above. The step can be further relaxed. 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 from the viewpoint of further alleviating the step. Further, the upper limit of these ratios is not particularly limited, but may be, for example, 50.0 or less, further 17.0 or less.

The sum of the areas S1 and the area S2 and the area S1 are the products of the thickness t at each measurement point MP and the width d between the measurement points MP in the region from the position E2 to the position E3 as shown in FIG. It can be calculated by calculating and summing it. The width between the measurement points can be obtained from the sampling period, the rotation speed of the winding core, and the outer diameter of the winding core. Specifically, the width between the measurement points can be obtained by the following mathematical formula (3). In formula (3), d (μm) is the width between measurement points, ΔT (s) is the sampling period, r (rpm) is the rotation speed of the winding core, and φ (mm) is the winding core. It is the outer diameter, and π is the pi.
d = ΔT × (r / 60) × φ × π × 1000… (3)

As mentioned above, the winding core is often reused after the roll body is used, so reworkability is required. Therefore, it is preferable that the first filling portion 14 is not adhered to the winding core 11. If the reworkability is good, the winding core can be reused after the roll body is used. The "state in which the winding core can be reused" in the present specification means a state in which the entire outer peripheral surface of the winding core is visually observed and there is no deposit that causes a step. The method of removal depends on the filling material used for the first filling portion. When the crosslink density is high and hard as in the hard coat layer used for display devices, the thinner the edge thickness T1, the easier it may be removed. On the other hand, when the crosslink density is not so high and the rubber has elasticity, the thicker the edge thickness T1, the easier it may be removed. In either case, it is sufficient that the deposits that cause the step do not remain by visual observation. Further, "adhesion" in the present specification is a concept including adhesion. Since the first filling portion 14 is not adhered to the winding core 11, the first filling portion 14 can be easily peeled off, and thus has good reworkability. The first filling portion 14 is formed by cleaning or wiping the winding core 11 or at the end of the first filling portion 14 with a blade-shaped object so as not to damage the winding core 11, and the winding core 14 is slowly wound with a finger or the like. It is more preferable that it can be peeled off from 11. Further, it is more preferable that the first filling portion 14 does not substantially contain an adhesive component.

When a 90 ° peeling test is performed in which the constituent material of the first filling portion 14 is peeled perpendicularly to the outer peripheral surface 11A of the winding core 11, it may be peeled from the outer peripheral surface 11A of the winding core 11 with a tensile force of less than 2.0N. preferable. When the constituent material is peeled off with a tensile force of less than 2.0 N, the first filling portion 14 can be easily peeled off, so that it has good reworkability and has a tensile force of 0.3 N or less. When the constituent material is peeled off, the first filling portion 14 can be peeled off more easily, so that it has excellent reworkability.

The 90 ° peeling test can be performed using a sample and a spring type tension gauge (manufactured by Oba Keiki Seisakusho Co., Ltd.). Specifically, first, a mold larger than the size of the sample is prepared, and this mold is arranged on the outer peripheral surface 11A of the winding core 11. Then, the coating material for forming the first filling portion 14 is poured into this mold, and if necessary, it is cured to obtain a material layer. Then, the material layer is removed from the mold, and the material layer is cut out to a size of 20 mm × 100 mm by a cutting machine or the like to obtain 10 samples provided on the outer peripheral surface 11A of the winding core 11. Then, one end of the sample is held by a spring type tension gauge, and the tensile force is measured in an environment where the temperature is 25 ° C. and the relative humidity is 30% or more and 70% or less, and the winding core 11 is perpendicular to the outer peripheral surface 11A. The one end is pulled up to peel the sample at a peeling speed of 10 mm / sec. Then, among the 10 samples subjected to the 90 ° peeling test, the arithmetic mean value of the tensile force of 8 samples excluding the sample having the maximum tensile force and the sample having the minimum tensile force was calculated as the tensile force of the above constituent materials. And.

The tensile strength of the constituent material of the first filling portion 14 is preferably 3.0 MPa or more. When the tensile strength of the constituent material is 3.0 MPa or more, the first filled portion 14 is not easily torn when the first filled portion 14 is peeled off, and good reworkability can be obtained. The lower limit of the tensile strength of the constituent material is more preferably 3.2 MPa or more or 3.4 MPa or more from the viewpoint of obtaining excellent reworkability. Further, if the tensile strength of the constituent material is too large, the cushioning property of the first filling portion is inferior. Therefore, the upper limit of the tensile strength of the constituent material is 16.0 MPa or less, 8 in order to obtain good cushioning property. It is preferably 0.0 MPa or less, or 5.5 MPa or less.

The tensile strength of the above constituent materials can be measured using a sample and a Tencilon universal testing machine (product name "RTC-1310A", manufactured by A & D Co., Ltd.) in accordance with JIS K6251: 2017. .. Specifically, first, a mold larger than the size of the sample is prepared, and this mold is arranged on the outer peripheral surface 11A of the winding core 11. Then, the coating material for forming the first filling portion 14 is poured into this mold, and if necessary, it is cured to obtain a material layer. After that, the material layer is removed from the mold, and a punching blade (for example, a tension No. 2 dumbbell-shaped punching blade manufactured by Polymer Instruments Co., Ltd.) is used to make the size of the dumbbell-shaped No. 2 described in JIS K6251: 2017. Punch the material layer to obtain 10 samples. The sample is then held in an environment of 25 ° C. for 24 hours. Then, both ends of the sample in the longitudinal direction are gripped by the pair of grippers of the Tencilon universal testing machine, and the initial grip distance between the grippers is 20 mm and the tensile speed is 100 mm in an environment of a temperature of 25 ° C. and a relative humidity of 30% to 70%. Perform a tensile test under the condition of / minute and measure the tensile strength of the sample. The arithmetic mean value of the tensile strengths of 8 samples excluding the maximum value and the minimum value among the 10 samples is defined as the tensile strength of the constituent material.

The elongation of the constituent material of the first filling portion 14 during cutting is preferably 200% or more. When the elongation at the time of cutting of the constituent material is 200% or more, the first filling portion 14 is easily stretched, so that the first filling portion 14 is not easily torn when the first filling portion 14 is peeled off, and good reworkability is obtained. be able to. The lower limit of the elongation during cutting of the constituent material is more preferably 250% or more, 300% or more, or 350% or more from the viewpoint of obtaining excellent reworkability. Further, the upper limit of the elongation at the time of cutting of the constituent material may be 850% or less, 600% or less, or 500% or less. The elongation during cutting of the above constituent materials is measured by measuring the tensile strength using a sample and a Tencilon universal testing machine (product name "RTC-1310A", manufactured by A & D Co., Ltd.) in accordance with JIS K6251: 2017. It can be measured in the same manner as the method.

The tear strength of the constituent material of the first filling portion 14 is preferably 1.0 N / mm or more. When the tear strength of the constituent material is 1.0 N / mm or more, the first filled portion 14 is less likely to be torn when the first filled portion 14 is peeled off, and good reworkability can be obtained. The lower limit of the tear strength of the constituent material is 2.0 N / mm or more, 4.0 N / mm or more, 6.0 N / mm or more, 8.0 N / mm or more, or 10 N from the viewpoint of obtaining excellent reworkability. It is more preferably / mm or more. Further, the upper limit of the tear strength of the constituent material may be 35 N / mm or less, 30 N / mm or less, or 25 N / mm or less. The tear strength of the above constituent materials can be measured using a sample and a Tencilon universal testing machine (product name "RTC-1310A", manufactured by A & D Co., Ltd.) in accordance with JIS K6252: 2007. .. The sample shall be prepared by the method described in the column of tensile strength.

The hardness of the constituent material of the first filling portion 14 measured by the durometer type A is preferably 95 ° or less. The pressure at the time of winding is always applied to the tip of the first filling portion, and the pressure may be further applied due to aging and environmental changes (temperature, humidity and / or pressure). In order to suppress the step caused by the tip of the first filling, it is effective that the tip of the first filling is thin, but the hardness of the constituent material measured by the durometer type A is 95 ° or less. By using a soft resin such as the above, the first filling portion is deformed by the pressure at the time of winding the sheet, and the step caused by the tip portion of the first filling portion can be suppressed. The upper limit of the hardness is more preferably 95 ° or less, 80 ° or less, 70 ° or less, or 50 ° or less. On the other hand, when the difference in hardness between the sheet and the first filling portion is large, such as when the sheet is hard and the first filling portion is soft, or when the fourth intervening portion does not exist, the pressure at the time of winding the sheet Therefore, only the first filling portion is compressed, the step caused by the winding start end portion is not sufficiently relaxed, and the sheet may be slightly deformed. Therefore, the lower limit of the hardness is preferably 10 ° or more, 15 ° or more, 20 ° or more, or 25 ° or more.

Hardness measurement with durometer type A is performed in accordance with JIS K6253: 1997. Specifically, first, a mold larger than the size of the sample is prepared, and this mold is arranged on the outer peripheral surface 11A of the winding core 11. Then, the coating material for forming the first filling portion 14 is poured into this mold, and if necessary, it is cured to obtain a material layer. Then, the material layer is removed from the mold, and the material layer is cut out by a cutting machine or the like to obtain 10 samples having a size of 100 mm × 100 mm and a thickness of 10 mm. Then, using a durometer type A (product name "GS-719N (TYPEA)", manufactured by TECLOCK Co., Ltd.), the hardness is measured in an environment of a temperature of 25 ° C. and a relative humidity of 30% to 70%. The arithmetic mean value of the hardness of 8 samples excluding the maximum value and the minimum value among the 10 samples is defined as the hardness of the constituent material.

When the sheet is wound, the coating material flows so as to alleviate the step caused by the winding start end, but when the coating material is a curable polymer composition, if it shrinks during the subsequent curing, In particular, when the fourth intervening portion does not exist, the step is not sufficiently relaxed at the first filling portion, and the sheet may be slightly deformed. Therefore, the linear shrinkage rate of the constituent material of the first filling portion 14 is preferably 1.5% or less. When the linear shrinkage rate of the constituent material is 1.5% or less, the first filling portion having excellent dimensional stability can be formed, so that the step can be sufficiently relaxed at the first filling portion. The upper limit of the linear shrinkage rate of the first filling portion 14 is more preferably 1.3% or less, 1.0% or less, 0.7% or less from the viewpoint of more sufficiently relaxing the step. Further, the lower limit of the heat shrinkage rate may be 0% or more.

The linear shrinkage rate of the above constituent materials can be measured as follows. First, a mold having a thickness of 2 mm and a size of 130 mm square or more is prepared, and a coating material for forming the first filling portion 14 is poured into the mold and cured to obtain a sample (molded product). After the sample is completely cured, the size of the sample is measured and compared with the inside size of the mold to obtain the linear shrinkage ratio based on JIS K6249: 2003. The arithmetic mean value of the linear shrinkage rate of 8 samples excluding the maximum value and the minimum value among the 10 samples is defined as the linear shrinkage rate of the constituent material.

The first filling portion 14 can be formed by flowing or deforming the filling material. When the filling material exhibits fluidity, it does not necessarily have to always exhibit fluidity if it exhibits fluidity before winding the sheet or at the time of winding the sheet. Examples of the filling material include a coating material or a filling tape.

The coating material is a material that can be coated, and has fluidity at the time of coating or winding, for example. Examples of the coating material having fluidity include not only a liquid but also a material that changes from a liquid to a solid, a solid that has fluidity by heating or the like, or a curable material. When the coating material is a curable material, the first filling portion 14 is formed from a cured product of the curable material.

Examples of the coating material include curable polymer compositions, thermoplastic resins, oils, starches, adhesives, adhesives, sol and the like.

Examples of the curable polymer composition include a curable resin composition and a curable rubber composition. When a thermoplastic resin is used as the coating material, it is necessary to make it fluid by heating at the time of coating and winding.

The filling tape is a tape that becomes the first filling portion 14 by being filled in the first gap 13, and has a property of spreading by a capillary phenomenon under the pressure at the time of winding the sheet 12, or a gel tape. The filling tape is used by being attached to or in close contact with the outer peripheral surface 11A of the winding core 11.

As mentioned above, the first filling portion is required to have reworkability. Here, if the filling material (for example, a coating material) is a sealant material, the sealant material firmly adheres to the winding core, so that the reworkability is inferior. On the other hand, the molding material is premised on being removed from the mold, and therefore has excellent reworkability. Therefore, from the viewpoint of reworkability, a molding material is preferable as a filling material (for example, a coating material).

The shear viscosity of the filling material (for example, coating material) at 25 ° C. and a shear rate of 1 / s is preferably 500 Pa · s or less. For example, it is conceivable to spread the filling material while using a spatula or the like for the filling material coated on the winding core (for example, the coating material) to adjust the shape of the filling material before winding the sheet. When the filling material is spread by such a process, a great deal of labor is required. On the other hand, if the shear viscosity of the filling material is 500 Pa · s or less, the filling material can be spread into a desired shape by the pressure at the time of winding the sheet, so that a special step of spreading the filling material. Can be omitted. The shear viscosity is more preferably 200 Pa · s or less. The shear viscosity is preferably 300 Pa · s or less, 100 Pa · s or less, or 50 Pa · s or less from the viewpoint of easily spreading the filling material.

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

Further, if the shear viscosity is 15 Pa · s or more, and further 20 Pa · s or more, from the viewpoint of further suppressing the protrusion of the filling material, the filling material protrudes from between the winding core 11 and the sheet 12 at the time of coating. Is preferable because it can suppress. Further, the shear viscosity is preferably 60 Pa · s or more. When the shear viscosity is 60 Pa · s or more, the fluidity of the filling material is low, and it is possible to prevent the filling material from squeezing out from between the winding core and the sheet due to the pressure at the time of application and / or at the time of winding.

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

It is preferable that the filling material (for example, coating material) does not contain volatile components such as a solvent. Since the filling material does not contain a volatile component, the shape change such as cracks in the first filling portion 14 is small, and sheet marks are unlikely to occur.

(Coating material)
The coating material can be coated when the first filling portion is formed, but it is preferable that the coating material has low fluidity in the state of the roll body 10. In the present specification, "low fluidity in the state of the roll body" means that the coating material does not protrude from the roll body during transportation or production of the roll body. When forming the first filling portion 14 in the first gap 13, it is necessary that the coating material can be applied. However, if the coating material has high fluidity in the state of the roll body 10, it may occur during transportation. At the time of manufacturing or the like, the first filling portion may protrude and become dirty. On the other hand, if the coating material is a material that can be applied at the time of 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. At the same time, it is possible to suppress protrusion and dirt of the first filling portion 14. A curable polymer composition can be mentioned as a material having low fluidity in the state of the roll body 10, although it can be applied at the time of forming such a first filling portion.

When the coating material is a curable polymer composition, the coating material includes, for example, an ionizing radiation curable polymer composition (ionizing radiation curable resin composition or ionizing radiation curable rubber composition), a thermosetting polymer. Composition (thermosetting resin composition or thermosetting rubber composition), room temperature curable polymer composition (polymer composition that cures at room temperature of about 20 ° to 30 ° C) (room temperature curable resin composition) And room temperature curable rubber composition) and the like can be used.

Room temperature curable polymer compositions include, for example, two-component curable polymer compositions composed of a main agent and a curing agent, and one-component curable polymer compositions that are cured by moisture in the air. Since the portion of the first filling portion existing in the center of the sheet is in a substantially sealed state in a state where the sheet is wound, it is difficult for air to come into contact with this portion, and there is a possibility that the sheet will not be sufficiently cured. On the other hand, the two-component curable polymer composition can be cured only by time management because the reaction starts when the main agent and the curing agent are mixed. Further, the two-component curable polymer composition is preferable in that it is superior in storage stability to the one-component curable polymer composition.

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

Examples of the ionizing radiation curable polymer composition include an acrylic gel composition that forms an acrylic gel by irradiating with ionizing radiation. Acrylic gel compositions include, for example, ethyl (meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, 2-ethylhexyl ( Meta) acrylate, n-hexyl (meth) acrylate, n-amyl (meth) acrylate, i-amyl (meth) acrylate, octyl (meth) acrylate, i-octyl (meth) acrylate, i-myristyl (meth) acrylate, Includes lauryl (meth) acrylate, nonyl (meth) acrylate, i-nonyl (meth) acrylate, i-decyl (meth) acrylate, tridecyl (meth) acrylate, stearyl (meth) acrylate, i-stearyl (meth) acrylate and the like. .. As used herein, the term "(meth) acrylate" means to include both "acrylate" and "methacrylate".

Examples of the thermosetting polymer composition and the room temperature curable polymer composition include urethane resin compositions, epoxy resin compositions, and silicone compositions. 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 because they can easily alleviate the above-mentioned steps and deformations.

The "silicone gel cured product (silicone gel)" formed by curing the silicone gel composition in the present specification is a cured product containing organopolysiloxane as a main component and having a very low crosslink density, and is JIS K2220. : It means that the degree of needle insertion by 2013 (1/4 cone) is 10 to 150. This corresponds to a rubber hardness measurement by JIS K6249: 2003 in which the measured value (rubber hardness value) is 0, and the hardness is so low (that is, soft) that it does not show an effective rubber hardness value. In this respect, It is different from the so-called silicone rubber composition and the cured silicone rubber product (rubber-like elastic body).

