CN116096663A - Rolling body - Google Patents

Abstract

The invention provides a roll body, which can effectively alleviate the step difference caused by the winding start end of a sheet material and can inhibit pollution. According to one aspect of the present invention, there is provided a roll (10) including a core (11) and an elongated sheet (12) wound around an outer peripheral surface (11A) of the core (11), the roll including: a 1 st gap (13) which is located between the winding core (11) and the 1 st sheet (12) and which is in contact with the distal surface (12A) at the winding start end (12A) in the longitudinal direction (DR 2) of the 1 st sheet (12); a 1 st filling part (14) which fills the 1 st gap (13) and extends along the width direction (DR 1) of the winding core (11); and a 1 st exposure suppressing member (18) that suppresses exposure of the end (14A) of the 1 st filling portion (14) in the width direction (DR 1) to the outside of the sheet (12).

Description

Rolling body

Reference to related applications

The present application enjoys the benefit of priority as Japanese patent application 2020-131040 (application date: 31. 7. 2020) of the prior Japanese application, the disclosure of which is incorporated by reference in its entirety as part of the present specification.

Technical Field

The invention relates to a coil body.

Background

In many cases, sheets such as films are manufactured in a concentrated manner to a certain extent from the viewpoint of manufacturing efficiency, and are wound around a winding core and stored as a roll. In such a roll, a step is generated by the winding start end of the sheet. Specifically, a step occurs when the sheet at week 1 is shifted to week 2, and the step also occurs after week 2. In addition, if the step occurs depending on the type of the sheet, the sheet may be deformed and not restored.

Currently, the following techniques are proposed: the step is alleviated by attaching or embedding a buffer tape having high cushioning properties such as urethane resin to the outer peripheral surface of the winding core and embedding a sheet material to the buffer tape (for example, refer to patent document 1); the step is alleviated by using a winding core having rubber on the outer peripheral surface and embedding the sheet into the rubber; alternatively, a buffer having elastic force is provided on the outer peripheral surface of the winding core along the end of the winding start end of the sheet (for example, refer to patent document 2).

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication No. 2005-75521

Patent document 2: japanese patent laid-open No. 2013-199355

Disclosure of Invention

Problems to be solved by the invention

However, in any of the above-described techniques, the step difference cannot be effectively alleviated.

When winding a sheet around a winding core, a fixing member such as a double-sided tape is first stuck to the outer peripheral surface of the winding core to fix a part (for example, a winding start end) of the sheet, but there is a case where a step occurs due to the fixing member.

Currently, in order to effectively mitigate these step differences, the following schemes have been studied: the gap formed when the sheet at week 1 is shifted to week 2 or the gap formed by the fixing member and the sheet at week 1 is filled with the filler, but if the filler is filled in these gaps, the filler may overflow due to the pressure at the time of winding the sheet. If the overflowed portion is exposed, the overflowed portion may adhere to a roll or the like, which may cause contamination.

The present invention has been made to solve the above-described problems. That is, an object of the present invention is to provide a roll body that can effectively alleviate a step caused by a winding start end portion of a sheet material and can suppress contamination. Further, an object of the present invention is to provide a roll body that can effectively alleviate a step caused by a fixing member and can suppress contamination.

Means for solving the problems

The present invention includes the following inventions.

[1] A roll body including a roll core and an elongated sheet wound around an outer peripheral surface of the roll core, wherein the roll body includes: a 1 st gap which is located between the winding core and the sheet of 1 st week and which is in contact with a distal end surface of a winding start end portion of the sheet of 1 st week in a longitudinal direction; a 1 st filling portion that is filled in the 1 st gap and extends in the width direction of the winding core; and a 1 st exposure suppressing member that suppresses exposure of an end portion of the 1 st filling portion in the width direction to an outside of the sheet.

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

[3] The roll according to the above [1] or [2], wherein the sheet has: an effective area; and an inactive area located outside the active area in the width direction, the 1 st exposure suppressing member being located in the inactive area of the sheet.

[4] The roll body according to the above [2] or [3], wherein the 1 st exposure suppressing member extends in the circumferential direction of the winding core.

[5] The roll body according to any one of [2] to [4] above, wherein a length of the 1 st exposure suppressing member in a circumferential direction of the roll core is larger than a maximum length of the 1 st filling portion in the circumferential direction.

[6] The roll body according to the above [1], wherein the end portion of the 1 st filling portion overflows to the outside of the sheet, the 1 st exposure suppressing member is sheet-shaped, and covers the overflowed end portion of the 1 st filling portion.

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

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

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

[10] A roll body including a roll core and an elongated sheet wound around an outer peripheral surface of the roll core, wherein the roll body includes: a fixing member that is provided between the winding core and the sheet material of the 1 st circumference, has a 1 st end surface extending in the width direction of the winding core and a 2 nd end surface on the opposite side to the 1 st end surface, and fixes a part of the sheet material with respect to the winding core; a 2 nd gap which is located between the winding core and the sheet material of the 1 st circumference and which is in contact with the 1 st end surface of the fixing member; a 2 nd filling portion that is filled in the 2 nd gap and extends in the width direction of the winding core; and a 2 nd exposure suppressing member that suppresses exposure of an end portion of the 2 nd filling portion in the width direction to an outside of the sheet.

[11] The roll body according to the above [10], wherein the 2 nd exposure suppressing member is located outside the end portion of the 2 nd filling portion in the width direction and is covered with the sheet.

[12] The roll according to the above [11], wherein the sheet has: an effective area; and an inactive area located outside the active area in the width direction, the 2 nd exposure suppressing member being located in the inactive area of the sheet.

[13] The roll body according to the above [11] or [12], wherein the 2 nd exposure suppressing member extends in the circumferential direction of the winding core.

[14] The roll body according to any one of [11] to [13] above, wherein a length of the 2 nd exposure suppressing member in a circumferential direction of the roll core is larger than a maximum length of the 2 nd filling portion in the circumferential direction.

[15] The roll body according to the above [10], wherein the end portion of the 2 nd filling portion overflows to the outside of the sheet, the 2 nd exposure suppressing member is sheet-shaped, and covers the overflowed end portion of the 2 nd filling portion.

[16] The roll according to any one of [10] to [15] above, wherein the 2 nd filling portion contains a coloring material or a light-emitting material.

[17] The roll according to any one of [10] to [16] above, wherein the 2 nd filling portion comprises a cured product of a curable polymer composition.

[18] A roll body including a roll core and an elongated sheet wound around an outer peripheral surface of the roll core, wherein the roll body includes: a fixing member that is provided between the winding core and the sheet material at the 1 st circumference, has a 1 st end surface extending in the width direction of the winding core, and a 2 nd end surface located on the opposite side of the 1 st end surface from the 1 st end surface and closer to the 1 st end surface than the 1 st end surface on the winding start end portion side in the longitudinal direction of the sheet material, and fixes a part of the sheet material to the winding core; a 2 nd gap which is located between the winding core and the sheet material of the 1 st week and which is in contact with the 1 st end face of the fixing member; a sandwiching portion provided in a region corresponding to at least the 2 nd gap between the sheets after the 1 st week and extending in the width direction of the winding core; and a 2 nd exposure suppressing member that suppresses exposure of an end portion of the sandwiching portion in the width direction to an outside of the sheet.

[19] The roll according to the above [18], wherein the 2 nd exposure suppressing member is located outside the end portion of the sandwiching portion in the width direction, and at least a part of the 2 nd exposure suppressing member is covered with the sheet.

[20] The roll body according to the above [18] or [19], wherein the 2 nd exposure suppressing member extends in the circumferential direction of the winding core.

[21] The roll body according to any one of [18] to [20] above, wherein a length of the 2 nd exposure suppressing member in a circumferential direction of the roll core is larger than a maximum length of the sandwiching portion in the circumferential direction.

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

[23] The roll according to any one of [18] to [21], wherein the interposed portion comprises a cured product of a curable polymer composition.

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

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

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

ADVANTAGEOUS EFFECTS OF INVENTION

According to one embodiment of the present invention, there can be provided a roll body: which can effectively alleviate a step caused by a winding start end of a sheet and can suppress contamination. Further, according to another aspect of the present invention, there can be provided a roll body: which can effectively alleviate the step difference caused by the fixing member and can suppress contamination.

Drawings

Fig. 1 is a perspective view of a roll body according to embodiment 1.

Fig. 2 is a top view of the roll of fig. 1.

Fig. 3 is an enlarged view of a portion of a section of the I-I line in the roll of fig. 2.

Fig. 4 is a diagram for explaining the dimensions of each constituent element of the roll body of fig. 1.

Fig. 5 is a view showing 2 areas around the 1 st filling portion of the roll body of fig. 1.

Fig. 6 is an enlarged view of a portion of a section of line II-II in the roll of fig. 2.

Fig. 7 is an enlarged top view of a portion of the roll of fig. 1.

Fig. 8 is an enlarged view of a part of another roll of embodiment 1.

Fig. 9 is an enlarged view of a part of another roll of embodiment 1.

Fig. 10 is a top view of a sample for determining the position of the phase difference in the measurement plane.

Fig. 11 is a top view of a roll for determining the measurement position of a laser displacement meter.

Fig. 12 is a schematic diagram of the displacement amount with respect to the position produced based on the measurement of the laser displacement meter.

Fig. 13 is an enlarged view of a part of another roll of embodiment 1.

Fig. 14 is an enlarged view of a part of another roll of embodiment 1.

Fig. 15 is an enlarged view of a part of another roll of embodiment 1.

Fig. 16 is an enlarged view of a part of another roll of embodiment 1.

Fig. 17 is an enlarged view of a part of another roll of embodiment 1.

Fig. 18 is an enlarged view of a part of another roll of embodiment 1.

Fig. 19 is an enlarged view of a part of another roll of embodiment 1.

Fig. 20 is an enlarged view of a part of another roll of embodiment 1.

Fig. 21 is an enlarged view of a part of another roll of embodiment 1.

Fig. 22 is an enlarged view of a part of another roll of embodiment 1.

Fig. 23 is a plan view of another roll of embodiment 1.

Fig. 24 is a cross-sectional view of line III-III in the roll of fig. 23.

Fig. 25 is a cross-sectional view of the roll of fig. 23 taken along line IV-IV.

Fig. 26 is a plan view of another roll of embodiment 1.

Fig. 27 is an enlarged view of a portion of the cross section of the V-V line in the roll of fig. 26.

Fig. 28 is a view of the maximum thickness and length of the 2 nd sandwiching portion shown in fig. 27.

Fig. 29 is an enlarged view of a portion of the cross section of line VI-VI in the roll of fig. 26.

Fig. 30 (a) and 30 (B) are diagrams schematically showing a process for manufacturing a roll according to embodiment 1.

Fig. 31 (a) and 31 (B) are diagrams schematically showing a process for manufacturing a roll according to embodiment 1.

Fig. 32 (a) and 32 (B) are diagrams schematically showing a process for manufacturing a roll body according to embodiment 1.

Fig. 33 is a diagram schematically showing a process for manufacturing a roll body according to embodiment 1.

Fig. 34 is a perspective view of the roll body according to embodiment 2.

Fig. 35 is a top view of the roll of fig. 34.

Fig. 36 is an enlarged view of a portion of the cross section of line VII-VII in the roll of fig. 35.

Fig. 37 is an enlarged view of a portion of the section of line VIII-VIII in the roll of fig. 35.

Fig. 38 is an enlarged top view of a portion of the roll of fig. 34.

Fig. 39 is an enlarged view of a part of another roll of embodiment 2.

Fig. 40 is a plan view of another roll of embodiment 2.

Fig. 41 is an enlarged view of a part of a cross section of line IX-IX in the roll of fig. 40.

Fig. 42 is an enlarged view of a portion of a cross section of the roll of fig. 40 taken along line X-X.

Fig. 43 is an enlarged view of a portion of the section of line XI-XI in the roll of fig. 40.

Fig. 44 (a) and 44 (B) are diagrams schematically showing a process for manufacturing a roll according to embodiment 2.

Fig. 45 (a) and 45 (B) are diagrams schematically showing a process for manufacturing a roll according to embodiment 2.

Detailed Description

First embodiment

Hereinafter, a roll according to embodiment 1 of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view of the roll body according to embodiment 1, fig. 2 is a plan view of the roll body according to embodiment 1, fig. 3 is an enlarged view of a part of a section of a line I-I in the roll body according to fig. 2, fig. 4 is a view for explaining the dimensions of each constituent element of the roll body according to embodiment 1, fig. 5 is a view showing 2 areas around the 1 st filling portion in the roll body according to embodiment 1, fig. 6 is an enlarged view of a part of a section of a line II-II in the roll body according to embodiment 2, and fig. 7 is an enlarged plan view of a part of the roll body according to embodiment 1. Fig. 8 and 9 are enlarged views of a part of another roll according to the present embodiment, and fig. 10 is a plan view of a sample for determining the position of the in-plane phase difference. Fig. 11 is a plan view of a roll for specifying a measurement position of a laser displacement meter, and fig. 12 is a schematic diagram of a displacement amount with respect to a position, which is produced based on measurement of the laser displacement meter. Fig. 13 to 22 are enlarged views of a part of another roll according to the present embodiment. Fig. 23 is a plan view of another roll of the present embodiment, fig. 24 is a cross-sectional view taken along line III-III in the roll of fig. 23, and fig. 25 is a cross-sectional view taken along line IV-IV in the roll of fig. 23. Fig. 26 is a plan view of another roll of the present embodiment, fig. 27 is an enlarged view of a part of a cross section of a V-V line in the roll of fig. 26, fig. 28 is a view when the maximum thickness and length of the 2 nd nip portion shown in fig. 27 are measured, and fig. 29 is an enlarged view of a part of a cross section of a VI-VI line in the roll of fig. 36.

Roll body

The roll 10 shown in fig. 1 and 2 includes a core 11 and an elongated sheet 12 wound around an outer peripheral surface 11A of the core 11. As shown in fig. 3, the roll 10 includes: a 1 st filling portion 14 that fills a 1 st gap 13 between the winding core 11 and the sheet 12; a 2 nd filling portion 16 that fills a 2 nd gap 15 between the winding core 11 and the sheet 12; and a fixing member 17 for fixing a part of the sheet 12 to the winding core 11, and further includes, as shown in fig. 2 and 6: a pair of 1 st exposure suppressing members 18 that suppress exposure of the end 14A of the 1 st filling portion 14 in the width direction DR1 of the winding core 11 to the outside of the sheet 12; and a pair of 2 nd exposure suppressing members 19 that suppress exposure of the end 16A of the 2 nd filling portion 16 in the width direction DR1 of the winding core 11 to the outside of the sheet 12.

The sheet 12 is wound around the winding core 11 more than once, for example, more than 2 times. The roll 10 may be provided with at least one of the 1 st exposure suppressing member 18 and the 2 nd exposure suppressing member 19, or may not be provided with both members. Further, although the roll body 10 includes the pair of 1 st exposure suppressing members 18, in the case where the 1 st exposure suppressing members 18 are provided, at least one 1 st exposure suppressing member 18 may be provided. Although the roll 10 includes a pair of the 2 nd exposure suppressing members 19, in the case where the 2 nd exposure suppressing members 19 are provided, at least one of the 2 nd exposure suppressing members 19 may be provided.

As shown in fig. 3, the roll 10 further includes a 1 st nip portion 20 provided continuously with the 1 st filling portion 14 and interposed between the 1 st sheet 12 and the 2 nd sheet 12. The roll 10 is provided with the 1 st sandwiching portion 20 as shown in fig. 3, but may not be provided with the 1 st sandwiching portion as in the roll 30 shown in fig. 8.

Roll core

The shape of the winding core 11 is not particularly limited, and is preferably cylindrical or cylindrical from the viewpoint of being able to easily wind the sheet 12. The winding core 11 shown in fig. 1 is cylindrical. When the winding core is cylindrical, the winding body 10 can be held by inserting the chuck member of the winding device into the hole 11B in the width direction DR1 of the winding core 11. The chuck member is a member for rotatably fixing and holding the winding 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 cylindrical, the winding core includes a shaft member penetrating the winding core, and the winding body can be held by the winding device by attaching the shaft member to the winding device.

The width W1 (see fig. 2) of the winding core 11 is not particularly limited, and may be, for example, 0.1m or more and 50m or less. The lower limit of the width W1 of the winding core 11 may be 0.2m or more, 0.3m or more, 0.7m or more, 1.0m or more, 1.5m or more, or 2m or more, and the upper limit may be 30m or less, 20m or less, 10m or less, 7m or less, 5m or less, 3.5m or less, 3m or less, or 2.5m or less. The width of the winding core can be determined as follows: the width of the winding core at 10 is measured, and the arithmetic average value of the measured width at 8 positions excluding the maximum value and the minimum value among the widths at 10 positions is obtained.

The outer diameter of the winding core 11 is not particularly limited, and may be, for example, 30mm to 8000 mm. The lower limit of the outer diameter of the winding core 11 may be 90mm or more and 100mm or more, and the upper limit may be 5000mm or less, 3500mm or less, 2000mm or less, 1000mm or less, 700mm or less, 500mm or less, 350mm or less, or 300mm or less. The outer diameter of the winding core can be determined as follows: the outer diameter of the winding core at 10 is measured, and the arithmetic average value of the measured outer diameters at 8 positions, from among the outer diameters at 10 positions, excluding the maximum value and the minimum value, is obtained.

