WO2022025289A1 - Roll body - Google Patents

Abstract

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

Description

Roll body Reference of related application

This application enjoys the benefit of the priority of the preceding Japanese application, Japanese Patent Application No. 2020-13104 (Filing date: July 31, 2020), and the entire disclosure thereof is hereby cited by reference. It is considered to be a part of.

The present invention relates to 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 return to its original state.

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 the 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 portion). A step may be generated due to this fixing member.

Currently, in order to effectively alleviate these steps, the gap formed when the sheet on the first lap moves to the second lap and the gap formed by the fixing member and the sheet on the first lap are filled with the filler. However, if the filler is filled in these gaps, the filler may squeeze out due to the pressure at the time of winding the sheet. If the protruding portion is exposed, the protruding portion may adhere to the roll body or the like, which causes contamination.

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

The present invention includes the following inventions.
[1] A roll body including a winding core and a long sheet wound around the outer peripheral surface of the winding core, located between the winding core and the sheet on the first lap, and said. The first gap in contact with the tip surface at the winding start end of the sheet in the longitudinal direction on the first lap, the first filling portion filled in the first gap and extending in the width direction of the winding core, and the width direction. A roll body comprising a first exposure suppressing member for suppressing the end portion of the first filling portion from being exposed on the outside of the sheet.

[2] The roll body according to the above [1], wherein the first exposure suppressing member is located outside the end portion of the first filling portion in the width direction and is covered with the sheet.

[3] The sheet has an effective region and an ineffective region located outside the effective region in the width direction, and the first exposure suppressing member is located in the ineffective region of the sheet. The roll body according to the above [1] or [2].

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

[5] In any one of the above [2] to [4], the length of the first exposure suppressing member in the circumferential direction of the winding core is larger than the maximum length of the first filling portion in the circumferential direction. The roll body described.

[6] The end portion of the first filling portion protrudes to the outside of the sheet, the first exposure suppressing member has a sheet shape, and covers the protruding end portion of the first filling portion. , The roll body according to the above [1].

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

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

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

[10] 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 said to be 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 filling portion located between the sheets and in contact with the first end surface of the fixing member, a second filling portion filled in the second gap and extending in the width direction of the winding core, and the width thereof. A roll body including a second exposure suppressing member that suppresses the end portion of the second filling portion in the direction from being exposed on the outside of the sheet.

[11] The roll body according to the above [10], wherein the second exposure suppressing member is located outside the end portion of the second filling portion in the width direction and is covered with the sheet.

[12] The sheet has an effective region and an ineffective region located outside the effective region in the width direction, and the second exposure suppressing member is located in the ineffective region of the sheet. The roll body according to the above [11].

[13] The roll body according to the above [11] or [12], wherein the second exposure suppressing member extends along the circumferential direction of the winding core.

[14] In any one of the above [11] to [13], the length of the second exposure suppressing member in the circumferential direction of the winding core is larger than the maximum length of the second filling portion in the circumferential direction. The roll body described.

[15] The end portion of the second filling portion protrudes to the outside of the sheet, the second exposure suppressing member has a sheet shape, and covers the protruding end portion of the second filling portion. , The roll body according to the above [10].

[16] The roll body according to any one of the above [10] to [15], wherein the second filling portion contains a coloring material or a light emitting material.

[17] The roll body according to any one of the above [10] to [16], wherein the second filling portion contains a cured product of a curable polymer composition.

[18] 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 said to be wound. The first end surface extending in the width direction of the core and the second end surface located on the side opposite to the first end surface and on the winding start end side in the longitudinal direction of the sheet on the first lap from the first end surface. A first portion that has and is located between the winding core and the sheet on the first lap and is in contact with the first end surface of the fixing member and a fixing member that fixes a part of the sheet to the winding core. An intervening portion provided in a region corresponding to at least the second gap between the two gaps and the sheet between the first and subsequent laps and extending in the width direction of the winding core, and an end portion of the intervening portion in the width direction are provided. A roll body including a second exposure suppressing member that suppresses exposure on the outside of the sheet.

[19] The second exposure suppressing member is located outside the end of the intervening portion in the width direction, and at least a part of the second exposure suppressing member is covered with the sheet. 18].

[20] The roll body according to the above [18] or [19], wherein the second exposure suppressing member extends along the circumferential direction of the winding core.

[21] The item according to any one of [18] to [20], wherein the length of the second exposure suppressing member in the circumferential direction of the winding core is larger than the maximum length of the intervening portion in the circumferential direction. Roll body.

[22] The roll body according to any one of the above [18] to [21], wherein the intervening portion contains a coloring material or a light emitting material.

[23] The roll body according to any one of [18] to [21] above, wherein the intervening portion contains a cured product of a curable polymer composition.

[24] The roll body according to any one of the above [1] to [23], wherein the sheet is a resin film, paper, or glass film.

[25] The roll body according to any one of the above [1] to [23], wherein the sheet contains an acrylic resin, a polyester resin, or a cycloolefin polymer resin.

[26] The roll body according to any one of the above [1] to [25], wherein the thickness of the sheet is 15 μm or more and 300 μm or less.

According to one aspect of the present invention, it is possible to provide a roll body that can effectively alleviate the step caused by the winding start end of the sheet and suppress contamination. Further, according to another aspect of the present invention, it is possible to provide a roll body capable of effectively alleviating a step caused by a fixing member and suppressing contamination.

FIG. 1 is a perspective view of a roll body according to the first embodiment. FIG. 2 is a plan view of the roll body of FIG. FIG. 3 is an enlarged view of a part of the cross section of the line I-I in 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 a diagram showing two regions around the first filling portion of the roll body of FIG. 1. FIG. 6 is an enlarged view of a part of the cross section of the line II-II in the roll body of FIG. FIG. 7 is an enlarged plan view of a part of the roll body of FIG. FIG. 8 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 9 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 10 is a plan view of a sample for specifying a position for measuring an in-plane phase difference. FIG. 11 is a plan view of a roll body for specifying a measurement position by a laser displacement meter. FIG. 12 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. 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. FIG. 17 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 18 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 19 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 20 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 21 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 22 is an enlarged view of a part of another roll body according to the first embodiment. FIG. 23 is a plan view of another roll body according to the first embodiment. FIG. 24 is a cross-sectional view taken along the line III-III in the roll body of FIG. 23. FIG. 25 is a cross-sectional view taken along the line IV-IV in the roll body of FIG. 23. FIG. 26 is a plan view of another roll body according to the first embodiment. FIG. 27 is an enlarged view of a part of the cross section of the VV line in the roll body of FIG. 26. FIG. 28 is a diagram when measuring the maximum thickness and length of the second intervening portion shown in FIG. 27. FIG. 29 is an enlarged view of a part of the cross section of the VI-VI line in the roll body of FIG. 26. 30 (A) and 30 (B) are views schematically showing the manufacturing process of the roll body according to the first embodiment. 31 (A) and 31 (B) are views schematically showing the manufacturing process of the roll body according to the first embodiment. 32 (A) and 32 (B) are views schematically showing the manufacturing process of the roll body according to the first embodiment. FIG. 33 is a diagram schematically showing the manufacturing process of the roll body according to the first embodiment. FIG. 34 is a perspective view of the roll body according to the second embodiment. FIG. 35 is a plan view of the roll body of FIG. 34. FIG. 36 is an enlarged view of a part of the cross section of the VII-VII line in the roll body of FIG. 35. FIG. 37 is an enlarged view of a part of the cross section of the line VIII-VIII in the roll body of FIG. 35. FIG. 38 is an enlarged plan view of a part of the roll body of FIG. 34. FIG. 39 is an enlarged view of a part of another roll body according to the second embodiment. FIG. 40 is a plan view of another roll body according to the second embodiment. FIG. 41 is an enlarged view of a part of the cross section of the IX-IX line in the roll body of FIG. 40. FIG. 42 is an enlarged view of a part of the cross section of the XX line in the roll body of FIG. 40. FIG. 43 is an enlarged view of a part of the cross section of the XI-XI line in the roll body of FIG. 40. 44 (A) and 44 (B) are views schematically showing the manufacturing process of the roll body according to the second embodiment. 45 (A) and 45 (B) are views schematically showing the manufacturing process of the roll body according to the second embodiment.

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

<<< Roll body >>>
The roll body 10 shown in FIGS. 1 and 2 includes a winding core 11 and a long sheet 12 wound around the outer peripheral surface 11A of the winding core 11. As shown in 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 provided, and the winding is performed as shown in FIGS. 2 and 6. A pair of first exposure suppressing members 18 for suppressing the end portion 14A of the first filling portion 14 in the width direction DR1 of the core 11 from being exposed to the outside of the sheet 12, and a second filling portion 18 in the width direction DR1 of the winding core 11. Further, a pair of second exposure suppressing members 19 for suppressing the end portion 16A of 16 from being exposed to the outside of the sheet 12 are further provided.

The sheet 12 is wound around the core 11 by a plurality of turns, for example, two or more turns. The roll body 10 may or may not include at least one of the first exposure suppressing member 18 and the second exposure suppressing member 19. Further, the roll body 10 includes a pair of first exposure suppressing members 18, but when the first exposure suppressing member 18 is provided, it suffices to include at least one first exposure suppressing member 18. The roll body 10 includes a pair of second exposure suppressing members 19, but when the second exposure suppressing member 19 is provided, it suffices to include at least one second exposure suppressing member 19.

Further, as shown in FIG. 3, the roll body 10 is connected to the first filling portion 14 and has a first intervening portion 20 interposed between the sheet 12 on the first lap and the sheet 12 on the second lap. Further prepared. The roll body 10 includes the first intervening portion 20 as shown in FIG. 3, but does not have to include the first intervening portion as in the roll body 30 shown in FIG.

<< 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 width direction DR1 of the winding core 11. The chuck member is a member for rotatably fixing and holding the roll body 10 with respect to the winding device by being inserted into the hole 11B of the winding core 11. When the winding core is columnar, 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. 2) 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 widths 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 calculating 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 may be 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 should be formed on the outer peripheral surface of the winding core where the sheet contacts so that the position of the winding starting end of the sheet is close to the center of the winding core. 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 the winding core 11 having no step on the above-mentioned portion of the outer peripheral surface 11A, it is possible to cope with 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 contact with the sheet" 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 in the portion of 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. When such a step is formed, there is no problem in use, and the sheet 12 can be easily peeled off from the core 11.

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, processability 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. 2) is not particularly limited, but may be, for example, 0.1 m or more and 50 m or less. As used herein, the "sheet width" means the length of the sheet in the lateral direction (the 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. For example, if the width W2 of the sheet 12 is smaller than the width W1 of the winding core 11 by about 1 mm or more and 50 mm or less, the unused portion is reduced and efficient collection can be performed in the case of product imposition, which is preferable. The lower limit of this difference may be 1 mm or more, 20 mm or more, or 50 mm or more, and the upper limit may be 70 mm or less, 40 mm or less, or 25 mm or less.

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 the sheet in the longitudinal direction DR2 (see FIG. 3). The lower limit of the length of the sheet 12 may be 30 m or more, 40 m or more, or 50 m or more, and the upper limit may be 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. When a thin film is preferred depending on the application, it is not limited to this, and it is preferably 3 μm or more and less than 50 μm, and more 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 at 8 points excluding the maximum value and the minimum value among the measured thicknesses at the 10 points. It should be noted that the above-mentioned 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, the deformation due to the step may be eliminated if the sheet is thin. 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.

When the sheet 12 is a glass film described later, the thickness of the glass film is preferably 5 μm or more and 100 μm or less. When the thickness of the glass film is 5 μm or more, the physical characteristics of the glass can be maintained, and when the thickness is 100 μm or less, the glass film can be easily wound into a roll. The lower limit of the thickness of the glass film may be 10 μm or more, 15 μm or more, or 20 μm or more from the viewpoint that cracks are less likely to occur and even if minute cracks are generated, they are not easily cracked. Further, the upper limit of the thickness of the glass film may be 40 μm or less, 30 μm or less, or 25 μm or less from the viewpoint of lengthening or thinning.

When the sheet 12 is the paper described later, the thickness of the paper is preferably 50 μm or more and 110 μm or less. If the thickness of the paper is 50 μm or more, the strength can be guaranteed for a long period of time, and if it is 110 μm or less, it is easy to wind it into a roll. The lower limit of the thickness of the paper may be 50 μm or more, 60 μm or more, or 70 μm or more from the viewpoint of ease of handling in the process. Further, the upper limit of the thickness of the paper may be 100 μm or less, 90 μm or less, or 80 μm or less from the viewpoint of lengthening the roll.

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 portion 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, further 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 (for example, wallpaper) and the like. The film may be, for example, a resin film or a glass film. As used herein, the term "glass film" means a flexible glass substrate that can be wound into a roll. When a resin film or a glass film is used for an application requiring light transmission (for example, an optical film application), it is preferable that the resin film or the glass film 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 polyamide imide resin, a polyamide resin, or a mixture of two or more of these resins. Among these, a resin film having relatively high flexibility, for example, an acrylic resin, a polyolefin resin, a polyester resin, an acetyl cellulose resin, a polyimide resin, a polyamide imide resin, or a resin film containing a polyamide resin is a resin film. The technique of the present invention is effective because it is easily deformed by the step caused by the winding start end of the sheet and the step caused by the fixing member. Further, in recent years, a low moisture permeability resin having less distortion and low moisture permeability has been preferably used for large displays. In the case of a large display, the entire seat width is often the product, so if any part of the display remains deformed due to a step, 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 a sheet 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.