Silicone rubber compositions include one-component curable silicone rubber compositions and two-component curable silicone rubber compositions. The one-component curable silicone rubber composition includes a condensation reaction curable rubber composition that cures at room temperature and an addition reaction rubber composition that cures by heating. Further, the two-component curable silicone rubber composition includes a condensation reaction curable rubber composition and an addition reaction rubber composition that cure at room temperature, and an addition reaction rubber composition that cures by heating. It is also possible to obtain an ionizing radiation curable rubber composition by modifying the silicone rubber composition with another resin. In the present invention, any curing method can be used, but among these, a two-component curable silicone rubber composition is preferable because it can be cured uniformly and has excellent storage stability.

Examples of the silicone rubber composition include RTV (Room Temperature Vulcanizing) silicone rubber compositions. The RTV silicone rubber composition has a smaller shrinkage rate and better dimensional stability than the ionizing radiation curable polymer composition, and has excellent fluidity before curing, so that the core 11 and the sheet 12 or the sheet It easily penetrates into the gap between the 12 and has low fluidity after curing. Further, since this RTV silicone rubber composition has deep curability, the curing reaction tends to proceed uniformly regardless of the thickness at the time of coating. In addition, since this composition is also excellent in releasability, it is easy to peel off the cured product so that it can be used again as a roll.

The RTV silicone rubber composition includes a condensation reaction curable RTV silicone rubber composition, an addition reaction curable RTV silicone rubber composition, and the like, depending on the curing reaction mechanism. In the present invention, either can be preferably used. The condensation reaction curable RTV silicone rubber composition is preferable in that there is no curing inhibition, and the addition reaction curable RTV silicone rubber composition is preferably in that the curing shrinkage rate is even smaller. In the present invention, a material having a larger curing shrinkage tends to have a larger thickness of the coating material required for alleviating the step. Therefore, especially in a thin sheet (for example, the thickness of the sheet 12 is 3 μm to 45 μm), the addition reaction A curable RTV silicone rubber composition is preferably used.

The RTV silicone rubber composition is preferably a liquid silicone rubber LSR (Liquid Silicone Rubber) because it does not require a special processing device.

The various compositions described above may contain a functional component in order to exert a desired function. For example, since the silicone rubber composition is generally an electrical insulator, it may be charged by contact with the winding core 11, the sheet 12, or other substances. In that case, the silicone rubber composition may contain a conductive filler. By doing so, it is possible to prevent foreign matter such as dust from being mixed in, so that it is possible to suppress the cause of the above-mentioned step.

Examples of the conductive filler mixed in the silicone rubber composition include carbon black (acetylene black and Ketjen black), silver powder, gold-plated silica and graphite, and conductive zinc oxide. Further, in recent years, an ion conductive silicone rubber has also been developed, and this ion conductive silicone rubber can also be used.

Any component can be added to the silicone gel composition as long as the object of the present invention is not impaired. Examples of the optional component include a reaction inhibitor, an inorganic filler, an organopolysiloxane containing no silicon atom-bonded hydrogen atom and a silicon atom-bonded alkenyl group, a heat resistance imparting agent, a flame retardant imparting agent, and a thixo property imparting agent. Examples include pigments and dyes.

The reaction inhibitor is a component for suppressing the reaction of the above composition, and specific examples thereof include reaction inhibitors such as acetylene-based, amine-based, carboxylic acid ester-based, and phosphite ester-based. Be done.

Examples of the inorganic filler include fumed silica, crystalline silica, precipitated silica, hollow filler, silsesquioxane, fumed titanium dioxide, magnesium oxide, zinc oxide, iron oxide, aluminum hydroxide, magnesium carbonate, and calcium carbonate. , Zinc oxide, layered mica, carbon black, diatomaceous earth, glass fiber and other inorganic fillers; these fillers are made of organic silicon compounds such as organoalkoxysilane compounds, organochlorosilane compounds, organosilazane compounds and low molecular weight siloxane compounds. Examples thereof include fillers that have been surface-hydrophobicized. Further, silicone rubber powder, silicone resin powder and the like may be blended.

When the coating material is an adhesive, the adhesive may be a denture stabilizer. The denture stabilizer can be roughly classified into a denture adhesive and a home reliner, and as the adhesive, a denture adhesive can be used among the denture stabilizers. When the pressure-sensitive adhesive is classified into, for example, a powder type, a cream type, or a tape type like a denture pressure-sensitive adhesive, the pressure-sensitive adhesive used as a coating material is a powder-type or cream-type pressure-sensitive adhesive.

The pressure-sensitive adhesive itself may be sticky, or may be sticky due to moisture. The powder type pressure-sensitive adhesive, for example, absorbs water when it comes into contact with water and exhibits stickiness. The cream-type pressure-sensitive adhesive is, for example, a sticky powder component creamed with an ointment base, and exhibits stickiness.

The pressure-sensitive adhesive preferably contains a water-soluble polymer. The water-soluble polymer is not particularly limited, and is, for example, alginate, alginates (for example, sodium alginate, potassium alginate, ammonium alginate, alginate ester, etc.), and natural polymer compounds (for example, arabic gum, tragant gum, locust bean gum). , Xanthan gum, guar gum, agar, gelatin, karaya gum, carrageenan, etc.), Cellulosic polymers (eg, methyl cellulose, sodium carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl cellulose, etc.), polyethylene glycol, polyvinylpyrrolidone, polyvinyl alcohol, Examples thereof include methyl vinyl ether, carboxyvinyl polymer, copolymer of acrylamide and acrylic acid, sodium polyacrylate, polyethylene oxide and the like. These water-soluble polymers may be used alone or in combination of two or more.

Among the above cellulosic polymers, sodium carboxymethyl cellulose is preferable. Sodium carboxymethyl cellulose is a sodium salt of polyvalent carboxymethyl ether of cellulose, also known as carmellose sodium. Sodium carboxymethyl cellulose is a powder that, when moistened, hydrates and exhibits adhesiveness or elasticity, thus imparting additional adhesiveness to the adhesive.

As long as the pressure-sensitive adhesive as a coating material can be applied, it is further oil-based base, aqueous base, powder base, gum base, excipient, emulsifier, wetting agent, pH adjuster, viscosity adjuster, plasticizer. Agents, pigments, etc. can be blended. Examples of these bases and additives include bases and additives that have been widely used in denture stabilizers.

For example, an oil-based base is used as a base when a pressure-sensitive adhesive is prepared in a paste-like form such as a cream type. Examples of the oil-based base include mineral oil components (for example, liquid paraffin, petrolatum, gelled hydrocarbons, etc.) usually used for non-aqueous adhesives (for example, cream type).

As cream type adhesives, for example, New Polygrip (registered trademark) S, New Polygrip (registered trademark) V, New Polygrip (registered trademark) additive-free, Polydent (registered trademark) NEO tooth stabilizer (all) Glaxo Smith Kline Consumer Healthcare Japan Co., Ltd.), Tough Grip (registered trademark) cream-free (Kobayashi Pharmaceutical Co., Ltd.), Collect (registered trademark) cream (Shionogi Pharmaceutical Co., Ltd.) can be used. it can.

When the coating material is an adhesive, the adhesive may be a denture stabilizer home reliner (cushion type). The adhesive agent enhances the adhesive force by improving the edge closing effect. Such an adhesive may contain, for example, a water-insoluble polymer. The water-insoluble polymer is not particularly limited, and examples thereof include polyvinyl-based resins such as vinyl acetate-based resins.

As adhesives, for example, Polydent (registered trademark) cushion (GlaxoSmithKline Consumer Healthcare Japan), Tough Grip (registered trademark) cushion transparent, Tough grip (registered trademark) cushion pink, Soft tough grip ( Registered trademark) (all manufactured by Kobayashi Pharmaceutical Co., Ltd.), Cushion Collect (registered trademark) EZ (manufactured by Shionogi Pharmaceutical Co., Ltd.), New Riodent White, New Riodent Pink (all manufactured by Lion Corporation), etc. can be used. ..

When the coating material is a sol, examples of the sol include silica sol, alumina sol, and metal oxide sol such as zirconia sol, titanium oxide sol, cerium oxide sol, tin oxide sol, and niobium oxide sol.

In order to allow the coating material to flow to the vicinity of P1 at a position (separation position) away from the outer peripheral surface 11A of the winding core 11 while the coating material does not flow too much, the viscosity at the time of coating the coating material It is desirable to adjust as appropriate.

The coating material is applied linearly, and the coating amount per unit width of the coating material is preferably an amount such that the thicknesses T1 to T3 in the above range of the first filling portion 14 can be obtained. Specifically, for example, the lower limit of the coating amount per unit width of the coating material is preferably 0.2 cm ³ / m or more. If the above-mentioned coating amount of the coating material is too small, for example, when the coating material is applied with a syringe, air is bitten and it becomes difficult to discharge the coating material from the syringe, or when the sheet is run and applied, the coating is cut off. However, if the coating amount is 0.2 cm ³ / m or more, such a situation can be suppressed. Further, the upper limit of the coating amount per unit width of the coating material is preferably 3.5 cm ³ / m or less. If the coating amount of the coating material is too large, the coating material may hang down due to its own weight or a new step may be generated. However, if the coating amount is 3.5 cm ³ / m or less, this is the case. Can be suppressed. The lower limit of the coating amount is more preferably 0.3 cm ³ / m or more, and the upper limit of the coating amount is 2.0 cm ³ / m or less or 1.5 cm ³ / m or less. preferable.

(Filling tape)
Examples of the constituent material of the filling tape include the pressure-sensitive adhesive, the adhesive, the gel and the like described in the above section of the coating material. Examples of the gel include a silicone gel formed from the silicone gel composition, an acrylic gel formed from the acrylic gel composition, a polyolefin gel, a polyurethane gel, a butadiene gel, an isoprene gel, and a butyl gel. Examples thereof include styrene butadiene gels, ethylene vinyl acetate copolymer gels, ethylene-propylene-diene ternary copolymer gels, and fluorine gels. As the filling tape, for example, Touch Collect (registered trademark) II (manufactured by Shionogi Pharmaceutical Co., Ltd.) or αGEL (registered trademark) (manufactured by Taica Corporation) can be used.

The length of the filling tape is preferably equal to or greater than the width of the effective region in the width direction DR1 of the winding core 11. By setting the length of the filling tape to such a length, the first filling portion can be formed over the entire width of the effective region, whereby the winding start end portion 12A of the sheet 12 can be formed over the entire width of the effective region. It is possible to alleviate the step caused by. From the viewpoint of suppressing the filling tape from sticking out when the sheet 12 is wound, the filling tape is separated from both ends in the lateral direction of the sheet 12 inward by 1 mm or more, 10 mm or more, or 30 mm or more, respectively, in the width direction DR1 of the winding core 11. It is preferable that they are arranged in such a manner. The length of the filling tape means the length of the DR1 in the width direction of the filling tape.

The width of the filling tape is preferably 5 mm or more. By setting the width of the filling tape to such a width, it is possible to more effectively alleviate the step caused by the winding start end portion 12A of the sheet 12. The lower limit of the width of the filling tape is more preferably 6 mm or more, 7 mm or more, or 8 mm or more. The upper limit of the width of the filling tape is preferably less than the outer peripheral length of the winding core 11 from the viewpoint of suppressing the overlap of the filling tapes. The width of the filling tape means the length of the DR2 in the longitudinal direction of the sheet 12 in the filling tape.

The thickness of the filling tape is preferably equal to or greater than the height of the upper surface 12A2 of the winding start end 12A. By setting the thickness of the filling tape to such a thickness, the filling tape can be spread over a wide range when the sheet 12 is wound, so that the step caused by the winding start end portion 12A of the sheet 12 can be more effectively relaxed. Can be done. The specific thickness of the filling tape is, for example, 52 μm or more and 220 μm or less when the thickness of the sheet 12 is 50 μm or more and 200 μm or less, and 50 when the thickness of the sheet 12 is 3 μm or more and less than 50 μm. It is preferably 5.5 μm or more and 100 μm or less.

<Second filling part>
The second filling portion 16 is filled in the second gap 15. That is, the second filling portion 16 is in contact with 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.

Since the physical characteristics such as the tensile strength of the constituent material of the second filling portion 16 are the same as the physical characteristics such as the tensile strength of the constituent material of the first filling portion 14, the description thereof will be omitted here.

The second filling portion 16 can be formed by applying or deforming a filling material. Examples of the filling material include a coating material and a filling tape. Since the filling material, the coating material and the filling tape are the same as the filling material, the coating material and the filling tape described in the first filling portion 14, the description thereof will be omitted. The constituent material of the second filling portion may be the same as the constituent material of the first filling portion 14, but may be different.

It is preferable that the thickness of the second filling portion 16 gradually decreases toward the vicinity of the arrival position P2 where the sheet 12 on the first lap from the first end surface 17A reaches the outer peripheral surface 11A of the winding core 11. By changing the thickness of the second filling portion 16 in this way, it is possible to suppress a sudden change in the height direction of the sheet 12, so that the step caused by the fixing member 17 can be alleviated.

Since both end portions 12G extending in the longitudinal direction DR2 of the sheet 12 are not used as a product, the length of the second filling portion 16 in the width direction DR1 of the winding core 11 is for commercialization in the roll body 10. As long as it is equal to or larger than the effective area, it may be smaller than the width W2 of the sheet 12.

<Fourth intervention>
Since the first filling portion tends to be softer than the sheet, if the height at the position of contacting the tip surface of the winding start end portion in the first filling portion is the same height as the upper surface of the winding start end portion, the sheet When winding, there is a possibility that a step may occur at the corner between the tip surface and the upper surface of the winding start end. On the other hand, when the fourth intervening portion 18 is formed, the fourth intervening portion 18 can absorb the difference in hardness between the first filling portion 14 and the sheet 12, so that the tip of the winding start end portion 12A The step between the corners of the surface 12A1 and the upper surface 12A2 can be reduced. Further, the presence of the fourth intervening portion 18 can suppress the concentration of stress on the stepped portion caused by the winding start end portion 12A, and the deformation of the sheet 12 after the third lap can be moderated. Therefore, this step can be alleviated.

The fourth intervening portion 18 preferably contains a coloring material or a light emitting material, similarly to the first filling portion 14. Since the fourth intervening portion 18 contains a coloring material or a light emitting material, it is easy to visually recognize when the fourth intervening portion 18 protrudes from the roll body 10. In addition, it becomes easy to confirm the existence of the fourth intervening portion 18. Since the coloring material and the light emitting material contained in the fourth intervening portion 18 are the same as the coloring material and the light emitting material described in the column of the first filling portion 14, the description thereof will be omitted.

When the sheet 12 is transparent and the fourth intervening portion 18 is colored, it can be easily visually confirmed whether or not the fourth intervening portion 18 is present. Specifically, first, the sheet 12 is fed out from the roll body 10 until the surface becomes the sheet 12 on the second lap. Then, in the roll body 10 having the sheet 12 on the second lap as the surface, the vicinity of the winding start end portion 12A is visually observed, and whether or not there is a colored portion on the winding start end portion 12A is observed. If there is a colored portion on the winding start end portion 12A, it can be determined that the fourth intervening portion 18 is present, and if there is no colored portion, the fourth intervening portion 18 is present. It can be judged not to.

Even when the sheet 12 is transparent and the fourth interposition portion 18 contains a light emitting material, whether or not the fourth interposition portion 18 is present can be easily visually confirmed in the same manner as described above. .. When the light emitting material is a material that emits light by irradiation with light such as ultraviolet rays or visible light, the light is irradiated to confirm whether or not the fourth intervening portion 18 is present.

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 fourth interposition portion 18 is preferably 2 μm or more and 110 μm or less. When the thickness T3 of the fourth intervening portion 18 is within this range, the deformation relaxation length can be shortened while avoiding an adverse effect on the winding of the sheet 12. When the thickness T3 of the fourth intervening portion 18 exceeds 110 μm, the deformation relaxation length can be shortened, but the winding of the sheet 12 may be adversely affected.

When the thickness of the sheet 12 is 3 μm or more and less than 50 μm, and further 40 μm or less, the sheet 12 is more easily deformed due to the step caused by the winding start end portion 12A than when the thickness of the sheet 12 is thick. Therefore, the thickness T3 of the fourth interposition portion 18 is preferably 0.5 μm or more and 50 μm or less. When the thickness T3 of the fourth intervening portion 18 is within this range, the deformation relaxation length can be shortened while avoiding the adverse effect of winding the sheet 12.

The thickness T3 of the fourth intervening portion 18 is the maximum thickness of the fourth intervening portion 18. The thickness T3 of the fourth interposition portion 18 shall be measured as follows. First, this portion is collected and fixed so that the portion including the winding start end portion 12A, the fourth intervening portion 18, and the sheet 12 on the second lap is not crushed. Then, the cross section of this fixed portion is polished, and the thickness T3 of the fourth interposition portion 18 is measured with a stereomicroscope (for example, product name "Digital Microscope VHX-7000", manufactured by KEYENCE CORPORATION).

The fourth interposition portion 18 can be formed by applying or deforming a filling material. Examples of the filling material include a coating material and a filling tape. Since the filling material, the coating material and the filling tape are the same as the filling material, the coating material and the filling tape described in the first filling portion 14, the description thereof will be omitted. The constituent material of the fourth interposition portion 18 may be the same as the constituent material of the first filling portion 14, but may be different.