When the winding core 11 is cylindrical, the inner diameter of the winding core 11 is not particularly limited, and may be 20mm to 7500 mm. The lower limit of the inner diameter of the winding core 11 may be 50mm or more, 80mm or more, 120mm or more, 150mm or more, and the upper limit may be 4500mm or less, 3000mm or less, 1500mm or less, 900mm or less, 600mm or less, 400mm or less, 250mm or less, or 200mm or less. The inner diameter of the winding core can be determined as follows: the inner diameter of the winding core at 10 is measured, and the arithmetic average value of the inner diameters at 8 positions after the maximum value and the minimum value are removed in the measured inner diameters at 10 positions is obtained.

In order to alleviate the step caused by the winding start end of the sheet, a step may be formed at a portion of the outer peripheral surface of the winding core where the sheet is brought into contact so that the position of the winding start end of the sheet is close to the center of the winding core, but such a step is not formed at a portion of the outer peripheral surface 11A of the winding core 11 where the sheet 12 is brought into contact. By using the winding core 11 having no step in the above-described portion of the outer peripheral surface 11A, sheets 12 of various thicknesses can be handled. In the present specification, "no step is formed at a portion of the outer peripheral surface of the winding core where the sheet is in contact" means that: in the center of the winding core and each circumference of the portion separated from the center by 100mm or more in the width direction of the winding core, there is no portion having a height difference of 3 μm or more. In addition, a step of less than 3 μm may be formed at a portion of the outer peripheral surface 11A of the winding core 11 where the sheet 12 is brought into contact. When such a step is formed, there is no problem in use, and the sheet 12 is easily peeled from the winding 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. The paper also includes paper impregnated with resin. Examples of the plastic include fiber reinforced plastics (FRP/Fiber Reinforced Plastics), polyolefins such as Polyethylene (PE) and polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), phenol resins, nylon, and the like. Among them, for example, in the case of performing coating processing for optical use, fiber Reinforced Plastics (FRP) are preferable from the viewpoints of weight, workability and strength. Examples of the fiber reinforced plastic include a material in which fibers such as glass, epoxy resin, polyester, carbon, and aramid are mixed with a main body made of epoxy resin or phenolic resin. Examples of the metal include iron, stainless steel (SUS), and aluminum.

Sheet material

The sheet 12 is elongated. Specifically, with respect to the sheet 12, the thickness is sufficiently thin relative to the width, and the length is sufficiently long.

The width W2 (see fig. 2) of the sheet 12 is not particularly limited, and may be, for example, 0.1m or more and 50m or less. The "width of the sheet" in the present specification refers to the length of the sheet in the short side direction (the winding core in the width direction). The lower limit of the width W2 of the sheet 12 may be 0.2m or more, 0.3m or more, 0.5m or more, 1.0m or more, or 2.0m or more, and the upper limit may be 30m or less, 20m or less, 10m or less, 7m or less, 5m or less, 3.5m or less, or 3m or less. The width of the sheet can be determined as follows: the width of the sheet at 10 was measured, and the arithmetic average of the width at 8 out of the measured widths at 10, excluding the maximum value and the minimum value, was found.

The width W2 of the sheet 12 is preferably smaller than the width W1 of the winding core 11. This enables the sheet 12 to be held reliably 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 1mm or more and 50mm or less, the unused portion becomes smaller in the case of the tape product surface, and can be efficiently selected, which is preferable. The lower limit of the difference may be 1mm or more, 20mm or more, or 50mm or more, and the upper limit may be 70mm or less, 40mm or less, or 25mm or less.

The length of the sheet 12 may be, for example, 20m or more and 10000m or less. The "length of the sheet" in the present specification refers to the length of the sheet in the longitudinal direction DR2 (see fig. 3). The lower limit of the length of the sheet 12 may be 30m or more, 40m or more, or 50m or more, and the upper limit may be 9000m or less, or 8000m or less.

The thickness of the sheet 12 is not particularly limited, and may be, for example, 3 μm or more and 600 μm or less. The lower limit of the thickness of the sheet 12 may be 10 μm or more, 15 μm or more, 20 μm or more, or 30 μm or more, and the upper limit may be 500 μm or less, 400 μm or less, 300 μm or less, 200 μm or less, 110 μm or less, or 80 μm or less. In the case where a film is preferable depending on the application, the film is not limited thereto, but is preferably 3 μm or more and less than 50 μm, more preferably 40 μm or less. The thickness of the sheet can be determined as follows: the thickness of the sheet at 10 was measured, and the arithmetic average of the thicknesses at 8 positions after the removal of the maximum value and the minimum value among the measured thicknesses at 10 positions was found. Further, when the thickness of the sheet is large, the step is hardly generated, but the thinner the sheet is, the more remarkable the step is. The present invention is particularly effective when the thickness of the sheet is small (80 μm or less, less than 50 μm, and further 40 μm or less).

When the sheet 12 includes, 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 is smaller, but when the thickness of the sheet is made extremely thin, the step tends to become smaller instead. For example, if a heating step of 50 ℃ or higher is present in the subsequent steps, the deformation due to the step may be eliminated if the sheet is a thin sheet. However, if the thickness of the sheet is a certain level (for example, 15 μm or more), the deformation may not be eliminated even if the heating step is performed. Therefore, the present invention is particularly effective when the thickness of the sheet 12 is 15 μm or more. In addition, in the case where the sheet 12 contains any of these resins, if the thickness of the sheet is excessively thick, a large amount of coating material is required. Therefore, the thickness of the sheet 12 is preferably 300 μm or less from the viewpoint of cost reduction. In addition, when any of these resins is contained, if the thickness exceeds 300 μm, there is a case where a step is hard to occur. When the sheet 12 contains any of these resins, the lower limit of the thickness of the sheet 12 is more preferably 20 μm or more, 35 μm or more, or 50 μm or more, and the upper limit of the thickness of the sheet 12 is more preferably 250 μm or less, 200 μm or less, 150 μm or less, or 100 μm or less. In the case of containing any of these resins, the present invention is particularly effective for a thickness that is not too thin and 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. If the thickness of the glass film is 5 μm or more, physical properties as glass can be maintained, and if the thickness of the glass film 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 of being less prone to crack generation or breakage even if micro-cracks are generated. From the viewpoint of the elongation and thinning, 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.

When the sheet 12 is paper to be described later, the thickness of the paper is preferably 50 μm or more and 110 μm or less. If the thickness of the paper is 50 μm or more, strength can be ensured for a long period of time, and if the thickness of the paper is 110 μm or less, winding into a roll is easy. 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. From the viewpoint of the length of the roll, the upper limit of the thickness of the paper may be 100 μm or less, 90 μm or less, or 80 μm or less.

In addition, in the case where the fixing member 17 is provided, since the sheet 12 is disposed 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, if 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 small, and therefore the upper limit thereof is preferably 130 μm or less, more preferably 90 μm or less. In addition, when the fixing member is an adhesive tape, if the thickness of the fixing member exceeds 15% of the thickness of the sheet, the step is more likely to be affected. Therefore, the thickness of the sheet 12 is preferably not too thin, and the lower limit of the thickness of the sheet 12 is preferably 20 μm or more or 35 μm or more, for example.

Examples of the sheet include a film, a metal foil, and paper (for example, wallpaper). The film may be, for example, a resin film or a glass film. The term "glass film" as used herein refers to a flexible glass substrate that can be wound into a roll. When a resin film or a glass film is used for a purpose requiring light transmittance (for example, an optical film purpose), the resin film or the glass film preferably has light transmittance. The resin constituting such a resin film is not particularly limited as long as it has light transmittance, and examples thereof include acrylic resins, polyolefin resins (polyethylene resins, polypropylene resins, cycloolefin polymer resins), polycarbonate resins, polyacrylate resins, polyester resins (polyethylene terephthalate, polyethylene naphthalate, and the like), aromatic polyether ketone resins, polyether sulfone resins, acetyl cellulose resins (for example, triacetyl cellulose resins), polyimide resins, polyamideimide resins, polyamide resins, and mixtures obtained by mixing these resins by 2 or more. Among them, a resin film having high flexibility, for example, a resin film containing an acrylic resin, a polyolefin resin, a polyester resin, an acetyl cellulose resin, a polyimide resin, a polyamideimide resin, or a polyamide resin is easily deformed by a step caused by a winding start end of a sheet or a step caused by a fixing member, and therefore the technique of the present invention is effective. Further, in recent years, in a large display, a low moisture-permeable resin having little deformation and low moisture permeability has been preferably used. In the case of a large-sized display, since the entire sheet width is often a product, the entire sheet must be discarded even if deformation due to a step remains locally. For example, acrylic resins, polyester resins, and cycloolefin polymer resins are preferable for large-sized displays, but according to the technique of the present invention, deformation due to a step can be well prevented and mass productivity can be improved, and therefore the technique of the present invention is particularly effective for sheets composed of these resins. In addition, in the case where the final product requires thinness, for example, in the case where a film having a thickness of less than 50 μm is used, the technique of the present invention is suitable for films of any material.

The in-plane retardation (retardation: re) of the sheet 12 is not particularly limited. For example, the in-plane retardation Re of the sheet 12 may be 1nm or more and 20000nm or less. In the case where the sheet 12 is used for an optical film, particularly when the sheet 12 contains an acrylic resin or a cycloolefin polymer resin, the in-plane retardation Re of the sheet 12 is preferably 10nm or less. An in-plane retardation Re of 10nm or less of the sheet 12 means that the optical strain is small, and it can be said that there is almost no residual stress of the sheet 12 at the time of production. That is, when the in-plane retardation Re of the sheet 12 is 10nm or less, the polymer in the sheet 12 is uniform, and therefore, when the sheet 12 is rolled into a long roll, a new step due to the polymer state inside the sheet 12 is less likely to occur, which is preferable. The upper limit of the in-plane retardation Re of the sheet 12 is more preferably 8nm or less, or 4nm or less, from the viewpoint that color unevenness and blackening, which are problems, are less likely to occur when used in combination with a polarizer in a display application. In the case of the acrylic resin, when the film is bent as in the case of the conventional acrylic resin film, it is preferable that the film does not turn white and the haze value (total haze value) is less than 1% or less than 0.5%.

In addition, in the case where the sheet 12 is used for an optical film and contains a polyester resin, it is preferable that a new step is not easily generated due to the internal polymer state when the polymer in the sheet 12 is uniform, as in the above. In the case where the sheet 12 contains a polyester resin, stretching is indispensable for obtaining physical strength, and thus, in order to make the polymer state as uniform as possible, it can be produced by sequential biaxial stretching at approximately the same magnification in the machine direction and the transverse direction, or simultaneously. As a result, a sheet containing a polyester resin having a smaller in-plane retardation 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 1500nm or less, preferably 1200nm or less, more preferably 1000nm or less, and still more preferably 800nm or less. In order to improve the physical properties such as the elastic modulus and the tear strength of the biaxially stretched polyester plastic film, the in-plane retardation is preferably not too small, but is preferably 200nm or more, more preferably 400nm or more.

In order to improve the physical properties, it is preferable to consider the birefringence in the in-plane direction and the balance between the birefringence and the birefringence in the film thickness direction. As an index thereof, there is an Nz coefficient. The Nz coefficient is affected by the crystallinity and orientation of the film inside, and is therefore related to the characteristics of the sheet as a whole. In the case of polyethylene terephthalate, for example, the Nz coefficient is usually 2 to 4, and in particular, in the case of producing a long roll, the Nz coefficient is preferably 5 or more, more preferably 8 or more, and most preferably 10 or more, from the point that a new step due to the polymer state in the sheet is less likely to occur. The upper limit of the Nz coefficient is about 80, preferably 70 or less, and most preferably 50 or less.

The in-plane retardation (Re) is represented by the following expression (1) based on the refractive index nx in the slow axis direction, which is the direction in which the in-plane refractive index of the sheet is the largest, the refractive index ny in the fast axis direction, which is the direction orthogonal to the slow axis direction, and the thickness t (nm) of the sheet. As is clear from the following expression (1), the degree of orientation is low when the in-plane retardation is small, and therefore bending resistance tends to be good. In-plane phase difference (Re) can be measured, for example, by a device manufactured by Otsuka electronics under the trade name "RETS-100".

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

The refractive index Nz of the Nz coefficient in the thickness direction of the sheet, nx, and ny are represented by the following expression (2).

Nz coefficient= (nx-Nz)/(nx-ny) … (2)

In the case of measuring the above Re using RETS-100, the measurement can be performed as follows. First, in order to stabilize the RETS-100 light source, the light source is left to stand for 60 minutes or longer after being lighted. Then, a rotation analyzer method is selected, and a θ mode (angular direction phase difference measurement mode) is selected. By selecting this θ mode, the table becomes a tilt rotation table.

Next, the following measurement conditions were inputted to RETS-100.

(measurement conditions)

Delay measurement range: rotary analyzer method

Measuring the diameter of the spot: phi 5mm

Tilt angle range: -40 DEG

Measurement wavelength range: 400nm to 800nm

The average refractive index of the sample (for example, n=1.617 in the case of PET, and 1.5 in the case of an acrylic film).

Thickness: thickness separately measured by SEM or optical microscopy

Then, the background data is obtained without setting a sample in the apparatus. The device is designed as a closed system which is implemented every time the light source is illuminated.

The sample is then placed on a stage within the device. The shape of the sample may be any shape, for example, may be a rectangular shape. The sample size may also be 50mm by 50mm. However, the sample is a sample cut from a portion (for example, a central portion of the sheet) separated by 35mm or more from each end of the sheet toward the inside of the sheet. In the case where there are a plurality of samples, it is necessary that all be disposed in the same orientation. For example, in order to set all samples in the same orientation, it is preferable to mark all samples in advance.

After setting the sample, the table was rotated 360 ° on the XY plane at a temperature of 23±5 ℃ and a relative humidity of 50±20%, and the fast axis and the slow axis were measured. After the measurement is completed, the slow axis is selected. Then, measurement was performed while tilting the optical disk around the slow axis in the angle range set in the table, and data (Re) of the set tilt angle range and the set wavelength range were obtained in units of 10 °. The in-plane retardation Re was set to a value at the time of measurement with light having an incident angle of 0℃and a wavelength of 589 nm. The in-plane phase difference Re is measured at 5 points at different positions. Specifically, first, as shown in fig. 10, 2 orthogonal virtual lines IL1, IL2 passing through the center A1 of the sample SA are drawn. When the virtual lines IL1, IL2 are drawn, the sample is divided into 4 partitions. Then, 1 point equidistant from the center A1 and a total of 4 points A2 to A4 are set in each of the zones, and measurement is performed at a total of 5 points of the center A1 and the points A2 to A4. Then, the arithmetic average of 3 points from which the maximum value and the minimum value are removed from the measured values of 5 points is taken as the in-plane phase difference Re.

The sheet 12 may have a single-layer structure or a laminated structure in which 2 or more layers are laminated. Specifically, the sheet 12 may be a base material monomer or a functional layer monomer, and may be, for example, a laminate (for example, an optical laminate) in which 1 or more functional layers are formed on a base material. In order to facilitate adhesion, there is also a substrate in which a base layer is formed on one or both surfaces of the substrate. The term "substrate" in the present specification is a concept including not only a substrate having no base layer but also a substrate having a base layer on one or both surfaces of the substrate. That is, in the present specification, when the base layer is formed on the substrate, a laminate of the substrate and the base layer is used as the substrate. However, the base layer in this case is a base layer in contact with the substrate, and does not include a base layer not in contact with the substrate. The thickness of the underlayer is usually 0.01 μm or more and 1.0 μm or less. In the present specification, the "functional layer" means a layer that intentionally performs a certain function in the laminate. Specifically, examples of the functional layer include a base layer, a hard coat layer, an impact absorbing layer, an antiglare layer, an antistatic layer, a conductive layer, a heat dissipation layer, an ultraviolet absorbing layer, a specific wavelength transmitting layer, a color reproducibility improving layer, a liquid crystal layer, a retardation adjusting layer, a viewing angle adjusting layer, a reflecting layer, a coloring layer, an antireflection layer (high refractive index layer, low refractive index layer), an antifouling layer, a water repellent layer, an oil repellent layer, and the like, or a combination thereof, which are not in contact with a substrate. 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 is also present when the sheet 12 is used, and does not include a release liner that is peeled off when used. If a release liner is present on a sheet, defects are likely to occur, and a new step different from the above-described step is likely to occur. If the release liner is provided on the sheet 12, the release liner is wound around the winding core 11 in a state of being released.

The use of the sheet 12 is not particularly limited, and examples thereof include optical use (optical film use, polarizing plate use, display device use), door and window use, automotive interior trim use, battery part use, food packaging material use, agricultural use, cosmetic use, design use, medical use, and the like. Among them, the technique of the present invention is particularly effective in optical applications because it is possible that the film for optical applications may have an influence not only on the appearance but also on the light transmittance if there is a step caused by the winding start end of the sheet material or a step caused by the fixing member.