The in-plane phase difference (alteration: Re) of the sheet 12 is not particularly limited. For example, the in-plane phase difference Re of the sheet 12 may be 1 nm or more and 20000 nm or less. When the sheet 12 is used for an optical film and particularly contains an acrylic resin or a cycloolefin polymer resin, the in-plane retardation Re of the sheet 12 is preferably 10 nm or less. The fact that the in-plane phase difference 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, a new polymer state inside the sheet 12 is caused. It is preferable because a step is less likely to occur. The upper limit of the in-plane phase difference Re of the sheet 12 is more preferably 8 nm or less or 4 nm or less from the viewpoint that color unevenness and blackout, which are problems when used in combination with a polarizing element, 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 does not occur when bent like a conventional acrylic resin film, and the haze value (total haze value) is 1% or less or It is preferably as small as 0.5% 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 due to the internal polymer state are less likely to occur. .. When the sheet 12 contains a polyester resin, stretching is indispensable for obtaining 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, still more preferably 800 nm or less. be. In order to improve the physical characteristics such as the 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, and 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 is preferably 5 or more in that a new step due to the polymer state in the sheet is unlikely to occur particularly in the case of a long roll. , 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 axis direction, which is the direction in which the refractive index is the largest in the plane of the sheet, and the phase advance axis direction, which is the direction orthogonal to the slow axis direction in the plane. It is expressed by the following mathematical formula (1) by the refractive index ny of and the thickness t (nm) of the sheet. From the following 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.
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 above nx and the above 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)
・ Restriction 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 measured separately with an SEM or an optical microscope

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

After that, place the sample 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. However, the sample shall be cut out from a portion (for example, the central portion of the sheet) separated from each end of the sheet by 35 mm or more inside the sheet. If there are multiple samples, they must all be installed in the same orientation. For example, it is preferable to pre-mark all samples so that they are all oriented 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-advancing axis and the slow-phase 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 are 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. 10, 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, one point equidistant from the center A1 in each section, 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. In some base materials, a base layer is formed on one side or both sides of the base material for easy adhesion. The term "base material" as used herein is a concept including not only those having no base layer but also those having a base layer on one side or both sides of the base material. That is, in the present specification, when the base layer is formed on the base material, the laminated body of the base material and the base layer is used as the base material. However, the base layer in this case is a base layer in contact with the base material, and does not include the base layer not in contact with the base material. The film thickness of the base layer is usually 0.01 μm or more and 1.0 μm or less. Further, the "functional layer" in the present specification is a layer intended to exert some function in the laminated body. Specifically, the functional layer includes, for example, a base layer that is not in contact with the substrate, 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, and a special wavelength absorbing layer. Layer, special wavelength transmission layer, color reproduction improvement layer, liquid crystal layer, retardation adjustment layer, viewing angle adjustment layer, reflection layer, coloring layer, antireflection layer (high refractive index layer, low refractive index layer), antifouling layer , Water-repellent layer, oil-repellent layer, etc., or a combination thereof and the like. 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 peeling 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 core 11 with the release liner peeled off.

The use of the sheet 12 is not particularly limited, but is, for example, optical use (optical film use, polarizing plate use, display device use), joinery use, automobile interior decoration use, battery member use, food packaging material use, agricultural use, for example. , Beauty use, design use, medical use, etc. Among these, in the film for optical use, if there is a step caused by the winding start end of the sheet or a step caused by the fixing member, not only the appearance but also the light transmission may be affected. The technique of the present invention 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 winding core 11 side with respect to 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 is the second end surface 17B of the fixing member 17, which will be described later, and the radial DR3 of the winding core 11 ( It is almost aligned in the normal direction of the outer peripheral surface 11A of the winding core 11. As used herein, "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 above "+" means that the tip surface 12A1 protrudes from the second end surface 17B, and the above "-" 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 first end surface 17A and a second end surface 17B on the opposite side of 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. The second end surface 17B is located on the winding start end portion 12A side of the first end surface 17A.

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, the surface of the fixing member 17 is all in close contact with the winding start end portion 12A, but as in the roll body 40 shown in FIG. 9, the winding start end portion 12A is wound with respect to the fixing member 17. If it is fixed to such an extent that it does not cause a problem, for example, if the winding start end portion 12A is fixed to such an extent that it does not peel off from the fixing member 17, the first filling portion 14 or the first filling portion 14 or the first is placed between the winding start end portion 12A and the fixing member 17. 1 The exposure suppressing member 18 may be inserted.

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, wrinkles are not generated on the sheet 12. 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 at the winding start end portion 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 lap, 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 lap, 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. be.

<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 round, and the first end surface 17A of the fixing member 17. be.

<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 lap, and the tip end surface of the winding start end portion. As used herein, the term "filling" means a state in which the gap is largely filled with the material constituting the filling portion. However, there may be a void inside the filling portion.

The sheet 12 has an effective region R1 used as a product (see FIG. 2) and an ineffective region R2 (see FIG. 2) located on both sides of the effective region R1 in the width direction DR1 of the winding core and not used as a product. The first filling portion 14 is present in at least the effective region R1. Since the effective region R1 is a region used as a product, it is preferable that the first filling portion 14 exists in the entire effective region R1 in the width direction DR1 of the winding core 11. Since the non-effective region R2 is a region that is not used as a product in the first place and it is not necessary to alleviate the step, there is no problem even if the first filling portion 14 does not exist in the non-effective region R2. The ineffective region R2 is a region within 10 mm to 30 mm inward from both ends in the width direction of the sheet, although it varies depending on the use of the sheet and the width of the sheet.

The edge thickness T1 (see FIG. 4) of the tip portion 14B 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 new due to this thickness. A thin step is preferable because a large step may be formed. Specifically, for example, the edge thickness T1 is preferably 50 μm or less. The edge thickness T1 is 30 μm or less, 20 μm or less, and 10 μm 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 also the sheet deformation due to the step caused by the fixing member. It may also be 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 portion 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, 35 m or less, 20 m or less, or 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 becomes invisible as described above, but whether or not the step exists is determined as follows. First, in an indoor environment of 800 Lux or more and 2000 Lux or less, a white light source tube such as a white LED lamp or a white phosphor (for example, 40 W type straight tube LED (power consumption 18 W, total light beam 3100 Lm, color temperature)) is attached to a long sheet. 5000K))) is reflected, and if there is a part where the outline of the white light source tube reflected on the sheet is distorted compared to the other parts of the sheet, it is judged that there is a step, and in the vicinity where the step is present. It is judged that there is no step in the part where the contour line of the reflected white light source tube can be judged to be the same as the other parts of the sheet. 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 steps are. Further, if the observation environment is as bright as described above, the white light source tube itself may or may not be lit. When observing, 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 contour line of the white light source tube is easier to see 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 a white light source tube on the back surface side of the base material on which the antiglare layer is not laminated to check whether a step is present. 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 the functional layer is attached to a polarizing element. For example, when an anti-glare layer is laminated on a base material as a functional layer, it is possible to judge by the fact that the uneven shape that exerts the anti-glare function is crushed by pressure and the shadows appear to be colored in the part where the step exists. be. 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 shadows due to the shape change as described above. It is possible to judge 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 sheet 12 is thick. 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. The lower limit of the edge thickness T1 may be 0.1 μm or more, 0.3 μm or more, or 0.5 μm or more.

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, or 1 μm or less. Is preferable. In this case, the lower limit of the edge thickness T1 may be 0.1 μm or more, 0.3 μm or more, or 0.5 μm or more.

On the other hand, there is also an effect due to the presence of the edge thickness T1. For example, the core is often reused after the roll 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 washing 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 to intentionally make the edge thickness T1 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 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 optical interferometry 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 side of the drawn sheet 12, one or more samples having a size of 0.5 mm square or more including the tip portion 14B of the first filling portion 14 are obtained from the sheet. The sample is not limited to a square but may be a rectangle (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 including 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
・ Scan 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 preferably 52 μm or more and 150 μm or less. When it is 3 μm or more and less than 50 μm, the thickness T2 is preferably 50.5 μm or more and 100 μm or less.

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 first intervening portion 20 is present or not. When the first intervening portion 20 is not present, the measurement can be performed using a laser displacement meter or a stereomicroscope, and when the first intervening portion 20 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 the laser beam, 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 width direction DR1 of the winding core 11 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 light source and a light receiving element. The laser light emitted from the laser light 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 meters 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. 11, 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 width direction of the sheet 12 (the width direction DR1 of the winding core 11), and the second position B2 is on the second end 12G2 side opposite to the first end 12G1. Located in. The first laser displacement meter is arranged so that the laser beam is irradiated 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 third laser displacement meter is arranged so that the laser beam is irradiated to the middle point C2 of the position B2, and the laser beam is irradiated to the middle point C3 of the second position B2 and the second end 12G2. 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 is 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 is positioned (mm). ), And a graph (see FIG. 12) with the vertical axis as the displacement amount (mm) is obtained. This measurement is performed from the tip portion 14B of the first filling portion 14 toward the position in contact with the tip surface 12A1. In this measurement, the reference height (displacement amount 0 mm line) is set as the height of the winding core 11, and the reference height is used. 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 14B 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 in contact with the tip surface 12A1 in the first filling portion 14 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.

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 confirm 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 removing 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 of the first filling portion 14 can be maintained satisfactorily.

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 14C (see FIG. 5) of the first filling portion 14 is preferably convex upward. If the shape of the surface 14C 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 14C 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. 12), which is the intersection of the displacement amount 0 mm line and the position displacement curve at the point where the displacement amount starts to increase, is grasped. Then, a virtual line IL3 (see FIG. 12) passing through the positions E1 and E2 is drawn. If the ratio of the number of peaks located above the 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 14C of the first filling portion 14 is If it can be determined that the shape is convex upward, and the ratio of the number of peaks located below 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. , It can be determined that the shape of the first filling portion 14 is concave downward. If the position / displacement curve overlaps with the virtual line IL3, it is determined to be 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 14C 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 based on the virtual line IL3, 7 points of peaks convex above the virtual line IL3 are read, and the values of 5 points excluding the maximum value and the minimum value are averaged. 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 coating material can be filled without dents, and if it is 0.0060 or less, the coating material can be filled without becoming significantly convex. The lower limit of this inclination is preferably 0.0020 or more, 0.0030 or more, or 0.040 or more, and the upper limit is preferably 0.0130 or less, 0.0120 or less, or 0.0100 or less. ..

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 height change in the radial direction DR3 (normal direction of the outer peripheral surface 11A) of the winding core 11 in the sheet 12, so that the winding start end can be suppressed. The step caused by the portion 12A can be alleviated.

If the thickness of the first filling portion changes abruptly, the deformation remains due to the portion where the thickness changes, and there is a possibility that the step caused by the winding start end portion is not 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 first intervening portion 20 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 in 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 in the first interposition portion 20 ((length L1 + length L2) / thickness T2). Is preferably 90 or more. Further, when the first intervening portion 20 does not exist as shown in FIG. 8, the thickness T2 at the position where the first filling portion 14 is in contact with the tip surface 12A1 is located at the position where the first filling portion 14 is in contact with the tip surface 12A1. The ratio (length L1 / thickness T2) of the length L1 (see FIG. 8) 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, 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 in 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 as in the thickness T2. Specifically, first, the existence of the first intervening portion is confirmed by the method described later. When the first 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. 12) that passes through the 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 first 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 above-mentioned 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 above-mentioned deformation relaxation is further achieved. 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 a convex first filling portion on the processing, and there is a possibility that a wavy thickness unevenness may occur in the first filling portion. The upper limit is preferably 100 mm or less from the viewpoint of easily obtaining the first filling portion 14 having a convex shape upward and suppressing the 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 are more appropriately convex upward in the first filling portion 14. In order to represent such a shape, it is preferable to use the area of the first filling portion 14 on a plane including the longitudinal DR2 of the sheet 12 and the radial DR3 of the winding core 11. Specifically, when the first intervening portion 20 is present as shown in FIG. 4, the longitudinal 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 in the first filling portion 14. Area S1 (see FIG. 5) of the region R11 sandwiched between the outer peripheral surface 11A of the winding core 11 and the surface 14C of the first filling portion 14 in the plane including the radial DR3 of the winding core 11 and the outer peripheral surface 11A and the first intervening portion of the winding core 11. The total ratio ((area S1 + area S2) / thickness T2) of the total area S2 (see FIG. 5) of the region R12 sandwiched between the surfaces 20A of 20 is preferably 3.0 or more. The area S1 of the region R11 in FIG. 5 represents the cross-sectional area of the first filling portion 14. Further, the area S2 of the region R12 in FIG. 5 represents the total of the cross-sectional area of the first intervening portion 20, the cross-sectional area of the sheet 12 in the region R12, and the cross-sectional area of the fixing member 17 in the region R2. Note that FIG. 5 shows a state in which the sheet 12 on the first filling portion 14 and the first intervening portion 20 is peeled off to expose the first filling portion 14 and the first intervening portion 20. When the first intervening portion 20 is not present, the outer peripheral surface 11A and the first outer peripheral surface 11A of the winding core 11 in the plane 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 (area S1 / thickness T2) of the region R11 sandwiched by the surface 14C of the filling portion 14 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. The upper limit of these ratios is not particularly limited, but may be, for example, 50.0 or less, or 17.0 or less.

The total area S1 and the area S2 and the area S1 can be obtained 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 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 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 coating 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 formed 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.

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

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 liquids but also materials that change from liquids to solids, solids having fluidity by heating and the like, and curable materials. When the coating material is a curable material, the first filling portion 14 is formed from a cured product of the curable material.

The shear viscosity of the coated 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 coating material while using a spatula or the like to prepare the coating material applied to the core, and to adjust the shape of the coating material before winding the sheet. If you spread it, it will take a lot of time and effort. On the other hand, if the shear viscosity of the coated material is 500 Pa · s or less, the coated 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 coated 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 coating 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 coated material, the coated material protrudes from between the core 11 and the sheet 12 at the time of coating. Is preferable because it can reduce the amount of shearing force. 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 coating material is low, and it is possible to reduce the coating material from squeezing out from between the winding core and the sheet due to the pressure during coating and / or during winding.

The shear viscosity of the coated material can be measured using a dynamic viscoelasticity measuring device (for example, manufactured by Anton Paar Japan Co., Ltd.). Specifically, using a parallel plate having a diameter of 25 mm, the shear viscosity of the coated 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.

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

The coating material preferably does not contain volatile components such as solvents. Since the coating 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.

The coating material is preferably a material having 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 coated 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 which can be applied at the time of forming such a first filling portion but has low fluidity in the state of the roll body 10.