<< Other rolls >>
In the roll body 10, the tip end surface 12A1 of the winding start end portion 12A of the sheet 12 and the second end surface 17B of the fixing member 17 are substantially aligned in a cross section along the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11. However, as in the roll body 20 shown in FIG. 12, the tip end surface 12A1 of the winding start end portion 12A of the sheet 12 may protrude from the second end surface 17B of the fixing member 17. In this case, the second gap 15 is filled with the second filling portion 16, and the second filling portion 16 is located between the outer peripheral surface 11A of the winding core 11 and the back surface 12C of the sheet 12 on the first lap, and is located on the second end surface 17B side. The third filling portion 22 may be filled in the three gaps 21.

<Third gap>
The third gap 21 is a gap in contact with the second end surface 17B of the fixing member 17. Specifically, the third gap 21 shown in FIG. 12 is a gap surrounded by the outer peripheral surface 11A of the winding core 11, the back surface 12C of the sheet 12 on the first circumference, and the second end surface 17B of the fixing member 17. is there.

<Third filling part>
Since the third filling portion 22 is the same as the second filling portion 16 except that the third gap 21 is filled, the description thereof will be omitted here.

In the roll body 10, the second filling portion 16 is filled in the second gap 15, but from the viewpoint of alleviating the step caused by the winding start end portion 12A of the sheet 12, the first filling portion 13 is filled with the first filling portion 13. Since it is sufficient that 14 is filled, the second filling portion 16 does not have to be filled in the second gap 15 as in the roll body 30 shown in FIG. The roll body 30 has a hollow second gap 15.

In the roll body 10, the first filling portion 14 is filled in the first gap 13, but the second filling portion 16 is filled in the second gap 15 from the viewpoint of alleviating the step caused by the fixing member 17. Therefore, it is not necessary that the first filling portion 14 is not filled in the first gap 13 as in the roll body 40 shown in FIG. In the roll body 40, the first gap 13 is hollow.

The roll body 10 includes one fixing member 17, but may include two or more fixing members as shown in FIG. In the roll body 50 shown in FIG. 15, in addition to the fixing member 17, the fixing member 51 is provided on the first end surface 17A side of the fixing member 17. In the roll body 50 shown in FIG. 15, since the tip end surface 12A1 of the winding start end portion 12A of the sheet 12 protrudes from the second end surface 17B of the fixing member 17, the step caused by the fixing member 17 is suppressed. Therefore, it is preferable that the second gap 15 is filled with the second filling portion 16 and the third gap 21 is filled with the third filling portion 22. Similarly, in the roll body 50 shown in FIG. 15, in order to suppress a step caused by the fixing member 51, a second gap 52 on the first end surface 51A side of the fixing member 51, which will be described later, is filled with a second. It is preferable that the filling portion 53 is filled, and the third filling portion 55 on the second end surface 51B side of the fixing member 51, which will be described later, is filled with the third filling portion 55.

<Fixing member>
The fixing member 51 has a second end surface 51B opposite to the first end surface 51A. Both the first end surface 51A and the second end surface 51B extend in the width direction DR1 of the winding core 11. Since the fixing member 51 is the same as the fixing member 17, the description thereof will be omitted here.

<Second gap>
The second gap 52 is a gap in contact with the first end surface 51A of the fixing member 51. Specifically, the second gap 52 shown in FIG. 15 is a gap surrounded by the outer peripheral surface 11A of the winding core 11, the back surface 12C of the sheet 12 on the first circumference, and the first end surface 51A of the fixing member 51. is there.

<Third gap>
The third gap 54 is a gap in contact with the second end surface 51B of the fixing member 51. Specifically, the third gap 54 shown in FIG. 15 is a gap surrounded by the outer peripheral surface 11A of the winding core 11, the back surface 12C of the sheet 12 on the first lap, and the second end surface 51B of the fixing member 51. is there.

<2nd filling part and 3rd filling part>
Since the second filling portion 53 is the same as the second filling portion 16 except that the second gap 52 is filled, the description thereof will be omitted here. The third filling portion 55 is the same as the second filling portion 16 except that the third gap 54 is filled, and thus the description thereof will be omitted here.

Although the roll body 10 includes the fixing member 17, it does not have to be provided with the fixing member 17 as in the roll body 60 shown in FIG.

12, FIG. 13, FIG. 15, and FIG. 16 do not show the length L1, the length L2, the thickness T2, the thickness T3, the area S1, and the area S2, but the

roll bodies

20, 30, 50, and 60 show the

roll bodies

20, 30, 50, and 60. , Length L1, Length L2, Thickness T2, Thickness T3, (Length L1 + L2) / Thickness T2, (Area S1 + S2) / Thickness T2 are the same as in the case of the roll body 10.

The

roll bodies

20, 30, 50, and 60 all include the fourth intervening portion 18, but the

roll bodies

20, 30, 50, and 60 do not have to include the fourth intervening portion. In this case, the length L1 / thickness T2 and the area S1 / thickness T2 are the same as in the case of the roll body 10 shown in FIG.

In FIG. 13, all the surfaces of the fixing member 17 are in close contact with the winding start end portion 12A, but similarly to the roll body 10 shown in FIG. 8, there is a position between the winding start end portion 12A and the fixing member 17. 1 The filling portion 14 may be inserted.

<< Manufacturing method of roll body >>
The roll body 10 can be manufactured, for example, by the following method. First, as shown in FIG. 17A, the fixing member 17 is arranged on the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11.

After arranging the fixing member 17, the coating material 201 is 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. 17B by using a coating device such as a dispenser or a syringe. , 202 is applied. The coating material 201 is applied so as to come into contact with the second end surface 17B of the fixing member 17, and the coating material 202 is applied so as to come into contact with the first end surface 17A of the fixing member 17. In this case, for example, the

coating materials

201 and 202 may be coated at the same time using two coating devices.

In the above, the coating material 201 is applied so as to be in contact with the second end surface 17B, and the coating material 202 is applied so as to be in contact with the first end surface 17A, but the coating material has high wettability and is applied. When the viscosity of the material is low, when it is applied so as to come into contact with the second end face or the first end face, the coated material impregnates between the winding start end and the fixing member, and the winding start end and the sheet It may get wet and spread between the back surfaces. Although it can be made into a preferable state by controlling the coating material, if there is extra impregnation or wet spread, it will be cured at an uncontrollable position, and as a result, a new step may be generated. In addition, when the viscosity of the filling material is high (for example, a tape-like material) or the wettability of the coating material is low, when the filling material or the coating material is placed, the filling material or the coating material is cured in a state where it is wet and spreads only in the vicinity of the placement. Since there is a high possibility that if the material is not sufficiently wetted and spread by the winding in the subsequent process, many materials will be cured in a state where the vicinity of the winding start end is thick, and the step may be rather large. Therefore, the coating material 201 is preferably applied so as to be close to the second end surface 17B of the fixing member 17, and the coating material 202 may be applied so as to be close to the first end surface 17A of the fixing member 17. preferable. As used herein, "proximity" means a position that is clearly separated from the winding start end and the fixing member. For example, even if the coating material is a low-viscosity material, the separation distance from the winding start end and the fixing member is preferably 0.3 mm or more. This separation distance is preferably 0.5 mm or more, and preferably 1 mm or more from the viewpoint of maximum stability. If this separation distance is too large, it becomes difficult to obtain the effect of alleviating the step. Therefore, it is preferable to adjust the distance within the range in which the first filling portion 14 as shown in FIG. 3 can be completed. For example, the upper limit of this separation distance is preferably 10 mm or less, 7 mm or less, and more preferably 5 mm or less. If this separation distance exceeds 10 mm, the coating material may flow down before winding the sheet, although it depends on the diameter of the winding core, in addition to the possibility that the first gap is not filled. When the viscosity of the coating material is low, the coating amount may be increased. The separation distance is obtained by measuring 10 points and calculating the arithmetic mean value of the separation distances at 8 points excluding the maximum value and the minimum value among the measured 10 points.

When the viscosity of the coating material is high, the coating material is difficult to spread. Therefore, it is preferable that the separation distance is short. When the viscosity of the coating material is low, if the separation distance is too small, the coating material is placed on the fixing member. If the separation distance is too large, it may not be sufficiently filled in the target gap because it spreads in another direction. Therefore, the separation distance is neither too small nor too large. Is preferable.

In the above, after the fixing member 17 is arranged on the outer peripheral surface 11A of the winding core 11, the

coating materials

201 and 202 are simultaneously applied to both sides of the fixing member 17, but the following manufacturing methods (1) to (3) have been applied. The

coating materials

201 and 202 may be coated and the fixing member 17 may be arranged in such an order. Among these, the following production method (2) is preferable. The same applies to the

coating materials

204 and 205 described later.

In the manufacturing method (1), after the fixing member 17 is arranged on the outer peripheral surface 11A of the winding core 11, the coating material 201 is applied to the second end surface 17B side of the fixing member 17 so as to have the above-mentioned separation distance, and then the coating material 201 is applied. This is a method of applying the coating material 202 to the first end surface 17A side of the fixing member 17 so as to have the above-mentioned separation distance.

In the manufacturing method (2), after the coating material 201 is applied to the outer peripheral surface 11A of the winding core 11, the fixing member 17 is arranged so that the distance from the coating material 201 is the above-mentioned separation distance, and then from the fixing member 17. This is a method of applying the coating material 202 on the side of the fixing member 17 opposite to the coating material 201 so that the distance between the two is the above-mentioned separation distance. By coating the

coating materials

201 and 202 and arranging the fixing members 17 in such an order, the

coating materials

201 and 202 can be stably arranged with a separation distance, and the

excess coating materials

201 and 202 and the like are coated on the fixing members 17. Since it can be suppressed, it is possible to suppress the occurrence of a new step on the fixing member 17.

The manufacturing method (3) is a method in which the

coating materials

201 and 202 are applied to the outer peripheral surface 11A of the winding core 11 at predetermined intervals, and then the fixing member 17 is arranged between the

coating materials

201 and 202.

When the first filling portion 14 is formed but the second filling portion 16 is not formed, the coating material 201 is first applied, and then the fixing member is set so that the distance from the coating material 201 is the above-mentioned separation distance. When 17 is arranged and the second filling portion 16 is formed, but the first filling portion 14 is not formed, the coating material 202 is first applied, and then the distance from the coating material 202 is the above-mentioned separation distance. It is preferable to arrange the fixing member 17 so as to be.

It is preferable that the

coating materials

201 and 202 are applied to the width of the effective region or more in the width direction DR1 of the winding core 11. By coating the

coating materials

201 and 202 in this way, the coating materials 201 to 205 can be present in the first filling portion and the second filling portion over the entire width of the effective region, whereby the entire width of the effective region can be present. The step caused by the winding start end of the sheet 12 and the step caused by the fixing member 17 can be alleviated. From the viewpoint of suppressing the protrusion of the

coating materials

201 and 202 when the sheet 12 is wound, the

coating materials

201 and 202 are 1 mm or more and 10 mm, respectively, from both ends in the lateral direction of the sheet 12 in the width direction DR1 of the winding core 11. It is preferable to apply the coating so as to be separated by 30 mm or more.

The coating material 201 is preferably coated so that the width of the coating material 201 is 5 mm or more, 10 mm or more, or 30 mm or more. By applying the coating material 201 in this way, it is possible to more effectively alleviate the step caused by the winding start end portion 12A of the sheet 12. The upper limit of the width of the coating material 201 is preferably less than the outer peripheral length of the winding core 11 from the viewpoint of suppressing the overlap of the coating materials.

The coating material 202 is preferably coated so that the width of the coating material 202 is 0.5 mm or more, 1 mm or more, or 5 mm or more. By coating the coating material 202 in this way, it is possible to more effectively alleviate the step caused by the fixing member 17. The upper limit of the width of the coating material 202 is preferably less than the outer peripheral length of the winding core 11 from the viewpoint of suppressing the overlap of the coating materials.

The coating material 201 is preferably coated so that the thickness of the coating material 201 is equal to or greater than the height of the upper surface 12A2 of the end portion 12A. By applying the coating material 201 in this way, a sufficient amount of the coating material 201 is applied, so that the step caused by the winding start end portion 12A of the sheet 12 can be more effectively relaxed. The specific thickness of the coating material 201 is, for example, when the thickness of the sheet 12 is 50 μm or more and 200 μm or less, it is preferably 52 μm or more and 2000 μm or less, and when the thickness of the sheet 12 is 3 μm or more and less than 50 μm. Is preferably 50.5 μm or more and 2000 μm or less. The thickness of the coating material 201 is the thickness before winding the sheet 12.

The coating material 202 is preferably coated so that the thickness of the coating material 202 is equal to or greater than the height of the surface of the fixing member 17. By applying the coating material 202 in this way, a sufficient amount of the coating material 202 is applied, so that the step caused by the fixing member 17 can be more effectively relaxed. The lower limit of the thickness of the specific coating material 202 is preferably 3 μm or more and 12 μm or less when the thickness of the fixing member 17 is 3 μm or more and 10 μm or less. The thickness of the coating material 202 is the thickness before winding the sheet 12.

After applying the

coating materials

201 and 202, as shown in FIG. 18A, the tip surface 12A1 of the winding start end portion 12A of the sheet 12 comes into contact with the coating material 201, and the sheet 12 covers the coating material 202. The winding start end 12A is arranged so as to. Specifically, the winding start end 12A of the sheet 12 is attached to the fixing member 17, and the winding start end 12A is fixed to the outer peripheral surface 11A of the winding core 11 via the fixing member 17.

After fixing the winding start end 12A of the sheet 12 to the winding core 11, the sheet 12 is wound along the outer peripheral surface 11A of the winding core 11 as shown in FIG. 18B. 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 201, the second gap 15 is filled with the coating material 202, and the first gap 13 is filled. A second filling portion 16 filled in the first filling portion 14 and the second gap 15 is formed. As a result, the roll body 10 is obtained. In addition, in order to surely expand and fill the coating material 201 or the like in the first gap 13 or the like, when the sheet 12 exceeds 1000 m, the sheet 12 is wound 1000 m or more, and when the sheet 12 is less than 1000 m, the sheet 12 is wound. , It is preferable to wind the entire length of the sheet 12.

Further, when the

coating materials

201 and 202 are curable polymer compositions, the curable polymer composition is cured at least after winding the sheet 12 on the second lap. When the curable polymer composition is a one-component curable polymer composition (moisture-curable polymer composition), this composition reacts with humidity in the air and is cured by leaving it at room temperature. Therefore, 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.

The roll body 20 can be manufactured by, for example, the following method. First, the fixing member 17 is arranged on the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11.

After arranging the fixing member 17, the coating material 203 is 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. 19A by using a coating device such as a dispenser or a syringe. ~ 205 is applied. The coating material 204 is applied so as to be in contact with the first end surface 17A of the fixing member 17, and the coating material 205 is applied so as to be in contact with the second end surface 17B of the fixing member 17. The coating material 203 is applied to a portion of the fixing member 17 apart from the second end surface 17B and the coating material 205. The coating material 203 is applied so as to be close to the tip end surface 12A1 of the winding start end portion 12A of the sheet 12, and the coating material 204 is applied so as to be close to the first end surface 17A of the fixing member 17, and the coating material is applied. 205 may be applied so as to be close to the second end surface 17B of the fixing member 17. Further, after the fixing member 17 is arranged on the outer peripheral surface 11A of the winding core 11, the coating materials 203 to 205 are applied, but after the coating materials 203 to 205 are applied, the coating material 204 is the first fixing member 17. The fixing member 17 may be arranged so as to be in contact with or close to the end surface 17A and so that the coating material 205 is in contact with or close to the second end surface 17B of the fixing member 17.

After coating the coating materials 203 to 205, as shown in FIG. 19B, the tip surface 12A1 of the winding start end portion 12A of the sheet 12 comes into contact with the coating material 203, and the sheets 12 contact the

coating materials

204 and 205. The winding start end 12A is arranged so as to cover each of them. Specifically, the winding start end 12A of the sheet 12 is attached to the fixing member 17, and the winding start end 12A is fixed to the outer peripheral surface 11A of the winding core 11 via the fixing member 17.

After fixing the winding start end 12A of the sheet 12 to the winding core 11, the sheet 12 is wound along the outer peripheral surface 11A of the winding core 11 as shown in FIG. 19C. When the sheet 12 is wound, the coating materials 203 to 205 flow and spread, so that the first gap 13 is filled with the coating material 203, the second gap 15 is filled with the coating material 204, and the third gap 21 is filled with the coating material. 205 is filled to form a first filling portion 14 filled in the first gap 13, a second filling portion 16 filled in the second gap 15, and a third filling portion 22 filled in the third gap 21. Will be done. As a result, the roll body 20 is obtained. In order to surely expand and fill the coating material 203 or the like in the first gap 13 or the like, when the sheet 12 exceeds 1000 m, the sheet 12 is wound 1000 m or more, and when the sheet 12 is less than 1000 m. , It is preferable to wind the entire length of the sheet 12.

In all of the above manufacturing methods, the coating materials 201 to 205 are flowed by winding the sheet 12, but the coating material 201 and the like may be flowed in advance before the sheet 12 is wound. However, if the coating material 201 or the like is flowed before the sheet 12 is wound, the number of steps is increased, so it is preferable to flow the coating materials 201 to 205 by winding the sheet 12.