The sheet 12 includes a winding start end 12A (see fig. 3) and a winding end 12B (see fig. 1). In the winding body 10, the winding start end 12A is located closer to the winding core 11 than the winding end 12B. In the winding body 10, as shown in fig. 3, the distal end surface 12A1 of the winding start end portion 12A located in the longitudinal direction DR2 and the 2 nd end surface 17B of the fixing member 17, which will be described later, are substantially aligned in the radial direction DR3 of the winding core 11 (the normal direction of the outer peripheral surface 11A of the winding core 11). "substantially aligned" in this specification means: the distance between the distal end face 12A1 and the 2 nd end face 17B of the winding start end 12A in the longitudinal direction DR2 is within ±20% of the width W3 (see fig. 4) of the fixing member 17. The "+" mentioned above means that the end face 12A1 protrudes from the 2 nd end face 17B, and the "-" mentioned above means that the end face 12A1 is retracted from the 2 nd end face 17B (i.e., the 2 nd end face 17B protrudes from the end face 12 A1).

Fixing part

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. Thereby, 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 1 st end face 17A and a 2 nd end face 17B on the opposite side of the 1 st end face 17A. The 1 st end face 17A and the 2 nd end face 17B each extend in the width direction DR1 of the winding core 11. The 2 nd end surface 17B is located closer to the winding start end portion 12A than the 1 st 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 12A of the sheet 12, and fixes the winding start end 12A of the sheet 12 to the outer peripheral surface 11A of the winding core 11. In addition, if the sheet 12 is at week 1, the sheet 12 may be fixed at a portion other than the winding start end portion 12A. In fig. 3, the front surfaces of the fixing members 17 are all in close contact with the winding start end portion 12A, but as in the case of the roll 40 shown in fig. 9, the 1 st filling portion 14 and the 1 st exposure suppressing member 18 may be interposed between the winding start end portion 12A and the fixing members 17 as long as the winding start end portion 12A is fixed to the fixing members 17 to such a degree that it does not cause a problem at the time of winding, for example, to such a degree that the winding start end portion 12A does not separate from the fixing members 17 at the time of winding.

The fixing member 17 is not particularly limited, and may be an adhesive member, a double-sided tape, or the like. 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 5mm or more and 100mm or less. If the width W3 of the fixing member 17 is 5mm 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 100mm or less, the sheet 12 can be wound without wrinkling the sheet 12. The "width of the fixing member" in the present specification means a distance from the 1 st end face to the 2 nd end face. The lower limit of the width W3 of the fixing member 17 is preferably 10mm or more, 20mm or more, or 30mm or more, and the upper limit is preferably 50mm or less, or 40mm 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, 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 and taking an arithmetic average of the thicknesses at 10.

< 1 st gap >)

The 1 st gap 13 is a gap that contacts the distal end surface 12A1 of the winding start end portion 12A in the longitudinal direction DR 2. Specifically, the 1 st gap 13 shown in fig. 3 is a gap surrounded by the outer peripheral surface 11A of the winding core 11, the back surface 12C of the 1 st sheet 12, the tip end surface 12A1 of the winding start end portion 12A, and the 2 nd end surface 17B of the fixing member 17. When the fixing member 17 is not provided, the 1 st gap is a gap surrounded by the outer peripheral surface of the winding core, the back surface of the 1 st sheet, and the distal end surface of the winding start end.

The 1 st gap 13 is a gap in contact with the end surface 12A1, and is also a gap between the winding core 11 and the 1 st sheet 12 and in contact with the 2 nd end surface 17B, and is therefore also a 3 rd gap described later.

< gap 2 >)

The 2 nd gap 15 is a gap in contact with the 1 st end face 17A of the fixing member 17. Specifically, the 2 nd 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 1 st sheet 12, and the 1 st end surface 17A of the fixing member 17.

< 1 st filling part >)

The 1 st filling portion 14 fills the 1 st gap 13. That is, the 1 st filling portion 14 is in contact with the outer peripheral surface 11A of the winding core 11, the back surface 12C of the 1 st sheet 12, the distal end surface 12A1 of the winding start end portion 12A, and the 2 nd end surface 17B of the fixing member 17. When the fixing member 17 is not provided, the 1 st filling portion is in contact with the outer peripheral surface of the winding core, the back surface of the 1 st sheet, and the distal end surface of the winding start end portion. The term "filling" as used herein refers to a state in which the gap is substantially filled with a material constituting the filling portion. However, a void may be provided in the filling portion.

The sheet 12 has: an effective region R1 (see fig. 2) used as a product; and inactive regions R2 (see fig. 2) which are located on both sides of the active region R1 in the width direction DR1 of the winding core and are not used as products, the 1 st filling portion 14 being present at least in the active region R1. Since the effective region R1 is a region used as a product, it is preferable that the 1 st filling portion 14 is present in the entire effective region R1 in the width direction DR1 of the winding core 11. Further, since the non-effective region R2 is a region that is not used as a product, the step difference does not need to be alleviated, and therefore, there is no problem even if the 1 st filling portion 14 is not present in the non-effective region R2. The inactive region R2 also varies depending on the use of the sheet and the width of the sheet, but is generally a region within 10mm to 30mm from both ends in the width direction of the sheet.

Regarding the edge thickness T1 (see fig. 4) of the distal end portion 14B on the separation position P1 side of the 1 st sheet 12 of the 1 st filling portion 14 from the winding core 11, if the thickness is thick, a new step may be formed due to the thickness, and thus, it is preferable to be thin. Specifically, for example, the edge thickness T1 is preferably 50 μm or less. The edge thickness T1 is more preferably 30 μm or less, 20 μm or less, 10 μm or less, 5 μm or less, and still more preferably 2 μm or less, from the viewpoint of shortening the deformation relaxation length, which is the distance from the winding start end portion 12A to the point where the deformation due to the step difference of the winding start end portion 12A becomes invisible. The more the step caused by the winding start end portion is relaxed, the more the deformation of the sheet caused by the step is relaxed, and therefore the deformation relaxing length becomes shorter. In the present specification, the term "deformation alleviating length" is used in a sense of a length up to a point where deformation of the sheet due to a step caused by a winding start end portion is alleviated, and a sense of a length up to a point where deformation of the sheet due to a step caused by a fixing member becomes invisible in some cases. When the deformation reducing length is used in the sense of a length up to the point where the sheet deformation due to the step difference caused by the fixing member becomes invisible, the deformation reducing length is a distance from the winding start end portion 12A to the point where the deformation due to the step difference of the fixing member 17 becomes invisible. The deformation relaxing length is preferably short, specifically, preferably 100m or less, 75m or less, 60m or less, 50m or less, 35m or less, 20m or less, or 15m or less. Further, if the deformation alleviating length is 75m or less, the sheet deformation is more likely to be visually recognized, and therefore, the sheet deformation is preferable. As described above, the deformation alleviating length is a length until deformation of the sheet due to the step is not visually recognized, but whether or not the step is present is determined as follows. First, in an indoor environment of 800Lux or more and 2000Lux or less, a white light source tube (for example, a 40W straight tube LED (power consumption: 18W, total luminous flux: 3100Lm, color temperature: 5000K)) such as a white LED lamp or a white fluorescent material is projected onto a long sheet, a portion where the outline of the white light source tube projected onto the sheet is deformed compared with other portions of the sheet is determined to have a step, and a portion where the outline of the white light source tube projected onto the periphery of the step is determined to be the same as the other portions of the sheet is determined to have no step. The white light source tube is disposed so that the longitudinal direction of the white light source tube extends along the longitudinal direction of the sheet. The length of the white light source tube can be changed depending on the width and length of the sheet. Specifically, the length of the white light source tube is preferably the length of the portion having a step and the portion having no step in the sheet. Thus, the portion having the step is easily known. In addition, if the observation environment is the brightness as described above, the white light source tube itself may be lighted or may not be lighted. In the observation, it is important that the white light source tube is reflected in the sheet and the outline thereof can be seen. Therefore, one of the contour lines of the white light source tube can be clearly seen as the observation condition is appropriately selected. For example, in the case where the outline of the white light source tube is more easily seen on the back surface of the sheet than on the front surface of the sheet, it is possible to check whether or not there is a step by reflecting the white light source tube on the back surface of the sheet. Specifically, for example, in the case of a laminate in which a functional layer, such as an antiglare layer, which is not easily reflected by a white light source tube is laminated on the front surface side of a base material, it may be difficult to confirm whether or not there is a step when viewed from the antiglare layer side. In this case, therefore, it is possible to check whether or not there is a step by reflecting the white light source tube on the back surface side of the base material where the antiglare layer is not laminated. The determination may be applied to a laminate in which 1 or more functional layers are laminated on a substrate, a laminate in which a polarizing sheet is attached, or a roll for various purposes. For example, when an antiglare layer is laminated on a substrate as a functional layer, the antiglare layer can be judged as follows: for a portion having a step, the uneven shape that exhibits an antiglare function under pressure appears to be crushed to generate coloring such as shading. In the case where various functional layers are laminated and the white light source tube is difficult to be reflected on the viewing side surface or the opposite surface of the roll body, the judgment can be made as described above by: the coloring different from other portions is seen by shading or the like due to the shape change.

In addition, in the case where the sheet 12 is a film having a thickness of 3 μm or more and less than 50 μm, the sheet is more susceptible to the step difference caused by the winding start end 12A than in the case of a thick film, and therefore, in the case of using such a film, the edge thickness T1 is preferably 10 μm or less, and in terms of minimizing the deformation alleviation length, it is more preferably 7 μm or less, 5 μm or less, and further preferably 1 μm or less. The lower limit of the edge thickness T1 may be 0.1 μm or more, 0.3 μm or more, or 0.5 μm or more.

The edge thickness T1 is preferably the thickness described above from the viewpoint of minimizing the deformation alleviation length, but the following may be the case: the surface of the winding core is subjected to surface finishing so that irregularities are present. Since the material constituting the 1 st filling portion is embedded along the irregularities in the distal end portion of the 1 st filling portion, there is a possibility that the portion having the edge thickness T1 and the portion having no edge thickness T1 may become uneven. However, if the edge thickness T1 is small, even if such unevenness occurs, no actual damage is caused. Therefore, when irregularities are present and uneven, the edge thickness T1 is preferably thin, and specifically, for example, the edge thickness T1 is preferably 15 μm or less, 10 μm or less, 5 μm or less, or 1 μm or less. The lower limit of the edge thickness T1 in this case 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 winding core is often reused after the winding body is used. Therefore, reworkability as follows is required for the winding core: the core is reused by peeling the filling portion, such as the 1 st filling portion, that is in contact with the core from the core, or by removing the filling portion by washing or wiping. Therefore, for example, the 1 st filling portion 14 is preferably not bonded to the winding core 11 as will be described later. In addition, at the portion where the 1 st filling portion 14 is in contact with each of the winding core 11 and the sheet 12, the sheet 12 is preferably cleanly peeled from the 1 st filling portion 14. If the 1 st filling portion 14 is broken by aggregation when the sheet 12 is peeled from the 1 st filling portion 14, it may be difficult to cleanly peel all of the 1 st filling portion 14 from the winding core 11. In contrast, if the edge thickness T1 is present, the sheet 12 is at the start of peeling, and therefore, from the viewpoint of reworkability, it is preferable that the edge thickness T1 is intentionally present. For example, from the viewpoint of reworkability, the edge thickness T1 is preferably 5 μm or more. The edge thickness T1 may be 1.5 μm or more, and further 5 μm or more, depending on the material of the winding core and the sheet, and the preferable thickness varies. The upper limit of the edge thickness is preferably 30 μm or less because a new step may be formed due to the thickness.

Regarding the measurement of the edge thickness T1, the measurement can be performed using a scanning type optical interferometry surface shape measuring instrument. Examples of such a surface shape measuring instrument include the "New View" series manufactured by Zygo corporation.

Specifically, the edge thickness T1 can be obtained as follows using a scanning optical interferometry surface shape measuring instrument (product name is "New View7300", manufactured by Zygo corporation). First, when all the sheets are fed out, the 1 st filling portion 14 may be attached to the sheet 12 side and peeled off from the winding core. When the 1 st filling portion 14 is attached to the fed sheet 12 side, 1 or more samples having a size of 0.5mm square or more including the distal end portion 14B of the 1 st filling portion 14 are obtained from the sheet. The sample is not limited to a square as long as it is 0.5mm square or more, and may be rectangular (for example, 2mm×5 mm). The sample is cut from any portion including the 1 st filling portion 14, to which dirt, fingerprint, or the like is not attached. Then, the edge thickness T1 of the 1 st filling portion 14 is measured under the following measurement conditions. The edge thickness T1 can be found by: the edge thickness at 10 was measured, and the arithmetic average of the thicknesses at 8 positions was obtained after the maximum value and the minimum value were removed from the measured thicknesses at 10 positions.

(measurement conditions)

Objective lens: 10 times of

Zoom:1 time of

Measurement area: 2.17mm by 2.17mm

·scan Length：5μm

·min mod：0.015

The thickness T2 (see fig. 4) of the 1 st filling portion 14 at the position where it contacts the distal end surface 12A1 is preferably thicker than the sum of the thicknesses of the fixing member 17 and the sheet 12 when the fixing member 17 is present, and is preferably thicker than the thickness of the sheet 12 when the fixing member 17 is not present. By setting the thickness T2 to such a thickness, the step caused by the winding start end 12A can be more effectively alleviated. However, if the thickness T2 is too large, the step difference due to the winding start end 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 when the thickness of the sheet 12 is 3 μm or more and less than 50 μm, the thickness T2 is preferably 50.5 μm or more and 100 μm or less.

The thickness T2 of the 1 st filling portion 14 at the position contacting the distal end face 12A1 can be measured as follows. Regarding the thickness T2, the measurement method may be different in the case where the 1 st sandwiching portion 20 is present and in the case where the 1 st sandwiching portion 20 is not present. The measurement can be performed using a laser displacement meter or a physical microscope when the 1 st sandwiching portion 20 is not present, and the measurement can be performed using a physical microscope when the 1 st sandwiching portion 20 is present. The measurement of the thickness T2 based on a laser displacement meter or a solid microscope is performed in an environment having a temperature of 23±5 ℃ and a relative humidity of 50±20%.

The measurement based on the thickness T2 of the laser displacement meter can be performed as follows. The following measurement method is particularly effective when the sheet 12 is transparent and the 1 st filling portion is opaque (for example, when it is colored) because reflection of laser light is used. First, a jig for rotating the roll 10 and a laser displacement meter (for example, product name "LK-G30", manufactured by KEYENCE corporation) are prepared, and they are disposed at predetermined positions, respectively. The jig is inserted into the hole 11B in the width direction DR1 of the winding core 11 to rotatably hold the winding body 10. In addition, LK-G30 is exemplified as the laser displacement meter, but a laser displacement meter of the same type as a subsequent type may be used even if not LK-G30.

The laser displacement meter includes a laser light source and a light receiving element, and is a device capable of receiving laser light irradiated from the laser light source and reflected on the surface of the 1 st filling portion 14 by the light receiving element, and measuring displacement based on the light receiving position in the light receiving element.

The laser displacement meter is located above the roll 10, and 3 laser beams are arranged so as to irradiate the surface of the roll 10. The arrangement of the laser displacement meter is as follows. First, as shown in fig. 11, the 1 st position B1 and the 2 nd position B2 which halve the width of the sheet 12 are determined. The 1 st position B1 is located on the 1 st end 12G1 side in the width direction of the sheet 12 (the width direction DR1 of the winding core 11), and the 2 nd position B2 is located on the 2 nd end 12G2 side on the opposite side of the 1 st end 12G 1. The 1 st laser displacement meter is disposed so as to irradiate the laser beam to the midpoint C1 between the 1 st position B1 and the 1 st end 12G1, the 2 nd laser displacement meter is disposed so as to irradiate the laser beam to the midpoint C2 between the 1 st position B1 and the 2 nd position B2, and the 3 rd laser displacement meter is disposed so as to irradiate the laser beam to the midpoint C3 between the 2 nd position B2 and the 2 nd end 12G 2.

Then, the roll 10 is attached to a jig, and the sheet 12 is fed out until the 1 st filling portion 14 is exposed from the roll 10. Then, in a state where the 1 st filling portion 14 is exposed, the displacement amount is continuously measured at a sampling period of 200 μs by the laser displacement meter while rotating the winding core 11 at a rotation speed of 30mm/s, and a graph (see fig. 12) is obtained in which the horizontal axis is set as the position (mm) and the vertical axis is set as the displacement amount (mm). This measurement is performed from the distal end portion 14B of the 1 st filling portion 14 toward the position in contact with the distal end surface 12A1, and in this measurement, the reference height (a line with a displacement of 0 mm) is used as the height of the winding core 11, and the difference between the reference height and the displacement of the 1 st filling portion 14 is used as the thickness of the 1 st filling portion 14. In the graph, the 1 scale on the horizontal axis is 5mm, and the 1 scale on the vertical axis is 0.02mm.

In this graph, the displacement amount increases from the tip end portion 14B at the portion where the 1 st filling portion 14 exists, but the displacement amount decreases rapidly after the position of the 1 st filling portion 14 in contact with the tip end surface 12 A1. Therefore, the position E1 on the position shift curve in which the displacement amount starts to drastically decrease is found in the graph. Then, the difference between the line having a displacement of 0mm and the displacement of the position E1 is obtained, whereby the thickness T2 at the position of the 1 st filling portion 14 in contact with the distal end surface 12A1 is obtained.