When the coating material is a curable polymer composition, the coating material may be, for example, an ionizing radiation curable polymer composition (ionized radiation curable resin composition or ionizing radiation curable rubber composition), or 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.

Examples of the room temperature curable polymer composition include a two-component curable polymer composition composed of a main agent and a curing agent, and a one-component curable polymer composition that cures with 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 controlling the time 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 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. It is different from the so-called silicone rubber composition and the cured silicone rubber (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 Vulcanization) 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 and the sheet are excellent. 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. Further, since this composition is also excellent in mold 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 because it does not inhibit curing, and the addition reaction curable RTV silicone rubber composition is preferable because the curing shrinkage rate is even smaller. In the present invention, the thickness of the coating material required for alleviating the step tends to be larger as the material has a larger curing shrinkage. 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 liquid silicone rubber LSR (Liquid Silicone Rubber) because it does not require special processing equipment.

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 electric insulator, it may be charged by contact with the 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. , Inorganic fillers such as zinc carbonate, layered mica, carbon black, diatomaceous earth, glass fiber; 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.

In order to allow the coating material to flow to the vicinity of the position (separation position) P1 where the sheet 12 on the first lap is separated 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, but 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 in 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 amount of the coated material to be applied is too small, for example, when applying with a syringe, air may be caught and it may be difficult to discharge the coated material from the syringe, or when the sheet is run and applied, the coating may be 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.

<Second filling part>
The second filling portion 16 is filled in the second gap 15. That is, the second filling portion 16 shown in FIG. 3 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. In addition, a minute gap may exist between the second filling portion 16 and the first end surface 17A.

The second filling portion 16 is composed of a coating material or, if the coating material is a curable polymer composition, a cured product thereof. Since this coating material is the same as the coating material described in the first filling portion 14, the description thereof will be omitted. The coating material may be the same as the coating material described in the first filling portion 14, but may be different.

It is preferable that the thickness of the second filling portion 16 is gradually reduced 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.

<First intervention>
Since the first filling portion tends to be softer than the sheet, if the height at the position where the first filling portion contacts the tip surface of the winding start end 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 first intervening portion 20 is formed, the first intervening portion 20 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 is formed. The step between the corners of the surface 12A1 and the upper surface 12A2 can be reduced. Further, the presence of the first intervening portion 20 can suppress the concentration of stress on the step 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.

It is preferable that the first intervening portion 20 contains a coloring material and a light emitting material, similarly to the first filling portion 14. Since the first intervening portion 20 contains a coloring material or a light emitting material, it is easy to visually recognize when the first intervening portion 20 protrudes from the roll body 10. In addition, it becomes easy to confirm the existence of the first intervening portion 20. Since the coloring material and the light emitting material contained in the first intervening portion 20 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 first intervening portion 20 is colored, it can be easily visually confirmed whether or not the first intervening portion 20 is present. Specifically, first, the sheet 12 is unwound 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 first intervening portion 20 is present, and if there is no colored portion, the first intervening portion 20 is present. It can be judged not to.

Even when the sheet 12 is transparent and the first intervening portion 20 contains a light emitting material, whether or not the first intervening portion 20 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 first intervening portion 20 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 first intervening portion 20 is preferably 2 μm or more and 110 μm or less. When the thickness T3 of the first intervening portion 20 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 first intervening portion 20 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 by 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 first intervening portion 20 is preferably 0.5 μm or more and 50 μm or less. When the thickness T3 of the first intervening portion 20 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 first intervening portion 20 is the maximum thickness of the first intervening portion 20. The thickness T3 of the first intervening portion 20 shall be measured as follows. First, this portion is collected and fixed so that the portion including the winding start end portion 12A, the first intervening portion 20, 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 first intervening portion 20 is measured with a stereomicroscope (for example, product name “Digital Microscope VHX-7000”, manufactured by KEYENCE CORPORATION).

The first intervening portion 20 is composed of a coating material or, if the coating material is a curable polymer composition, a cured product thereof. Since this coating material is the same as the coating material described in the first filling portion 14, the description thereof will be omitted. The coating material may be the same as the coating material described in the first filling portion 14, but may be different.

<First exposure suppression member>
The first exposure suppressing member 18 is a member for suppressing the end portion 14A of the first filling portion 14 in the width direction DR1 of the winding core 11 from being exposed to the outside of the sheet 12. The first exposure suppressing member 18 of the present embodiment is a member for suppressing the end portion 14A of the first filling portion 14 from protruding to the outside of the sheet 12. That is, the first exposure suppressing member 18 functions as a damming member that blocks the end portion 14A of the first filling portion 14 from protruding to the outside of the sheet 12.

The first exposure suppressing member 18 has an end portion of the first filling portion 14 in the width direction DR1 as shown in FIG. 2 in order to prevent the end portion 14A of the first filling portion 14 from protruding to the outside of the sheet 12. It is located outside 14A and is covered by the sheet 12. The first exposure suppressing member 18 is arranged on the outer peripheral surface 11A of the winding core 11.

As shown in FIG. 2, the first exposure suppressing member 18 exists on both sides of the first filling portion 14 in the width direction DR1. As a result, it is possible to prevent the end portions 14A of the first filling portion 14 from protruding to the outside of the sheet 12.

If the first exposure suppressing member is present in the effective region, there will be a portion where the first filling portion does not exist in the effective region of the sheet in the width direction of the winding core, and there will be a portion where the step cannot be effectively reduced. May exist. Therefore, as shown in FIG. 2, it is preferable that the first exposure suppressing member 18 does not exist in the effective region R1 but is located in the non-effective region R2.

When the first filling portion 14 comes into contact with the first exposure suppressing member 18 due to the pressure at the time of winding the sheet 12, the first filling portion 14 tends to move along the first exposure suppressing member 18. Therefore, if the length of the winding core in the first exposure suppressing member in the circumferential direction is short, the first filling portion may wrap around the first exposure suppressing member and protrude. Therefore, it is preferable that the first exposure suppressing member 18 extends along the circumferential direction DR4 (see FIG. 7) of the winding core 11.

In a plan view of the roll body 10 (see FIG. 2), if there is a gap between the end surface on the winding start end side of the first exposure suppression member and the winding start end and the fixing member, the first exposure suppression member causes the first. Although it is possible to generally suppress the protrusion of the end portion of the 1-filled portion, there is a possibility that the end portion of the first filled portion slightly protrudes to the outside of the sheet from this gap. On the other hand, if a part of the first exposure suppressing member 18 overlaps the winding start end portion 12A as shown in FIGS. 2 and 6, the gap is unlikely to be formed, so that the end portion of the first filling portion 14 is difficult to form. It is possible to further prevent the 14A from protruding to the outside of the sheet 12, and it is possible to prevent the end portion of the first intervening portion 20 from protruding to the outside of the sheet 12. The first exposure suppressing member 18 is arranged so that the end surface of the first exposure suppressing member 18 on the winding start end 12A side comes into contact with the tip surface 12A1 of the winding start end 12A and the second end surface 17B of the fixing member 17. However, from the viewpoint that the gap is less likely to be formed due to changes over time and from the viewpoint of suppressing the protrusion of the end portion of the first intervening portion 20, a part of the first exposure suppressing member 18 starts to wind on the end portion 12A. It is preferable to arrange the first exposure suppressing member 18 so as to overlap with the above.

It is preferable that the length L3 (see FIG. 7) of the first exposure suppressing member 18 in the circumferential direction DR4 of the winding core 11 is larger than the maximum length of the first filling portion 14 in the circumferential direction DR4. As a result, it is possible to prevent the first filling portion 14 from wrapping around the first exposure suppressing member 18 and protruding to the outside of the sheet 12. The length L3 of the first exposure suppressing member 18 is preferably 10 mm or more. When the length L3 of the first exposure suppressing member 18 is 10 mm or more, the wraparound of the first exposure suppressing member 18 in the first filling portion 14 can be further suppressed. The lower limit of the length L3 of the first exposure suppressing member 18 is 30 mm or more, 50 mm or more, 60 mm or more, or 90 mm or more from the viewpoint of further suppressing the wraparound of the first exposure suppressing member 18 in the first filling portion 14. Is more preferable. The upper limit of the length L3 of the first exposure suppressing member 18 is preferably less than the outer peripheral length of the winding core 11 from the viewpoint of suppressing the overlap between the first exposure suppressing members 18, for example, the outer peripheral length of the winding core 11. It may be less than or equal to the length obtained by subtracting 10 mm from (mm). If the length L3 of the first exposure suppressing member 18 is equal to or less than the length obtained by subtracting 10 mm from the outer peripheral length (mm) of the winding core 11, the overlap between the first exposure suppressing members 18 can be reliably suppressed, so that the first exposure can be reliably suppressed. It is possible to suppress the step caused by the overlapping of the suppressing members 18. The length of the first exposure suppressing member in the circumferential direction of the winding core is the maximum value and the minimum value among the measured lengths of the first exposure suppressing member in the circumferential direction of the winding core measured at 10 points. It can be obtained by obtaining the arithmetic mean value of the lengths of eight points excluding the value.

The width W4 (see FIG. 7) of the first exposure suppressing member 18 in the width direction DR1 of the winding core 11 is preferably 1 mm or more. If the width W4 of the first exposure suppressing member 18 is 1 mm or more, the first filling portion 14 is first exposed even when the first filling portion 14 gets over the first exposure suppressing member 18 as described later. It can be prevented from stopping on the restraining member 18 and protruding. The lower limit of the width W4 of the first exposure suppressing member 18 is more preferably 5 mm or more, 10 mm or more, or 30 mm or more from the viewpoint of further suppressing the protrusion of the first filling portion 14. The upper limit of the width W4 of the first exposure suppressing member 18 may be 50 mm or less, 20 m or less, and 5 mm or less from the viewpoint of reducing the step mark by the first exposure suppressing member 18. The width of the first exposure suppressing member in the width direction of the winding core is the width of eight points excluding the maximum value and the minimum value among the measured widths of the ten points obtained by measuring the width of the first exposure suppressing member at ten points. It can be calculated by calculating the arithmetic mean value.

If the thickness of the first exposure suppression member is thin, the first filling portion may get over the first exposure suppression member and protrude. Therefore, the thickness T4 (see FIG. 6) of the first exposure suppressing member 18 at the position in contact with the tip surface 12A1 is equal to or larger than the thickness T2 (see FIG. 4) of the first filling portion 14 at the position in contact with the tip surface 12A1. It is preferable to have. As a result, it is possible to prevent the first filling portion 14 from overcoming the first exposure suppressing member 18 and protruding.

The thickness T4 of the first exposure suppressing member 18 at a position in contact with the tip surface 12A1 is preferably 50 μm or more and 5000 μm or less. When the thickness T4 of the first exposure suppressing member 18 is 50 μm or more, overcoming of the first exposure suppressing member 18 in the first filling portion 14 can be further suppressed. Further, when the thickness T4 of the first exposure suppressing member 18 is 5000 μm or less, it is possible to suppress the occurrence of a new step caused by the first exposure suppressing member 18. The lower limit of the thickness T4 of the first exposure suppressing member 18 is more preferably 100 μm or more, 300 μm or more, or 500 μm or more from the viewpoint of further suppressing overcoming of the first exposure suppressing member 18 in the first filling portion 14. The upper limit of the thickness T4 of the first exposure suppressing member 18 is more than 3000 μm, 2000 μm or less, or 1000 μm or less from the viewpoint of further suppressing the occurrence of a new step caused by the first exposure suppressing member 18. preferable.

The storage elastic modulus of the first exposure suppressing member 18 at 25 ° C. is preferably equal to or less than the storage elastic modulus of the first filling portion 14 at 25 ° C. If the storage elastic modulus of the first exposure-suppressing member is high, a gap may be created between the first exposure-suppressing member and the winding core in the vicinity of the winding start end, and the first filling portion may flow out from this gap. However, if the storage elastic modulus of the first exposure suppressing member 18 is equal to or less than the storage elastic modulus of the first filling portion 14, it is possible to prevent the first filling portion 14 from flowing out.

The storage elastic modulus of the first exposure suppressing member 18 at 25 ° C. is preferably 0.001 MPa or more and 5 MPa or less. When the storage elastic modulus of the first exposure suppression member 18 is 0.001 MPa or more, it is possible to further suppress the flowout of the first exposure suppression member 18, and the storage elastic modulus of the first exposure suppression member 18 at 25 ° C. When it is 5 MPa or less, it is possible to suppress the formation of a gap between the first exposure suppressing member 18 and the winding core 11 in the vicinity of the winding start end portion 12A. The lower limit of the storage elastic modulus of the first exposure suppressing member 18 is preferably 0.001 MPa or more, 0.005 MPa or more, or 0.01 MPa or more. The upper limit of the storage elastic modulus of the first exposure suppressing member 18 is preferably 3 MPa or less, 1 MPa or less, or 0.5 MPa or less.

The storage elastic modulus of the first exposure suppressing member 18 at 25 ° C. can be measured using a dynamic viscoelasticity measuring device (for example, manufactured by Anton Paar Japan Co., Ltd.). Specifically, first, a sample having a diameter of 10 mm is cut out from the first exposure suppressing member. If a sample having a diameter of 10 mm cannot be cut out from the first exposure suppressing member, a sample having a diameter of 10 mm is prepared using the same material as the material constituting the first exposure suppressing member. Then, this sample is fixed to a parallel plate having a diameter of 8 mm, and in an environment of a temperature of 25 ° C. and a relative humidity of 30% to 70%, a vibration frequency of 1 [rad / s] is used using a dynamic viscoelastic modulus measuring device. Measure the storage modulus at time. The storage elastic modulus of the first filling portion 14 can be measured in the same manner as the storage elastic modulus of the first exposure suppressing member 18.

The density of the first exposure suppressing member 18 at 25 ° C. is preferably equal to or higher than the density of the first filling portion 14 at 25 ° C. If the density of the first exposure suppressing member is low, the first filling portion may seep out from the first exposure suppressing member, but the density of the first exposure suppressing member 18 is lower than the density of the first filling portion 14. If there is, it is possible to suppress such exudation of the first filling portion 14.