In the above manufacturing method, the coating materials 201 to 205 are applied using a coating device such as a dispenser or a syringe, but even if the coating materials 201 to 205 are applied using a mold having a slit together with the coating device. Good. By applying the coating materials 201 to 205 using a mold having a slit, it is possible to reduce partial variations in the thickness and width of the coating materials 201 to 205. The constituent material of the mold is not particularly limited, and examples thereof include resin and metal.

Specifically, first, as shown in FIG. 20A, a mold 210 having a slit 210A is prepared. This mold 210 is used for coating the coating material 201. Since the length, width, and depth of the slit 210A are the same as the length, width, and thickness of the coating material 201, the description thereof will be omitted here.

After preparing the mold 210, the mold is arranged on the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11 as shown in FIG. 20 (B). When the mold 210 is viewed from directly above, the mold 210 is arranged so that the inner surface of the slit on the fixing member 17 side in the width direction overlaps with or is close to the second end surface 17B of the fixing member 17.

After arranging the mold 210 on the outer peripheral surface 11A of the winding core 11, the coating material 201 is supplied into the slit 210A as shown in FIG. 20B using a coating device such as a dispenser or a syringe. The coating device may be a dispenser or a syringe, but may be a spray or a die coater. Then, if necessary, the excess coating material 201 existing on the surface of the mold 210 is scraped off with a doctor blade or the like. Then, by removing the mold 210, the coating material 201 can be arranged on the outer peripheral surface 11A of the winding core 11. Subsequent steps are the same as the steps described above for the

roll bodies

10 and 20. The coating materials 202 to 205 can also be arranged by using the mold 210 having the slit 210A in the same procedure.

Instead of applying the coating materials 201 to 205, the filling tape may be arranged on the outer peripheral surface 11A of the winding core 11. Specifically, first, as shown in FIG. 21 (A), the coating material 201 is coated on the surface of the base material 221 in the form of a tape by a coating device such as a dispenser or a syringe, and the base material 221 and the coating material 201 are used. The laminated body 220 including the filling tape 222 is formed. Although the filling tape 222 is formed from the coating material 201 here, the coating material 201 may not be used as long as the filling tape is made of a material that spreads by the pressure at the time of winding the sheet.

The constituent material of the base material 221 is not particularly limited, and examples thereof include polyester resins such as polyethylene terephthalate, cellulosic resins such as triacetyl cellulose, and acrylic resins. Further, a known release film may be used as the base material 221. When the coating material 201 is applied to the surface of the base material 221, it is preferable to draw an alignment line 221A on the base material 221 in advance and apply the coating material 201 along the alignment line 221A. By drawing such an alignment line 221A on the base material 221 in advance, the misalignment of the coating material 201 can be suppressed. Further, when the coating material 201 is applied to the surface of the base material 221, it is preferable to unwind the base material 221 at a constant speed by using the unwinding device with the coating device fixed. By unwinding the base material 221 at a constant speed, uneven coating can be suppressed.

After forming the laminate 220, as shown in FIG. 21 (B), the laminate 220 is attached to the outer peripheral surface 11A of the winding core 11 so that the filling tape 222 is in contact with the outer peripheral surface 11A of the winding core 11. Or make it adhere. The filling tape 222 is attached or brought into close contact with or in close contact with the second end surface 17B of the fixing member 17. After that, the base material 221 is peeled off. As a result, the filling tape 222 can be arranged on the outer peripheral surface 11A of the winding core 11. Subsequent steps are the same as the steps described above for the

roll bodies

10 and 20.

In the above, a laminate having one base material and a filling tape is formed, but a laminate having two base materials, a filling tape, and a thickness adjusting member may be formed. Specifically, as shown in FIG. 22A, the coating material 201 is applied to the surface of the first base material 231 by a coating device such as a dispenser or a syringe.

Then, as shown in FIG. 22B, the coating material 201 and the coating material 201 are formed from above the coating material 201 so as to sandwich the thickness adjusting member 232 having a desired thickness in order to obtain the desired thickness. The two base materials 233 are stacked to form the laminated body 230. Examples of the thickness adjusting member 232 include spacers and particles. The peel strength of the second base material 233 with respect to the coating material 201 is preferably smaller than the peel strength of the first base material 231 with respect to the coating material 201. By satisfying such a relationship, the second base material 233 can be easily peeled off. The peel strength of the second base material 233 is a value measured by the following measuring method using a tensile tester (product name "single column type material tester STA-1150", manufactured by A & D Co., Ltd.). When measuring the peel strength, first, double-sided tape (Teraoka Seisakusho Co., Ltd. No. 751B) is attached to a glass plate measuring 30 cm in length and 2.5 cm in width. On the other hand, the laminate 230 is cut into a size of 200 mm in length × 25 mm in width, and the first base material 231 side is attached with double-sided tape on a glass plate and held by a pair of jigs of a tensile tester. Then, the laminate 230 attached to the glass plate is held by a pair of jigs of the tensile tester. When the jig holds the laminated body 230, the second base material 233 is slightly peeled off from the laminated body 230 in advance by hand to create a trigger, and one jig holds the second base material 233 and the other. Hold the glass plate and the laminate 230 on the jig of. Then, in this state, the second base material 233 is peeled off under the conditions of a peeling speed of 300 mm / min, a peeling distance of 50 mm, and a peeling angle of 180 °, and the peeling strength between the coating material 201 and the second base material 233 at that time is determined. Measure. The peel strength is the arithmetic mean value of the values measured three times. The peel strength of the first base material 231 shall be measured in the same manner as the peel strength of the second base material 233. As the first base material 231 and the second base material 233, the same ones as the base material 221 can be used.

After forming the laminated body 230, a predetermined pressure is applied to the laminated body 230. As a result, the thickness of the coating material 201 becomes a desired thickness. Then, the laminated body 230 is cut out in the form of a tape. As a result, the laminate 230 having the filling tape 234 made of the coating material 201 is formed.

After that, the second base material 233 is peeled off as shown in FIG. 22 (C). Then, in this state, as shown in FIG. 22D, the laminate 230 is attached or brought into close contact with the outer peripheral surface 11A of the winding core 11 so that the filling tape 234 comes into contact with the outer peripheral surface 11A of the winding core 11. .. The filling tape 234 is attached or brought into close contact with or in close contact with the second end surface 17B of the fixing member 17. Then, the first base material 231 is peeled off. As a result, the filling tape 234 can be arranged on the outer peripheral surface 11A of the winding core 11. Subsequent steps are the same as the steps described above for the

roll bodies

10 and 20. Instead of the coating materials 202 to 205, the filling tape can be arranged on the outer peripheral surface 11A of the winding core 11 in the same procedure as the filling tape 234.

Alternatively, a mold may be used to form a filling tape and transfer it. By transferring the filling tape using a mold, the filling tape can be easily installed at the same time as the fixing member 17. Specifically, first, the mold 241 is prepared as shown in FIG. 23 (A). The mold 241 has an opening 241A. It is preferable that the side surface of the mold 241 in the longitudinal direction of the mold 241 is open so that the filling tape described later can be easily removed from the mold 241. The mold 241 is, for example, U-shaped. The mold 241 is not particularly limited, but can be formed from, for example, a resin, a metal, or the like. Since the length, width, and depth of the opening 241A of the mold 241 are the same as the length, width, and thickness of the filling tape, the description thereof will be omitted here.

After preparing the mold 241, as shown in FIG. 23 (B), the coating material 201 is poured into the mold 241 to form the filling tape 242. Then, as shown in FIG. 23C, the mold 241 is pressed against the filling tape 242 so as to come into contact with the outer peripheral surface 11A of the winding core 11. When the mold 241 is pressed, if the coating material 201 is a material that exhibits adhesiveness due to moisture, it is preferable to wet the surface of the filling tape 242 with water to make it viscous. By thickening the surface of the filling tape 242, it can be attached to or adhered to the outer peripheral surface 11A of the winding core 11.

After that, remove the mold 241 from the filling tape 242. As a result, the filling tape 242 can be arranged on the outer peripheral surface 11A of the winding core 11. Subsequent steps are the same as the steps described above for the

roll bodies

10 and 20. Instead of the coating materials 202 to 205, the filling tape can be arranged on the outer peripheral surface 11A of the winding core 11 in the same procedure as the filling tape 242.

The filling tape may be transferred to the outer peripheral surface 11A of the winding core 11 by using offset printing. By forming and transferring the filling tape by using offset printing, time management becomes easy, and the filling tape can be installed at a set time with high position accuracy. Specifically, first, as shown in FIG. 24A, the coating material 201 is applied to the outer peripheral surface of the intermediate transfer body 251 (for example, the intermediate transfer roll) by a coating device such as a dispenser or a syringe, and filled. Form tape 252. Then, as shown in FIG. 24B, the filling tape 252 formed on the outer peripheral surface of the intermediate transfer body 251 is transferred to the outer peripheral surface 11A of the winding core 11 by an offset printing method. As a result, the filling tape 252 can be arranged on the outer peripheral surface 11A of the winding core 11. Subsequent steps are the same as the steps described above for the

roll bodies

10 and 20. Instead of the coating materials 202 to 205, the filling tape can be arranged on the outer peripheral surface 11A of the winding core 11 in the same procedure as the filling tape 252.

According to the present embodiment, since the first filling portion 14 is filled in the first gap 13, the portion of the sheet 12 on the first lap on the first filling portion 14 is directed from the separation position P1 toward the tip surface 12A1. Can be lifted gently. As a result, the step caused by the winding start end 12A of the sheet 12 can be alleviated.

According to the present embodiment, since the second filling portion 16 is filled in the second gap 15, the portion of the sheet 12 on the first lap on the second filling portion 16 is directed from the first end surface 17A toward the arrival position P2. It can be lowered gently. Thereby, the step caused by the fixing member 17 can be effectively alleviated.

In the roll body 20, since the third filling portion 22 is filled in the third gap 21, the portion of the sheet 12 on the first lap on the third filling portion 22 can be gently lifted. Thereby, the step caused by the fixing member 17 can be more effectively relaxed.

If the sheet is deformed, there are some parts of the sheet that cannot be used as a product, so the effective length of the sheet is compensated to ensure the effective length. That is, when the portion of the sheet that does not become a product due to deformation becomes long, the sheet loss increases. On the other hand, according to the present embodiment, the step caused by the winding start end portion 12A of the sheet 12 and the step caused by the fixing members 17 and 51 can be alleviated, so that the deformation of the sheet 12 can be suppressed. As a result, seat loss can be reduced.

[Second Embodiment]
Hereinafter, the roll body according to the second embodiment of the present invention will be described with reference to the drawings. 25 is a perspective view of the roll body according to the present embodiment, FIG. 26 is an enlarged view of a part of the roll body of FIG. 25, and FIG. 27 is an enlarged view of each component of the roll body of FIG. 25. It is a figure for demonstrating the dimension, FIG. 28 is a figure at the time of measuring the maximum thickness and length of the 2nd interposition part shown in FIG. 25, and FIG. 29 is a figure which shows the cross-sectional area S3. .. 30 to 37 are enlarged views of a part of another roll body according to the present embodiment, and FIGS. 38 and 39 are views schematically showing a manufacturing process of the roll body according to the present embodiment. Is.

<<< Roll body >>
The roll body 70 shown in FIG. 25 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 FIG. 25, the roll body 70 fixes the first intervening portion 71 and the second interposing portion 72 provided between the sheets 12 after the first lap and a part of the sheet 12 to the winding core 11. A fixing member 17 for the purpose is further provided. The sheet 12 is wound around the winding core 11 in a plurality of turns, for example, two or more turns. In the roll body 70, since the first gap 13 and the second gap 15 are hollow, the first gap 13 is not filled with the first filling portion 14, and the second gap 15 is filled with the second filling. Part 16 is not filled.

<< 1st intervention >>
The first intervening portion 71 is provided between the seats 12 after the first lap. Specifically, the first intervening portion 71 is located on the lower side (winding core 11 side) of the first intervening portion 71, and is in contact with the first intervening portion 71. It is sandwiched by the upper sheet 12 located above the 1 intervening portion 71 and in contact with the 1st intervening portion 71. Therefore, the sheet 12 is always present on the first intervening portion 71. Further, the first intervening portion 71 is provided between the seats 12 after the first lap. Specifically, the first intervening portion 71 is the first gap 13 between the seats 12 after the first lap. It is provided at least in the first region 12D corresponding to. Further, the first intervening portion 71 extends in the width direction DR1 of the winding core 11.

The edge thickness T4 (see FIG. 27) of the end portion 71A on the side of the separation position P3 (see FIG. 26) at which the upper sheet 12 is separated from the lower sheet 12 in the first intervening portion 71 is this thickness when this thickness is thick. Since there is a possibility that a new step may be formed due to the above, a thinner step is preferable. Specifically, for example, the edge thickness T4 is preferably 50 μm or less. The edge thickness T4 is more preferably 10 μm or less, more preferably 2 μm or less, from the viewpoint that the deformation relaxation length can be shortened.

Further, when the sheet 12 is a thin film having a thickness of 3 μm or more and less than 50 μm, it is more susceptible to the step caused by the winding start end portion 12A than when the thickness is thick. Therefore, when such a thin film is used, The edge thickness T4 is preferably 10 μm or less, and more preferably 5 μm or less, more preferably 1 μm or less, from the viewpoint of minimizing the deformation relaxation length.

The edge thickness T4 can be measured by the same method as the edge thickness T1 using a scanning light interference type surface shape measuring machine (product name "New View7300", manufactured by Zygo). It can also be measured as follows. First, a portion including the end portion 71A, the lower sheet 12 in contact with the end portion 71A, and the upper sheet 12 is cut out, and a cross section of this portion is obtained by cutting or polishing with a cutting tool, and a stereomicroscope (for example, a product name) is obtained. Observation with "Digital Microscope VHX-7000", manufactured by KEYENCE CORPORATION) shall be performed.

As shown in FIGS. 26 and 27, the first intervening portion 71 includes a first portion 71B interposed in the first region 12D corresponding to the first gap 13 and a sheet above the first portion 71B. 12 has a second portion 71C located on the arrival position P4 (see FIG. 26) side to reach the lower sheet 12. Since the first intervening portion 71 has not only the first portion 71B but also the second portion 71C, it is possible to suppress the concentration of stress on the stepped portion caused by the winding start end portion 12A, and the upper side can be suppressed. Since the deformation of the sheet 12 after the sheet 12 can be made gentle, this step can be alleviated.

The thickness T5 (see FIG. 27) of the second portion 71C is preferably 2 μm or more and 300 μm or less. When the thickness T5 of the second portion 71C is within this range, the deformation relaxation length can be shortened while avoiding an adverse effect on the winding of the sheet 12. When the thickness T3 of the second portion 71C exceeds 300 μm, the deformation relaxation length can be shortened, but the winding of the sheet 12 may be adversely affected.

The thickness T5 of the second portion 71C is the maximum thickness of the second portion 71C. The thickness T5 of the second portion 71C can be measured by the same method as the edge thickness T1 using a scanning light interference type surface shape measuring machine (product name “New View7300”, manufactured by Zygo). Alternatively, it can be measured as follows. First, this portion is collected and fixed so that the portion including the lower sheet 12, the second portion 71C, and the upper sheet 12 is not crushed. Then, the cross section of this fixed portion is polished, and the thickness T5 of the second portion 71C is measured with a stereomicroscope (for example, product name "digital microscope VHX-7000", manufactured by KEYENCE CORPORATION).

If the thickness of the first intervening portion changes abruptly, the deformation will remain due to this change in thickness, and there is a risk that the step caused by the winding start end will not be sufficiently alleviated. Therefore, it is preferable to secure a sufficient length of the first intervening portion with respect to the thickness of the sheet. However, if the length of the first intervening portion is increased to have other effects such as winding, the length of the first intervening portion is intentionally made shorter than the optimum state to obtain the optimum first. The deformation relaxation length is longer than that of the state having the length of the intervening portion, but the deformation relaxation length can be shortened as compared with the case where the first intervening portion is not provided. Therefore, from the position corresponding to the tip surface 12A1 of the first intervening portion 71 with respect to the distance D2 (see FIG. 27) from the outer peripheral surface 11A of the winding core 11 to the upper surface 12A2 of the winding start end portion 12A to the end on the separation position P3 side. The ratio of the length L3 (length L3 / distance D2) is preferably 1 or more. This ratio is preferably 5 or more, more preferably 50 or more, from the viewpoint of shortening the deformation relaxation length.

The length L3 can be measured as follows. First, the other sheets 12 are unwound, leaving the lower sheet 12 and the upper sheet 12. Here, if the sheet 12 is transparent or translucent, the region where the first intervening portion 71 exists can be visually recognized. Therefore, the distance from the tip surface 12A1 of the winding start end portion 12A to the end of the first intervening portion 71 on the separation position P3 side is observed through the sheet 12 using a ruler or a tape measure, and in the width direction of the sheet 12. Measure 10 points, find the average value, and find the length L3. On the other hand, when the sheet 12 cannot be transparently observed, first, this portion is collected so that the portion including the lower sheet 12, the first intervening portion 71, and the upper sheet 12 is not crushed. Then, after fixing this portion, the cross section is obtained by polishing, and the distance from the position corresponding to the tip surface 12A1 in the first interposition portion to the end on the separation position side is determined by a stereomicroscope (for example, the product name "digital microscope"). VHX-7000 ", manufactured by KEYENCE CORPORATION).