The measurement based on the thickness T2 of the solid microscope can be performed as follows. First, the portion including the winding start end portion 12A, the 1 st filling portion 14, and the 2 nd week sheet 12 is selected and fixed so as not to be crushed. Then, the cross section of the fixed portion is polished, and the thickness T2 of the 1 st filling portion 14 is measured by a solid microscope (for example, product name is "digital microscope VHX-7000", manufactured by KEYENCE). The solid state microscope is exemplified by a digital microscope VHX-7000, but a solid state microscope such as a successor model may be used instead of VHX-7000.

The 1 st filling portion 14 preferably contains a coloring material and a luminescent material. By including the 1 st filling portion 14 with the coloring material or the light-emitting material, the 1 st filling portion 14 can be easily visually checked when it overflows from the roll 10. In addition, the thickness, length, and the like of the 1 st filling portion 14 are easily checked.

When the 1 st filling portion 14 is colored, the color of the 1 st filling portion 14 is not particularly limited, but white, gray, or the like is preferable from the viewpoint that the presence of the 1 st filling portion 14 can be reliably grasped and that the components of the 1 st filling portion 14 are not easily noticeable even if they adhere to the winding apparatus.

When the 1 st filling portion 14 is colored, the 1 st filling portion 14 contains a coloring material. In the case where the 1 st filling portion 14 is a cured product of a coating material, the coloring material is preferably a material that does not inhibit curing. The coloring material may be any of a pigment and a dye, or may be any of an organic coloring material and an inorganic coloring material. Examples of the specific coloring material include titanium oxide, carbon black, and a mixture thereof.

When the 1 st filling portion 14 is colored, the content of the coloring material in the 1 st filling portion 14 is preferably 0.1 mass% or more and 50 mass% or less. If the content of the coloring material is 0.1 mass% or more, the 1 st filling portion 14 can be visually confirmed, and if it is 50 mass% or less, the reworkability of the 1 st filling portion 14 can be maintained well even if the coloring material is an inorganic material or an organic material.

When the 1 st 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 light storage material. When the 1 st filling portion 14 contains a fluorescent material or a light-storing material, the fluorescent material or the light-storing material in the 1 st filling portion 14 can be made to emit light by irradiating the 1 st filling portion 14 with light such as ultraviolet light or visible light.

The surface 14C (see fig. 5) of the 1 st filling portion 14 is preferably convex and protrudes upward. If the surface 14C is convex, the sheet 12 can be lifted up as compared with concave, which is concave, and thus the step can be relaxed. Whether or not the shape of the surface 14C is convex, which is convex upward, can be determined from a graph of a displacement curve, similarly to the thickness T2. Specifically, in the graph, first, the position of the 1 st filling portion 14 is higher than the height of the winding core 11, and therefore the displacement amount increases. The position E2 (see fig. 12) which is the intersection of the line of which the displacement amount is 0mm and the position displacement curve at the position where the displacement amount starts to rise is grasped. Then, a virtual line IL3 (see fig. 12) passing through the position E1 and the position E2 is drawn. If the proportion of the number of peaks of the position shift curve existing between the positions E1 and E2, which is higher than the virtual line IL3, is 50% or more, it can be determined that the shape of the surface 14C of the 1 st filling portion 14 is convex, which is convex upward, and if the proportion of the number of peaks of the position shift curve existing between the positions E1 and E2, which is lower than the virtual line IL3, is 50% or more, it can be determined that the shape of the 1 st filling portion 14 is concave, which is concave downward. When the virtual line IL3 overlaps the position shift curve, it is determined as a concave shape recessed downward. In the graph for determining the shape of the 1 st filling portion 14, the 1 st scale on the horizontal axis is 5mm, and the 1 st scale on the vertical axis is 0.02mm.

When the surface 14C of the 1 st filling portion 14 has an upwardly convex shape, the average distance D1 from the virtual line IL3 to the position shift curve in the longitudinal axis direction is preferably 0.003mm or more. When the average distance D1 is 0.003mm or more, the sheet 12 can be effectively lifted, and therefore the step difference can be further alleviated. The lower limit of the average distance D1 is more preferably 0.01mm or more. If the upper limit of the average distance D1 is excessively convex, the difference may cause a new step, and thus is preferably 0.1mm or less, more preferably 0.07mm or less. The average distance D1 is obtained by taking the virtual line IL3 as a reference point, reading 7 peaks protruding upward from the virtual line IL3, and averaging the values of 5 points from which the maximum value and the minimum value are removed. Further, the peak read is a mountain, and a larger portion is selected.

The slope of the horizontal axis of the graph of the virtual line IL3 with respect to the 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 still more preferably 0.0050 or more and 0.0060 or less. If the slope is 0.0050 or more, the coating material can be filled without sagging, and if it is 0.0060 or less, the coating material can be filled without largely bulging. The lower limit of the slope is preferably 0.0020 or more, 0.0030 or more, or 0.040 or more, and the upper limit is preferably 0.0130 or less, 0.0120 or less, or 0.0100 or less.

The thickness of the 1 st filling portion 14 preferably increases gradually from the vicinity of the separation position P1 toward the distal end face 12 A1. By changing the thickness of the 1 st filling portion 14 in this way, abrupt height changes of the sheet 12 in the radial direction DR3 (normal direction) of the winding core 11 can be suppressed, and thus the step caused by the winding start end portion 12A can be relaxed.

If the thickness of the 1 st filling portion changes sharply, there is a concern that: the deformation remains due to the thickness variation, and the step difference caused by the winding start end cannot be sufficiently alleviated. Therefore, it is preferable to secure a sufficient length of the 1 st filling portion with respect to the thickness of the sheet. However, in the case where other influences such as winding are caused by lengthening the length of the 1 st filling portion, the length of the 1 st filling portion is intentionally made shorter than the optimal state, and therefore, the deformation alleviation length is longer than the state having the optimal 1 st filling portion, but can be shortened than the state in which the 1 st filling portion is not provided. Therefore, in the case where the 1 st sandwiching portion 20 is present as shown in fig. 4, it is preferable that the ratio ((length l1+length L2)/thickness T2) of the sum of the length L1 (see fig. 4) of the 1 st filling portion 14 along the longitudinal direction DR2 of the sheet 12 and the length L2 (see fig. 4) of the 1 st sandwiching portion 20 along the longitudinal direction DR2 of the sheet 12 to the thickness T2 of the 1 st filling portion 14 at the position contacting the end face 12A1 is 90 or more. In the case where the 1 st sandwiching portion 20 is not present as shown in fig. 8, the ratio (length L1/thickness T2) of the length L1 (see fig. 8) of the 1 st filling portion 14 along the longitudinal direction DR2 of the sheet 12 to the thickness T2 of the 1 st filling portion 14 at the position where it contacts the distal end surface 12A1 is preferably 90 or more. From the viewpoint of shortening the deformation alleviating length, the lower limit of these ratios is preferably 100 or more, 110 or more, 120 or more, or 140 or more. The upper limit of the ratio is not particularly limited, and may be, for example, 1200 or less, 1000 or less, 800 or less, 500 or less, or 300 or less.

The length L1 is a length of the 1 st filling portion 14 from a position where the end surface 12A1 contacts to an end portion on the separation position P1 side along the longitudinal direction DR2 of the sheet 12. The length L2 is a length from a position directly above the end surface 12A1 of the sheet 12 in the longitudinal direction DR2 to an end portion on the side of a position where the sheet 12 on the 1 st week contacts the sheet 12 on the 2 nd week. The lengths L1 and L2 can be obtained from a graph of the displacement curve, similarly to the thickness T2. Specifically, first, the presence of the 1 st sandwiching portion is checked by a method described later. When the 1 st sandwiching portion is present, the above-mentioned position E1 and position E2 are found from the graph of the position shift curve. Next, a virtual line IL4 (see fig. 12) passing through the position E2 and perpendicular to the line having a displacement of 0mm is drawn. Next, when the intersection point of the virtual line IL4 and the line having the displacement of 0mm is set as 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. In addition, when the 1 st sandwiching portion is not present, the length L1 can be obtained by obtaining the distance between the position E2 and the position E3 by the above-described method.

From the viewpoint of reducing the step, the longer the length L1 is, for example, preferably 110 μm or more in the case where the thickness of the sheet 12 is 50 μm or more and 200 μm or less, and preferably 1mm or more, more preferably 10mm or more, in order to further reduce the deformation reducing length. However, if the length L1 is too long, it is difficult to form the convex 1 st filling portion protruding upward in the process, and there is a possibility that uneven thickness of the wavy form may occur in the 1 st filling portion, so the upper limit of the length L1 is preferably 100mm or less from the viewpoint of easily obtaining the convex 1 st filling portion 14 protruding upward and suppressing uneven thickness of the wavy form.

The above (length l1+length L2)/thickness T2 and length L1/thickness T2 can roughly represent the shape of the 1 st filling portion 14, but in order to more appropriately represent the shape of the 1 st filling portion 14 such as an upwardly convex shape, it is preferable to further use the area of the 1 st filling portion 14 on a plane including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11. Specifically, when the 1 st sandwiching portion 20 is present as shown in fig. 4, the ratio ((area s1+area S2)/thickness T2) of the total of the area S1 (see fig. 5) of the region R11 sandwiched between the outer peripheral surface 11A of the winding core 11 and the surface 14C of the 1 st filling portion 14 and the area S2 (see fig. 5) of the region R12 sandwiched between the outer peripheral surface 11A of the winding core 11 and the surface 20A of the 1 st sandwiching portion 20 to the thickness T2 of the 1 st filling portion 14 at the position contacting the end surface 12A1 in the plane including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11 is preferably 3.0 or more. The area S1 of the region R11 in fig. 5 represents the cross-sectional area of the 1 st filling portion 14. In fig. 5, the area S2 of the region R12 represents the sum of the cross-sectional area of the 1 st nip 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. Fig. 5 shows a state in which the 1 st filling portion 14 and the 1 st sandwiching portion 20 are exposed by peeling the sheet 12 from the 1 st filling portion 14 and the 1 st sandwiching portion 20. When the 1 st sandwiching portion 20 is not present, the ratio (area S1/thickness T2) of the area S1 of the region R11 sandwiched between the outer peripheral surface 11A of the winding core 11 and the surface 14C of the 1 st filling portion 14 to the thickness T2 of the 1 st filling portion 14 in the plane including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11 is preferably 3.0 or more. If these ratios are 3.0 or more, the total of the area S1 and the area S2 or the area S1 is large with respect to the thickness T2, and therefore the sheet 12 can be effectively lifted up by the 1 st filling portion 14, whereby the above-described step can be further alleviated. From the viewpoint of further reducing the above-described level difference, the lower limit of these ratios is preferably 4.0 or more, 5.0 or more, 6.0 or more, 7.0 or more, or 8.0 or more. The upper limit of the ratio is not particularly limited, and may be 50.0 or less, or 17.0 or less, for example.

The sum of the area S1 and the area S2, or the area S1 can be obtained as follows: in the region from the position E2 to the position E3, the product of the thickness at each measurement point and the width between each measurement points is obtained and summed up. The width between the measurement points can be obtained from the sampling period, the rotational speed of the winding core, and the outer diameter of the winding core. Specifically, the width between measurement points can be obtained by the following expression (3). In expression (3), d (μm) is the width between measurement points, Δt(s) is the sampling period, r (rpm) is the rotational speed of the winding core, Φ (mm) is the outer diameter of the winding core, and pi is the circumference ratio.

d＝ΔT×(r/60)×φ×π×1000…(3)

As described above, the winding core is often reused after the use of the winding body, and therefore reworkability is required. Therefore, the 1 st filling portion 14 is preferably not bonded to the winding core 11. If reworkability is good, the winding core is reusable after use of the winding body. The term "reusable state of the winding core" in the present specification means a state in which: by visually observing the entire outer peripheral surface of the winding core, no attachments that cause the step were present. The method of removal differs depending on the coating material used for the 1 st filling portion. In the case of a hard coating layer having a high crosslinking density as in the case of a hard coating layer for display device application, the thinner the thickness of the edge thickness T1, the easier the removal may be. On the other hand, in the case where the crosslinking density is not so high as to have rubber elasticity, the thicker the edge thickness T1 is, the easier it is to remove. In either case, it is sufficient to confirm that no attachments remain, which cause the step, by visual observation. In addition, "adhesion" in this specification is a concept including adhesion. The 1 st filling portion 14 can be easily peeled off by not adhering the 1 st filling portion 14 to the winding core 11, and thus has good reworkability. With respect to the 1 st filling portion 14, it is more preferable that the end of the 1 st filling portion 14 is opened by a blade-like member by cleaning or wiping the winding core 11 or by gradually peeling the end from the winding core 11 with a finger or the like so as not to damage the winding core 11. Further, the 1 st filling portion 14 preferably contains substantially no adhesive component.

The 1 st filling portion 14 can be formed by flowing or deforming the coating material. In the case where the coating material exhibits fluidity, the fluidity may not always be exhibited as long as the fluidity is exhibited before or at the time of winding the sheet.

The coating material is a coatable material, for example, having fluidity when coated or wound. Examples of the coating material having fluidity include not only a liquid but also a material that changes from a liquid to a solid, a solid or a curable material having fluidity by heating or the like. When the coating material is a curable material, the 1 st filling portion 14 is formed of a cured product of the curable material.

The coating material preferably has a shear viscosity of 500 Pa.s or less at a shear rate of 1/s at 25 ℃. For example, it is conceivable to adjust the shape of the coating material applied to the winding core before winding the sheet while spreading the coating material using a doctor blade or the like, but when spreading the coating material in such a process, a lot of effort is required. In contrast, if the shear viscosity of the coating material is 500pa·s or less, the coating material can be stretched into a desired shape by the pressure at the time of winding up the sheet, and thus a special step of stretching the coating material can be omitted. The shear viscosity is more preferably 200pa·s or less. The shear viscosity is preferably 300pa·s or less, 100pa·s or less, or 50pa·s or less from the viewpoint of making the coating material easily extensible.

On the other hand, from the viewpoint of shortening the deformation alleviation length, the shear viscosity is preferably 10pa·s or more and 75pa·s or less, more preferably 20pa·s or more and 50pa·s or less. If the shear viscosity is 10pa·s or more, the fluidity does not become excessively high, so that the deformation of the sheet 12 can be relaxed, and if it is 75pa·s or less, the deformation caused by the end portion of the 1 st filling portion can be suppressed.

Further, from the viewpoint of further suppressing the overflow of the coating material, it is preferable that the shear viscosity is 15pa·s or more, and further 20pa·s or more, because the overflow of the coating material from between the winding core 11 and the sheet 12 during coating can be reduced. The shear viscosity is preferably 60pa·s or more. If the shear viscosity is 60pa·s or more, the fluidity of the coating material is low, and the coating material can be reduced from overflowing between the winding core and the sheet due to the pressure at the time of coating and/or winding.

The shear viscosity of the coating material can be measured by using a dynamic viscoelasticity measuring device (for example, manufactured by Anton-Paar Japan, inc.). Specifically, the shear viscosity of the coating material was measured at a temperature of 25 ℃ and a relative humidity of 30 to 70% using parallel plates having a diameter of 25mm, and the shear viscosity of the coating material was measured at a shear rate of 1[1/s for 10 times, and the arithmetic average of 8 shear viscosities obtained by removing the maximum value and the minimum value from the measured 10 shear viscosities was obtained.

Examples of the coating material include curable polymer compositions, thermoplastic resins, oils, starches, adhesives, adhesion agents, and sols.

The coating material preferably contains no volatile components such as solvents. By making the coating material free of volatile components, the shape change such as cracks in the 1 st filling portion 14 is small, and sheet marks are less likely to occur.

The coating material is preferably a material having low fluidity in the state of the roll 10. The term "low fluidity in the state of the roll" as used herein means that the coating material does not overflow from the roll when the roll is conveyed or manufactured. In forming the 1 st filling portion 14 in the 1 st gap 13, it is necessary to be able to apply the coating material, but if the fluidity of the coating material is high in the state of the roll 10, the 1 st filling portion may overflow during transportation, manufacturing, or the like, and contamination may occur. In contrast, if the coating material is a material that can be applied when forming the 1 st filling portion 14 and has low fluidity in the state of the roll 10, the 1 st filling portion 14 can be formed in the 1 st gap 13, and overflow or contamination of the 1 st filling portion 14 can be suppressed. As a material that can be applied when forming the 1 st filling portion, but has low fluidity in the state of the roll 10, a curable polymer composition is exemplified.

When the coating material is a curable polymer composition, examples of the coating material include an ionizing radiation curable polymer composition (an ionizing radiation curable resin composition, an ionizing radiation curable rubber composition), a thermosetting polymer composition (a thermosetting resin composition, a thermosetting rubber composition), a room temperature curable polymer composition (a polymer composition cured at a room temperature of about 20 ° to 30 °) (a room temperature curable resin composition, a room temperature curable rubber composition) and the like.