The density of the first exposure suppressing member 18 at 25 ° C. is preferably 0.01 g / cm ³ or more. When the density of the first exposure suppressing member 18 at 25 ° C. is 0.01 g / cm ³ or more, it is possible to prevent the first filling portion 14 from seeping out from the first exposure suppressing member 18. The lower limit of the density of the first exposure suppressing member 18 at 25 ° C. is more preferably 0.03 g / cm ³ or more, 0.05 g / cm ³ or more, or 0.1 g / cm ³ or more. The upper limit of the density of the first exposure suppressing member 18 at 25 ° C. is 0.5 g / cm ³ or less, 0.4 g / cm from the viewpoint of suppressing the first exposure suppressing member 18 from triggering the deformation of the sheet 12. It may be ³ or less, or 0.3 g / cm ³ or less.

The density of the first exposure suppressing member 18 at 23 ° C. can be measured as follows. First, a sample having a size of 1 cm × 1 cm is cut out from the first exposure suppressing member. If a sample having the above size cannot be cut out from the first exposure suppressing member, a sample having a size of 1 cm × 1 cm is obtained by using the same material as the material constituting the first exposure suppressing member. Then, in an environment of a temperature of 23 ° C. and a relative humidity of 30% to 70%, the mass and thickness of this sample are measured, and the density is obtained from the mass (g) / thickness (cm). The density of the first filling portion 14 at 23 ° C. can be measured in the same manner as the density of the first exposure suppressing member 18.

Although one first exposure suppressing member 18 shown in FIG. 2 is provided on each side of the first filling portion 14, two or more of each may be provided. By providing two or more first exposure suppressing members 18 respectively, it is possible to further prevent the first filling portion 14 from overcoming the first exposure suppressing member 18.

The constituent material of the first exposure suppressing member 18 is not particularly limited as long as it is a material that does not adversely affect the sheet, and is, for example, resin, metal, rubber, gel, tape (including cushion tape), clay, or paper. Can be mentioned. These materials are easy to handle and / or easy to install. Among these, resins and tapes are preferable because they are easy to handle and install. Further, when rubber or gel is used as the constituent material of the first exposure suppressing member 18, since the first exposure suppressing member 18 itself is deformable, a new step caused by the first exposure suppressing member 18 is created. It can be suppressed from occurring.

The resin may be a thermoplastic resin or a cured product of a curable resin composition. When the resin is a cured product of the curable resin composition, the shape can be freely changed before the curable resin composition is cured, so that a new step due to the first exposure suppressing member 18 is generated. It can be suppressed.

The thermoplastic resin is not particularly limited, and examples thereof include polyolefins (for example, polyethylene, polypropylene, etc.), polyvinyl chloride, polystyrene, polyurethane, ABS resin, acrylic resin, and the like. Among these, polyurethane is preferable from the viewpoint of high exposure suppressing effect. Polyurethane may be in either gel or foam form, for example.

Examples of the curable resin composition include an ionizing radiation curable resin composition that cures with ultraviolet rays or an electron beam, a thermosetting resin composition, and a room temperature curable resin composition that cures at room temperature of about 20 ° to 30 ° C. , Catalytic curable resin composition that cures with a catalyst, anaerobic curable resin composition and the like. Since the ionizing radiation curable resin composition needs to be irradiated with ultraviolet rays or electron beams after coating, the thermosetting resin composition, the catalytic curable resin composition, and the anaerobic curable resin composition are easy to cure. Etc. are preferable.

The tape may be a tape having an adhesive on both sides, a tape having an adhesive on only one side, or a tape having no adhesive. When the tape has the adhesive on both sides or only on one side, the adhesive may be provided not only on the entire surface but also partially. From the viewpoint of suppressing contamination of the sheet 12, a tape having no adhesive is preferable, but in this case, a tape having no adhesive is sandwiched between the core and the sheet on the first lap. Therefore, it becomes a little difficult in the process. For this reason, it is preferable to partially provide the adhesive.

Since the sheet is used for optical purposes, for example, it is preferable that the paper is one that does not easily generate paper dust, for example, clean paper.

<Second exposure suppression member>
The second exposure suppressing member 19 is a member for suppressing the end portion 16A of the second filling portion 16 in the width direction DR1 of the winding core 11 from being exposed to the outside of the sheet 12. The second exposure suppressing member 19 of the present embodiment is a member for suppressing the end portion 16A of the second filling portion 16 from protruding to the outside of the sheet 12. That is, the second exposure suppressing member 19 functions as a damming member that blocks the end portion 16A of the second filling portion 16 from protruding.

The second exposure suppressing member 19 has an end portion 16 of the second filling portion 16 in the width direction DR1 as shown in FIG. 2 in order to prevent the end portion 16A of the second filling portion 16 from protruding to the outside of the sheet 12. It is located outside 16A and is covered by the sheet 12.

The second exposure suppressing member 19 shown in FIG. 2 exists on both sides of the second filling portion 16 in the width direction DR1. As a result, it is possible to prevent the end portions 16A of the second filling portion 16 from protruding to the outside of the sheet 12.

It is preferable that the second exposure suppressing member 19 does not exist in the effective region R1 but is located in the non-effective region R2 for the same reason as described in the column of the first exposure suppressing member 18. The second exposure suppressing member 19 is preferably extended along the circumferential direction DR4 of the winding core 11 for the same reason as described in the column of the first exposure suppressing member 18.

In the plan view of the roll body 10 (see FIG. 2), if there is a gap between the end surface of the second exposure suppressing member on the fixing member side and the first end surface of the fixing member, the second filling portion is provided by the second exposure suppressing member. Although it is possible to generally suppress the protrusion of the end portion of the second filling portion, the end portion of the second filling portion may slightly protrude to the outside of the sheet from this gap. On the other hand, when a part of the second exposure suppressing member 19 overlaps the fixing member 17 as shown in FIGS. 2 and 6, the gap is unlikely to be formed, so that the end portion 16A of the second filling portion 16 is formed. It is possible to further suppress the protrusion to the outside of the sheet 12. The second exposure suppressing member 19 may be arranged so that the end surface of the second exposure suppressing member 19 on the fixing member 17 side comes into contact with the first end surface 17A of the fixing member 17, but the above gap may be caused by a change with time or the like. It is preferable to arrange the second exposure suppressing member 19 so that a part of the second exposure suppressing member 19 overlaps with the fixing member 17 from the viewpoint that it is difficult to form the second exposure suppressing member 19.

It is preferable that the length L4 (see FIG. 7) of the second exposure suppressing member 19 in the circumferential direction DR4 of the winding core 11 is larger than the maximum length of the second filling portion 16 in the circumferential direction DR4. As a result, it is possible to prevent the second filling portion 16 from wrapping around the second exposure suppressing member 19 and protruding. Further, since the second gap 15 is smaller than the first gap 13, the second filling portion 16 is less likely to protrude than the first filling portion 14. Therefore, the length L4 of the second exposure suppressing member 19 may be shorter than the length L3 of the first exposure suppressing member 18.

The length L4 of the second exposure suppressing member 19 is preferably 1 mm or more. When the length L4 of the second exposure suppressing member 19 is 1 mm or more, the wraparound of the second exposure suppressing member 19 in the second filling portion 16 can be further suppressed. The lower limit of the length L4 of the second exposure suppressing member 19 is more preferably 5 mm or more, 10 mm or more, or 50 mm or more from the viewpoint of further suppressing the wraparound of the second exposure suppressing member 19 in the second filling portion 16. .. The upper limit of the length L4 of the second exposure suppressing member 19 is preferably less than the outer peripheral length of the winding core 11 from the viewpoint of suppressing the overlap between the second exposure suppressing members 19, for example, the outer peripheral length of the winding core 11. It may be less than or equal to the length obtained by subtracting 10 mm from (mm). If the length L4 of the second exposure suppressing member 19 is equal to or less than the length obtained by subtracting 10 mm from the outer peripheral length (mm) of the winding core 11, the overlap between the second exposure suppressing members 19 can be reliably suppressed, so that the second exposure can be reliably suppressed. It is possible to suppress the step caused by the overlapping of the suppressing members 19. The length of the second exposure suppressing member in the circumferential direction of the winding core is the maximum value and the minimum value among the 10 measured lengths obtained by measuring the length of the second exposure suppressing member in the circumferential direction of the winding core at 10 points. It can be obtained by obtaining the arithmetic mean value of the lengths of eight points excluding the value.

The width W5 (see FIG. 7) of the second exposure suppressing member 19 in the width direction DR1 of the winding core 11 is 1 mm or more for the same reason as described in the column of the first exposure suppressing member 18. preferable. The lower limit of the width W5 of the second exposure suppressing member 19 is more preferably 5 mm or more, 10 mm or more, or 20 mm or more from the viewpoint of further suppressing the protrusion of the second filling portion 16. When the width W5 of the second exposure suppressing member 19 is large, the second exposure suppressing member 19 may enter the effective region R1 and a step may be generated due to the influence of the second exposure suppressing member 19 itself. However, even if the width W5 of the second exposure suppression member 19 is large, if the second exposure suppression member 19 is exposed to the outside of the sheet 12 so that the second exposure suppression member 19 does not enter the effective region R1, the second exposure suppression member 19 is exposed. 2 It is possible to suppress the step caused by the exposure suppressing member 19. Further, by exposing the second exposure suppressing member 19 to the outside of the sheet 12, the protrusion of the second filling portion 16 can be further suppressed. Therefore, the upper limit of the width W5 of the second exposure suppressing member 19 may be 35 mm or less, 30 mm or less, or 25 mm or less. For the width of the first exposure suppressing member, the width of the second exposure suppressing member is measured at 10 points, and the arithmetic mean value of the width of 8 points excluding the maximum value and the minimum value is obtained from the measured widths of the 10 points. Can be obtained by.

The thickness of the second exposure suppressing member 19 is preferably equal to or greater than the thickness of the second filling portion 16 for the same reason as described in the column of the first exposure suppressing member 18. The thickness of the second exposure suppressing member 19 is preferably 5 μm or more and 5000 μm or less. When the thickness of the second exposure suppressing member 19 is 5 μm or more, it is possible to further suppress overcoming of the second exposure suppressing member 19 in the second filling portion 16. Further, when the thickness of the second exposure suppressing member 19 is 5000 μm or less, it is possible to suppress the occurrence of a new step caused by the second exposure suppressing member 19. The lower limit of the thickness of the second exposure suppressing member 19 is more preferably 10 μm or more, 50 μm or more, or 100 μm or more from the viewpoint of further suppressing overcoming of the second exposure suppressing member 19 in the second filling portion 16. The upper limit of the thickness of the second exposure suppressing member 19 is more preferably 3000 μm or less, 2000 μm or less, or 1000 μm or less from the viewpoint of further suppressing the generation of a new step caused by the second exposure suppressing member 19. .. For the thickness of the second exposure suppressing member, the thickness of the second exposure suppressing member is measured at 10 points, and the arithmetic mean value of the lengths of 8 points excluding the maximum value and the minimum value is obtained from the measured thicknesses of the 10 points. It can be obtained by.

The storage elastic modulus of the second exposure suppression member 19 at 25 ° C. may be equal to or less than the storage elastic modulus of the second filling portion 16 at 25 ° C. for the same reason as described in the column of the first exposure suppression member 18. preferable.

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

The density of the second exposure suppressing member 19 at 25 ° C. is preferably equal to or higher than the density of the second filling portion 16 at 25 ° C. for the same reason as described in the column of the first exposure suppressing member 18.

The density of the second exposure suppressing member 19 at 25 ° C. is preferably 0.01 g / cm ³ or more. When the density of the second exposure suppressing member 19 is 0.01 g / cm ³ or more, it is possible to prevent the second filling portion 16 from seeping out from the second exposure suppressing member 19. Further, when the density of the second exposure suppressing member 19 is 0.01 g / cm ³ or more, the deformation of the second exposure suppressing member 19 due to the winding pressure can be suppressed, so that the protrusion of the second filling portion 16 can be suppressed. The lower limit of the density of the second exposure suppressing member 19 at 23 ° C. is more preferably 0.03 g / cm ³ or more, 0.05 g / cm ³ or more, or 0.1 g / cm ³ or more. The upper limit of the density of the second exposure suppressing member 19 at 25 ° C. is 0.5 g / cm ³ or less, 0.4 g / cm ³ or less, from the viewpoint of suppressing the second exposure suppressing member 19 from triggering deformation. Alternatively, it may be 0.3 g / cm ³ or less. The densities of the second exposure suppressing member and the second filling portion at 25 ° C. can be measured by the same method as the density of the first exposure suppressing member.

The constituent material of the second exposure suppressing member 19 is not particularly limited as long as it is a material that does not adversely affect the sheet, and examples thereof include the same material as the first exposure suppressing member 18.

<< 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 the radial DR3 of the winding core 11, but the roll body 50 shown in FIG. As described above, 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 filling portion 16 is filled in the second gap 15, 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 circumference, and is located on the second end surface 17B side. The third filling portion 52 may be filled in the three gaps 51, and a third exposure suppressing member 53 (see FIG. 14) may be provided on the outside of the third filling portion 52 in the width direction DR1 of the winding core 11. ..

<Third gap>
The third gap 51 is a gap in contact with the second end surface 17B of the fixing member 17. Specifically, the third gap 51 shown in FIG. 13 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 round, and the second end surface 17B of the fixing member 17. be.

<Third filling part>
Since the third filling portion 52 is the same as the second filling portion 16 except that the third gap 51 is filled, the description thereof will be omitted here.

<Third exposure suppression member>
The third exposure suppressing member 53 is the same as the second exposure suppressing member 19 except that the third exposure suppressing member 53 is provided on the outside of the third filling portion 52 in the width direction DR1 of the winding core 11, and thus the description thereof is omitted here. It shall be.