The longer the length L3, the better. For example, when the thickness of the sheet 12 is 50 μm or more and 200 μm or less, the length L3 is preferably 110 μm or more, and in order to further shorten the deformation relaxation length. It is preferably 1 mm or more, more preferably 10 mm or more.

The physical properties such as the tensile strength of the constituent material of the first interposing portion 71 are the same as the physical characteristics such as the tensile strength of the constituent material of the first filling portion 14, and the material constituting the first interposing portion 71 is the first. Since it is the same as the material of 1 filling portion 14, the description thereof will be omitted here.

<< Second intervention >>
The second intervening portion 72 is provided between the seats 12 after the first lap. Therefore, the sheet 12 is always present on the second intervening portion 72. Further, the second intervening portion 72 is provided between the seats 12 after the first lap. Specifically, the second interposing portion 72 is at least the second gap between the seats 12 after the first lap. It is provided in the second region 12E corresponding to 15. Further, the second intervening portion 72 extends in the width direction DR1 of the winding core 11.

The second intervening portion 72 is provided between the same seats 12 as the first intervening portion 71 (for example, between the seat 12 on the second lap and the seat 12 on the third lap), but the second interposing portion 72 is provided. , May be provided between the sheets 12 different from the first intervening portion 71.

The maximum thickness T6 (see FIGS. 27 and 28) of the second intervening portion 72 is preferably 0.01 mm or more. When the maximum thickness T6 of the second intervening portion 72 is 0.01 mm or more, the step caused by the fixing member 17 can be effectively alleviated. The maximum thickness T6 is more preferably 0.02 mm or more, 0.03 mm or more, or 0.04 mm or more from the viewpoint of more effectively relaxing the step. On the other hand, if the maximum thickness T6 is too thick, the step caused by the winding start end portion 12A can be alleviated, but the winding of the sheet 12 may be adversely affected. Therefore, the upper limit of the maximum thickness T6 is preferably 0.2 mm or less or 0.1 mm or less.

The maximum thickness T6 can be measured by the same method as the thickness T2 using a laser displacement meter or a stereomicroscope. When measuring the maximum thickness T6 with a laser displacement meter, first, as in the measurement of the thickness T2 and the like, the roll body 70 is attached to a jig, three laser displacement meters are arranged at predetermined positions, and then the roll is used. The sheet 12 is extended from the body 70 until the second interposition portion 72 is exposed. After that, with the second intervening portion 72 exposed, the displacement amount was continuously measured with a laser displacement meter at a sampling period of 200 μs while rotating the winding core 11 at a rotation speed of 30 mm / s, and the horizontal axis was positioned (mm). ), And the vertical axis is the displacement amount (mm). This measurement is performed from the second tip 72B on the side opposite to the first tip 72A on the fixing member 17 side of the second interposition 72 toward the first tip 72A, and in this measurement, the reference height (displacement amount 0 mm) is performed. The line) is defined as the height of the winding core 11, and the difference between the reference height and the height of the second interposing portion 72 is defined as the thickness of the second interposing portion 72. Then, the maximum thickness T6 of the second intervening portion 72 is obtained by obtaining the difference between the displacement amount 0 mm line and the displacement amount at the position where the displacement amount is the highest. The graph obtained substantially represents a plane including the longitudinal direction of the sheet and the radial direction of the winding core. Further, in this graph, one scale on the horizontal axis is 5 mm, and one scale on the vertical axis is 0.02 mm. In FIG. 27, the first tip 72A exists directly above the fixing member 17.

The maximum thickness T6 can be measured with a stereomicroscope as follows. First, this portion is collected and fixed so that the portion including the lower sheet 12, the second intervening portion 72, and the upper sheet 12 is not crushed. Then, the cross section of this fixed portion is polished, and the maximum thickness T6 of the second intervening portion 72 is measured with a stereomicroscope (for example, product name “Digital Microscope VHX-7000”, manufactured by KEYENCE CORPORATION).

When the thickness of the second intervening portion 72 is measured along the longitudinal direction DR2 of the sheet 12, the second intervening portion 72 in the longitudinal direction DR2 with respect to the maximum thickness T6 (see FIGS. 27 and 28) of the second interposing portion 72. The ratio (length L4 / maximum thickness T6) of the length L4 (see FIG. 27) from the second tip 72B to the position where the maximum thickness T6 of the second intervening portion 72 is obtained is preferably 12 or more. If this ratio is 12 or more, it is possible to suppress the deformation remaining in the vicinity of the second tip 72B of the second interposition portion 72, and if the thickness of the second interposition portion is too thick, it deviates from the perfect circle at the time of winding. The take-up property may be inferior due to such factors, but if this ratio is 12 or more, the second intervening portion 72 is not too thick, so that the inferior take-up property can be suppressed. Further, if the thickness of the second intervening portion is too thick, new deformation due to the second intervening portion may occur, but if this ratio is 12 or more, the occurrence of such new deformation is suppressed. it can. 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 shortening the deformation relaxation length. From the viewpoint of effectively alleviating the step caused by the fixing member, the maximum thickness T6 of the second intervening portion 72 should be thick, so that the upper limit of this ratio is, for example, 2000 or less, 1000 or less, 500 or less, or It is preferably 375 or less.

The length L4 is better from the viewpoint of alleviating the step. For example, when the thickness of the sheet 12 is 50 μm or more and 200 μm or less, the length L4 is preferably 5.0 mm or more, and more preferably. In order to shorten the deformation relaxation length, it is more preferably 7.0 mm or more, more preferably 9.0 mm or more. However, if the length L4 is too long, the second interposition portion having a convex surface is formed in the region R3 (see FIG. 28) from the second tip 72B of the second interposition portion to the position where the maximum thickness is T6 due to processing. Since it becomes difficult to form and there is a possibility that wavy thickness unevenness may occur in the second interposition portion, the upper limit of the length L4 is such that the surface 72C of the second interposition portion 72 in the region R3 tends to be convex and wavy. From the viewpoint of suppressing thickness unevenness, it is preferably 20 mm or less.

The length L4 can be obtained from the graph of the position displacement curve in the same manner as the maximum thickness T6. Specifically, first, when the second tip 72B of the second intervening portion 72 is present, the displacement amount increases. Therefore, from the graph of the position displacement curve, the displacement amount 0 mm line and the position displacement curve at the position where the displacement amount starts to increase. Find the first position, which is the intersection of. Next, a virtual line perpendicular to the displacement amount 0 mm line is drawn through the position where the displacement amount is the highest. Then, the length L4 can be obtained by obtaining the distance between the first position and the second position with the intersection of the virtual line and the displacement amount 0 mm line as the second position.

The length L4 / maximum thickness T6 can roughly represent the shape of the second interposition portion 72, but in order to more appropriately represent the convex shape of the surface 72C, the cross-sectional area of the second interposition portion 72 is further expressed. It is preferable to use. Specifically, the maximum thickness T6 from the second tip 72B in the plane (the plane represented by FIG. 28) including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11 with respect to the maximum thickness T6 of the second intervening portion 72. It is preferable that the ratio (cross-sectional area S3 / maximum thickness T6) of the cross-sectional area S3 (see FIG. 28) of the second interposition portion 72 up to the position is 2.5 or more. When this ratio is 2.5 or more, the cross-sectional area S3 of the second intervening portion 72 is larger than the maximum thickness T6, so that the sheet 12 can be effectively lifted by the second interposing portion 72, thereby causing the step. Can be more relaxed. The lower limit of the cross-sectional area S3 / maximum thickness T6 is 3.0 or more, 3.5 or more, 4.0 or more, 5.0 or more, 5.5 or more, 6.0 or more, from the viewpoint of further alleviating the step. It is preferably 6.5 or more, or 7.0 or more. The upper limit of the cross-sectional area S3 / maximum thickness T6 is not particularly limited, but may be, for example, 20.0 or less, 17.5 or less, 15.0 or less, or 12.5 or less, 10.0 or less. .. The cross-sectional area S3 is the cross-sectional area of the region R3 of the second intervening portion 72 (in FIG. 29, the cross-sectional area of the region surrounded by the solid line in the second interposing portion 72), and is the first position in the graph of the position displacement curve. It can be obtained by obtaining the product of the thickness at each measurement point and the width between the measurement points in the area from to the second position and totaling them.

The physical properties such as the tensile strength of the constituent material of the second interposing portion 72 are the same as the physical characteristics such as the tensile strength of the constituent material of the second filling portion 16, and the material constituting the second interposing portion 72 is the first. Since it is the same as the material of the 2 filling portion 16, the description thereof will be omitted here.

As will be described later, in the sheet 12 (upper sheet 12) outside the DR3 in the radial direction from the first intervening portion 71 and the second intervening portion 72, the step and the fixing member 17 due to the winding start end portion 12A of the sheet 12 Although it is possible to suppress the step caused by the above, the sheet 12 is wound on the sheet 12 (lower sheet 12) inside (the winding core 11 side) in the radial direction DR3 from the first intervening portion 71 and the second interposing portion 72. It is not possible to suppress the step caused by the start end portion 12A and the step caused by the fixing member 17. Therefore, the first intervening portion 71 and the second intervening portion 72 are inside the radial DR3 as much as possible (for example, between the seat 12 on the first lap and the seat 12 on the second lap, and the sheets 12 and 3 on the second lap. It is preferable to be provided between the sheets 12 on the circumference.

<< Other rolls >>
In the roll body 70, the tip end surface 12A1 of the winding start end portion 12A of the sheet 12 and the second end surface 17B of the fixing member 17 are substantially aligned in the cross section along the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11. However, as in the roll body 80 shown in FIG. 30, the tip end surface 12A1 of the winding start end portion 12A of the sheet 12 may protrude from the second end surface 17B of the fixing member 17. In this case, not only the second intervening portion 72 is interposed in the second region 12E between the sheets 12, but also in the third region 12F corresponding to the third gap 21 on the second end surface 17B side between the sheets 12. A third intervening portion 81 may intervene.

<Third intervening part>
The third intervening portion 81 is the same as the second intervening portion 72 except that it is interposed in the third region 12F corresponding to the third gap 21, and thus the description thereof will be omitted here.

The roll body 70 is provided with the second intervening portion 72 in the second region 12E between the sheets 12, but from the viewpoint of alleviating the step caused by the winding start end portion 12A of the sheets 12, the roll body 70 has a second intervening portion between the sheets 12. Since it is sufficient that the first intervening portion 71 is provided in the one region 12D, the second intervening portion 72 may not be provided in the second intervening portion 12E between the sheets 12 as in the roll body 90 shown in FIG. .. In the roll body 90 shown in FIG. 31, the sheets 12 are in close contact with each other in the second region 12E.

The roll body 70 is provided with the first intervening portion 71 in the first region 12D between the sheets 12, but from the viewpoint of alleviating the step caused by the fixing member 17, the roll body 70 has a second region 12E between the sheets 12. Since it is sufficient that the two intervening portions 72 are provided, the first intervening portion 71 may not be provided in the first region 12D between the sheets 12 as in the roll body 100 shown in FIG. 32. In the roll body 100 shown in FIG. 32, the sheets 12 are in close contact with each other in the first region 12D.

Although the roll body 70 includes the first intervening portion 71, the first filling portion 14 may be provided instead of the first intervening portion 71 as in the roll body 110 shown in FIG. 33. That is, the first gap 13 may be filled with the first filling portion 14, and the second intervening portion 72 may be provided in the second region 12E between the sheets 12.

The second intervening portion 72 of the roll body 110 is provided between the seat 12 on the second lap and the sheet 12 on the third lap, but the seat 12 on the first lap is like the roll body 120 shown in FIG. A second intervening portion 72 may be provided between the seat 12 and the seat 12 on the second lap.

Although the roll body 70 includes the second intervening portion 72, the second filling portion 16 may be provided instead of the second intervening portion 72 as in the roll body 130 shown in FIG. 35. That is, the first intervening portion 71 may be provided in the first region 12D between the sheets 12, and the second filling portion 16 may be filled in the second gap 15.

The roll body 70 includes a fixing member 17 for fixing the sheet 12 to the outer peripheral surface 11A of the winding core 11, but the roll body 70 does not have to be provided with the fixing member 17 as in the roll body 140 shown in FIG.

Although the thickness of the sheet 12 of the roll body 70 is uniform, the radial DR3 of the winding core 11 is formed on both end portions 12G extending along the longitudinal direction of the sheet 12 as in the roll body 150 shown in FIG. 37. The convex portions 12H protruding outward may be formed respectively. When the viscosity of the filling material (for example, coating material), the first interposing portion 71, the second interposing portion 72, or the third interposing portion 81 is low, or when the thickness of the sheet is uniform, the filling material (for example, coating) The material, etc.) may protrude from the sheets, and the filling material, etc. may exist in an unintended place. On the other hand, by forming the convex portions 12H on each of the both end portions 12G of the sheet 12, the filling material (for example, the coating material, etc.) protrudes from the both end portions 12G after the filling material is arranged, for example, after the coating material is applied. Can be suppressed. Since both ends 12G of the sheet 12 are cut off and are not used as a product, there is no problem in the product even if both ends 12G of the sheet have such convex portions 12H. The convex portion 12H may be formed by knurling or coating, or may be formed by attaching a tape (for example, a side tape). In the case of coating, the same material as the material of the first filling portion 14 can be used.

In the roll body 150 shown in FIG. 37, convex portions 12H are provided at all portions of both end portions 12G of the sheet 12, but the convex portions 12H may be partially provided. For example, the convex portion 12H is a position that sandwiches the first intervening portion 71 in both end portions 12G extending along the longitudinal direction of the sheet 12, and a position that sandwiches the second interposing portion 72 in both end portions 12G extending along the longitudinal direction of the sheet 12. , And / or may be partially provided at positions sandwiching the third intervening portion 81 at both end portions 12G extending along the longitudinal direction of the sheet 12. When the convex portion 12H is present at a position sandwiching the first intervening portion 71, it is possible to suppress the protrusion of the filling material (for example, the coating material) or the first intervening portion 71, and the convex portion 12H is the second. When it exists at a position where the intervening portion 72 is sandwiched, the protrusion of the filling material (for example, the coating material) or the second interposing portion 72 can be suppressed, and the convex portion 12H is at a position where the third interposing portion 81 is sandwiched. When present in, it is possible to suppress the protrusion of the filling material (for example, the coating material) and the third intervening portion 81.

Although the distance D2, the length L3, the length L4, the maximum thickness T6, and the cross-sectional area S3 are not shown in FIGS. 31 to 36, when the first intervening portion 71 is present, the distance D2 and the length L3 are shown. The length L3 / distance D2 is the same as in the case of the roll body 70, and when the second intervening portion 72 is present, the length L4, the length L4 / maximum thickness T6, and the cross-sectional area S3 / maximum thickness. T6 is the same as in the case of the roll body 70.

Further, in FIGS. 33 and 34, the surfaces of the fixing member 17 are all in close contact with the winding start end portion 12A, but similarly to the roll body 10 shown in FIG. 8, the winding start end portion 12A and the fixing member The first filling portion 14 may be inserted between the 17.

<< Manufacturing method of roll body >>
The roll body 70 can be manufactured, for example, by the following method. First, as shown in FIG. 38 (A), the fixing member 17 is arranged on the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11.

After arranging the fixing member 17, as shown in FIG. 38B, the fixing member 17 is arranged so that the tip end surface 12A1 at the winding start end portion 12A of the sheet 12 is substantially aligned with the second end surface 17B of the fixing member 17. The winding start end portion 12A of the sheet 12 is fixed to the outer peripheral surface 11A of the winding core 11 via.

After fixing the winding start end 12A of the sheet 12 to the outer peripheral surface 11A of the winding core 11, the sheet 12 is wound at least once along the outer peripheral surface 11A of the winding core 11 as shown in FIG. 38 (C). To do. As a result, the intermediate roll body 73 having the first gap 13 and the second gap 15 is obtained.

After obtaining the intermediate roll body 73, as shown in FIG. 39A, the coating material 206 is applied to the surface 12I of the sheet 12 constituting the outer peripheral surface 73A of the intermediate roll body 73 along the width direction DR1 of the winding core 11. 207 is applied. The coating material 206 is applied to at least the first region 12D corresponding to the first gap 13, and the coating material 207 is applied to the second region 12E corresponding to at least the second gap 15. Since the coating materials 74 and 75 are the same as the

coating materials

201 and 202, the description thereof will be omitted here.

After applying the

coating materials

206 and 207, the sheet 12 is wound around the winding core 11 again as shown in FIG. 39 (B). As a result, the

coating materials

206 and 207 flow and spread, so that the coating material 206 is provided in the first region 12D between the sheets 12 and the coating material 207 is provided in the second region 12E between the sheets 12. An intervening portion 71 and a second intervening portion 72 are formed. As a result, the roll body 70 is obtained. If at least one of the

coating materials

206 and 207 is a curable material, the curable material is cured after the sheet 12 is wound again.

In the method for manufacturing the roll body 70, the

coating materials

206 and 207 are not coated using the mold 210 having the slit 210A, but the coating material 206 is coated using the mold 210 having the slit 210A as in the first embodiment. , 207 may be applied. Further, the first interposing portion 71 and the second interposing portion 72 may be formed by a filling sheet instead of the

coating materials

206 and 207 by the same method as in the first embodiment.