Among the room temperature curable polymer compositions, there are, for example, a two-component curable polymer composition composed of a main agent and a curing agent, and a one-component curable polymer composition cured by moisture in air. Since the portion of the 1 st filling portion existing in the center of the sheet is substantially in a sealed state in a state where the sheet is wound, it is difficult for air to contact the portion, and there is a possibility that sufficient curing may not be performed. In contrast, in the two-component curable polymer composition, if the main agent and the curing agent are mixed, the reaction starts, and thus curing can be performed by only time management. The two-component curable polymer composition is preferable in that the two-component curable polymer composition has superior storage stability as compared with the one-component curable polymer composition.

Examples of the ionizing radiation-curable polymer composition include compositions containing compounds having an ethylenically unsaturated group such as a (meth) acryloyl group, a vinyl group, and an allyl group. Examples of the ionizing radiation to be irradiated when curing the ionizing radiation-curable polymer composition include visible light, ultraviolet light, X-ray, electron beam, α -ray, β -ray, and γ -ray.

Examples of the thermosetting polymer composition and the room temperature curable polymer composition include a polyurethane resin composition, an epoxy resin composition, and a silicone composition. Among them, a silicone composition can be preferably used. As the silicone composition, a silicone gel composition and a silicone rubber composition, which are both easy to alleviate the above-mentioned level difference and deformation, are preferable.

In the present specification, "silicone gel cured product (silicone gel)" formed by curing a silicone gel composition means a cured product having an organopolysiloxane as a main component and having a very low crosslinking density, and means a cured product obtained by curing a silicone gel composition based on JIS K2220:2013 (1/4 cone) a cured product having a penetration of 10 to 150. This corresponds to the process under JIS K6249:2003 is different from a so-called silicone rubber composition and a cured silicone rubber (rubber-like elastomer) in that the measured value (rubber hardness value) in the rubber hardness measurement is 0 and the rubber hardness is low (i.e., soft) to such an extent that the rubber hardness value is not effective.

The silicone rubber composition includes a one-component curable silicone rubber composition and a two-component curable silicone rubber composition. Among the one-component curable silicone rubber compositions are condensation reaction curable rubber compositions that cure at room temperature and addition reactive rubber compositions that cure 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. The ionizing radiation-curable rubber composition may be formed by modifying another resin in the silicone rubber composition. In the present invention, any curing method is possible, and among them, a two-component curable silicone rubber composition is preferable from the viewpoint of being uniformly curable and excellent in storage stability.

As the silicone rubber composition, for example, RTV (Room Temperature Vulcanizing) silicone rubber composition is cited. The RTV silicone rubber composition has a smaller shrinkage ratio than the ionizing radiation-curable polymer composition, has good dimensional stability, and has excellent fluidity before curing, and therefore, easily intrudes into the gap between the winding core 11 and the sheet 12 or the sheet 12, and has low fluidity after curing. Further, since the RTV silicone rubber composition has deep curability, it is easy to uniformly perform a curing reaction regardless of the thickness at the time of application. Further, since the composition is excellent in releasability, the cured product is easily peeled off and can be reused 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, according to a curing reaction mechanism. In the present invention, it is preferable to use the same. The condensation reaction curable RTV silicone rubber composition is preferable in that curing is not hindered, and the addition reaction curable RTV silicone rubber composition is preferable in that curing shrinkage is smaller. In the present invention, there is a tendency that: the thickness of the coating material required to alleviate the step increases as the curing shrinkage increases, so that it is preferable to use an addition reaction curable RTV silicone rubber composition particularly for thin sheets (for example, the thickness of the sheet 12 is 3 μm to 45 μm).

The RTV silicone rubber composition is preferably a liquid silicone rubber LSR (Liquid Silicone Rubber), since no special processing equipment is required.

In order to perform a desired function, the above-described various compositions may contain a functional component. For example, silicone rubber compositions are typically electrical insulators, and are therefore sometimes charged by contact with the winding core 11, sheet 12, or other substance. In this case, the silicone rubber composition may contain an electroconductive filler. This can prevent foreign matter such as dust from being mixed in, and thus can suppress the occurrence of the step.

Examples of the conductive filler to be mixed into the silicone rubber composition include carbon black (acetylene black, ketjen black), silver powder, silicon dioxide after gold plating, graphite, and conductive zinc oxide. In addition, in recent years, also developed ion conductive silicone rubber, can also use the ion conductive silicone rubber.

The silicone gel composition may contain any components within a range that does not impair the object of the present invention. Examples of the optional component include a reaction inhibitor, an inorganic filler, an organopolysiloxane that does not contain a silicon atom-bonded hydrogen atom and a silicon atom-bonded alkenyl group, a heat resistance imparting agent, a flame retardancy imparting agent, a thixotropic agent, a pigment, a dye, and the like.

The reaction inhibitor is a component for inhibiting the reaction of the above-described composition, and specifically, for example, acetylene-based, amine-based, carboxylate-based, phosphite-based, and other reaction inhibitors can be mentioned.

Examples of the inorganic filler include: inorganic fillers such as fumed silica, crystalline silica, precipitated silica, hollow filler, silsesquioxane, fumed titania, magnesium oxide, zinc oxide, iron oxide, aluminum hydroxide, magnesium carbonate, calcium carbonate, zinc carbonate, lamellar mica, carbon black, diatomaceous earth, and glass fiber; and a filler obtained by subjecting these fillers to surface hydrophobization treatment with an organosilicon compound, an organoalkoxysilane compound, an organochlorosilane compound, an organosilane nitrogen compound, and a low-molecular-weight siloxane compound. In addition, silicone rubber powder, silicone resin powder, and the like may be blended.

In order to prevent the coating material from flowing excessively and to prevent the coating material from flowing around the position (separation position) P1 where the sheet 12 on the 1 st week is separated from the outer peripheral surface 11A of the winding core 11, the viscosity of the coating material at the time of coating is preferably appropriately adjusted.

The coating material is coated in a linear shape, but the coating amount per unit width of the coating material is preferably an amount that can obtain the thicknesses T1 to T3 in the 1 st filling portion 14, respectively, within the above-described range. Specifically, for exampleThe lower limit of the coating amount per unit width of the coating material is preferably 0.2cm ³ And/m. If the coating amount of the coating material is too small, air may be mixed in, for example, when coating is performed by a syringe, or insufficient coating may occur when it is difficult to discharge the coating material from the syringe or when the sheet is advanced to perform coating, but if the coating amount is 0.2cm ³ And/m or more, such a situation can be suppressed. In addition, the upper limit of the coating amount per unit width of the coating material is preferably 3.5cm ³ And/m or less. If the coating amount of the coating material is too large, the coating material may drop due to its own weight or a new level difference may be generated, but if the coating amount is 3.5cm ³ And/m or less, this can be suppressed. The lower limit of the coating amount is more preferably 0.3cm ³ The upper limit of the coating amount is more preferably 2.0cm or more ³ Less than/m or 1.5cm ³ And/m or less.

< 2 nd filler >)

The 2 nd filling portion 16 fills the 2 nd gap 15. That is, the 2 nd 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 1 st end surface 17A of the fixing member 17. Further, a minute gap may exist between the 2 nd filling portion 16 and the 1 st end face 17A.

The 2 nd filling portion 16 is made of a coating material or, in the case where the coating material is a curable polymer composition, a cured product thereof. The coating material is the same as that described for the 1 st filling portion 14, and therefore description thereof is omitted. The coating material may be the same as that described for the 1 st filling portion 14, but may be different.

The thickness of the 2 nd filling portion 16 preferably gradually decreases from the 1 st end face 17A toward the 1 st periphery of the sheet 12 to the vicinity of the reaching position P2 of the outer peripheral face 11A of the winding core 11. By changing the thickness of the 2 nd filling portion 16 in this manner, abrupt changes in the height direction of the sheet 12 can be suppressed, and thus the step caused by the fixing member 17 can be alleviated.

< 1 st clamping part >)

Since the 1 st filling portion tends to be softer than the sheet, if the height of the 1 st filling portion at the position where it contacts the distal end surface of the winding start end portion is the same as the height of the upper surface of the winding start end portion, a step may occur at the corner between the distal end surface of the winding start end portion and the upper surface when winding the sheet. In contrast, when the 1 st sandwiching portion 20 is formed, the 1 st sandwiching portion 20 can absorb the difference in hardness between the 1 st filling portion 14 and the sheet 12, and therefore the step difference in the angle between the distal end face 12A1 of the winding start end portion 12A and the upper face 12A2 can be reduced. Further, the presence of the 1 st nip portion 20 suppresses concentration of stress on the step portion caused by the winding start end portion 12A, and can smooth deformation of the sheet 12 after the 3 rd week, so that the step portion can be relaxed.

The 1 st interposed portion 20 preferably includes a coloring material and a light-emitting material in the same manner as the 1 st filling portion 14. By including the 1 st sandwiching portion 20 with the coloring material and the light emitting material, the 1 st sandwiching portion 20 can be easily visually recognized when overflowed from the roll 10. In addition, the presence of the 1 st sandwiching portion 20 is easily confirmed. The coloring material and the light-emitting material contained in the 1 st interposed portion 20 are the same as those described in the column of the 1 st filled portion 14, and therefore, description thereof is omitted.

When the sheet 12 is transparent and the 1 st sandwiching portion 20 is colored, whether or not the 1 st sandwiching portion 20 is present can be easily confirmed by visual inspection. Specifically, first, the sheet 12 is fed out from the roll 10 until the surface becomes the sheet 12 of the 2 nd week. Then, in the roll 10 having the sheet 12 on the 2 nd week as the surface, the vicinity of the winding start end 12A was visually observed, and whether or not a colored portion was present at the winding start end 12A was observed. When the colored portion is present at the winding start end portion 12A, it can be determined that the 1 st sandwiching portion 20 is present, and when the colored portion is not present, it can be determined that the 1 st sandwiching portion 20 is not present.

Even when the sheet 12 is transparent and the 1 st sandwiching portion 20 includes a light emitting material, it is possible to easily confirm whether or not the 1 st sandwiching portion 20 is present by visual inspection as described above. When the light-emitting material emits light by irradiation with light such as ultraviolet light or visible light, the presence or absence of the 1 st interposed portion 20 is confirmed by irradiation with light.

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 1 st sandwiching portion 20 is preferably 2 μm or more and 110 μm or less. When the thickness T3 of the 1 st sandwiching portion 20 is within this range, the deformation alleviating length can be shortened while avoiding adverse effects on winding of the sheet 12. Even when the thickness T3 of the 1 st sandwiching portion 20 exceeds 110 μm, the deformation alleviating length can be shortened, but there is a possibility that the winding of the sheet 12 is 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 likely to be deformed by the step caused by the winding start end 12A than when the thickness of the sheet 12 is thicker. Therefore, the thickness T3 of the 1 st interposed portion 20 is preferably 0.5 μm or more and 50 μm or less. When the thickness T3 of the 1 st sandwiching portion 20 is within this range, the deformation alleviating length can be shortened while avoiding adverse effects on winding of the sheet 12.

The thickness T3 of the 1 st sandwiching portion 20 is set as the maximum thickness of the 1 st sandwiching portion 20. The thickness T3 of the 1 st sandwiching portion 20 is measured as follows. First, the winding start end 12A, the 1 st nip portion 20, and the 2 nd week sheet 12 are selected and fixed so that the portions are not crushed. Then, the section of the fixed portion is polished, and the thickness T3 of the 1 st sandwiching portion 20 is measured by a solid microscope (for example, product name is "digital microscope VHX-7000", manufactured by KEYENCE).

The 1 st sandwiching portion 20 is made of a coating material or, in the case where the coating material is a curable polymer composition, a cured product thereof. The coating material is the same as that described in the 1 st filling portion 14, and therefore description thereof is omitted. The coating material may be the same as that described for the 1 st filling portion 14, but may be different.

< 1 st exposure suppressing member)

The 1 st exposure suppressing member 18 is a member for suppressing the exposure of the end 14A of the 1 st filling portion 14 to the outside of the sheet 12 in the width direction DR1 of the winding core 11. The 1 st exposure suppressing member 18 of the present embodiment is a member for suppressing the end 14A of the 1 st filling portion 14 from overflowing to the outside of the sheet 12. That is, the 1 st exposure suppressing member 18 functions as a blocking member that blocks the end 14A of the 1 st filling portion 14 from overflowing to the outside of the sheet 12.

In order to suppress the end 14A of the 1 st filling portion 14 from overflowing to the outside of the sheet 12, as shown in fig. 2, the 1 st exposure suppressing member 18 is located outside the end 14A of the 1 st filling portion 14 in the width direction DR1 and is covered with the sheet 12. The 1 st exposure suppressing member 18 is disposed on the outer peripheral surface 11A of the winding core 11.

As shown in fig. 2, the 1 st exposure suppressing members 18 are respectively present on both sides of the 1 st filling portion 14 in the width direction DR 1. This can prevent the end portions 14A of the 1 st filling portion 14 from overflowing the sheet 12.

If the 1 st exposure suppressing member is present in the effective region, a portion where the 1 st filling portion is not present may be generated in the effective region of the sheet in the width direction of the winding core, and there is a possibility that a portion where the step cannot be effectively relaxed may be present. Therefore, as shown in fig. 2, the 1 st exposure suppressing member 18 is preferably located not in the effective region R1 but in the non-effective region R2.

If the 1 st filling portion 14 contacts the 1 st exposure suppressing member 18 under pressure when the sheet 12 is wound, the 1 st filling portion 14 tends to move along the 1 st exposure suppressing member 18. Therefore, if the 1 st exposure suppressing member has a short length in the circumferential direction of the winding core, the 1 st filling portion may bypass the 1 st exposure suppressing member and overflow. Therefore, it is preferable that the 1 st exposure suppressing member 18 extends along the circumferential direction DR4 (see fig. 7) of the winding core 11.

When the winding body 10 is viewed in plan (see fig. 2), if a gap is present between the end surface of the 1 st exposure suppressing member on the winding start end side, the winding start end and the fixing member, the 1 st exposure suppressing member can substantially suppress the overflow of the 1 st filling portion end, but the 1 st filling portion end may slightly overflow from the gap to the outside of the sheet. In contrast, if a part of the 1 st exposure suppressing member 18 is overlapped on the winding start end portion 12A as shown in fig. 2 and 6, the gap is less likely to be formed, and therefore, the end portion 14A of the 1 st filling portion 14 can be further suppressed from overflowing to the outside of the sheet 12, and the end portion of the 1 st sandwiching portion 20 can be suppressed from overflowing to the outside of the sheet 12. The 1 st exposure suppressing member 18 may be disposed so that the end surface on the winding start end portion 12A side of the 1 st exposure suppressing member 18 contacts the distal end surface 12A1 of the winding start end portion 12A and the 2 nd end surface 17B of the fixing member 17, but from the standpoint that the gap is difficult to be formed even with time change or the like and from the standpoint that the end portion of the 1 st sandwiching portion 20 is suppressed from overflowing, the 1 st exposure suppressing member 18 is preferably disposed so that a part of the 1 st exposure suppressing member 18 overlaps the winding start end portion 12A.

Preferably, the length L3 (see fig. 7) of the 1 st exposure suppressing member 18 in the circumferential direction DR4 of the winding core 11 is longer than the maximum length of the 1 st filling portion 14 in the circumferential direction DR 4. This can prevent the 1 st filler 14 from overflowing outside the sheet 12 by bypassing the 1 st exposure suppressing member 18. The length L3 of the 1 st exposure suppressing member 18 is preferably 10mm or more. If the length L3 of the 1 st exposure suppressing member 18 is 10mm or more, the 1 st filling portion 14 can be further suppressed from bypassing the 1 st exposure suppressing member 18. From the viewpoint of further suppressing the 1 st filling portion 14 from bypassing the 1 st exposure suppressing member 18, the lower limit of the length L3 of the 1 st exposure suppressing member 18 is more preferably 30mm or more, 50mm or more, 60mm or more, or 90mm or more. From the viewpoint of suppressing the overlapping of the 1 st exposure suppressing members 18, the upper limit of the length L3 of the 1 st exposure suppressing member 18 is preferably smaller than the outer circumference of the winding core 11, and may be, for example, a length obtained by subtracting 10mm from the outer circumference (mm) of the winding core 11. If the length L3 of the 1 st exposure-inhibiting member 18 is equal to or less than a length obtained by subtracting 10mm from the outer circumference (mm) of the winding core 11, the 1 st exposure-inhibiting member 18 can be reliably inhibited from overlapping each other, and thus a step caused by the 1 st exposure-inhibiting member 18 overlapping each other can be inhibited. The length of the 1 st exposure suppressing member in the circumferential direction of the winding core can be obtained as follows: the arithmetic average value of the lengths of 8 positions from which the maximum value and the minimum value are removed is obtained among the measured lengths of 10 positions, at 10 positions of the length measurement of the 1 st exposure suppressing member in the circumferential direction of the winding core.