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. Since it is sufficient that 14 is filled, the second filling portion 16 may not be filled in the second gap 15 as in the roll body 60 shown in FIG. The roll body 60 has a hollow second gap 15. In this case, since the second gap 15 of the roll body 60 is hollow, the second filling portion does not protrude. Therefore, as shown in FIG. 16, it is not necessary to provide the second exposure suppressing member 19.

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 70 shown in FIG. The roll body 70 has a hollow first gap 13. In this case, since the first gap 13 of the roll body 60 is hollow, the first filling portion does not protrude. Therefore, as shown in FIG. 18, it is not necessary to provide the first exposure suppressing member 18.

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 80 shown in FIG. 19, in addition to the fixing member 17, the fixing member 81 is provided on the first end surface 17A side of the fixing member 17. In the roll body 80 shown in FIG. 19, 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 51 is filled with the third filling portion 52. In this case, it is preferable that the third exposure suppressing member 53 (see FIG. 20) is provided on the outside of the third filling portion 52 in the width direction DR1 of the winding core 11.

Similarly, in the roll body 80 shown in FIG. 19, in order to suppress the step caused by the fixing member 81, the second gap 82 on the first end surface 81A side of the fixing member 81, which will be described later, has a second gap. It is preferable that the filling portion 83 is filled, and that the third gap 84 on the second end surface 81B side of the fixing member 81, which will be described later, is filled with the third filling portion 85. In this case, the second exposure suppressing member 86 (see FIG. 20) is provided on the outside of the second filling portion 83 in the width direction DR1 of the winding core 11, and the third exposure is provided on the outside of the third filling portion 85. It is preferable that the restraining member 87 (see FIG. 20) is provided.

<Fixing member>
The fixing member 81 has a first end surface 81A and a second end surface 81B opposite to the first end surface 81. Both the first end surface 81A and the second end surface 81B extend in the width direction DR1 of the winding core 11. The second end surface 81B is located on the winding start end portion 12A side with respect to the first end surface 81A. Since the fixing member 81 is the same as the fixing member 17, the description thereof will be omitted here.

<Second gap>
The second gap 82 is a gap in contact with the first end surface 81A of the fixing member 81. Specifically, the second gap 82 shown in FIG. 19 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 round, and the first end surface 81A of the fixing member 81. be.

<Third gap>
The third gap 84 is a gap in contact with the second end surface 81B of the fixing member 81. Specifically, the third gap 84 shown in FIG. 19 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 round, and the second end surface 81B of the fixing member 81. be.

<2nd filling part and 3rd filling part>
Since the second filling portion 83 is the same as the second filling portion 16 except that the second gap 82 is filled, the description thereof will be omitted here. Since the third filling portion 85 is the same as the second filling portion 16 except that the third gap 84 is filled, the description thereof will be omitted here.

<Second exposure suppression member and third exposure suppression member>
The second exposure suppressing member 86 is the same as the second exposure suppressing member 19 except that it is provided on the outside of the second filling portion 83 in the width direction DR1 of the winding core 11, so the description thereof is omitted here. And. The third exposure suppression member 87 is the same as the second exposure suppression member 19 except that it is provided on the outside of the third filling portion 85 in the width direction DR1 of the winding core 11, so the description thereof is omitted here. And.

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 90 shown in FIGS. 21 and 22.

13, FIG. 15, FIG. 19, and FIG. 21 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 50, 60, 80, and 90 show. , Length L1 to Length L4, Thickness T2 to Thickness T4, (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 50, 60, 80, and 90 all include the first intervening portion 20, but like the roll body 30 shown in FIG. 8, it is not necessary to include the first intervening portion.

In FIG. 15, the surface of the fixing member 17 is all in close contact with the winding start end portion 12A, but similarly to the roll body 40 shown in FIG. 9, the first winding start end portion 12A and the fixing member 17 are located. 1 The filling portion 14 and the first exposure suppressing member 18 may be inserted.

In the roll bodies 10, 50, 60, 80, 90, the first exposure suppressing member 18 is arranged on the outer peripheral surface 11A of the winding core 11, but as shown in FIGS. 23 and 24, the first exposure suppressing member 18 is arranged. The member 101 may be arranged on the seat 12 side. In the roll body 100 shown in FIGS. 23 and 24, the first exposure suppressing member 101 is located outside the end portion 14A of the first filling portion 14 in the width direction DR1 and is covered with the sheet 12. Is arranged on the back surface 12C of the sheet 12 instead of the outer peripheral surface 11A of the winding core 11. Specifically, on the back surface 12C of the sheet 12, side tapes extending along the longitudinal direction DR2 are attached to both ends located in the width direction of the sheet 12 (the width direction DR1 of the winding core 11). A part of the side tape is the first exposure suppressing member 101. Since both ends of the sheet 12 exist in the ineffective region R2, there is no problem in the product even if such a side tape is attached. The side tape is not particularly limited, and examples thereof include side tapes for optical films.

In the roll body 100 shown in FIGS. 23 and 25, the second exposure suppressing member 102 is located outside the end portion 16A of the second filling portion 16 in the width direction DR1 and is covered with the sheet 12. Is arranged on the back surface 12C of the sheet 12 instead of the outer peripheral surface 11A of the winding core 11. The second exposure suppressing member 102 is also a part of the side tape.

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

In the roll body 10, the second filling portion 16 is filled in the second gap 15, but the second filling portion 16 is filled in the second gap 15 as in the roll body 110 shown in FIG. 27. Instead, the second gap 15 may be hollow, and the second intervening portion 111 may be provided in the region 12D corresponding to at least the second gap 15 between the sheets 12 after the first lap. In this case, it is preferable that the exposure suppressing member 112 (see FIG. 26) is provided on the outside of the end portion 111A of the second intervening portion 111 in the width direction DR1 of the winding core 11.

<Second intervening part>
The second intervening portion 111 is provided between the seats 12 after the first lap. Therefore, the sheet 12 is always present on the second intervening portion 111. The second intervening portion 111 extends in the width direction DR1 of the winding core 11.

The maximum thickness T5 (see FIG. 28) of the second intervening portion 111 is preferably 0.01 mm or more. When the maximum thickness T5 of the second intervening portion 111 is 0.01 mm or more, the step caused by the fixing member 17 can be effectively alleviated. The maximum thickness T5 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 T5 is too thick, the step caused by the fixing member can be alleviated, but the winding of the sheet 12 may be adversely affected. Therefore, the upper limit of the maximum thickness T5 is preferably 0.2 mm or less or 0.1 mm or less. The maximum thickness T5 of the second intervening portion 111 can be measured by the same method as the thickness T2 using a laser displacement meter or a stereomicroscope.

When the thickness of the second intervening portion 111 is measured along the longitudinal direction DR2 of the sheet 12, the tip 111B to the second intervening portion 111 of the second interposing portion 111 in the longitudinal direction DR2 with respect to the maximum thickness T5 of the second interposing portion 111. The ratio (length L5 / maximum thickness T5) of the length L5 (see FIG. 28) to the position where the maximum thickness T5 is reached is preferably 12 or more. When this ratio is 12 or more, it is possible to suppress the deformation remaining in the vicinity of the tip 111B of the second intervening portion 111, and when the thickness of the second intervening portion is too thick, the roll body 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 111 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, such new deformation may occur. Can be suppressed. 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 T5 of the second intervening portion 111 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 L5 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 L5 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 L5 is too long, a second intervening portion having a convex surface is formed in the region R3 (see FIG. 28) from the tip 111B of the second intervening portion 111 to the position where the maximum thickness is T5. The upper limit of the length L5 is such that the surface 111C of the second intervening portion 111 in the region R3 tends to be convex and the wavy thickness is the upper limit of the length L5. From the viewpoint of suppressing unevenness, it is preferably 20 mm or less.

The length L5 can be obtained from the graph of the position displacement curve in the same manner as the maximum thickness T5. Specifically, first, since the displacement amount increases when the tip 111B of the second intervening portion 111 exists, the intersection of the displacement amount 0 mm line and the position displacement curve at the position where the displacement amount starts to increase from the graph of the position displacement curve. Find the first position that is. 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 L5 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 L5 / maximum thickness T5 can roughly represent the shape of the second intervening portion 111, but in order to more appropriately represent the convex shape of the surface 111C, the cross-sectional area of the second interposing portion 111 is further expressed. It is preferable to use. Specifically, the maximum thickness T5 is obtained from the tip 111B in the plane (plane represented by FIG. 28) including the longitudinal DR2 of the sheet 12 and the radial DR3 of the winding core 11 with respect to the maximum thickness T5 of the second intervening portion 111. It is preferable that the ratio (cross-sectional area S3 / maximum thickness T5) of the cross-sectional area S3 (see FIG. 28) of the second intervening portion 111 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 111 is larger than the maximum thickness T5, so that the sheet 12 can be effectively lifted by the second intervening portion 111, whereby the step is described above. Can be more relaxed. The lower limit of the cross-sectional area S3 / maximum thickness T5 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 above-mentioned step. It is preferably 6.5 or more, or 7.0 or more. The upper limit of the cross-sectional area S3 / maximum thickness T5 is not particularly limited, but may be, for example, 20.0 or less, 17.5 or less, 15.0 or less, 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 111 (in FIG. 28, the cross-sectional area of the region of the second intervening portion 111 surrounded by the solid line), 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.

Since the constituent material of the second intervening portion 111 is the same as the constituent material of the second filling portion 16, the description thereof will be omitted here.

<Exposure suppression member>
The exposure suppression member 112 integrates a first exposure suppression member that suppresses exposure of the end portion 14A of the first filling portion 14, and a second exposure suppression member that suppresses exposure of the end portion 111A of the second intervening portion 111. It is an exposure. Since the first portion 112A corresponding to the first exposure suppressing member in the exposure suppressing member 112 shown in FIG. 29 is the same as the first exposure suppressing member 18, the description thereof will be omitted here. The second portion 112B corresponding to the second exposure suppressing member in the exposure suppressing member 112 shown in FIG. 29 corresponds to at least the second gap 15 between the sheets 12 provided with the second intervening portion 111 (FIG. 29). 29), which is the same as that of the second exposure suppressing member 19 except that the winding core 11 is provided outside the end portion 111A of the second intervening portion 111 in the width direction DR1. Shall be omitted. The exposure suppression member 112 is divided into a first exposure suppression member that suppresses the exposure of the end portion 14A of the first filling portion 14, and a second exposure suppression member that suppresses the exposure of the end portion 111A of the second intervening portion 111. You may be.

<< Manufacturing method of roll body >>
The roll body 10 can be manufactured, for example, by the following method. 30 to 33 are views schematically showing the manufacturing process of the roll body according to the present embodiment. First, as shown in FIG. 30A, 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. 30B, the second winding core 11 is located at the position of the outer peripheral surface 11A of the winding core 11 corresponding to the ineffective region R2 of the sheet 12 along the circumferential direction DR4 of the winding core 11. The exposure suppression members 19 are arranged respectively. The second exposure suppressing member 19 is arranged so that a part of the second exposure suppressing member 19 overlaps the fixing member 17. The second exposure suppressing member 19 may be arranged so as to come into contact with the first end surface 17A of the fixing member 17. Further, the second exposure suppressing member 19 may be arranged by coating using a coating device such as a dispenser or a syringe, or may be arranged by attaching a sheet or tape.

After arranging the second exposure suppressing member 19, a coating device such as a dispenser or a syringe is used between the second exposure suppressing members 19 along the width direction DR1 of the winding core 11 as shown in FIG. 31 (A). The coating material 201 is applied to the outer peripheral surface 11A of the winding core 11. The coating material 201 is applied so as to come into contact with the first end surface 17A of the fixing member 17. The coating material 201 may be coated so as to be close to the first end surface 17A of the fixing member 17.

After applying the coating material 201, the winding start end 12A is arranged so that the sheet 12 covers the coating material 201 as shown in FIG. 31 (B). Specifically, the winding start end portion 12A of the sheet 12 is attached to the fixing member 17, and the winding start end portion 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 fixing member 17, the winding core 11 is located at the position of the outer peripheral surface 11A of the winding core 11 corresponding to the ineffective region R2 of the sheet 12 as shown in FIG. 32 (A). The first exposure suppressing member 18 is arranged along the circumferential direction DR4 of the above. The first exposure suppressing member 18 is arranged not only at the position where the first gap 13 is formed but also at the position on the winding start end portion 12A. The first exposure suppressing member 18 may be arranged by coating using a coating device such as a dispenser or a syringe, or may be arranged by attaching a sheet or tape.

After forming or arranging the first exposure suppressing member 18, using a coating device such as a dispenser or a syringe, the effective region R1 of the sheet 12 between the first exposure suppressing members 18 as shown in FIG. 32 (B). The coating material 202 is applied to the position of the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11. The coating material 202 is applied so as to come into contact with the second end surface 17B of the fixing member 17. The coating material 202 may be coated so as to be close to the second end surface 17B of the fixing member 17.

After that, as shown in FIG. 33, the sheet 12 is wound along the outer peripheral surface 11A of the winding core 11. When the sheet 12 is wound, the coating materials 201 and 202 flow and spread, so that the coating material 202 is filled in the first gap 13 and the coating material 201 is filled in the second gap 15, and the first gap 13 is filled. A second filling portion 16 filled in the filled first filling portion 14 and the second gap 15 is formed. As a result, the roll body 10 is obtained. In order to surely spread the coating material 202 or the like in the first gap 13 or the like and fill it, if the sheet 12 exceeds 1000 m, the sheet 12 is wound 1000 m or more, and if the sheet 12 is less than 1000 m. , 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 the humidity in the air and is cured by being left 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.

In each of the above manufacturing methods, the coating materials 201 and 202 are flowed by winding the sheet 12, but the coating materials 201 and 202 may be flowed in advance before the sheet 12 is wound. However, if the coating materials 201, 202 and the like are flowed before winding the sheet 12, the number of steps increases, so it is preferable to flow the coating materials 201, 202 by winding the sheet 12.