According to the present embodiment, since the first intervening portion 71 is provided in the first region 12D between the seats 12, the portion of the sheet 12 on the first intervening portion 71 is gently lifted toward the tip surface 12A1 side. be able to. As a result, the step caused by the winding start end portion 12A of the sheet 12 can be effectively alleviated.

According to the present embodiment, since the second intervening portion 72 is provided in the second region 12E between the seats 12, the portion of the sheet 12 on the second intervening portion 72 can be gently lifted. Thereby, the step caused by the fixing member 17 can be effectively alleviated.

Further, since the step caused by the winding start end portion 12A of the sheet 12 and the step caused by the fixing member 17 can be alleviated, the deformation of the sheet 12 can be suppressed.

When the first gap is filled with the first filling portion and the second gap is filled with the second filling portion, the first filling portion and the second filling portion may flow to a portion where pressure is not applied. On the other hand, in the present embodiment, since the first intervening portion 71 and the second interposing portion 72 are provided between the sheets 12, the materials constituting the first interposing portion 71 and the second interposing portion 72 are difficult to flow. , Hard to stick out.

In order to explain the present invention in detail, examples will be given below, but the present invention is not limited to these descriptions. FIG. 40 (A) is a graph showing the amount of displacement of the roll body according to the seventh embodiment with respect to the position around the first filling portion, and FIG. 40 (B) is the first filling of the roll body according to the eighth embodiment. FIG. 40 (C) is a graph showing the amount of displacement with respect to the position around the portion, and FIG. 40 (C) is a graph showing the amount of displacement with respect to the position around the first filled portion of the roll body according to the ninth embodiment.

<Preparation of composition for hard coat layer>
First, each component was blended so as to have the composition shown below to obtain a composition 1 for a hard coat layer.

(Composition for hard coat layer 1)
-Pentaerythritol triacrylate (product name "KAYARAD-PET-30", manufactured by Nippon Kayaku Co., Ltd.): 60 parts by mass-Photopolymerization initiator (1-hydroxycyclohexylphenyl ketone, product name "Omnirad 184", IGM Resins B. V.): 5 parts by mass, silicone-based leveling agent (product name "Seika Beam 10-28", manufactured by Dainichi Seika Kogyo Co., Ltd., solid content 10%): 0.1 parts by mass, silica particles (product name "Product name" SIRMIBK-H84 ”, manufactured by CIK Nanotech Co., Ltd., average particle size 30 nm, solid content 30%): 3 parts by mass ・ Methylisobutyl ketone (MIBK): 80 parts by mass ・ Cyclohexylnone: 20 parts by mass

<Example 1>
First, a rectangular double-sided tape having a length of 1380 mm, a width of 20 mm and a thickness of 10 μm as a fixing member is wound on the outer peripheral surface of a cylindrical core made of fiber reinforced plastic having an inner diameter of 153 mm, an outer diameter of 167 mm and a width of 1600 mm. It was pasted along the width direction.

After the double-sided tape was attached, the winding core was held by the chucking member of the winding device and fixed to the winding device. Then, as a coating material, a one-component curable silicone resin composition (product name "Hapio Seal Pro HG", so as to contact the first end face and the second end face extending along the width direction of the winding core of the double-sided tape, respectively. Two bottles (manufactured by Campe Hapio Co., Ltd.) were applied in an environment of 25 ° C. The color of this silicone resin composition was gray. Further, the shear viscosity at the time of coating of this silicone resin composition is 180 Pa · s, respectively, and the silicone resin composition is along the width direction of the winding core and the coating amount per unit width is 1 cm ³ / m. Each was applied linearly.

Then, the winding start end in the longitudinal direction of an acrylic resin film (in-plane phase difference Re: 5 nm) having a length of 3000 m, a width of 1340 mm and a thickness of 80 μm as a sheet is attached to a double-sided tape along the width direction of the winding core. , Acrylic resin film was fixed to the outer peripheral surface of the winding core. The acrylic resin film was arranged so that the tip surface of the winding start end of the acrylic resin film in the longitudinal direction was in contact with the silicone resin composition and was substantially aligned with the second end face of the double-sided tape in the radial direction of the winding core. ..

After that, the entire acrylic resin film is wound around the winding core by a winding device, and is located between the winding core and the acrylic resin film on the first lap, and is in contact with the tip end surface of the winding start end of the acrylic resin film. The gap was filled with the silicone resin composition, and the second gap located between the winding core and the acrylic resin film on the first lap and in contact with the first end surface of the double-sided tape was filled with the silicone resin composition. As a result, a roll body was obtained. In the roll body, the silicone resin composition was cured to fill the first gap with a first filling portion having a length of 20 mm, a width of 1340 mm and a maximum thickness of 300 μm, and a second gap having a length of 20 mm and a width. A second filling portion having a maximum thickness of 1340 mm and a maximum thickness of 300 μm was formed.

The shear viscosity of the silicone resin composition was measured using a dynamic viscoelasticity measuring device manufactured by Anton Pearl Japan Co., Ltd. Specifically, the shear viscosity of the silicone resin composition was determined by measuring the shear viscosity at a shear rate of 1 [1 / s] at 25 ° C. using a parallel plate having a diameter of 25 mm. The viscosity of the silicone resin composition was determined by measuring the viscosity of the silicone resin composition 10 times and obtaining the arithmetic mean value of eight shear viscosities excluding the maximum value and the minimum value among the measured 10 viscosities. .. The shear viscosities of the coating materials used in the following other examples were also measured in the same manner as in Example 1.

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

Next, the following measurement conditions were input to RETS-100.
(Measurement condition)
・ Reference measurement range: Rotational photon method ・ Measurement spot diameter: φ5 mm
-Inclination angle range: -40 ° to 40 °
-Measurement wavelength range: 400 nm to 800 nm
-Average refractive index of sample: 1.5
・ Thickness: 80 μm

Next, background data was obtained without installing a sample in this device. The device was a closed system, and this was done every time the light source was turned on.

After that, the sample was installed on the stage in this device. The size of the sample was 50 mm × 50 mm.

After installing the sample, the stage was rotated 360 ° on the XY plane in an environment with a temperature of 23 ° C and a relative humidity of 50%, and the phase-advancing axis and the slow-phase axis were measured. After the measurement was completed, the slow phase axis was selected. After that, the measurement was performed while tilting to the angle range set by the stage about the slow phase axis, and the data (Re) of the set tilt angle range and the set wavelength range were obtained in increments of 10 °. The in-plane phase difference Re was measured at 5 points at different positions. Specifically, as shown in FIG. 2, measurements were taken at a total of 5 points, the center A1 of the sample and the points A2 to A4. Then, among the measured values of 5 points, the arithmetic mean value of 3 points excluding the maximum value and the minimum value was defined as the in-plane phase difference Re.

<Example 2>
In Example 2, instead of the silicone resin composition for forming the first filling portion and the second filling portion, a two-component curable silicone rubber composition (product name "KE-24", manufactured by Shin-Etsu Chemical Co., Ltd.) ) Was used, and a roll body was obtained in the same manner as in Example 1. This silicone rubber composition was white when mixed, and the shear viscosity when the silicone rubber composition was applied was 75 Pa · s.

<Example 3>
In Example 3, instead of the silicone resin composition for forming the first filling portion and the second filling portion, a two-component curable silicone rubber composition (product name "ELASTOSIL (registered trademark) M 4503", Asahi Kasei A roll was obtained in the same manner as in Example 1 except that (condensation curable) manufactured by Wacker Silicone Co., Ltd. was used. The silicone rubber composition was white when mixed, and the shear viscosity when the silicone rubber composition was applied was 40 Pa · s. Further, this silicone rubber composition did not contain a volatile component or an adhesive component.

When a 90 ° peeling test was performed in which the constituent material of the first filling portion in the roll body according to Example 3 was peeled perpendicularly to the outer peripheral surface of the winding core at a peeling speed of 10 mm / min, the tensile force was 0.2 N. The constituent material has peeled off.

The 90 ° peeling test was performed using a sample and a spring type tension gauge (manufactured by Oba Keiki Seisakusho Co., Ltd.). Specifically, first, a mold larger than the size of the sample was prepared, and this mold was placed on the outer peripheral surface of the winding core. Then, a two-component curable silicone rubber composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd., condensation curable) was poured into this mold and cured to obtain a material layer. Then, the material layer was removed from the mold, and the material layer was cut out to a size of 20 mm × 100 mm by a cutting machine to obtain a sample provided on the outer peripheral surface of the winding core. Then, one end of the sample is held by a spring type tension gauge, and the one end is pulled up perpendicularly to the outer peripheral surface of the winding core while measuring the tensile force in an environment of a temperature of 25 ° C. and a relative humidity of 50%. The sample was peeled off at a peeling speed of 10 mm / sec. Then, among the 10 samples subjected to the 90 ° peeling test, the arithmetic mean value of the tensile force of 8 samples excluding the sample having the maximum tensile force and the sample having the minimum tensile force was calculated as the tensile force of the above constituent materials. And said.

The tensile strength of the constituent material of the first filling portion in the roll body according to Example 3 was 3.5 MPa, the elongation at the time of cutting was 450%, and the tear strength was 12.0 N / mm. The hardness of the constituent material of the first filling portion measured by the durometer type A was 28 °, and the linear shrinkage ratio of the constituent material of the first filling portion was 0.10%.

The tensile strength of the constituent material of the first filling part is measured using a sample and a Tensilon universal testing machine (product name "RTC-1310A", manufactured by A & D Co., Ltd.) in accordance with JIS K6251: 2017. did. Specifically, first, a mold larger than the size of the sample was prepared, and this mold was placed on the outer peripheral surface of the winding core. Then, a two-component curable silicone rubber composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd., condensation curable) for forming the first filling portion is poured into this mold and cured. The material layer was obtained. After that, the material layer is removed from the mold, and the material layer is punched to the size of the dumbbell-shaped No. 2 described in JIS K6251: 2017 with a tensile No. 2 dumbbell-shaped punching blade manufactured by Polymer Instruments Co., Ltd., and a sample is prepared. Obtained. The sample was then held in an environment of 25 ° C. for 24 hours. Then, both ends in the longitudinal direction of the sample are gripped by the pair of grippers of the Tencilon universal testing machine, and the initial gripping distance between the grippers is 20 mm and the tensile speed is 100 mm / min in an environment of a temperature of 25 ° C. and a relative humidity of 50%. A tensile test was performed under the conditions, and the tensile strength of the sample was measured. Then, the arithmetic mean value of the tensile strength of 8 samples excluding the maximum value and the minimum value among the 10 samples was taken as the tensile strength of the constituent material.

The elongation at the time of cutting of the constituent material of the first filling part is tensioned using a sample and a Tencilon universal testing machine (product name "RTC-1310A", manufactured by A & D Co., Ltd.) in accordance with JIS K6251: 2017. It was measured in the same manner as the strength measuring method. Then, the arithmetic mean value of the elongation at the time of cutting of 8 samples excluding the maximum value and the minimum value among the 10 samples was defined as the elongation at the time of cutting of the above constituent materials.

The tear strength of the constituent material of the first filling part is based on JIS K6252: 2007, and a sample and Tensilon universal testing machine (product name "RTC-1310A", manufactured by A & D Co., Ltd.) are used. The measurement was performed in the same manner as the method for measuring the tensile strength. Then, the arithmetic mean value of the tear strength of 8 samples excluding the maximum value and the minimum value among the 10 samples was taken as the tear strength of the constituent material.

The hardness of the durometer type A in the constituent material of the first filling portion was measured in accordance with JIS K6253: 1997. Specifically, first, a mold larger than the size of the sample was prepared, and this mold was placed on the outer peripheral surface of the winding core. Then, a two-component curable silicone rubber composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd., condensation curable) for forming the first filling portion is poured into this mold, and it is necessary. To obtain a material layer by curing according to. Then, the material layer was removed from the mold, and the material layer was cut out by a cutting machine or the like to obtain a sample having a size of 100 mm × 100 mm and a thickness of 10 mm. Then, using a durometer type A (product name "GS-719N (TYPEA)", manufactured by TECLOCK Co., Ltd.), the hardness was measured in an environment of a temperature of 25 ° C. and a relative humidity of 50%. Then, the arithmetic mean value of the hardness of 8 samples excluding the maximum value and the minimum value among the 10 samples was defined as the hardness of the constituent material.

The linear shrinkage rate of the first filling portion can be measured as follows. First, a mold having a thickness of 2 mm and a size of 130 mm square is prepared, and a two-component curable silicone rubber composition for forming a first filling portion in this mold (product name "ELASTOSIL (registered trademark) M4503"). , Asahi Kasei Wacker Silicone Co., Ltd. (condensation curable) was poured and cured to obtain a sample (molded product). After the sample was completely cured, the dimensions of the sample were measured and compared with the dimensions inside the mold to determine the linear shrinkage ratio based on JIS K6249: 2003. The arithmetic mean value of the linear shrinkage of eight samples excluding the maximum and minimum values among the ten samples was taken as the linear shrinkage of the constituent materials.

<Example 4>
In Example 4, instead of the silicone resin composition for forming the first filling portion and the second filling portion, a two-component curable silicone rubber composition (product name “ELASTOSIL® M 4601”, Asahi Kasei A roll was obtained in the same manner as in Example 1 except that (additional reactivity) manufactured by Wacker Silicone Co., Ltd. was used. The silicone rubber fat composition was white when mixed, and the shear viscosity when the silicone rubber composition was applied was 20 Pa · s.

<Example 5>
In Example 5, instead of the silicone resin composition for forming the first filling portion and the second filling portion, a two-component curable urethane resin composition (product name “human skin gel”, EXCEL CORPORATION). A roll body was obtained in the same manner as in Example 1 except that the product was used. This urethane resin composition was white when mixed, and the shear viscosity when the urethane resin composition was applied was 6.5 Pa · s.

<Example 6>
First, a rectangular double-sided tape having a length of 1380 mm, a width of 20 mm and a thickness of 10 μm as a fixing member is wound on the outer peripheral surface of a cylindrical core made of fiber reinforced plastic having an inner diameter of 153 mm, an outer diameter of 167 mm and a width of 1600 mm. It was pasted along the width direction.

After attaching the double-sided tape, the winding core was held by the chucking member of the winding device and fixed to the winding device. Then, the winding start end in the longitudinal direction of the polyethylene terephthalate film (PET film, in-plane retardation Re: 1000 nm, Nz coefficient: 20) having a length of 3000 m, a width of 1490 mm and a thickness of 80 μm as a sheet is set in the width direction of the winding core. The PET film was fixed to the outer peripheral surface of the winding core by sticking it on the double-sided tape along the line.

After that, the PET film was wound around once by a winding device to obtain an intermediate roll body. In the intermediate roll body, the first gap located between the winding core and the PET film on the first lap and in contact with the tip end surface of the winding start end of the PET film, and between the winding core and the PET film on the first lap. A second gap was formed in contact with the first end surface of the double-sided tape.

After obtaining the intermediate roll body, a one-component curable silicone resin composition (product name "Hapio Seal Pro") is applied to the surface of the PET film forming the outer peripheral surface of the intermediate roll body along the width direction of the winding core as a coating material. HG ”, manufactured by Campe Hapio Co., Ltd.) was applied in an environment of 25 ° C. The viscosity of the silicone resin composition at the time of application is 180 Pa · s, respectively, and the silicone resin composition is linear so as to be along the width direction of the winding core and the application amount per unit width is 1 cm ³ / m. Was applied to. Specifically, the silicone resin composition was applied to the first region corresponding to the first gap and the second region corresponding to the second gap, respectively.

After applying the silicone resin composition, the entire PET film was wound around the core again by a winding device, and the silicone resin composition was interposed in each of the first region and the second region between the PET films. As a result, a roll body was obtained. In the roll body, the silicone resin composition is cured to form a first intervening portion having a length of 20 mm, a width of 1340 mm and a maximum thickness of 300 μm provided in the first region between the PET films and a second region between the PET films. A second intervening portion having a length of 20 mm, a width of 1340 mm, and a maximum thickness of 300 μm was formed.

The in-plane retardation Re of the PET film used in Example 6 was measured in the same manner as the in-plane retardation Re of the acrylic resin film used in Example 1. However, in this case, the average refractive index N of the sample was set to 1.617.

<Example 7>
In Example 7, an acrylic resin film having a length of 3000 m, a width of 1340 mm and a thickness of 85 μm as a sheet, specifically, a laminate composed of an acrylic resin film and a hard coat layer is used, and a first filling portion and a second filling portion are used. Examples except that the silicone rubber composition for forming the filling portion was linearly applied along the width direction of the winding core so that the coating amount per unit width was 0.3 cm ³ / m. A roll body was obtained in the same manner as in 3.

The laminate was formed as follows. First, using a continuous coating machine, the acrylic resin film having a length of 3000 m, a width of 1340 mm and a thickness of 80 μm used in Example 1 is sent from the unwinding roll to the coated portion of the first unit for the hard coat layer. Composition 1 was applied to form a coating film. After that, the coating film is dried at a temperature of 70 ° C. for 60 seconds in the drying portion, the solvent in the coating film is evaporated, and ultraviolet rays are irradiated in the cured portion so that the integrated light amount becomes 150 mJ / cm ² to cure the coating film. As a result, a hard coat layer having a film thickness of 5.0 μm and a coating width of 1300 mm was formed, and a continuous film-formed laminate having a length of 3000 m and a thickness of 85 μm was obtained.