The 1 st exposure suppressing member 18 preferably has a width W4 (see fig. 7) of 1mm or more in the width direction DR1 of the winding core 11. If the width W4 of the 1 st exposure suppressing member 18 is 1mm or more, the 1 st filling portion 14 stops on the 1 st exposure suppressing member 18 even when the 1 st filling portion 14 passes over the 1 st exposure suppressing member 18 as described later, and thus, overflow can be suppressed. From the viewpoint of further suppressing the overflow of the 1 st filling portion 14, the lower limit of the width W4 of the 1 st exposure suppressing member 18 is more preferably 5mm or more, 10mm or more, or 30mm or more. From the viewpoint of reducing the step mark caused by the 1 st exposure-inhibiting member 18, the upper limit of the width W4 of the 1 st exposure-inhibiting member 18 may be 50mm or less, 20m or less, or 5mm or less. The width of the 1 st exposure suppressing member in the width direction of the winding core can be obtained as follows: the width of the 1 st exposure suppressing member at 10 was measured, and the arithmetic average value of the 8-position width after the maximum value and the minimum value were removed out of the measured 10-position widths was obtained.

When the 1 st exposure suppressing member is thin, the 1 st filling portion may overflow beyond the 1 st exposure suppressing member. Therefore, the thickness T4 (see fig. 6) of the 1 st exposure suppressing member 18 at the position contacting the distal end surface 12A1 is preferably equal to or greater than the thickness T2 (see fig. 4) of the 1 st filling portion 14 at the position contacting the distal end surface 12 A1. This can prevent the 1 st filling portion 14 from overflowing beyond the 1 st exposure suppressing member 18.

The thickness T4 of the 1 st exposure suppressing member 18 at the position contacting the distal end face 12A1 is preferably 50 μm or more and 5000 μm or less. If the thickness T4 of the 1 st exposure suppressing member 18 is 50 μm or more, the 1 st filling portion 14 can be further suppressed from being passed over the 1 st exposure suppressing member 18. Further, if the thickness T4 of the 1 st exposure suppressing member 18 is 5000 μm or less, the occurrence of a new step caused by the 1 st exposure suppressing member 18 can be suppressed. From the viewpoint of being able to further suppress the 1 st filling portion 14 from passing over the 1 st exposure suppressing member 18, the lower limit of the thickness T4 of the 1 st exposure suppressing member 18 is more preferably 100 μm or more, 300 μm or more, or 500 μm or more. The upper limit of the thickness T4 of the 1 st exposure-inhibiting member 18 is more preferably 3000 μm or less, 2000 μm or less, or 1000 μm or less, from the viewpoint of further inhibiting the occurrence of a new step caused by the 1 st exposure-inhibiting member 18.

Preferably, the storage modulus of the 1 st exposure suppressing member 18 at 25 ℃ is equal to or less than the storage modulus of the 1 st filling portion 14 at 25 ℃. If the storage modulus of the 1 st exposure suppressing member is high, a gap may be generated between the 1 st exposure suppressing member and the winding core near the winding start end, and the 1 st filling portion may flow out of the gap, but if the storage modulus of the 1 st exposure suppressing member 18 is equal to or less than the storage modulus of the 1 st filling portion 14, the 1 st filling portion 14 may be suppressed from flowing out.

The storage modulus of the exposure control member 18 at 25℃is preferably 0.001MPa or more and 5MPa or less. When the storage modulus of the 1 st exposure suppressing member 18 is 0.001MPa or more, the outflow of the 1 st exposure suppressing member 18 can be further suppressed, and when the storage modulus of the 1 st exposure suppressing member 18 at 25 ℃ is 5MPa or less, the occurrence of a gap between the 1 st exposure suppressing member 18 and the winding core 11 in the vicinity of the winding start end 12A can be suppressed. The lower limit of the storage modulus of the 1 st exposure suppressing member 18 is preferably 0.001MPa or more, 0.005MPa or more, or 0.01MPa or more. The upper limit of the storage modulus of the 1 st exposure suppressing member 18 is preferably 3MPa or less, 1MPa or less, or 0.5MPa or less.

The storage modulus of the exposure suppressing member 18 at 25℃can be measured by using a dynamic viscoelasticity measuring device (for example, manufactured by Anton-Paar Japan, inc.). Specifically, first, a sample having a diameter of 10mm was cut out from the 1 st exposure control member. When a sample having a diameter of 10mm cannot be cut out from the 1 st exposure control member, a sample having a diameter of 10mm was produced using the same material as that constituting the 1 st exposure control member. The sample was then fixed on a parallel plate 8mm in diameter, and the storage modulus at a vibration frequency of 1[ rad/s ] was measured using a dynamic viscoelasticity measuring device in an environment where the temperature was 25℃and the relative humidity was 30% to 70%. The storage modulus of the 1 st filling portion 14 can also be measured in the same manner as the storage modulus of the 1 st exposure suppressing member 18.

Preferably, the density of the 1 st exposure suppressing member 18 at 25 ℃ is equal to or higher than the density of the 1 st filling portion 14 at 25 ℃. If the density of the 1 st exposure suppressing member is low, the 1 st filling portion may ooze out of the 1 st exposure suppressing member, but if the density of the 1 st exposure suppressing member 18 is equal to or lower than the density of the 1 st filling portion 14, such oozing out of the 1 st filling portion 14 can be suppressed.

Preferably, the 1 st exposure-inhibiting member 18 has a density of 0.01g/cm at 25 DEG C ³ The above. If the 1 st exposure-inhibiting member 18 at 25℃has a density of 0.01g/cm ³ As described above, the 1 st filling portion 14 can be prevented from oozing out of the 1 st exposure preventing member 18. The lower limit of the density of the 1 st exposure suppressing member 18 at 25℃is more preferably 0.03g/cm ³ Above, 0.05g/cm ³ Above or 0.1g/cm ³ The above. From the viewpoint of suppressing the 1 st exposure suppressing member 18 from becoming the deformation origin of the sheet 12, the upper limit of the density of the 1 st exposure suppressing member 18 at 25℃may be 0.5g/cm ³ Below, 0.4g/cm ³ Below, or 0.3g/cm ³ The following is given.

The density of the 1 st exposure suppressing member 18 at 23 ℃ can be measured as follows. First, a sample having a size of 1cm×1cm was cut out from the 1 st exposure control member. When the sample of the above size cannot be cut out from the 1 st exposure control member, the sample of the size of 1cm×1cm is obtained using the same material as that constituting the 1 st exposure control member. Then, the mass and thickness of the sample were measured at a temperature of 23℃and a relative humidity of 30% to 70%, and the density was determined from the mass (g)/thickness (cm). The density of the 1 st filling portion 14 at 23 ℃ can also be measured in the same manner as the density of the 1 st exposure suppressing member 18.

The 1 st exposure suppressing member 18 shown in fig. 2 is provided 1 on each of both sides of the 1 st filling portion 14, but may be provided 2 or more. By providing 2 or more 1 st exposure suppressing members 18, the 1 st filling portion 14 can be further suppressed from passing over the 1 st exposure suppressing members 18.

The constituent material of the exposure suppressing member 18 in item 1 is not particularly limited as long as it does not adversely affect the sheet, and examples thereof include resins, metals, rubbers, gels, tapes (including buffer tapes), clays, and papers. With these materials, handling and/or setting is facilitated. Among them, a resin or a tape is preferable from the viewpoint of facilitating handling and setting. In addition, when rubber or gel is used as the constituent material of the 1 st exposure-inhibiting member 18, the 1 st exposure-inhibiting member 18 itself can be deformed, and therefore, the occurrence of a new step caused by the 1 st exposure-inhibiting member 18 can be inhibited.

The resin may be a thermoplastic resin or a cured product of a curable resin composition. In the case where the resin is a cured product of the curable resin composition, the shape can be freely changed before the curable resin composition is cured, and thus the occurrence of a new step caused by the 1 st exposure suppressing member 18 can be suppressed.

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

Examples of the curable resin composition include: an ionizing radiation curable resin composition that cures by ultraviolet rays or electron beams, a thermosetting resin composition, a room temperature curable resin composition that cures at room temperature of about 20 ° to 30 ° celsius, a catalyst curable resin composition that cures by a catalyst, an anaerobic curable resin composition, and the like. The ionizing radiation-curable resin composition needs to be irradiated with ultraviolet rays or electron beams after application, and thus, from the viewpoint of facilitating curing, a thermosetting resin composition, a catalyst-curable resin composition, an anaerobic-curable resin composition, and the like are preferable.

The tape may be any of a tape having an adhesive on both sides, a tape having an adhesive on only one side, and a tape having no adhesive. In the case where the tape has an adhesive on both sides or only one side, the adhesive may be provided not only on the entire surface but also in part. The tape without an adhesive is preferable from the viewpoint of suppressing contamination of the sheet 12, but in this case, it is slightly difficult in terms of the process because the tape without an adhesive is sandwiched between the winding core and the sheet of week 1. Therefore, the adhesive is preferably partially provided.

Sheets are used for example for optical applications, and therefore, for paper, paper which is less prone to paper dust generation, such as cleaning paper, is preferred.

< 2 nd exposure suppressing means >

The 2 nd exposure suppressing member 19 is a member for suppressing the end 16A of the 2 nd filling portion 16 in the width direction DR1 of the winding core 11 from being exposed to the outside of the sheet 12. The 2 nd exposure suppressing member 19 of the present embodiment is a member for suppressing the end portion 16A of the 2 nd filling portion 16 from overflowing to the outside of the sheet 12. That is, the 2 nd exposure suppressing member 19 functions as a blocking member that blocks the overflow of the end portion 16A of the 2 nd filling portion 16.

In order to suppress the end 16A of the 2 nd filler 16 from overflowing to the outside of the sheet 12, as shown in fig. 2, the 2 nd exposure suppressing member 19 is located outside the end 16A of the 2 nd filler 16 in the width direction DR1 and is covered with the sheet 12.

The 2 nd exposure suppressing members 19 shown in fig. 2 are respectively present on both sides of the 2 nd filling portion 16 in the width direction DR 1. This can prevent the end portions 16A of the 2 nd filler 16 from overflowing the sheet 12.

The exposure suppressing member 19 of the 2 nd is preferably located in the non-effective region R2, not in the effective region R1, for the same reason as described in the column 1 st exposure suppressing member 18. The exposure suppressing member 19 of the 2 nd is preferably extended along the circumferential direction DR4 of the winding core 11 for the same reason as described in the column 1 st of the exposure suppressing member 18.

When the roll 10 is viewed in plan (see fig. 2), if a gap exists between the end surface of the 2 nd exposure suppressing member on the fixing member side and the 1 st end surface of the fixing member, the 2 nd exposure suppressing member can substantially suppress the overflow of the end portion of the 2 nd filling portion, but the end portion of the 2 nd filling portion may slightly overflow from the gap to the outside of the sheet. In contrast, as shown in fig. 2 and 6, if a part of the 2 nd exposure suppressing member 19 is overlapped on the fixing member 17, the gap is less likely to be formed, and therefore, the end 16A of the 2 nd filling portion 16 can be further suppressed from overflowing to the outside of the sheet 12. Further, the 2 nd exposure suppressing member 19 may be disposed so that the end surface of the 2 nd exposure suppressing member 19 on the side of the fixing member 17 contacts the 1 st end surface 17A of the fixing member 17, but from the viewpoint that the gap is difficult to be formed even with time, the 2 nd exposure suppressing member 19 is preferably disposed so that a part of the 2 nd exposure suppressing member 19 is overlapped on the fixing member 17.

Preferably, the length L4 (see fig. 7) of the 2 nd exposure suppressing member 19 in the circumferential direction DR4 of the winding core 11 is longer than the maximum length of the 2 nd filling portion 16 in the circumferential direction DR 4. This can prevent the 2 nd filling portion 16 from overflowing while bypassing the 2 nd exposure suppressing member 19. Further, since the 2 nd gap 15 is smaller than the 1 st gap 13, the 2 nd filling portion 16 is less likely to overflow than the 1 st filling portion 14. Therefore, the length L4 of the 2 nd exposure suppressing member 19 may be shorter than the length L3 of the 1 st exposure suppressing member 18.

The length L4 of the 2 nd exposure suppressing member 19 is preferably 1mm or more. If the length L4 of the 2 nd exposure suppressing member 19 is 1mm or more, the 2 nd filling portion 16 can be further suppressed from bypassing the 2 nd exposure suppressing member 19. From the viewpoint of further suppressing the 2 nd filler 16 from bypassing the 2 nd exposure suppressing member 19, the lower limit of the length L4 of the 2 nd exposure suppressing member 19 is more preferably 5mm or more, 10mm or more, or 50mm or more. From the viewpoint of suppressing the 2 nd exposure suppressing members 19 from overlapping each other, the upper limit of the length L4 of the 2 nd exposure suppressing members 19 is preferably smaller than the outer circumference of the winding core 11, and may be, for example, a length obtained by subtracting 10mm from the outer circumference (mm) of the winding core 11. If the length L4 of the 2 nd exposure suppressing member 19 is equal to or less than a length obtained by subtracting 10mm from the outer circumference (mm) of the winding core 11, the 2 nd exposure suppressing members 19 can be reliably suppressed from overlapping each other, and therefore, a step caused by the 2 nd exposure suppressing members 19 overlapping each other can be suppressed. The length of the exposure suppressing member in the circumferential direction of the winding core can be obtained as follows: the arithmetic average value of the lengths of 8 positions from which the maximum value and the minimum value are removed is obtained among the measured lengths of 10 positions, at 10 positions of the length measurement of the 2 nd exposure suppressing member in the circumferential direction of the winding core.

The width W5 (see fig. 7) of the 2 nd exposure suppressing member 19 in the width direction DR1 of the winding core 11 is preferably 1mm or more for the same reasons as those described in the column of the 1 st exposure suppressing member 18. From the viewpoint of further suppressing the overflow of the 2 nd filling portion 16, the lower limit of the width W5 of the 2 nd exposure suppressing member 19 is more preferably 5mm or more, 10mm or more, or 20mm or more. When the width W5 of the 2 nd exposure suppressing member 19 is large, the 2 nd exposure suppressing member 19 may enter the effective region R1, and a step may be generated due to the influence of the 2 nd exposure suppressing member 19 itself, but even if the width W5 of the 2 nd exposure suppressing member 19 is large, the step caused by the 2 nd exposure suppressing member 19 can be suppressed as long as the 2 nd exposure suppressing member 19 is exposed outside the sheet 12 so that the 2 nd exposure suppressing member 19 does not enter the effective region R1. In addition, by exposing the 2 nd exposure suppressing member 19 to the outside of the sheet 12, the overflow of the 2 nd filling portion 16 can be further suppressed. Therefore, the upper limit of the width W5 of the 2 nd exposure suppressing member 19 may be 35mm or less, 30mm or less, or 25mm or less. The width of the 1 st exposure suppressing member can be obtained as follows: the width of the exposure suppressing member at 2 nd of 10 was measured, and the arithmetic average value of the measured width at 8 positions out of the widths at 10 positions was obtained.

The thickness of the 2 nd exposure suppressing member 19 is preferably equal to or greater than the thickness of the 2 nd filling portion 16 for the same reasons as those described in the column 1 of the 1 st exposure suppressing member 18. The thickness of the 2 nd exposure suppressing member 19 is preferably 5 μm or more and 5000 μm or less. When the thickness of the 2 nd exposure suppressing member 19 is 5 μm or more, the 2 nd filling portion 16 can be further suppressed from passing over the 2 nd exposure suppressing member 19. In addition, when the thickness of the 2 nd exposure suppressing member 19 is 5000 μm or less, the occurrence of a new step caused by the 2 nd exposure suppressing member 19 can be suppressed. The lower limit of the thickness of the 2 nd exposure suppressing member 19 is more preferably 10 μm or more, 50 μm or more, or 100 μm or more, from the viewpoint of being able to further suppress the 2 nd filling portion 16 from passing over the 2 nd exposure suppressing member 19. The upper limit of the thickness of the 2 nd 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 occurrence of a new step caused by the 2 nd exposure suppressing member 19. The thickness of the exposure suppressing member 2 can be determined as follows: the thickness of the 2 nd exposure suppressing member at 10 was measured, and the arithmetic average value of the 8 th thickness after the maximum value and the minimum value were removed out of the measured thicknesses at 10 was obtained.

For the same reason as described in the column 1, the storage modulus of the 2 nd exposure suppressing member 19 at 25 ℃ is preferably not more than the storage modulus of the 2 nd filling portion 16 at 25 ℃.

The storage modulus of the 2 nd exposure suppressing member 19 at 25 ℃ is more preferably 0.001MPa or more and 5MPa or less. When the storage modulus of the 2 nd exposure suppressing member 19 is 0.001MPa or more, the outflow of the 2 nd exposure suppressing member 19 can be suppressed, and when the storage modulus of the 2 nd exposure suppressing member 19 is 5MPa or less, the occurrence of a gap between the 2 nd exposure suppressing member 19 and the winding core 11 in the vicinity of the winding start end 12A can be suppressed. The lower limit of the storage modulus of the 2 nd exposure control member 19 at 25℃is more preferably 0.003MPa or more, 0.005MPa or more, or 0.01MPa or more. The upper limit of the storage modulus of the 2 nd exposure suppressing member 19 at 25 ℃ is more preferably 3MPa or less, 1MPa or less, or 0.5MPa or less. The storage modulus of the 2 nd exposure suppressing member and the 2 nd filler at 25 ℃ can be measured by the same method as the storage modulus of the 1 st exposure suppressing member.

For the same reason as described in the column 1, the density of the 2 nd exposure suppressing member 19 at 25 ℃ is preferably not less than the density of the 2 nd filling portion 16 at 25 ℃.