In the above, the coating material 202 is applied after the coating material 201 is applied, but for example, the coating materials 201 and 202 may be applied 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 first end surface 17A, and the coating material 202 is applied so as to be in contact with the second end surface 17B. When the viscosity of the material is low, when it is applied so as to be in contact with the first end face or the second end face, the coated material infiltrates 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 wetting and spreading, it will be hardened at an uncontrollable position, and as a result, a new step may be generated. In addition, when the viscosity of the coating material is high (for example, a tape-like material) or the wettability of the coating material is low, when the coating material or the coating material is placed, it cures in a state where it wets and spreads only in the vicinity of the placement. Since there is a high possibility that if the material is not sufficiently wet and spread by the winding in the subsequent process, many materials will be hardened in a state where the vicinity of the winding start end is thick, and there is a possibility that the step will be rather large. Therefore, the coating material 201 is preferably applied so as to be close to the first end surface 17A of the fixing member 17, and the coating material 202 may be applied so as to be close to the second end surface 17B 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 the viscosity of the coated 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, so it is preferable that the separation distance is short. When the viscosity of the coating material is low, if the separation distance is too small, the coating material is on the fixing member. If the separation distance is too large, the separation distance may not be sufficiently filled in the target gap because it spreads in another direction. Therefore, the separation distance is not too small and not 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 material 201 is applied so as to come into contact with the first end surface 17A of the fixing member 17, and then the second end surface 17B of the fixing member 17 is coated. Although the coating material 202 is applied so as to come into contact with each other, the coating materials 201 and 202 may be applied and the fixing members 17 may be arranged in the order of the following manufacturing methods (1) to (3). Among these, the following production method (2) is preferable.

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 first end surface 17A 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 second end surface 17B 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. The coating material 202 is applied to the side of the fixing member 17 opposite to the coating material 201 so that the distance between the two is the above distance, or after the coating material 202 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 fixing member 17 is the above-mentioned separation distance, and then the coating material 201 is placed on the opposite side of the fixing member 17 from the coating material 202 so that the distance from the fixing member 17 is the above-mentioned separation distance. It is a method of applying. 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 is possible to prevent the fixing member 17 from being formed, it is possible to prevent a new step from being generated 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 producing the roll body 110 shown in FIG. 26, first, the sheet 12 is fixed to the fixing member 17, and then the sheet 12 is located from the position of the outer peripheral surface 11A of the winding core 11 corresponding to the ineffective region R2 of the sheet 12. An exposure suppressing member is arranged along the circumferential direction DR4 of the winding core 11 over the non-effective region R2 of the above. The exposure suppression member 112 is arranged so that a part of the exposure suppression member 112 overlaps the fixing member 17. Further, the exposure suppressing member 112 may be arranged by coating using a coating device such as a dispenser or a syringe, or may be arranged by attaching a sheet or tape. Then, the coating material 201 is applied to the region between the exposure suppressing members 112 corresponding to at least the second gap 15 of the effective region R1 of the sheet 12 along the width direction DR1 of the winding core 11, and the exposure suppressing member is also applied. The coating material 202 is applied so as to come into contact with the second end surface 17B of the fixing member 17 between 112. After that, the sheet 12 is wound to form the first filling portion 14 and the second intervening portion 111.

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. It can be lifted gently. Thereby, the step caused by the winding start end portion 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 30, since the third filling portion 32 is filled in the third gap 31, the portion of the sheet 12 on the first lap on the third filling portion 32 can be gently lifted. This makes it possible to more effectively alleviate the step caused by the fixing member 17.

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 81 can be alleviated, so that the deformation of the sheet 12 can be suppressed. As a result, seat loss can be reduced.

According to the present embodiment, since the first exposure suppressing members 18 and 101 are arranged on the outside of the first filling portion 14 in the width direction DR1 of the winding core 11, the first filling portion 14 protrudes from the outside of the sheet 12. This can be suppressed, and the end portion 14A of the first filling portion 14 can be suppressed from being exposed to the outside of the sheet 12. As a result, it is possible to prevent the sheet 12 from being contaminated.

According to the present embodiment, since the second exposure suppressing members 19 and 102 are arranged on the outside of the second filling portion 16 in the width direction DR1 of the winding core 11, the second filling portion 16 protrudes from the outside of the sheet 12. This can be suppressed, and the end portion 16A of the second filling portion 16 can be suppressed from being exposed to the outside of the sheet 12. As a result, it is possible to prevent the sheet 12 from being contaminated.

According to the present embodiment, in the roll body 110, the exposure suppressing member 112 is arranged on the outside of the first filling portion 14 and the outside of the second intervening portion 111 in the width direction DR1 of the winding core 11, so that the sheet 12 It is possible to prevent the first filling portion 14 and the second intervening portion 111 from protruding to the outside of the sheet 12, and the end portion 14A of the first filling portion 14 and the end portion 111A of the second interposing portion 111 are exposed to the outside of the sheet 12. Can be suppressed. As a result, it is possible to prevent the sheet 12 from being contaminated.

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

<<< Roll body >>>
The roll body 120 shown in FIGS. 34 and 35 includes a winding core 11 and a long sheet 12 wound around the outer peripheral surface 11A of the winding core 11. As shown in FIG. 36, the roll body 120 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 provided, and the winding core 11 is provided as shown in FIGS. 35 and 38. A pair of first exposure suppressing members 121 for suppressing the end portion 14A of the first filling portion 14 in the width direction DR1 from being exposed to the outside of the sheet 12, and a second filling portion 16 in the width direction DR1 of the winding core 11. Further, a pair of second exposure suppressing members 122 for suppressing the end portion 16A from being exposed to the outside of the sheet 12 are further provided.

The sheet 12 is wound around the core 11 by a plurality of turns, for example, two or more turns. The roll body 120 may or may not include at least one of the first exposure suppressing member 121 and the second exposure suppressing member 122. Further, the roll body 120 includes a pair of first exposure suppressing members 121, but when the first exposure suppressing member 121 is provided, the roll body 120 may include at least one first exposure suppressing member 121. The roll body 120 includes a pair of second exposure suppressing members 122, but when the second exposure suppressing member 122 is provided, it suffices to include at least one second exposure suppressing member 122.

Further, the roll body 120 is further provided with a first intervening portion 20 that 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. The roll body 120 includes the first intervening portion 20, but does not have to include the first intervening portion.

<First exposure suppression member>
The first exposure suppressing member 121 is a member for suppressing the exposure of the end portion 14A of the first filling portion 14 to the outside of the sheet, as in the first embodiment, and is shown in FIGS. 37 and 38. The first exposure suppressing member 121 is a member that suppresses the exposure of the end portion 14A protruding from the sheet 12 in the first filling portion 14. That is, as shown in FIG. 37, the first exposure suppressing member 121 functions as a covering member that covers the protruding end portion 14A of the first filling portion 14. The first exposure suppressing member 121 has a sheet shape from the viewpoint of covering the end portion 14A.

The first exposure suppressing member 121 may be entirely exposed from the sheet 12, but a part of the first exposure suppressing member 121 may be covered with the sheet 12. Since a part of the first exposure suppressing member 121 is covered with the sheet 12, the first exposure suppressing member 121 is fixed, so that the misalignment of the first exposure suppressing member 121 can be suppressed.

It is preferable that the size of the exposed portion 121A exposed from the sheet 12 of the first exposure suppressing member 121 is larger than the size of the protruding end portion 14A of the first filling portion 14. As a result, the exposed portion 121A can cover the entire end portion 14A, so that contamination of the sheet 12 can be further suppressed.

The non-exposed portion 121B covered with the sheet 12 of the first exposure suppressing member 121 is preferably located in the non-effective region R2 so as not to hinder the relaxation of the step by the first filling portion 14.

In the first exposure suppressing member 121, a part of the first exposure suppressing member 121 is overlapped on the fixing member 17 as shown in FIG. 35 for the same reason as described in the column of the first exposure suppressing member 18. It is preferable to be arranged in.

The length L6 (see FIG. 38) of the exposed portion 121A in the circumferential direction DR4 of the winding core 11 depends on the length of the protruding end portion 14A in the circumferential direction DR4 of the winding core 11, but is, for example, 10 mm or more. Is preferable. When the length L6 of the exposed portion 121A is 10 mm or more, the entire length of the end portion 14A in the circumferential direction DR4 of the winding core 11 can be covered. The lower limit of the length L6 of the exposed portion 121A is more preferably 20 mm or more, 50 mm or more, or 100 mm or more. The upper limit of the length L6 of the exposed portion 121A may be, for example, ½ or less of the length obtained by subtracting 10 mm from the outer peripheral length (mm) of the winding core 11.

The width W6 (see FIG. 38) of the exposed portion 121A in the width direction DR1 of the winding core 11 may be, for example, 5 mm or more, although it depends on the length of the protruding end portion 14A in the width direction DR1 of the winding core 11. preferable. When the width W6 of the exposed portion 121A is 5 mm or more, the entire length of the protruding end portion 14A in the width direction DR1 of the winding core 11 can be covered. The width W6 of the exposed portion 121A is more preferably 10 mm or more, 30 mm or more, or 50 mm or more. The upper limit of the width W6 of the exposed portion 121A may be 40 mm or less, 30 mm or less, or 20 mm or less from the viewpoint of suppressing the concern about contamination.

The thickness of the first exposure suppressing member 121 is preferably 1 μm or more and 2000 μm or less. When the thickness of the first exposure suppressing member 121 is 1 μm or more, deformation such as breakage or breakage of the first exposure suppressing member 121 can be suppressed, and the end portion 14A can be stably covered. Further, if the thickness of the first exposure suppressing member 121 is 2000 μm or less, even when the non-exposed portion 121B is provided as shown in FIG. 38, a new step due to the first exposure suppressing member 121 is generated. It can be suppressed from occurring. The lower limit of the thickness of the first exposure suppressing member 121 is 3 μm or more, 5 μm or more, or 10 μm or more from the viewpoint that the first exposure suppressing member 121 can cover the end portion 14A more stably without breaking or deforming. Is more preferable. The upper limit of the thickness of the first exposure suppressing member 121 is more preferably 1000 μm or less, 500 μm or less, or 200 μm or less from the viewpoint of further suppressing the occurrence of a new step caused by the first exposure suppressing member 121. ..

The constituent material of the first exposure suppressing member 121 is not particularly limited as long as it is in the form of a sheet and does not contaminate the sheet, but for example, resin, metal, rubber, gel, tape (including cushion tape), clay. , Or paper. These materials are easy to handle and / or easy to install. Of these, tape is preferred because it is easy to handle and install. Further, when rubber or gel is used as the constituent material of the first exposure suppressing member 121, the first exposure suppressing member 121 itself is deformable, so that a new step caused by the first exposure suppressing member 121 is created. It can be suppressed from occurring.

<Second exposure suppression member>
The second exposure suppressing member 122 is a member for suppressing the exposure of the end portion 16A of the second filling portion 16 to the outside of the sheet, as in the first embodiment, and is shown in FIGS. 37 and 38. The second exposure suppressing member 122 is a member that suppresses the exposure of the end portion 16A protruding from the sheet 12 in the second filling portion 16. That is, as shown in FIG. 37, the second exposure suppressing member 122 functions as a covering member that covers the protruding end portion 16A of the second filling portion 16.

The second exposure suppressing member 122 may be entirely exposed from the sheet 12 for the same reason as described in the column of the first exposure suppressing member 121, but a part of the second exposure suppressing member 122 may be exposed from the sheet 12. May be covered by.

It is preferable that the size of the exposed portion 122A exposed from the sheet 12 of the second exposure suppressing member 122 is larger than the size of the protruding end portion 16A of the second filling portion 16. As a result, the exposed portion 122A can cover the entire end portion 16A, so that contamination of the sheet 12 can be further suppressed.

The non-exposed portion 122B covered with the sheet 12 of the second exposure suppressing member 122 is preferably located in the non-effective region R2 so as not to hinder the relaxation of the step by the second filling portion 16.

The second exposure suppressing member 122 is preferably in the shape of a sheet from the viewpoint of covering the entire end portion 16A.

In the second exposure suppressing member 122, a part of the second exposure suppressing member 122 is overlapped on the fixing member 17 as shown in FIG. 35 for the same reason as described in the column of the second exposure suppressing member 19. It is preferable to be arranged in. Although the first exposure suppression member 121 and the second exposure suppression member 122 shown in FIG. 35 are separate bodies, the first exposure suppression member and the second exposure suppression member are different from each other as in the exposure suppression member 123 shown in FIG. 39. The members may be integrated. In this case, the exposure suppression member 123 has not only the function of the first exposure suppression member but also the function of the second exposure suppression member.

The length L7 (see FIG. 38) of the exposed portion 122A in the circumferential direction DR4 of the winding core 11 may be, for example, 10 mm or more, although it depends on the width of the protruding end portion 16A in the circumferential direction DR4 of the winding core 11. preferable. If the length L7 of the exposed portion 122A is 10 mm or more, the entire length of the end portion 16A in the circumferential direction DR4 of the winding core 11 can be covered. The lower limit of the length L7 of the exposed portion 122A is more preferably 20 mm or more, 50 mm or more, or 100 mm or more. The upper limit of the length L7 of the exposed portion 122A may be, for example, ½ or less of the length obtained by subtracting 10 mm from the outer peripheral length (mm) of the winding core 11.

The width W7 (see FIG. 38) of the exposed portion 122A in the width direction DR1 of the winding core 11 may be, for example, 5 mm or more, although it depends on the length of the protruding end portion 16A in the width direction DR1 of the winding core 11. preferable. When the width W7 of the exposed portion 122A is 5 mm or more, the entire length of the protruding end portion 16A in the width direction DR1 of the winding core 11 can be covered. The width W7 of the exposed portion 122A is more preferably 10 mm or more, 30 mm or more, or 50 mm or more. The upper limit of the width W7 of the exposed portion 122A may be 40 m or less, 30 mm or less, or 20 mm or less from the viewpoint of suppressing the concern about contamination.

Since the thickness of the second exposure suppression member 122 is the same as the thickness of the first exposure suppression member 121, the description thereof will be omitted here.

Since the constituent material of the second exposure suppressing member 122 is the same as the constituent material of the first exposure suppressing member 121, the description thereof will be omitted here.