<Example 8>
In Example 8, the silicone rubber composition for forming the first filling portion and the second filling portion is applied along the width direction of the winding core, and the coating amount per unit width is 0.5 cm ³ / m. A roll body was obtained in the same manner as in Example 7 except that the coating was linearly applied.

<Example 9>
In Example 9, the silicone rubber composition for forming the first filling portion and the second filling portion is applied along the width direction of the winding core, and the coating amount per unit width is 0.8 cm ³ / m. A roll body was obtained in the same manner as in Example 7 except that the coating was linearly applied.

<Example 10>
In Example 10, except that the silicone rubber composition for forming the first filling portion and the second filling portion was linearly applied so that the coating amount per unit width was 1 cm ³ / m. A roll body was obtained in the same manner as in Example 9.

<Example 11>
In Example 11, the shear viscosity at the time of application of the two-component curable silicone rubber composition for forming the first filling portion and the second interposition portion was 2 Pa · s, and the coating amount per unit width was 1. A roll body was obtained in the same manner as in Example 9 except that the thickness was 5 cm ³ / m.

<Example 12>
In Example 12, the shear viscosity at the time of application of the silicone rubber composition for forming the first filling portion and the second interposition portion was 6.5 Pa · s, and the coating amount per unit width was 1.2 cm ^3. A roll body was obtained in the same manner as in Example 9 except that / m was set.

<Example 13>
First, 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 1600 mm was held by a chucking member of the winding device and fixed to the winding device. Then, along the width direction of the winding core, a two-component curable silicone rubber composition (product name "ELASTOSIL (registered trademark) M 4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd., condensation curable) was applied as a coating material at 25 ° C. One was applied in the environment of. The viscosity of the silicone rubber composition at the time of application is 180 Pa · s, and the silicone rubber composition is linear along the width direction of the winding core so that the application amount per unit width is 1 cm ³ / m. It was applied.

After that, a rectangular double-sided tape having a length of 1380 mm, a width of 20 mm and a thickness of 10 μm as a fixing member was wrapped in the width direction of the winding core so that the separation distance between the double-sided tape and the two-component curable silicone rubber composition was 3 mm. I pasted it along. The separation distance was determined by measuring 10 points and calculating the arithmetic mean value of the separation distances at 8 points excluding the maximum value and the minimum value among the measured 10 points. Also in the following examples, the separation distance was determined in this way.

Then, the winding start end in the longitudinal direction of the laminate having a length of 3000 m, a width of 1340 mm and a thickness of 85 μm similar to that of Example 7 as a sheet is attached to a double-sided tape along the width direction of the winding core to attach the laminate. It was fixed to the outer peripheral surface of the winding core. The laminated body was arranged so that the tip surface of the winding start end portion of the laminated body in the longitudinal direction was in contact with the silicone rubber composition and was substantially aligned with the second end surface of the double-sided tape in the radial direction of the winding core.

After that, the laminated body is wound around the winding core by a winding device, and the silicone rubber is located in the first gap between the winding core and the laminated body on the first lap and in contact with the tip end surface of the winding start end of the laminated body. The composition was filled.

After that, the laminated body was wound around once by a winding device to obtain an intermediate roll body. In the intermediate roll body, a second gap was formed between the winding core and the laminated body on the first lap and in contact with the first end surface of the double-sided tape.

After obtaining the intermediate roll body, a two-component curable silicone rubber composition (product name "ELASTOSIL" (registered)) is applied to the surface of the laminate forming the outer peripheral surface of the intermediate roll body along the width direction of the winding core as a coating material. Trademark) M 4503 ”, manufactured by Asahi Kasei Wacker Silicone Co., Ltd., condensation curable) was applied in an environment of 25 ° C. The viscosity of the silicone rubber composition at the time of application is 180 Pa · s, and the silicone rubber composition is linear along the width direction of the winding core so that the application amount per unit width is 1 cm ³ / m. It was applied. Specifically, the silicone rubber composition was applied to the second region corresponding to the second gap.

After applying the silicone rubber composition, the entire laminate was wound around the core again by a winding device, and the silicone rubber composition was interposed in the second region between the laminates. As a result, a roll body was obtained. In the roll body, each of the silicone rubber compositions is cured to form a first filling portion having a width of 1340 mm in the first gap, and a second intervening portion having a width of 1340 mm is formed in the second region between the laminates. It was.

<Example 14>
In Example 12, a two-component curable silicone rubber composition for forming the first filling portion and the second interposition portion (product name “ELASTOSIL® M 4503”, manufactured by Asahi Kasei Wacker Silicone Co., Ltd., condensation curing). Same as Example 11 except that a two-component curable silicone rubber composition (product name "ELASTOSIL (registered trademark) M 4601", manufactured by Asahi Kasei Wacker Silicone Co., Ltd., addition reactivity) was used instead of (property). And got a roll body. The shear viscosity of the silicone rubber composition at the time of application was 10 Pa · s.

<Example 15>
In Example 15, the shear viscosity at the time of application of the two-component curable silicone rubber composition for forming the first filling portion and the second interposition portion was 10 Pa · s, and the coating amount per unit width was 0. A roll body was obtained in the same manner as in Example 13 except that the distance between the double-sided tape and the two-component curable silicone rubber composition was 3 mm, except that the thickness was 8 cm ³ / m.

<Example 16>
In Example 16, the shear viscosity at the time of application of the two-component curable silicone rubber composition for forming the first filling portion and the second interposition portion was 10 Pa · s, and the coating amount per unit width was 1. A roll body was obtained in the same manner as in Example 13 except that the distance between the double-sided tape and the two-component curable silicone rubber composition was 3 mm, except that the thickness was 2 cm ³ / m.

<Comparative example 1>
In Comparative Example 1, a roll body was obtained in the same manner as in Example 1 except that the coating material was not applied.

<Comparative example 2>
In Comparative Example 2, a roll body was obtained in the same manner as in Comparative Example 1 except that the laminate used in Example 7 was used instead of the acrylic resin film.

In the rolls according to Examples 1 to 16, the edge thickness T1 of the first filling portion was measured. The edge thickness T1 was measured using a scanning light interference type surface shape measuring machine (product name "New View7300", manufactured by Zygo). Specifically, first, when all the films and laminates such as acrylic resin film and PET film were unwound, the first filling portion adhered to the laminate side and was peeled off from the winding core. Then, one or more samples having a size of 2 mm × 5 mm including the first filling portion were cut out from the laminated body. The sample was cut out from an arbitrary portion including the tip portion of the first filling portion and not attached with dirt, fingerprints, or the like. Then, the edge thickness T1 of the first filling portion was measured under the following measurement conditions. The edge thickness T1 was obtained by measuring the edge thickness at 10 points and obtaining the arithmetic mean value of the thicknesses at 8 points excluding the maximum value and the minimum value among the measured thicknesses at the 10 points.
(Measurement condition)
-Objective lens: 10x-Zoom: 1x-Measurement area: 2.17mm x 2.17mm
・ Skan Length: 5 μm
・ Min mod: 0.015
・ Temperature: 23 ℃
・ Relative humidity: 50%

<Measurement of deformation relaxation length>
In the rolls according to Examples and Comparative Examples, the length at which the step caused by the winding start end of the film such as the acrylic resin film or PET film or the laminated body 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 end, the film or the laminated body is first fed while measuring the feeding length (m) to the point where the step is visually recognized. Then, the film and the laminated body were cut out at the point where the step was visually recognized. With the polyvinyl alcohol film attached to the cut-out part of the film or laminate, visually observe with reflected light in an indoor environment of 800 Lux or more and 2000 Lux or less with the white LED lamp reflected on the film or laminate. went. Then, the distance from the point where the step was no longer visible to the winding start end was measured, and this was taken as the deformation relaxation length. Here, when the outline of the outline of the white LED lamp reflected on the film or the laminate has a part that is distorted as compared with other parts of the film or the laminate, it is judged that there is a step, and the periphery where the step exists is determined. It was determined that there was no step in the portion where the contour line of the white LED lamp reflected in was the same as the other portion of the film or the laminate. The white LED lamp was arranged so that the longitudinal direction of the white LED lamp was along the longitudinal direction of the film or the laminate. The length of the white LED lamp was set to be the length over the portion of the film or laminate where the step was present and the portion where the step was not present. At the time of observation, the one in which the line of the white LED lamp was clearly visible was appropriately selected so that the white LED lamp was reflected on the film or the laminate so that the outline line could be seen. In addition, visual observation was performed from any angle (−180 ° to 180 °) with reference to the normal direction of the surface of the film or laminate (0 °).

<Confirmation of the existence of the 4th intervening part>
In Examples 3, 7 to 16, it was confirmed whether or not the fourth intervening portion was present on the winding start end portion. Specifically, first, the laminated body was unwound from the roll body until the surface became the laminated body on the second round. Then, in the roll body whose surface was the laminated body on the second lap, the vicinity of the winding start end portion was visually observed, and it was observed whether or not there was a colored portion on the winding start end portion. Then, when the colored portion is present on the winding start end portion, the fourth intervening portion is present, and when the colored portion is not present, the fourth intervening portion is not present. The number of observers was 15, and it was determined that the fourth intervening portion was present when all the observers had a colored portion on the winding start end portion.

<Measurement of L1, L1 + L2, T2, S1, S1 + S2, IL3 inclination>
When the presence of the fourth intervening portion is not confirmed in the roll bodies according to Examples 3 and 7 to 16, the length L1, the thickness T2 and the area S1 are measured, and the length L1 / thickness T2 and the area are measured. S1 / thickness T2 was determined. When the presence of the fourth intervening portion is confirmed, the length L1 + length L2, thickness T1, T2, area S1 + area S2 are measured, and (length L1 + length L2) / thickness T2, ( Area S1 + area S2) / thickness T2 was determined. The lengths L1 and L2, the thickness T2, and the areas S1 and S2 mean the portions shown in FIGS. 4 to 8.

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. The jig was inserted into the hole in the width direction of the winding core to rotatably hold the roll body.

Three laser displacement gauges were arranged above the roll body so that the laser beam was emitted toward the surface of the roll body. The locations of the laser displacement meters are as follows. First, the first position and the second position that divide the width of the laminated body into three equal parts were determined. The first position was located on the first end side in the lateral direction of the laminated body, and the second position was located on the second end side opposite to the first position. The first laser displacement meter is arranged so that the laser beam is applied to the midpoint between the first position and the first end, and the second laser displacement meter is the midpoint between the first position and the second position. The third laser displacement meter was arranged so that the laser beam was irradiated to the second position and the midpoint of the second end.

Then, the roll body was attached to the jig, and the acrylic resin film was fed out from the roll body until the first filling portion was exposed. After that, with the first filling portion exposed, the displacement amount is continuously measured by a laser displacement meter with a sampling period of 200 μs while rotating the winding core at a rotation speed of 30 mm / s in an environment of a temperature of 23 ° C. and a relative humidity of 50%. Was measured, and graphs (see FIGS. 40 (A) to 40 (C)) were obtained in which the horizontal axis was the position (mm) and the vertical axis was the displacement amount (mm). This measurement is performed from the tip of the first filling portion to the position in contact with the tip surface. In this measurement, the reference height (displacement amount 0 mm line) is defined as the height of the winding core, and the winding core and the first filling portion are used. The difference in height was defined as the thickness of the first filling portion. The graph obtained substantially represents a plane including the longitudinal direction of the sheet and the radial direction of the winding core. Further, in this graph, one scale on the horizontal axis is 5 mm, and one scale on the vertical axis is 0.02 mm.

In this graph, the position on the position displacement curve where the displacement amount starts to decrease sharply is set as position E1. Then, when the existence of the fourth intervening portion was not confirmed, the thickness T2 of the position in contact with the tip surface of the first filling portion was obtained by obtaining the difference between the displacement amount 0 mm line and the displacement amount of the position E1. ..

When the presence of the fourth intervening part was confirmed, the thickness T2 was measured by the following method. First, a sample having a size of 2 cm × 2 cm including this portion was collected and fixed so that the portion including the winding start end portion 12A, the first filling portion 14, and the sheet 12 on the second lap was not crushed. Then, the cross section of the fixed sample is polished, and the thickness T2 of the first filling portion is measured with a stereomicroscope (product name "Digital Microscope VHX-7000", KEYENCE Co., Ltd.) in an environment of temperature 23 ° C. and relative humidity 50%. Made by). The measurement of the thickness T2 with a stereomicroscope was performed in a dark field and reflected light at a magnification of 500 times, selecting coaxial epi-illumination as the illumination of the digital microscope.

Further, when the existence of the fourth intervening portion was not confirmed, the length L1 was obtained from the graph of the position displacement curve as in the thickness T2. Specifically, first, the intersection of the displacement amount 0 mm line and the position displacement curve at the position E1 and the position where the displacement amount starts to increase from the graph is set as the position E2. Next, a virtual line IL4 was drawn through the position E1 and perpendicular to the displacement amount 0 mm line. Then, the length L1 was obtained by finding the distance between the position E2 and the position E3, with the intersection of the virtual line IL4 and the displacement amount 0 mm line as the position E3. The area S1 was calculated by obtaining the product of the thickness at each measurement point and the width between the measurement points in the region from the position E2 to the position E3 and totaling them. The width between the measurement points was calculated from the sampling period, the rotation speed of the winding core, and the outer diameter of the winding core based on the above mathematical formula (3), and was 6.24 μm. When the existence of the fourth intervening portion was confirmed, the length L1 + the length L2 was obtained in the same manner as the length L1 when the existence of the fourth intervening portion was not confirmed.

Then, when the existence of the fourth intervening portion was not confirmed, the length L1 / thickness T2 and the area S1 / thickness T2 were obtained using the obtained length L1, thickness T2, and area S1. When the existence of the fourth intervening portion is confirmed, the total of the obtained length L1 and length L2, the thickness T2, and the total of the area S1 and the area S2 are used (length L1 + length L2). / Thickness T2, (area S1 + area S2) / thickness T2 were obtained.

Further, in the above graph, a virtual line IL3 passing through the positions E1 and E2 (see FIGS. 40 (A) to 40 (C)) was drawn, and the slope of the virtual line IL3 was obtained.

<Measurement of L4, T6, S3>
In the roll bodies according to Examples 13 to 16, the length L4, the maximum thickness T6, and the cross-sectional area S3 were measured, and the length L4 / maximum thickness T6 and the cross-sectional area S3 / maximum thickness T6 were obtained. The length L4 and the maximum thickness T6 mean the portion shown in FIG. 27, and the cross-sectional area S3 means the portion shown in FIG. 29. The length L4, the maximum thickness T6, and the cross-sectional area S3 were measured using a jig for rotating the roll body and a laser displacement meter (product name "LK-G30", manufactured by KEYENCE CORPORATION). Specifically, first, as in the measurement of the length L1, etc., the roll body is attached to the jig and three laser displacement meters are arranged at predetermined positions, and then the second intervening portion is exposed from the roll body. The laminate was fed out. After that, with the second interposition part exposed, the displacement amount is continuously measured by a laser displacement meter with a sampling period of 200 μs while rotating the winding core at a rotation speed of 30 mm / s in an environment of a temperature of 23 ° C. and a relative humidity of 50%. Was measured, and a graph was obtained in which the horizontal axis was the position (mm) and the vertical axis was the displacement amount (mm). This measurement is performed from the second tip on the side opposite to the first tip on the double-sided tape side of the second interposition portion to the first tip. In this measurement, the reference height (displacement amount 0 mm line) is used as the winding core. The difference in height between the winding core and the second intervening portion was defined as the thickness of the second interposing portion. The graph obtained substantially represents a plane including the longitudinal direction of the sheet and the radial direction of the winding core. Further, in this graph, one scale on the horizontal axis is 5 mm, and one scale on the vertical axis is 0.02 mm.

In this graph, the position where the displacement amount was the highest was found, and the difference between the displacement amount 0 mm line and the displacement amount at this position was obtained to obtain the maximum thickness T6 at the second intervening portion.

Also, from this graph, the first position, which is the intersection of the displacement amount 0 mm line and the position displacement curve, was found at the point where the displacement amount starts to increase. Next, a virtual line perpendicular to the displacement amount 0 mm line was drawn through the position where the displacement amount was the highest. Then, the length L4 was obtained by obtaining the distance between the first position and the second position with the intersection of the virtual line and the displacement amount 0 mm line as the second position. The cross-sectional area S3 was calculated by obtaining the product of the thickness at each measurement point and the width between the measurement points in the region from the first position to the second position and totaling them. The width between the measurement points was calculated from the sampling period, the rotation speed of the winding core, and the outer diameter of the winding core based on the above mathematical formula (3), and was 6.24 μm.

Further, the length L4 / maximum thickness T6 and the cross-sectional area S3 / maximum thickness T6 were obtained by using the obtained length L4, maximum thickness T6, and cross-sectional area S3.

The results are shown in Tables 1 to 3 below.