Preferably, the density of the 2 nd exposure suppressing member 19 at 25℃is 0.01g/cm ³ The above. If the density of the exposure suppressing member 19 of the 2 nd is 0.01g/cm ³ As described above, the 2 nd filling portion 16 can be prevented from leaking out of the 2 nd exposure preventing member 19. In addition, if the density of the 2 nd exposure suppressing member 19 is 0.01g/cm ³ As described above, the variation of the 2 nd exposure suppressing member 19 due to the winding pressure can be suppressedThe overflow of the 2 nd filling portion 16 can be suppressed. The lower limit of the density of the 2 nd exposure suppressing member 19 at 23℃is more preferably 0.03g/cm ³ Above, 0.05g/cm ³ Above or 0.1g/cm ³ The above. From the viewpoint of suppressing the 2 nd exposure suppressing member 19 from becoming the origin of deformation, the upper limit of the density of the 2 nd exposure suppressing member 19 at 25℃may be 0.5g/cm ³ Below, 0.4g/cm ³ Below, or 0.3g/cm ³ The following is given. The densities of the 2 nd exposure-inhibiting member and the 2 nd filling portion at 25 ℃ can be measured by the same method as the density of the 1 st exposure-inhibiting member.

The constituent material of the 2 nd exposure suppressing member 19 is not particularly limited as long as it does not adversely affect the sheet, and examples thereof include the same materials as the 1 st exposure suppressing member 18.

Another roll body

In the roll 10, the end face 12A1 of the winding start end 12A of the sheet 12 and the 2 nd end face 17B of the fixing member 17 are substantially aligned in the radial direction DR3 of the winding core 11, but as in the roll 50 shown in fig. 13, the end face 12A1 of the winding start end 12A of the sheet 12 may protrude from the 2 nd end face 17B of the fixing member 17. In this case, the 2 nd filling portion 16 may be filled in the 2 nd gap 15 and located between the outer peripheral surface 11A of the winding core 11 and the back surface 12C of the 1 st sheet 12, the 3 rd filling portion 52 may be filled in the 3 rd gap 51 on the 2 nd end surface 17B side, and the 3 rd exposure suppressing member 53 may be provided outside the 3 rd filling portion 52 in the width direction DR1 of the winding core 11 (see fig. 14).

< 3 rd gap >)

The 3 rd gap 51 is a gap in contact with the 2 nd end surface 17B of the fixing member 17. Specifically, the 3 rd 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 1 st-week sheet 12, and the 2 nd end surface 17B of the fixing member 17.

< 3 rd filling part >)

The 3 rd filling portion 52 is the same as the 2 nd filling portion 16 except that it fills the 3 rd gap 51, and therefore, a description thereof will be omitted here.

< 3 rd exposure suppressing member)

The 3 rd exposure suppressing member 53 is the same as the 2 nd exposure suppressing member 19 except for the outside of the 3 rd filling portion 52 provided in the width direction DR1 of the winding core 11, and therefore, the description thereof will be omitted here.

In the roll 10, the 2 nd filling portion 16 is filled in the 2 nd gap 15, but from the viewpoint of alleviating the step difference caused by the winding start end portion 12A of the sheet 12, the 1 st filling portion 14 may be filled in the 1 st gap 13, and therefore, the 2 nd filling portion 16 may not be filled in the 2 nd gap 15 as in the roll 60 shown in fig. 15. The 2 nd gap 15 of the roll 60 becomes a hollow. In this case, the 2 nd gap 15 of the roll 60 becomes a hollow, so that the 2 nd filling portion does not overflow. Therefore, as shown in fig. 16, the 2 nd exposure suppressing member 19 does not need to be provided.

In the roll 10, the 1 st gap 13 is filled with the 1 st filling portion 14, but from the viewpoint of alleviating the step difference caused by the fixing member 17, the 2 nd gap 15 may be filled with the 2 nd filling portion 16, and therefore, the 1 st gap 13 may not be filled with the 1 st filling portion 14 as in the roll 70 shown in fig. 17. The 1 st gap 13 of the roll 70 becomes a hollow. In this case, the 1 st gap 13 of the roll 60 becomes a hollow, so that the 1 st filling portion does not overflow. Therefore, as shown in fig. 18, the 1 st exposure suppressing member 18 does not need to be provided.

The roll 10 includes 1 fixing member 17, but may include 2 or more fixing members as shown in fig. 19. In the roll 80 shown in fig. 19, a fixing member 81 is provided on the 1 st end surface 17A side of the fixing member 17 in addition to the fixing member 17. In the roll 80 shown in fig. 19, since the distal end face 12A1 of the winding start end portion 12A of the sheet 12 protrudes from the 2 nd end face 17B of the fixing member 17, it is preferable that the 2 nd gap 15 is filled with the 2 nd filling portion 16 and the 3 rd gap 51 is filled with the 3 rd filling portion 52 in order to suppress a step caused by the fixing member 17. In this case, the 3 rd exposure suppressing member 53 is preferably provided outside the 3 rd filling portion 52 in the width direction DR1 of the winding core 11 (see fig. 20).

In the same manner, in the roll 80 shown in fig. 19, in order to suppress the step caused by the fixing member 81, it is preferable that the 2 nd filling portion 83 is filled in a 2 nd gap 82 on the 1 st end surface 81A side of the fixing member 81, which will be described later, and the 3 rd filling portion 85 is filled in a 3 rd gap 84 on the 2 nd end surface 81B side of the fixing member 81. In this case, it is preferable that the 2 nd exposure suppressing member 86 (see fig. 20) is provided outside the 2 nd filling portion 83 in the width direction DR1 of the winding core 11, and the 3 rd exposure suppressing member 87 (see fig. 20) is provided outside the 3 rd filling portion 85.

< fixed part >)

The fixing member 81 has a 1 st end face 81A and a 2 nd end face 81B on the opposite side of the 1 st end face 81. The 1 st end face 81A and the 2 nd end face 81B each extend in the width direction DR1 of the winding core 11. The 2 nd end surface 81B is located closer to the winding start end portion 12A than the 1 st end surface 81A. The fixing member 81 is the same as the fixing member 17, and therefore, a description thereof is omitted here.

< gap 2 >)

The 2 nd gap 82 is a gap in contact with the 1 st end surface 81A of the fixing member 81. Specifically, the 2 nd 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 1 st sheet 12, and the 1 st end surface 81A of the fixing member 81.

< 3 rd gap >)

The 3 rd gap 84 is a gap in contact with the 2 nd end surface 81B of the fixing member 81. Specifically, the 3 rd 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 1 st-week sheet 12, and the 2 nd end surface 81B of the fixing member 81.

< 2 nd filling portion and 3 rd filling portion >)

The 2 nd filling portion 83 is the same as the 2 nd filling portion 16 except that it is filled in the 2 nd gap 82, and therefore, a description thereof is omitted here. The 3 rd filling portion 85 is the same as the 2 nd filling portion 16 except that it is filled in the 3 rd gap 84, and therefore, a description thereof is omitted here.

< 2 nd exposure suppressing member and 3 rd exposure suppressing member)

The 2 nd exposure suppressing member 86 is the same as the 2 nd exposure suppressing member 19 except for the outside of the 2 nd filling portion 83 provided in the width direction DR1 of the winding core 11, and therefore, the description thereof is omitted here. The 3 rd exposure suppressing member 87 is the same as the 2 nd exposure suppressing member 19 except for the outside of the 3 rd filling portion 85 provided in the width direction DR1 of the winding core 11, and therefore, the description thereof is omitted here.

The roll 10 includes the fixing member 17, but the roll 90 shown in fig. 21 and 22 may not include the fixing member 17.

In fig. 13, 15, 19, and 21, length L1, length L2, thickness T3, area S1, and area S2 are not shown, but in roll bodies 50, 60, 80, 90, 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 roll body 10.

The 1 st sandwiching portion 20 is provided in all of the rolls 50, 60, 80, 90, but the 1 st sandwiching portion may not be provided as in the roll 30 shown in fig. 8.

In fig. 15, the surface of the fixing member 17 is entirely in close contact with the winding start end portion 12A, but the 1 st filling portion 14 or the 1 st exposure suppressing member 18 may be interposed between the winding start end portion 12A and the fixing member 17 in the same manner as the roll 40 shown in fig. 9.

In the winding bodies 10, 50, 60, 80, 90, the 1 st exposure suppressing member 18 is disposed on the outer peripheral surface 11A of the winding core 11, but as shown in fig. 23 and 24, the 1 st exposure suppressing member 101 may be disposed on the sheet 12 side. In the roll 100 shown in fig. 23 and 24, the 1 st exposure suppressing member 101 is located outside the end 14A of the 1 st filling portion 14 in the width direction DR1 and is covered with the sheet 12, but is not disposed on the outer peripheral surface 11A of the winding core 11 but is disposed on the back surface 12C of the sheet 12. Specifically, side tapes extending in the longitudinal direction DR2 are attached to both ends of the back surface 12C of the sheet 12 in the width direction of the sheet 12 (the width direction DR1 of the winding core 11), and a part of the side tapes becomes the 1 st exposure suppressing member 101. Since both end portions of the sheet 12 are present in the non-effective region R2, the product does not have any problem 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 100 shown in fig. 23 and 25, the 2 nd exposure suppressing member 102 is located outside the end portion 16A of the 2 nd filling portion 16 in the width direction DR1 and is covered with the sheet 12, but is disposed not on the outer peripheral surface 11A of the winding core 11 but on the back surface 12C of the sheet 12. The 2 nd exposure suppressing member 102 is also a part of the side belt.

The 1 st exposure suppressing member 101 and the 2 nd exposure suppressing member 102 may be formed by coating instead of the side tape. When the 1 st exposure suppressing member 101 and the 2 nd exposure suppressing member 102 are formed by coating, they may be formed of the same material as that of the 1 st exposure suppressing member 18 and the 2 nd exposure suppressing member 19.

In the roll 10, the 2 nd filling portion 16 is filled in the 2 nd gap 15, but may be as follows in the roll 110 shown in fig. 27: the 2 nd gap 15 is not filled with the 2 nd filling portion 16, the 2 nd gap 15 becomes a hollow, and the 2 nd sandwiching portion 111 is provided in at least the region 12D corresponding to the 2 nd gap 15 between the sheets 12 after the 1 st week. In this case, it is preferable that the exposure suppressing member 112 (see fig. 26) is provided outside the end 111A of the 2 nd sandwiching portion 111 in the width direction DR1 of the winding core 11.

< 2 nd clamping part >)

The 2 nd nip portion 111 is provided between the sheets 12 after the 1 st week. Therefore, the sheet 12 is necessarily present on the 2 nd nip portion 111. The 2 nd sandwiching portion 111 extends in the width direction DR1 of the winding core 11.

The maximum thickness T5 (see fig. 28) of the 2 nd sandwiching portion 111 is preferably 0.01mm or more. If the maximum thickness T5 of the 2 nd sandwiching portion 111 is 0.01mm or more, the step difference caused by the fixing member 17 can be effectively alleviated. From the viewpoint of more effectively reducing the step, the maximum thickness T5 is more preferably 0.02mm or more, 0.03mm or more, or 0.04mm or more. On the other hand, if the maximum thickness T5 is too large, the step difference due to the fixing member can be alleviated, but there is a case where the winding of the sheet 12 is adversely affected. Therefore, the upper limit of the maximum thickness T5 is preferably 0.2mm or less or 0.1mm or less. The maximum thickness T5 of the 2 nd sandwiching portion 111 can be measured by the same method as the thickness T2 using a laser displacement meter or a solid microscope.

When the thickness of the 2 nd nip portion 111 is measured along the longitudinal direction DR2 of the sheet 12, the ratio of the length L5 (see fig. 28) from the end 111B of the 2 nd nip portion 111 to the position where the maximum thickness T5 of the 2 nd nip portion 111 is formed to the maximum thickness T5 of the 2 nd nip portion 111 (length L5/maximum thickness T5) is preferably 12 or more in the longitudinal direction DR 2. If the ratio is 12 or more, the remaining deformation in the vicinity of the end 111B of the 2 nd sandwiching portion 111 can be suppressed, and if the thickness of the 2 nd sandwiching portion is too thick, the winding body may be separated from the perfect circle at the time of winding, etc., and the winding property may be deteriorated, but if the ratio is 12 or more, the 2 nd sandwiching portion 111 is not too thick, and hence the winding property may be suppressed. Further, if the thickness of the 2 nd sandwiching portion is too large, there is a possibility that new deformation is generated by the 2 nd sandwiching portion, but if the ratio is 12 or more, generation of such new deformation can be suppressed. From the viewpoint of shortening the deformation alleviating length, the lower limit of the ratio is preferably 25 or more, 50 or more, 75 or more, 100 or more, 125 or more, 150 or more, 175 or more, or 200 or more. From the viewpoint of effectively reducing the step difference caused by the fixing member, the thicker the maximum thickness T5 of the 2 nd sandwiching portion 111 is, the more preferable, and therefore the upper limit of the ratio is, for example, preferably 2000 or less, 1000 or less, 500 or less, or 375 or less.

From the viewpoint of reducing the step, the longer the length L5 is, for example, preferably 5.0mm or more in the case where the thickness of the sheet 12 is 50 μm or more and 200 μm or less, and more preferably 7.0mm or more, and even more preferably 9.0mm or more, in order to further reduce the deformation reducing length. However, if the length L5 is too long, it is difficult to form the 2 nd sandwiching portion having a convex surface in the region R3 (see fig. 28) from the end 111B of the 2 nd sandwiching portion 111 to the position where the maximum thickness T5 is obtained in the machining, and there is a possibility that uneven thickness of the wave form is generated in the 2 nd sandwiching portion, so the upper limit of the length L5 is preferably 20mm or less from the viewpoint that the surface 111C of the 2 nd sandwiching portion 111 in the region R3 tends to be convex and uneven thickness of the wave form is suppressed.

The length L5 can be obtained from a graph of the displacement curve, similarly to the maximum thickness T5. Specifically, first, when the end 111B of the 2 nd sandwiching portion 111 is present, the displacement amount increases, and therefore, the 1 st position, which is the intersection of the line of 0mm displacement amount and the displacement curve at the position where the displacement amount starts to increase, is found from the graph of the displacement curve. Then, a virtual line passing through the position where the displacement amount is highest and perpendicular to the line where the displacement amount is 0mm is drawn. Then, the length L5 can be obtained by determining the distance between the 1 st position and the 2 nd position using the intersection of the virtual line and the line having a displacement of 0mm as the 2 nd position.

The length L5/maximum thickness T5 can roughly represent the shape of the 2 nd sandwiching portion 111, but in order to more appropriately represent the convex shape of the surface 111C, it is preferable to further use the cross-sectional area of the 2 nd sandwiching portion 111. Specifically, it is preferable that the ratio (cross-sectional area S3/maximum thickness T5) between the cross-sectional area S3 (see fig. 28) of the 2 nd sandwiching portion 111 and the maximum thickness T5 of the 2 nd sandwiching portion 111 from the end 111B to the position of the maximum thickness T5 is 2.5 or more in a plane (plane shown in fig. 28) including the longitudinal direction DR2 of the sheet 12 and the radial direction DR3 of the winding core 11. If the ratio is 2.5 or more, the cross-sectional area S3 of the 2 nd nip portion 111 is large with respect to the maximum thickness T5, and therefore the sheet 12 can be effectively lifted by the 2 nd nip portion 111, whereby the step can be further alleviated. From the viewpoint of further reducing the step, the lower limit of the cross-sectional area S3/maximum thickness T5 is preferably 3.0 or more, 3.5 or more, 4.0 or more, 5.0 or more, 5.5 or more, 6.0 or more, 6.5 or more, or 7.0 or more. The upper limit of the cross-sectional area S3/maximum thickness T5 is not particularly limited, and may be, for example, 20.0 or less, 17.5 or less, 15.0 or less, or 12.5 or less, or 10.0 or less. The cross-sectional area S3 is the cross-sectional area of the region R3 of the 2 nd sandwiching portion 111 (in fig. 28, the cross-sectional area of the region surrounded by the solid line in the 2 nd sandwiching portion 111) and can be obtained by: the product of the thickness at each measurement point and the width between each measurement point in the region from the 1 st position to the 2 nd position of the graph of the position shift curve is obtained and summed up.

The constituent material of the 2 nd sandwiching portion 111 is the same as that of the 2 nd filling portion 16, and therefore, a description thereof will be omitted here.

< exposure suppressing means >)

The exposure suppressing member 112 is a member formed by integrating a 1 st exposure suppressing member for suppressing exposure of the end portion 14A of the 1 st filling portion 14 and a 2 nd exposure suppressing member for suppressing exposure of the end portion 111A of the 2 nd sandwiching portion 111. The 1 st portion 112A of the exposure control member 112 shown in fig. 29, which corresponds to the 1 st exposure control member, is the same as the 1 st exposure control member 18, and therefore, the description thereof is omitted here. The 2 nd portion 112B of the exposure-inhibiting member 112 corresponding to the 2 nd exposure-inhibiting member shown in fig. 29 is a region 12D (see fig. 29) corresponding to at least the 2 nd gap 15 between the sheets 12 provided with the 2 nd sandwiching portion 111, and is the same as the 2 nd exposure-inhibiting member 19 except for the outside of the end 111A of the 2 nd sandwiching portion 111 provided in the width direction DR1 of the winding core 11, and therefore, the description thereof is omitted here. The exposure suppressing member 112 may be divided into a 1 st exposure suppressing member that suppresses exposure of the end portion 14A of the 1 st filling portion 14 and a 2 nd exposure suppressing member that suppresses exposure of the end portion 111A of the 2 nd sandwiching portion 111.