<< Other rolls >>
In the roll body 120, the second filling portion 16 is filled in the second gap 15, but the second filling portion 16 is filled in the second gap 15 as in the roll body 130 shown in FIG. 41. Instead, the second gap 15 may be hollow, and the second intervening portion 131 may be provided in the region 12D corresponding to at least the second gap 15 between the sheets 12 after the first lap. In this case, it is preferable that the exposure suppressing member 132 (see FIG. 40) is provided on the outside of the end 131A of the second intervening portion 131 in the width direction DR1 of the winding core 11.

<< Second intervention >>
Since the second intervening portion 131 is the same as the second intervening portion 111, the description thereof will be omitted here.

<Exposure suppression member>
The exposure suppression member 132 shown in FIG. 40 is a first exposure suppression member that suppresses exposure of the end portion 14A of the first filling portion 14, and a second exposure suppression member that suppresses exposure of the end portion 131A of the second intervening portion 131. The members are integrated. Since the first portion 132A corresponding to the first exposure suppressing member in the exposure suppressing member 132 shown in FIG. 42 is the same as the first exposure suppressing member 121, the description thereof will be omitted here. The second portion 132B corresponding to the second exposure suppressing member in the exposure suppressing member 132 shown in FIG. 42 corresponds to at least the second gap 15 between the sheets 12 provided with the second intervening portion 131 (FIG. 42). 42), and is the same as the second exposure suppressing member 122 except that it is provided outside the end 131A of the second intervening portion 131 in the width direction DR1 of the winding core 11. Shall be omitted. As shown in FIG. 43, it is preferable that the side surface of the end portion 14A of the first filling portion 14 and the side surface of the end portion 131A of the second intervening portion 131 are covered with the exposure suppressing member 132.

<< Manufacturing method of roll body >>
The roll body 120 can be manufactured, for example, by the following method. 44 and 45 are views schematically showing the manufacturing process of the roll body according to the present embodiment. First, as shown in FIG. 44 (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, the coating materials 201 and 202 are applied to the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11 as shown in FIG. 44 (B) by using a dispenser or the like. .. The coating materials 201 and 202 are both coated at the positions of the outer peripheral surface 11A of the winding core 11 corresponding to the effective region R1 of the sheet 12. Further, the coating material 201 is applied so as to be in contact with the first end surface 17A of the fixing member 17, and the coating material 202 is applied so as to be in contact with the second end surface 17B of the fixing member 17. The coating material 201 may be applied so as to be close to the first end surface 17A of the fixing member 17, and the coating material 202 may be applied so as to be close to the second end surface 17B of the fixing member 17.

After applying the coating materials 201 and 202, as shown in FIG. 45 (A), the winding start end portion 12A is arranged so that the sheet 12 covers the coating material 201. Specifically, the winding start end portion 12A of the sheet 12 is attached to the fixing member 17, and the winding start end portion 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 fixing member 17, as shown in FIG. 45B, while sandwiching a part of the first exposure suppressing member 121 and a part of the second exposure suppressing member 122. The sheet 12 is wound along the outer peripheral surface 11A of the winding core 11. Specifically, the first exposure suppressing member 121 is located outside the coating material 202 in the width direction DR1 of the winding core 11, and the second exposure suppressing member 121 is located outside the coating material 201 in the width direction DR1 of the winding core 11. A part of the first exposure suppressing member 121 is sandwiched between the winding core 11 and the sheet 12 on the first lap so that the member 122 is located, and the first is placed between the sheet 12 on the first lap and the sheet 12 on the second lap. 2 A part of the exposure suppressing member 122 is sandwiched. By sandwiching a part of the first exposure suppressing member 121 and the second exposure suppressing member 122 in this way, the first exposure suppressing member 121 and the second exposure suppressing member 122 can be continuously sandwiched. A part of the first exposure suppressing member 121 and a part of the second exposure suppressing member 122 may be sandwiched between the winding core 11 and the sheet 12 on the first lap.

When the sheet 12 is wound, the coating materials 201 and 202 flow and spread, so that the coating material 202 is filled in the first gap 13 and the coating material 201 is filled in the second gap 15 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 120 is obtained. In order to surely spread the coating material 202 or the like in the first gap 13 or the like and fill it, if the sheet 12 exceeds 1000 m, the sheet 12 is wound 1000 m or more, and if the sheet 12 is less than 1000 m. , 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 the humidity in the air and is cured by being left 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.

When producing the roll body 130 shown in FIG. 41, first, the sheet 12 is fixed to the fixing member 17, and then at least the second gap of the effective region R1 of the sheet 12 is formed along the width direction DR1 of the winding core 11. The coating material 201 is applied to the region corresponding to 15, and the coating material 202 is applied so as to be in contact with the second end surface 17B of the fixing member 17. Then, the first portion 132A of the exposure suppressing member 132 is located between the winding core 11 and the sheet 12 on the first lap so that the exposure suppressing member 132 is located outside the coating materials 201 and 202 in the width direction DR1 of the winding core 11. Is sandwiched between the sheet 12 on the first lap and the sheet 12 on the second lap, and a part of the second portion 132B of the exposure suppressing member 132 is sandwiched.

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

According to the present embodiment, since the second filling portion 16 is filled in the second gap 15, the step caused by the fixing member 17 can be effectively alleviated for the same reason as in the first embodiment.

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 member 17 can be alleviated, so that the deformation of the sheet 12 can be suppressed. As a result, seat loss can be reduced.

According to the present embodiment, the end portion 14A of the first filling portion 14 protrudes to the outside of the sheet 12, but the protruding end portion 14A is covered by the first exposure suppressing member 121, so that the sheet 12 It is possible to prevent the end portion 14A from being exposed to the outside. As a result, it is possible to prevent the sheet 12 from being contaminated.

According to the present embodiment, the end portion 16A of the second filling portion 16 protrudes to the outside of the sheet 12, but the protruding end portion 14A is covered by the second exposure suppressing member 122, so that the sheet 12 It is possible to prevent the end portion 16A from being exposed to the outside. As a result, it is possible to prevent the sheet 12 from being contaminated.

According to the present embodiment, in the roll body 130, the end portion 14A of the first filling portion 14 protrudes to the outside of the sheet 12, but the protruding end portion 14A is covered by the exposure suppressing member 132. , It is possible to prevent the end portion 14A from being exposed to the outside of the sheet 12. Further, since the exposure suppressing member 132 is arranged on the outside of the second intervening portion 131 in the width direction DR1 of the winding core 11, it is possible to prevent the second intervening portion 131 from protruding to the outside of the sheet 12, and the outside of the sheet 12 can be prevented from protruding. It is possible to prevent the end portion 131A of the second intervening portion 131 from being exposed. As a result, it is possible to prevent the sheet 12 from being contaminated.

In order to explain the present invention in detail, examples will be given below, but the present invention is not limited to these descriptions.

<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 attaching the double-sided tape, the winding core was held by the chuck member of the winding device and fixed to the winding device. Then, in the region of the outer peripheral surface of the winding core corresponding to the ineffective region of the acrylic resin film, a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", along the circumferential direction of the winding core, A linear second exposure suppression member made of Asahi Kasei Wacker Silicone Co., Ltd. was formed. The second exposure suppressing member was formed so as to be separated from the side edge in the width direction of the acrylic resin film by 15 mm. Further, in the second exposure suppressing member, the length L4 in the circumferential direction of the winding core was 10 mm, and the width W5 in the width direction of the winding core was 10 mm. One end of the second exposure suppressing member in the longitudinal direction was on the double-sided tape, and the other end protruded from the double-sided tape in the winding direction of the acrylic resin film. The color of the second exposure suppressing member was white. The length L4 and the width W5 mean the portions shown in FIG. 7.

After forming the second exposure suppressing member, the double-sided tape is located between the second exposure suppressing members and at the position of the outer peripheral surface of the winding core corresponding to the region which becomes the effective region of the acrylic resin film as a sheet described later. A two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) is placed in an environment of 25 ° C so as to contact the first end surface extending along the width direction of the winding core. Applied below. The color of this silicone resin composition was white. Further, the shear viscosity at the time of coating of this silicone resin composition is 40 Pa · s, and this silicone resin composition is along the width direction of the winding core and the coating amount per unit width is 1 cm ³ / m. It was applied in a straight line.

Then, the winding start end in the longitudinal direction of the acrylic resin film (in-plane phase difference Re: 5 nm, no base layer) having a length of 3000 m, a width of 1340 mm and a thickness of 80 μm as a sheet is double-sided tape along the width direction of the winding core. The acrylic resin film was fixed to the outer peripheral surface of the winding core. The acrylic resin film had an effective region having a width of 1270 mm and a pair of ineffective regions having a width of 35 mm located on both sides of the effective region in the width direction of the acrylic resin film.

After fixing the acrylic resin film to the outer peripheral surface of the winding core, the circumferential direction of the winding core extends from the region of the outer peripheral surface of the winding core corresponding to the ineffective region of the acrylic resin film to the ineffective region of the acrylic resin film on the first lap. A linear first exposure suppressing member made of a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) was formed. The first exposure suppressing member was formed at a position 15 mm away from the side edge in the width direction of the acrylic resin film. Further, in the first exposure suppressing member, the length L3 in the circumferential direction of the winding core is 10 mm, the width W4 in the width direction of the winding core is 10 mm, and the thickness at the position in contact with the tip surface of the acrylic resin film is It was 500 μm. One end of the first exposure suppression member in the longitudinal direction protrudes from the tip end surface of the winding start end of the acrylic resin film in the direction opposite to the winding direction of the acrylic resin film, and the other end is on the winding start end. there were. The color of the first exposure suppressing member was white. The length L3 and the width W4 mean the portions shown in FIG. 7.

After forming the first exposure suppressing member, the tip surface of the winding start end and the double-sided tape are located between the first exposure suppressing members and at the position of the outer peripheral surface of the winding core corresponding to the effective region of the acrylic resin film. A two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) is placed in an environment of 25 ° C so as to come into contact with the second end surface opposite to the first end surface. Was applied with. The color of this silicone resin composition was white. Further, the shear viscosity at the time of coating of this silicone resin composition is 40 Pa · s, and this silicone resin composition is along the width direction of the winding core and the coating amount per unit width is 1 cm ³ / m. It was applied in a straight line.

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 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 is cured to fill the first gap with a first filling portion having a length of 20 mm, a width of 1300 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 1300 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 Paar Japan Co., Ltd. Specifically, the shear viscosity of the silicone resin composition was determined by measuring the shear viscosity at a shear rate of 1 [1 / s] at 25 ° C. using a parallel plate having a diameter of 25 mm. The shear viscosity of the silicone resin composition is determined by measuring the shear viscosity of the silicone resin composition 10 times and obtaining the arithmetic mean value of 8 shear viscosities excluding the maximum and minimum values among the 10 measured viscosities. I asked. 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.

Then, the following measurement conditions were input to RETS-100.
(Measurement condition)
・ Restriction 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: 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. However, the sample was cut out from a portion separated from each end of the sheet to the inside of the sheet by 35 mm or more.

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 around 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. 10, measurements were taken at a total of 5 points, the center A1 of the sample and the points A2 to A4. Then, among the five measured values, the arithmetic mean value of three 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 first exposure-suppressing member made of a two-component curable silicone resin composition, the first exposure-suppressing member made of a cushion tape (product name "urethane foam tape 4032", manufactured by 3M Japan Co., Ltd.). A roll body was obtained in the same manner as in Example 1 except that the above was used. The first exposure suppressing member has a length L3 in the circumferential direction of the winding core of 45 mm, a width W4 in the width direction of the winding core of 40 mm, and a thickness of 800 μm at a position in contact with the tip surface of the acrylic resin film. Met.

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

<Example 4>
In Example 4, instead of the two-component curable silicone resin composition, a one-component curable silicone resin composition (product name "Hapio Seal Pro HG", manufactured by Campe Hapio Co., Ltd.) was used for the first filling portion and the first filling portion. A roll was obtained in the same manner as in Example 1 except that the two filling portions were formed. The one-component curable silicone resin composition was gray, and the shear viscosity of the one-component curable silicone resin composition at the time of application was 180 Pa · s.

<Example 5>
In Example 5, except that the two-component curable silicone resin composition was applied so that the coating amount per unit width was 0.3 cm ³ / m to form the first filling portion and the second filling portion. , A roll body was obtained in the same manner as in Example 1.

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

<Example 7>
In Example 7, instead of the acrylic resin film, a polyethylene terephthalate (PET) film having a length of 3400 mm, a width of 1495 mm and a thickness of 75 μm (product name “Cosmo Shine SRF®”, Toyobo Co., Ltd., in-plane phase difference A roll was obtained in the same manner as in Example 1 except that Re: 8400 nm) was used. The PET film had a base layer on both sides.

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

<Example 9>
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 chuck 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", manufactured by Campe Hapio Co., Ltd.) so as to come into contact with the first end surface extending along the width direction of the winding core of the double-sided tape. Was 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, and the silicone resin composition is along the width direction of the winding core so that the coating amount per unit width is 1 cm ³ / m. Was applied in a straight line.

Then, the winding start end in the longitudinal direction of the 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.

After fixing the acrylic resin film to the outer peripheral surface of the winding core, the tip surface of the winding start end portion and the second end surface of the double-sided tape on the opposite side to the effective region of the winding core and the region of the winding core correspond to the effective region of the winding core. A one-component curable silicone resin composition (product name "Hapio Seal Pro HG", manufactured by Campe Hapio Co., Ltd.) was applied as a coating material so as to come into contact with the end face 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, and the silicone resin composition is along the width direction of the winding core so that the coating amount per unit width is 1 cm ³ / m. Was applied in a straight line.

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 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.