The roll body according to Comparative Example 1 had a long deformation relaxation length at the winding start end and a deformation relaxation length at the double-sided tape. This is because since the first gap was hollow, the step caused by the winding start end of the acrylic resin film was large, and because the second gap was hollow, the step caused by the double-sided tape was large. it is conceivable that. On the other hand, the roll bodies according to Examples 1 to 12 were shorter than the roll bodies according to Comparative Example 1 together with the deformation relaxation length at the winding start end and the deformation relaxation length in the double-sided tape. This is because, in the roll bodies according to Examples 1 to 5 and 7 to 15, since the first filling portion was filled in the first gap, the step caused by the winding start end portion of the acrylic resin film was small, and the step was small. It is considered that this is because the second filling portion was filled in the second gap or the second intervening portion was interposed in the region corresponding to the second gap, so that the step caused by the double-sided tape was small. Further, in the sixth embodiment, since the first intervening portion is interposed in the first region corresponding to the first gap, the step caused by the winding start end portion of the PET film is small, and the second intervening portion corresponding to the second gap is small. It is considered that this is because the step caused by the double-sided tape was small because the second intervening portion was interposed in the two regions.

The first filled portion of the roll body according to Examples 3 and 8 to 16 has a length L1 / thickness T2 or (length L1 + length L2) / thickness T2 of 90 or more, and / or an area S1 / thickness T2. Alternatively, since (area S1 + area S2) / thickness T2 was 3.0 or more, the deformation relaxation length at the winding start end portion was larger than that of the roll body according to Example 7 in which the length L1 / thickness T2 was less than 90. It was short.

The second intervening portion of the roll body according to Examples 13 to 16 has a length L4 / maximum thickness T6 of 12 or more and / or a cross-sectional area S3 / maximum thickness T6 of 2.5 or more. The deformation relaxation length of the tape was short.

In the rolls according to Examples 1, 2, 6 and 13, the shear viscosity of the silicone resin composition or the silicone rubber composition at the time of application was 60 Pa · s or more, so that the winding core and the acrylic resin film or PET film were formed. No protrusion of the above composition from between was confirmed in either the case where pressure was applied during application and during winding. In the rolls according to Examples 3, 4, 7 to 10, the shear viscosity of the composition at the time of coating was less than 60 Pa · s, but it was 15 Pa · s or more, so that there was no protrusion during coating. However, when the pressure at the time of winding was applied, the composition was confirmed to protrude. In Examples 5, 11, 12, 14 to 16, the shear viscosity of the composition at the time of application was less than 15 Pa · s, so that the composition was confirmed to protrude from the core and the acrylic resin film. ..

In addition, a reworkability test was conducted on the roll body according to Example 3. Specifically, first, the acrylic resin film was unwound to expose the first filling portion. Then, a blade-shaped tool was made at the end of the first filling portion so as not to damage the winding core, and an attempt was made to slowly peel the first filling portion from the winding core with a finger. The evaluation criteria for reworkability were good when the first filling part was peeled off cleanly, and poor when a part of the first filling part remained on the winding core due to breakage or the like. In such an evaluation, the first filled portion of the roll body according to Example 3 was peeled off cleanly, which was good. When the reworkability test was performed on the rolls according to the examples other than the third example, the reworkability was as good as that of the first filled portion according to the third embodiment. The tensile strength of the constituent material of the first filling portion in the roll body according to the examples other than Example 3 is 3.0 MPa or more and 5.5 MPa or less, the elongation at the time of cutting is 250% or more and 600% or less, and the tear strength. The hardness is 6 N / mm or more and 25 N / mm or less, the hardness of the constituent material of the first filling portion measured by the durometer type A is 10 ° or more and 50 ° or less, and the linear shrinkage of the constituent material of the first filling portion. The rate was in the range of 0% or more and 1.0% or less. Further, as shown in Table 1, the edge thickness T1 of the first filled portion of the roll body according to Examples 1 to 16 was in the range of 1.5 μm or more and 20 μm or less. When the first filling portion was peeled off, or when cleaning or wiping, a thicker edge thickness T1 was slightly easier to peel off or remove the first filling portion.

In Examples 1 to 12, the silicone resin composition or the silicone rubber composition is applied so as to be in contact with the first end face and the second end face of the double-sided tape, but in Examples 1 to 12, the silicone resin composition When the silicone resin composition or silicone rubber composition is applied or the double-sided tape is arranged so that the separation distance between the silicone rubber composition and the double-sided tape is 1 mm, a roll body can be stably produced. The obtained rolls were also substantially the same as the evaluation results and measurement results of the rolls according to Examples 1 to 12, respectively. Similarly, in Examples 1 to 12, the silicone resin composition or the silicone rubber composition is applied or the double-sided tape is applied so that the separation distance between the silicone resin composition or the silicone rubber composition and the double-sided tape is 3 mm. When the rolls were arranged, the rolls could be stably produced, and the obtained rolls were almost the same as the evaluation results and measurement results of the rolls according to Examples 1 to 12, respectively. In these cases, first, the silicone resin composition or the like is applied linearly along the width direction of the winding core, and then the separation distance between the second end surface of the double-sided tape and the silicone resin composition or the like is 1 mm or 3 mm. A double-sided tape is placed on the surface, and the silicone resin composition or the like is linearly applied along the width direction of the winding core so that the separation distance between the first end surface of the double-sided tape and the silicone resin composition or the like is 1 mm or 3 mm. I went in the order of doing.

Further, in Example 2, when the silicone rubber composition was applied and the double-sided tape was arranged so that the separation distance between the silicone rubber and the double-sided tape was 5 mm, a roll body could be stably produced and obtained. The rolls were also substantially the same as the evaluation results and measurement results of the rolls according to Example 2. The edge thickness T1 was 2 μm. In this case, first, the silicone rubber composition is applied linearly along the width direction of the winding core, and then the double-sided tape is arranged so that the separation distance between the second end surface of the double-sided tape and the silicone rubber composition is 5 mm. Further, the silicone rubber composition was applied linearly along the width direction of the winding core so that the separation distance between the first end surface of the double-sided tape and the silicone rubber composition was 5 mm.

In Example 3, a silicone rubber composition having a shear viscosity at the time of application of 40 Pa · s was used. For example, the shear viscosity at the time of application was set to 7 Pa · s, and between the double-sided tape and the silicone rubber composition. When the separation distance was set to 11 mm, the silicone rubber composition located on the first end surface side of the double-sided tape flowed to the side opposite to the double-sided tape side. Similarly, when the shear viscosity was set to 250 Pa · s and the silicone rubber composition was arranged so as to be in contact with the first end face and the second end face of the double-sided tape, even if the acrylic resin film was wound, it was sufficient. Since it was difficult to make it flow, another step was generated at the beginning and end of winding, although it was slight after curing.

10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150 ... Roll body 11 ... Winding core 11A ... Outer peripheral surface 12 ... Sheet 12A ... Winding start end 12A1 ... Tip surface 12D ... 1st region 12E ... 2nd region 12F ... 3rd region 12G ... End portion 12H ... Convex portion 13 ... 1st gap 14 ...

1st filling portion

15, 52 ...

2nd gap

16, 53 ... 2nd Filling parts 17, 51 ... Fixing members 17A, 51A ... First end faces 17B, 51B ... Second end faces 21, 54 ...

Third gaps

22, 55 ... Third filling parts 71 ... First intervening parts 72 ... Second intervening parts 73 ... Intermediate roll body 81 ... Third intervening portion 201 to 207 ... Coating material

Claims

A method for manufacturing a roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core.
A step of applying the coating material to the outer peripheral surface of the winding core along the width direction of the winding core, and
A step of arranging the winding start end portion of the sheet in the longitudinal direction on the outer peripheral surface, and
A step of winding the sheet around the winding core and filling at least the first gap with the coating material is provided.
The coating of the coating material or the arrangement of the winding start end portion is performed so that the coating material is in contact with or close to the tip surface of the winding start end portion located in the longitudinal direction.
A manufacturing method in which the first gap is a gap located between the winding core and the sheet on the first round and in contact with the tip surface.
A method for manufacturing a roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core.
A step of arranging the winding start end portion of the sheet in the longitudinal direction on the outer peripheral surface, and
A step of winding the sheet around the winding core at least once to obtain an intermediate roll body having a first gap.
A step of applying the coating material along the width direction of the winding core to the surface of the sheet forming the outer peripheral surface of the intermediate roll body, and
After applying the coating material, the sheet is wound around the winding core again, and the coating material is interposed between the sheets.
The first gap is a gap located between the winding core and the sheet on the first lap and in contact with the tip surface located at the winding start end in the longitudinal direction.
A manufacturing method in which the coating material is applied to a first region corresponding to the first gap on the surface of the sheet constituting the outer peripheral surface of the intermediate roll body.
A method for manufacturing a roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core.
A first end surface extending in the width direction of the winding core and a first end surface for fixing a part of the sheet to the winding core on the outer peripheral surface of the winding core along the width direction of the winding core. The process of arranging the fixing member having the second end surface on the opposite side to the
A step of applying the coating material to the outer peripheral surface of the winding core along the width direction of the winding core, and
A step of fixing a part of the sheet to the winding core via the fixing member, and
After applying the coating material and fixing a part of the sheet to the winding core, the sheet is wound around the winding core to fill at least one of the second gap and the third gap with the coating material. With the process of
The coating of the coating material or the arrangement of the fixing member is such that the coating material is located on the first end surface side or the second end surface side, and the coating material is in contact with or close to the first end surface or the second end surface. Or such that the coating material is located on the first end face side and the second end face side, respectively, and the coating material is in contact with or close to the first end face and the second end face. I,
The second gap is a gap located between the winding core and the sheet on the first lap and in contact with the first end surface.
A manufacturing method in which the third gap is a gap located between the winding core and the sheet on the first round and in contact with the second end surface.
A method for manufacturing a roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core.
A first end surface extending in the width direction of the winding core and a first end surface for fixing a part of the sheet to the winding core on the outer peripheral surface of the winding core along the width direction of the winding core. The process of arranging the fixing member having the second end surface on the opposite side to the
A step of fixing a part of the sheet to the winding core via the fixing member, and
A step of winding the sheet around the winding core at least once to obtain an intermediate roll body having a second gap and a third gap.
A step of applying a coating material to the surface of the sheet constituting the outer peripheral surface of the intermediate roll body along the width direction of the winding core, and a step of applying the coating material.
A step of rewinding the sheet around the winding core after applying the coating material is provided.
The second gap is a gap located between the winding core and the sheet on the first round and in contact with the first end surface of the fixing member.
The third gap is a gap located between the winding core and the sheet on the first round and in contact with the second end surface of the fixing member.
The coating material is applied to at least one of a second region corresponding to the second gap and a third region corresponding to the third gap on the surface of the sheet constituting the outer peripheral surface of the intermediate roll body. The manufacturing method to be done.
The production method according to any one of claims 1 to 4, wherein the coating material has fluidity.
The production method according to any one of claims 1 to 5, wherein the coating material is a curable polymer composition.
The production method according to any one of claims 1 to 6, wherein the coating material contains a coloring material or a light emitting material.
The manufacturing method according to any one of claims 1 to 7, wherein the sheet has a resin film.
The production method according to any one of claims 1 to 7, wherein the sheet contains an acrylic resin, a polyester resin, or a cycloolefin polymer resin.
The manufacturing method according to claim 8 or 9, wherein the thickness of the sheet is 15 μm or more and 300 μm or less.
The production method according to any one of claims 1 to 10, wherein the sheet is a laminate having a base material and one or more functional layers laminated on the base material.
The manufacturing method according to any one of claims 1 to 11, wherein the sheet is used for an optical film, a polarizing plate, or a display device.
A roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core.
A first gap located between the winding core and the sheet on the first lap and in contact with the tip surface located in the longitudinal direction at the winding start end of the sheet on the first lap in the longitudinal direction.
A first filling portion that is filled in the first gap and extends in the width direction of the winding core,
A roll body.
It is provided between the winding core and the sheet on the first round, has a first end surface extending in the width direction of the winding core, and a second end surface opposite to the first end surface, and with respect to the winding core. A fixing member that fixes a part of the sheet and
A second gap located between the winding core and the sheet on the first round and in contact with the first end surface of the fixing member.
A third gap located between the winding core and the sheet on the first round and in contact with the second end surface of the fixing member.
At least one of a second filling portion filled in the second gap and extending in the width direction of the winding core and a third filling portion filled in the third gap and extending in the width direction of the winding core. The roll body according to claim 13, further comprising.
A roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core.
A first gap located between the winding core and the sheet on the first lap and in contact with the tip surface located in the longitudinal direction at the winding start end of the sheet on the first lap in the longitudinal direction.
A first intervening portion provided in a first region corresponding to at least the first gap between the sheets after the first lap and extending in the width direction of the winding core, and a first intervening portion.
A roll body.
A roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core.
It is provided between the winding core and the sheet on the first round, has a first end surface extending in the width direction of the winding core and a second end surface opposite to the first end surface, and has the said to the winding core. A fixing member that fixes a part of the seat and
A second gap located between the winding core and the sheet on the first round and in contact with the first end surface of the fixing member.
A third gap located between the winding core and the sheet on the first round and in contact with the second end surface of the fixing member.
At least one of a second filling portion filled in the second gap and extending in the width direction of the winding core and a third filling portion filled in the third gap and extending in the width direction of the winding core.
A roll body.
A roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core.
It is provided between the winding core and the sheet on the first round, has a first end surface extending in the width direction of the winding core and a second end surface opposite to the first end surface, and has the said to the winding core. A fixing member that fixes a part of the seat and
A second gap located between the winding core and the sheet on the first round and in contact with the first end surface of the fixing member.
A third gap located between the winding core and the sheet on the first round and in contact with the second end surface of the fixing member.
The second intervening portion provided in the second region corresponding to the second gap between the sheets after the first lap and extending in the width direction of the winding core, and the sheets between the sheets after the first lap. At least one of the third intervening portions provided in the third region corresponding to the third gap and extending in the width direction of the winding core.
A roll body.
The roll body according to claim 13 or 14, further comprising a fourth intervening portion that is connected to the first filling portion and is interposed between the sheet on the first lap and the sheet on the second lap.
If there is no fourth intervening portion that is connected to the first filling portion and is interposed between the sheet on the first lap and the sheet on the second lap, the tip surface of the first filling portion When the ratio of the length L1 of the sheet in the first filling portion along the longitudinal direction to the thickness T2 at the contacting position is 90 or more and the fourth intervening portion is present, the first filling portion is present. The length L1 of the sheet in the first filling portion along the longitudinal direction and the length L2 of the sheet in the fourth intervening portion along the longitudinal direction with respect to the thickness T2 at the position in contact with the tip surface of the portion. The roll body according to claim 13 or 14, wherein the total ratio of the above is 90 or more.
When the fourth intervening portion is not present, the outer peripheral surface of the winding core and the outer peripheral surface of the winding core in a plane including the longitudinal direction of the sheet and the radial direction of the winding core with respect to the thickness T2 of the first filling portion. When the ratio of the area S1 of the region sandwiched by the surface of the 1 filling portion is 3.0 or more and the fourth intervening portion is present, the length of the sheet with respect to the thickness T2 of the first filling portion. The area S1 of the region sandwiched between the outer peripheral surface of the winding core and the surface of the first filling portion in the plane including the direction and the radial direction of the winding core, and the outer peripheral surface of the winding core and the surface of the fourth intervening portion. The roll body according to claim 19, wherein the ratio of the total of the areas S2 of the regions sandwiched by the two is 3.0 or more.
When the thickness of the second intervening portion is measured along the longitudinal direction of the sheet, the first tip of the second intervening portion on the fixing member side in the longitudinal direction with respect to the maximum thickness T6 of the second interposing portion. The roll body according to claim 17, wherein the ratio of the length L4 from the second tip on the opposite side to the position where the maximum thickness T6 of the second intervening portion is 12 or more.
The second from the second tip of the second interposition portion to the position where the maximum thickness T6 is obtained in a plane including the longitudinal direction of the sheet and the radial direction of the winding core with respect to the maximum thickness T6 of the second interposition portion. The roll body according to claim 21, wherein the ratio of the cross-sectional area S3 of the intervening portion is 2.5 or more.
The roll body according to claim 15 or 17, wherein the sheet has convex portions protruding in the radial direction of the winding core at both ends extending along the longitudinal direction of the sheet.
The roll body according to any one of claims 13 to 23, wherein the sheet has a resin film.
The roll body according to any one of claims 13 to 23, wherein the sheet contains an acrylic resin, a polyester resin, and a cycloolefin polymer resin.
The roll body according to claim 24 or 25, wherein the thickness of the sheet is 15 μm or more and 300 μm or less.
The roll body according to claim 13, wherein the first filling portion contains a coloring material or a light emitting material.
The roll body according to claim 14 or 16, wherein the second filling portion and the third filling portion contain a coloring material or a light emitting material, respectively.
The roll body according to claim 15, wherein the first intervening portion contains a coloring material or a light emitting material.
The roll body according to claim 17, wherein the second intervening portion and the third interposing portion contain a coloring material or a light emitting material, respectively.
The roll body according to claim 13, wherein the first filling portion contains a cured product of a curable polymer composition.
The roll body according to claim 14 or 16, wherein the second filling portion and the third filling portion each contain a cured product of a curable polymer composition.
The roll body according to claim 15, wherein the first interposition portion contains a cured product of a curable polymer composition.
The roll body according to claim 17, wherein the second interposition portion and the third interposition portion each contain a cured product of a curable polymer composition.
The roll body according to any one of claims 13 to 34, wherein the sheet is a laminated body having a base material and one or more functional layers laminated on the base material.
The roll body according to any one of claims 13 to 35, wherein the sheet is used for an optical film, a polarizing plate, or a display device.