Further, when the acrylic resin film is wound, it is between the core and the ineffective region of the acrylic resin film, and outside the silicone resin composition filled in the first gap in the width direction of the acrylic resin film. , Single-sided adhesive tape (product name "Kokofusen L size", manufactured by Kanmi Co., Ltd.) is partially sandwiched between the ineffective areas of the acrylic resin film on the first and second laps. , A second exposure suppression member, which is a single-sided adhesive tape (product name "Kokofusen L size", manufactured by Kanmi Co., Ltd.), was partially sandwiched in a region corresponding to at least the second gap in the width direction of the acrylic resin film. 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 length of 20 mm, a width of 1340 mm and a maximum thickness of 300 μm, and a first filling portion with a maximum thickness of 300 μm, and the second gap with 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 first exposure suppressing member had a length L6 of 30 mm in the circumferential direction of the winding core, a width W6 of 42 mm in the width direction of the winding core, and a thickness of 25 μm. The second exposure suppressing member had a length L7 of 30 mm in the circumferential direction of the winding core, a width W7 of 42 mm in the width direction of the winding core, and a thickness of 25 μm. The lengths L6 and L7 and the widths W6 and W7 mean the portions shown in FIG. 38.

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

<Example 11>
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 chuck member of the winding device and fixed to the winding device. After that, the winding start end in the longitudinal direction of the 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 had an effective region having a width of 1270 mm and a pair of ineffective regions having a width of 35 mm located on both sides of the effective region in the width direction of the acrylic resin film.

After fixing the acrylic resin film to the outer peripheral surface of the winding core, the circumferential direction of the winding core extends from the region of the outer peripheral surface of the winding core corresponding to the ineffective region of the acrylic resin film to the ineffective region of the acrylic resin film on the first lap. A linear exposure control member made of a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) was formed along the above. The exposure suppression member is a combination of a first exposure suppression member and a second exposure suppression member, and has a first portion corresponding to the first exposure suppression member and a second portion corresponding to the second exposure suppression member. Was. The exposure suppressing member was formed at a position 15 mm away from the side edge in the width direction of the acrylic resin film. Further, in the exposure suppressing member, the length in the circumferential direction of the winding core is 150 mm, the width in the width direction of the winding core is 10 mm, and the thickness at the position where the acrylic resin film comes into contact with the tip end surface of the winding start end. Was 500 μm. The color of this exposure suppression member was white.

Then, as a coating material, 2 so that the effective region of the acrylic resin film and the region of the core corresponding to the effective region of the acrylic resin film come into contact with the tip end surface of the winding start end portion and the second end surface opposite to the first end surface of the double-sided tape. A liquid-curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) was applied in an environment of 25 ° C. Further, as a coating material, the effective region of the acrylic resin film, which is located between the winding core and the acrylic resin film on the first lap and corresponds to the second gap in contact with the first end surface of the double-sided tape, is used as a coating material. A two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kasei Wacker Silicone Co., Ltd.) was applied in an environment of 25 ° C. The color of these silicone resin compositions was white. Further, the shear viscosity at the time of coating these silicone resin compositions is 40 Pa · s, and these silicone resin compositions are along the width direction of the winding core and the coating amount per unit width is 1 cm ³ / m. It was applied in a straight line so as to be.

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 region located between the acrylic resin films on the first and second laps and corresponding to the second gap was filled with the silicone resin composition.

In the roll body, the silicone resin composition was cured, and the first filling portion having a length of 20 mm, a width of 1340 mm and a maximum thickness of 300 μm filled in the first gap, and the acrylic resin films on the first and second laps were formed. A second intervening portion having a length of 20 mm, a width of 1340 mm, and a maximum thickness of 200 μm was formed between the regions and interposed in the region corresponding to the second gap.

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

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

<Measurement of deformation relaxation length>
In the rolls according to the examples and the comparative examples, the lengths at which the steps caused by the winding start end of the film and the steps caused by the double-sided tape were alleviated were measured. Specifically, since the step becomes smaller from the winding start end to the winding end end, the film is first fed while measuring the feeding length (m) of the film to the point where the step is visually recognized. Then, the film was cut off at the point where the step was visually recognized. A polyvinyl alcohol film was attached to the cut portion of the film, and a white LED lamp was reflected on the film in an indoor environment of 800 Lux or more and 2000 Lux or less, and visual observation was performed by reflected light. 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 white LED lamp reflected on the film has a part that is distorted as compared with other parts of the film, it is judged that there is a step, and the white reflected in the periphery where the step is present. It was determined that there was no step in the portion where the contour line of the LED lamp could be determined to be the same as the other portion of the film. The white LED lamp was arranged so that the longitudinal direction of the white LED lamp was along the longitudinal direction of the film. The length of the white LED lamp was set to be the length over the portion of the film 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 and 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 (0 °).

<Appearance evaluation>
In the rolls according to Examples and Comparative Examples, it was observed whether or not a part of the first filling portion, the second filling portion, and the second intervening portion was exposed on the outside of the film. The number of observers is 15, and when all the observers assume that a part of the first filling part, the second filling part, and the second intervening part is not exposed, the first filling part and the second filling part and the like. It was determined that the second intervening part was not exposed. The evaluation criteria are as follows.
A: A part of the first filling part and the second filling part or a part of the first filling part and the second intervening part was not exposed.
B: A part of the first filling part and the second filling part or a part of the first filling part and the second intervening part was exposed.

<Confirmation of the existence of the first intervening part>
In the rolls according to Examples 1, 4 and 5, it was confirmed whether or not the first intervening portion was present on the winding start end portion. Specifically, first, the acrylic resin film was unwound from the roll until the surface became the acrylic resin film on the second lap. Then, in the roll body having the acrylic resin film on the second lap as the surface, 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 first intervening portion is present, and when the colored portion is not present, the first intervening portion is not present. The number of observers was 15, and it was determined that the first intervening portion was present when all the observers had a colored portion on the winding start end portion.

<Measurement of L1, L1 + L2, T1, T2, S1, S1 + S2>
When the presence of the first intervening portion is not confirmed in the roll bodies according to Examples 1, 4, and 5, the length L1, the thickness T1, T2, and the area S1 are measured, and the length L1 / thickness T2 is measured. , Area S1 / thickness T2 was obtained. When the presence of the first 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 were obtained. The lengths L1 and L2, the thicknesses T1, T2, and the areas S1 and S2 mean the portions shown in FIGS. 4 and 5.

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 meters 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 acrylic resin film into three equal parts were determined. The first position was located on the first end side of the acrylic resin film in the lateral direction, 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 middle point 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 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 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 taken 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 set to 5 mm, and one scale on the vertical axis is set to 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 first intervening portion was not confirmed, the thickness T2 at the position in contact with the tip surface in the first filling portion was obtained by obtaining the difference between the displacement amount 0 mm line and the displacement amount at the position E1. ..

When the presence of the first intervening portion 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 first 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 formula (3), and was 6.24 μm. When the existence of the first 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 first intervening portion was not confirmed.

Then, when the existence of the first 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 presence of the first 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.

The edge thickness T1 was measured using a scanning optical interferometry surface shape measuring machine (product name "New View7300", manufactured by Zygo). Specifically, first, when all the acrylic resin film was unwound, the first filling portion adhered to the acrylic resin film 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 acrylic resin film. The sample was cut out from an arbitrary portion including the tip portion of the first filling portion and to which dirt, fingerprints, etc. were not attached. 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
・ Scan Length: 5 μm
・ Min mod: 0.015
・ Temperature: 23 ℃
・ Relative humidity: 50%

The results are shown in Tables 1 and 2 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 the first gap was hollow, so the step caused by the winding start end of the acrylic resin film was large, and the second gap was hollow, so the step caused by the double-sided tape was large. it is conceivable that. On the other hand, the roll bodies according to Examples 1 to 11 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 10, 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 second gap was filled. It is considered that this is because the step caused by the double-sided tape was small because the second filling portion was filled or the second intervening portion was interposed in the region corresponding to the second gap.

In the roll body according to Comparative Example 2, the end portion of the first filling portion was exposed. It is considered that this is because the pressure was applied to the silicone resin composition when the acrylic resin film was wound, so that the pressure was applied to the outside of the acrylic resin film. On the other hand, the roll bodies according to Examples 1 to 8 include a first exposure suppressing portion that suppresses the protrusion itself of the first filling portion and a second exposure suppressing member that suppresses the protrusion itself of the second filling portion. Therefore, the end portion of the first filling portion and the end portion of the second filling portion did not protrude from the film such as the acrylic resin film, and thus were not exposed. Further, the roll body according to Examples 9 and 10 includes a first exposure suppressing portion that covers the protruding end of the first filling portion and a second exposure suppressing member that covers the protruding end of the second filling portion. Therefore, the end portion of the first filling portion and the end portion of the second filling portion were not exposed. Since the roll body according to the eleventh embodiment includes a first portion that covers the protruding end of the first filling portion and a second portion that suppresses the protruding end of the second filling portion, the end portion of the first filling portion is provided. And the end of the second filling was not exposed.

The deformation relaxation length of the winding start end portion in the roll body according to Example 6 was shorter than the deformation relaxation length of the winding start end portion in the roll body according to Example 7. It is considered that this is because the in-plane retardation of the PET film used in the roll body according to Example 6 was smaller than the in-plane retardation difference of the PET film used in the roll body according to Example 7. ..

The first filling portion of the roll body according to Examples 1 and 4 has a length L1 / thickness T2 or (length L1 + length L2) / thickness T2 of 90 or more, and / or an area S1 / thickness T2 or ( Since the area S1 + area S2) / thickness T2 was 3.0 or more, the deformation relaxation length at the winding start end was shorter than that of the roll body according to Example 5 in which the length L1 / thickness T2 was less than 90. ..

10, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130 ... Roll body 11 ... Winding core 11A ... Outer peripheral surface 12 ... Sheet 12A ... Winding start end 12A1 ... Tip surface 13 ... First 1 Gap 14 ... First filling portion 15 ... Second gap 16 ... Second filling portion 17, 81 ... Fixing member 18, 101, 121 ... First exposure suppressing member 19, 102, 122 ... Second exposure suppressing member 111 ... Second 2 Intervening portions 112, 132 ... Exposure suppression member

Claims (26)

1. 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 at the winding start end of the sheet on the first lap in the longitudinal direction.
   The first filling portion that is filled in the first gap and extends in the width direction of the winding core, and the first filling portion.
   A roll body including a first exposure suppressing member that suppresses exposure of an end portion of the first filling portion in the width direction on the outside of the sheet.
2. The roll body according to claim 1, wherein the first exposure suppressing member is located outside the end portion of the first filling portion in the width direction and is covered with the sheet.
3. 1 The roll body described in.
4. The roll body according to claim 2, wherein the first exposure suppressing member extends along the circumferential direction of the winding core.
5. The roll body according to claim 2, wherein the length of the first exposure suppressing member in the circumferential direction of the winding core is larger than the maximum length of the first filling portion in the circumferential direction.
6. The claim that the end portion of the first filling portion protrudes to the outside of the sheet, the first exposure suppressing member is in the form of a sheet, and covers the protruding end portion of the first filling portion. The roll body according to 1.
7. The roll body according to claim 1, wherein the first filling portion contains a coloring material or a light emitting material.
8. The roll body according to claim 1, wherein the first filling portion contains a cured product of a curable polymer composition.
9. The roll body according to claim 1, wherein the first exposure suppressing member is made of resin or is a tape.
10. 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 lap, 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,
    A second gap located between the winding core and the sheet on the first lap and in contact with the first end surface of the fixing member.
    A second filling portion that is filled in the second gap and extends in the width direction of the winding core,
    A roll body including a second exposure suppressing member that suppresses exposure of an end portion of the second filling portion in the width direction on the outside of the sheet.
11. The roll body according to claim 10, wherein the second exposure suppressing member is located outside the end portion of the second filling portion in the width direction and is covered with the sheet.
12. 11. The sheet has an effective region and an ineffective region located outside the effective region in the width direction, and the second exposure suppressing member is located in the ineffective region of the sheet. The roll body described in.
13. The roll body according to claim 11, wherein the second exposure suppressing member extends along the circumferential direction of the winding core.
14. The roll body according to claim 11, wherein the length of the second exposure suppressing member in the circumferential direction of the winding core is larger than the maximum length of the second filling portion in the circumferential direction.
15. The claim that the end portion of the second filling portion protrudes to the outside of the sheet, the second exposure suppressing member is in the form of a sheet, and covers the protruding end portion of the second filling portion. 10. The roll body according to 10.
16. The roll body according to claim 10, wherein the second filling portion contains a coloring material or a light emitting material.
17. The roll body according to claim 10, wherein the second filling portion contains a cured product of a curable polymer composition.
18. 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 lap, is located on the opposite side of the first end surface extending in the width direction of the winding core and the first end surface, and is on the first lap from the first end surface. A fixing member having a second end surface located on the winding start end side in the longitudinal direction of the sheet and fixing a part of the sheet to the winding core.
    A second gap located between the winding core and the sheet on the first lap and in contact with the first end surface of the fixing member.
    An intervening portion provided in a region corresponding to at least the second gap between the sheets from the first lap onward and extending in the width direction of the winding core, and
    A roll body comprising a second exposure suppressing member that suppresses exposure of the end portion of the intervening portion in the width direction on the outside of the sheet.
19. 18. The second aspect of claim 18, wherein the second exposure suppressing member is located outside the end portion of the intervening portion in the width direction, and at least a part of the second exposure suppressing member is covered with the sheet. Roll body.
20. The roll body according to claim 18, wherein the second exposure suppressing member extends along the circumferential direction of the winding core.
21. The roll body according to claim 18, wherein the length of the second exposure suppressing member in the circumferential direction of the winding core is larger than the maximum length of the intervening portion in the circumferential direction.
22. The roll body according to claim 18, wherein the intervening portion contains a coloring material or a light emitting material.
23. The roll body according to claim 18, wherein the intervening portion contains a cured product of a curable polymer composition.
24. The roll body according to claim 1, 10 or 18, wherein the sheet is a resin film, paper, or glass film.
25. The roll body according to claim 1, 10 or 18, wherein the sheet contains an acrylic resin, a polyester resin, or a cycloolefin polymer resin.
26. The roll body according to claim 1, 10 or 18, wherein the thickness of the sheet is 15 μm or more and 300 μm or less.
    
    

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