Method for manufacturing roll

The roll 10 can be manufactured by the following method, for example. Fig. 30 to 33 are diagrams schematically showing a process of manufacturing a roll according to the present embodiment. First, as shown in fig. 30 (a), the fixing member 17 is disposed on the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11.

After the fixing member 17 is disposed, as shown in fig. 30 (B), the 2 nd exposure suppressing members 19 are disposed along the circumferential direction DR4 of the winding core 11 at positions corresponding to the non-effective regions R2 of the sheet 12 on the outer peripheral surface 11A of the winding core 11. The 2 nd exposure suppressing member 19 is disposed so that a part of the 2 nd exposure suppressing member 19 is overlapped with the fixing member 17. The 2 nd exposure suppressing member 19 may be disposed so as to contact the 1 st end surface 17A of the fixing member 17. The 2 nd exposure suppressing member 19 may be disposed by coating using a coating device such as a dispenser or a syringe, but may be disposed by attaching a sheet or a tape.

After the 2 nd exposure suppressing member 19 is disposed, the coating material 201 is applied to the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11 between the 2 nd exposure suppressing members 19 as shown in fig. 31 (a) using an application device such as a dispenser or a syringe. The coating material 201 is applied in contact with the 1 st end face 17A of the fixing member 17. The coating material 201 may be applied so as to be close to the 1 st end face 17A of the fixing member 17.

After the coating material 201 is applied, as shown in fig. 31 (B), the winding start end portion 12A is arranged so that the sheet 12 covers the coating material 201. Specifically, the winding start end 12A of the sheet 12 is adhered to the fixing member 17, and the winding start end 12A is fixed to the outer peripheral surface 11A of the winding core 11 via the fixing member 17.

After the winding start end portion 12A of the sheet 12 is fixed to the fixing member 17, as shown in fig. 32 (a), the 1 st exposure suppressing members 18 are disposed on the outer peripheral surface 11A of the winding core 11 at positions corresponding to the non-effective regions R2 of the sheet 12 along the circumferential direction DR4 of the winding core 11. The 1 st exposure suppressing member 18 is disposed not only at the position where the 1 st gap 13 is formed but also at the position on the winding start end portion 12A. The 1 st exposure suppressing member 18 may be disposed by coating using a coating device such as a dispenser or a syringe, but may be disposed by attaching a sheet or a tape.

After the 1 st exposure suppressing member 18 is formed or arranged, the coating material 202 is applied along the width direction DR1 of the winding core 11 at a position of the outer peripheral surface 11A of the winding core 11 between the 1 st exposure suppressing members 18 and corresponding to the effective region R1 of the sheet 12 as shown in fig. 32 (B) using an application device such as a dispenser or a syringe. The coating material 202 is applied in contact with the 2 nd end surface 17B of the fixing member 17. The coating material 202 may be applied so as to be close to the 2 nd end face 17B of the fixing member 17.

Then, 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, and therefore the coating material 202 fills the 1 st gap 13 and the coating material 201 fills the 2 nd gap 15, thereby forming the 1 st filling portion 14 filled in the 1 st gap 13 and the 2 nd filling portion 16 filled in the 2 nd gap 15. Thereby, the roll 10 is obtained. In order to reliably spread and fill the coating material 202 or the like in the 1 st gap 13 or the like, when the sheet 12 exceeds 1000m, the sheet 12 is preferably wound by 1000m or more, and when the sheet 12 is less than 1000m, the entire length of the sheet 12 is preferably wound.

In the case where the coating materials 201 and 202 are curable polymer compositions, the curable polymer compositions are cured after the sheet 12 is wound for at least the 2 nd week. In the case where the curable polymer composition is a one-component curable polymer composition (moisture-curable polymer composition), the composition is cured by reacting with humidity in the air and leaving it at room temperature, and therefore can be cured without using a special device such as a heating device or an ionizing radiation irradiation device. In addition, in the case where the curable polymer composition is a two-component curable polymer composition, the curable polymer composition can be cured by mixing the main agent and the curing agent.

In the above-described production 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 winding the sheet 12. However, if the coating materials 201, 202 and the like are caused to flow before the sheet 12 is wound, the number of steps increases, and therefore it is preferable to cause the coating materials 201, 202 to flow by winding the sheet 12.

In the above, the coating material 202 is applied after the coating material 201 is applied, but for example, 2 coating devices may be used to simultaneously apply the coating materials 201 and 202.

In the above, the coating material 201 is applied so as to contact the 1 st end face 17A, and the coating material 202 is applied so as to contact the 2 nd end face 17B, but when the wettability of the coating material is high and the viscosity of the coating material is low, if the coating material is applied so as to contact the 1 st end face or the 2 nd end face, there is a possibility that: the coating material is impregnated between the winding start end and the fixing member, and wetly spreads between the winding start end and the back surface of the sheet. The coating material can be controlled to be in a preferable state, but if excessive dipping or wetting and spreading are present, curing occurs 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 band-shaped coating material), or when the wettability of the coating material is low, the following is highly likely to occur if the coating material or the coating material is disposed: that is, since curing occurs only in a state where the vicinity of the arrangement is wet-expanded, when the winding is performed in the subsequent step and the wet-expanded is insufficient, the material that is cured in a state where the vicinity of the winding start end is thick increases, and there is a concern that the level difference increases. Therefore, the coating material 201 is preferably applied so as to be close to the 1 st end face 17A of the fixing member 17, and the coating material 202 is preferably applied so as to be close to the 2 nd end face 17B of the fixing member 17. In the present specification, "close to" means a position significantly separated from the winding start end or the fixing member. For example, even if the coating material is a low-viscosity material, the distance from the winding start end or the fixing member is preferably 0.3mm or more. The separation distance is preferably 0.5mm or more, and from the viewpoint of making it the most stable, it is preferably 1mm or more. If the separation distance is too large, it is difficult to obtain an effect of reducing the step, and therefore, it is preferable to adjust the distance within a range in which the 1 st filling portion 14 of fig. 3 and the like can be completed. For example, the upper limit of the separation distance is preferably 10mm or less and 7mm or less, more preferably 5mm or less. In addition, when the viscosity of the coating material is low, the coating amount can be increased. The separation distance was determined as follows: the separation distance of 10 was measured, and the arithmetic average of the 8 separation distances after the removal of the maximum value and the minimum value among the measured separation distances of 10 was calculated.

In the case where the viscosity of the coating material is high, the coating material is difficult to spread, and therefore, it is preferable that the separation distance is small, and in the case where the viscosity of the coating material is low, if the separation distance is too small, a large amount of the coating material may be present on the fixing member, and if the separation distance is too large, the target gap may not be sufficiently filled due to spreading in other directions, and therefore, it is preferable that the separation distance is not too small and not too large.

In the above description, after the fixing member 17 is disposed on the outer peripheral surface 11A of the winding core 11, the coating material 201 is applied so as to be in contact with the 1 st end surface 17A of the fixing member 17, and then the coating material 202 is applied so as to be in contact with the 2 nd end surface 17B of the fixing member 17, but the coating of the coating materials 201, 202 and the disposition of the fixing member 17 may be performed in the following order of the following manufacturing methods (1) to (3). Among them, the following production method (2) is preferable.

The manufacturing method (1) is as follows: after the fixing member 17 is disposed on the outer peripheral surface 11A of the winding core 11, the coating material 201 is applied so as to form the above-described separation distance on the 1 st end surface 17A side of the fixing member 17, and thereafter, the coating material 202 is applied so as to form the above-described separation distance on the 2 nd end surface 17B side of the fixing member 17.

The manufacturing method (2) is as follows: after the coating material 201 is applied to the outer peripheral surface 11A of the winding core 11, the fixing member 17 is disposed so that the distance from the coating material 201 becomes the above-described separation distance, and thereafter the coating material 202 is applied to the side of the fixing member 17 opposite to the coating material 201 so that the distance from the fixing member 17 becomes the above-described separation 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 disposed so that the distance from the coating material 202 becomes the above-described separation distance, and then the coating material 201 is applied to the side of the fixing member 17 opposite to the coating material 202 so that the distance from the fixing member 17 becomes the above-described separation distance. By applying the coating materials 201 and 202 and disposing the fixing member 17 in this order, the coating materials 201 and 202 can be stably disposed with a separation distance, and the coating of the excessive coating materials 201 and 202 on the fixing member 17 can be suppressed, so that the occurrence of a new step on the fixing member 17 can be suppressed.

The manufacturing method (3) is as follows: the coating materials 201, 202 are applied to the outer peripheral surface 11A of the winding core 11 at predetermined intervals, and then the fixing member 17 is disposed between the coating materials 201, 202.

In the case of manufacturing the roll 110 shown in fig. 26, first, after the sheet 12 is fixed to the fixing member 17, the exposure suppressing member is arranged along the circumferential direction DR4 of the winding core 11 from the position of the outer peripheral surface 11A of the winding core 11 corresponding to the non-effective region R2 of the sheet 12. The exposure suppressing member 112 is disposed such that a part of the exposure suppressing member 112 is overlapped on the fixing member 17. The exposure suppressing member 112 may be disposed by coating using a coating device such as a dispenser or a syringe, but may be disposed by attaching a sheet or an adhesive tape. Then, the coating material 201 is applied between the exposure suppressing members 112 and in the region corresponding to at least the 2 nd gap 15 in the effective region R1 of the sheet 12 in the width direction DR1 of the winding core 11, and the coating material 202 is applied between the exposure suppressing members 112 so as to be in contact with the 2 nd end face 17B of the fixing member 17. After that, the sheet 12 is wound to form the 1 st filling portion 14 and the 2 nd sandwiching portion 111.

According to the present embodiment, since the 1 st filling portion 14 is filled in the 1 st gap 13, the portion of the sheet 12 on the 1 st circumference on the 1 st filling portion 14 can be gently lifted from the separation position P1 toward the distal end face 12 A1. This can alleviate the step caused by the winding start end 12A of the sheet 12.

According to the present embodiment, since the 2 nd filling portion 16 is filled in the 2 nd gap 15, the portion of the sheet 12 on the 1 st week on the 2 nd filling portion 16 can be gently lowered from the 1 st end face 17A toward the reaching position P2. This effectively alleviates the step caused by the fixing member 17.

In the roll 30, since the 3 rd gap 31 is filled with the 3 rd filling portion 32, the portion of the sheet 12 on the 1 st week on the 3 rd filling portion 32 can be gently lifted. This can more effectively alleviate the step caused by the fixing member 17.

If the sheet is deformed, there is a portion of the sheet that cannot be used as a product, and therefore the effective length of the sheet is compensated for in order to secure the effective length. That is, if the portion of the sheet that does not become a product due to deformation becomes long, sheet loss increases. In contrast, according to the present embodiment, the step difference caused by the winding start end portion 12A of the sheet 12 and the step difference caused by the fixing members 17 and 81 can be relaxed, so that the deformation of the sheet 12 can be suppressed. Thereby, sheet loss can be reduced.

According to the present embodiment, since the 1 st exposure suppressing members 18 and 101 are disposed outside the 1 st filling portion 14 in the width direction DR1 of the winding core 11, the 1 st filling portion 14 can be suppressed from overflowing the sheet 12, and the end portion 14A of the 1 st filling portion 14 can be suppressed from being exposed to the outside of the sheet 12. This can suppress contamination of the sheet 12.

According to the present embodiment, since the 2 nd exposure suppressing members 19 and 102 are disposed outside the 2 nd filling portion 16 in the width direction DR1 of the winding core 11, the 2 nd filling portion 16 can be suppressed from overflowing to the outside of the sheet 12, and the end 16A of the 2 nd filling portion 16 can be suppressed from being exposed to the outside of the sheet 12. This can suppress contamination of the sheet 12.

According to the present embodiment, in the roll body 110, the exposure suppressing member 112 is disposed outside the 1 st filling portion 14 and outside the 2 nd sandwiching portion 111 in the width direction DR1 of the roll core 11, so that the 1 st filling portion 14 and the 2 nd sandwiching portion 111 can be suppressed from overflowing to the outside of the sheet 12, and the end portion 14A of the 1 st filling portion 14 and the end portion 111A of the 2 nd sandwiching portion 111 can be suppressed from being exposed to the outside of the sheet 12. This can suppress contamination of the sheet 12.

[ embodiment 2 ]

Hereinafter, a roll body according to embodiment 2 of the present disclosure will be described with reference to the drawings. Fig. 34 is a perspective view of the roll of the present embodiment, fig. 35 is a plan view of the roll of fig. 34, fig. 36 is an enlarged view of a part of a section of a line VII-VII in the roll of fig. 35, fig. 37 is an enlarged view of a part of a section of a line VIII-VIII in the roll of fig. 35, fig. 38 is an enlarged plan view of a part of the roll of fig. 34, and fig. 39 is an enlarged view of a part of another roll of the present embodiment. Fig. 40 is a plan view of another roll of the present embodiment, fig. 41 is an enlarged view of a part of a cross section of line IX-IX in the roll of fig. 40, fig. 42 is an enlarged view of a part of a cross section of line X-X in the roll of fig. 40, and fig. 43 is an enlarged view of a part of a cross section of line XI-XI in the roll of fig. 40.

Roll body

The roll 120 shown in fig. 34 and 35 includes a core 11 and an elongated sheet 12 wound around an outer peripheral surface 11A of the core 11. As shown in fig. 36, the roll 120 includes: a 1 st filling portion 14 that fills in a 1 st gap 13 between the winding core 11 and the sheet 12; a 2 nd filling portion 16 that fills in a 2 nd gap 15 between the winding core 11 and the sheet 12; and a fixing member 17 for fixing a part of the sheet 12 to the winding core 11, and further includes: a pair of 1 st exposure suppressing members 121 that suppress exposure of the end 14A of the 1 st filling portion 14 in the width direction DR1 of the winding core 11 to the outside of the sheet 12; and a pair of 2 nd exposure suppressing members 122 that suppress the end 16A of the 2 nd filling portion 16 in the width direction DR1 of the winding core 11 from being exposed to the outside of the sheet 12.

The sheet 12 is wound around the winding core 11 more than once, for example, more than 2 times. The roll 120 may be provided with at least one of the 1 st exposure suppressing member 121 and the 2 nd exposure suppressing member 122, or may not be provided with both. Further, although the roll 120 includes the pair of 1 st exposure suppressing members 121, in the case where the 1 st exposure suppressing members 121 are provided, at least one 1 st exposure suppressing member 121 may be provided. Although the roll 120 includes a pair of the 2 nd exposure suppressing members 122, in the case of providing the 2 nd exposure suppressing members 122, at least one of the 2 nd exposure suppressing members 122 may be provided.

The roll 120 further includes a 1 st nip portion 20 provided continuously with the 1 st filling portion 14 and interposed between the 1 st sheet 12 and the 2 nd sheet 12. The roll 120 includes the 1 st sandwiching portion 20, but the 1 st sandwiching portion may not be provided.

< 1 st exposure suppressing member)

The 1 st exposure suppressing member 121 is a member for suppressing exposure of the end 14A of the 1 st filling portion 14 to the outside of the sheet as in embodiment 1, but the 1 st exposure suppressing member 121 shown in fig. 37 and 38 is a member for suppressing exposure of the end 14A of the 1 st filling portion 14 overflowing from the sheet 12. That is, as shown in fig. 37, the 1 st exposure suppressing member 121 functions as a covering member that covers the overflow end portion 14A of the 1 st filling portion 14. From the viewpoint of covering the end portion 14A, the 1 st exposure suppressing member 121 is sheet-shaped.

The 1 st exposure suppressing member 121 may be formed such that the entire 1 st exposure suppressing member 121 is exposed from the sheet 12, but may be partially covered with the sheet 12. By covering a part of the 1 st exposure suppressing member 121 with the sheet 12, the 1 st exposure suppressing member 121 is fixed, and therefore, positional displacement of the 1 st exposure suppressing member 121 can be suppressed.

Preferably, the size of the exposed portion 121A of the 1 st exposure suppressing member 121 exposed from the sheet 12 is larger than the size of the overflow end portion 14A of the 1 st filling portion 14. This allows the entire end portion 14A to be covered with the exposed portion 121A, and thus contamination of the sheet 12 can be further suppressed.

In order not to hinder the level difference alleviation by the 1 st filling portion 14, the non-exposed portion 121B of the 1 st exposure suppressing member 121 covered with the sheet 12 is preferably located in the non-effective region R2.

For the same reason as described in the column of the 1 st exposure suppressing member 18, the 1 st exposure suppressing member 121 is preferably arranged such that a part of the 1 st exposure suppressing member 121 is overlapped on the fixing member 17 as shown in fig. 35.

The length L6 (see fig. 38) of the exposed portion 121A in the circumferential direction DR4 of the winding core 11 is also determined by the length of the overflowed end portion 14A in the circumferential direction DR4 of the winding core 11, but is preferably, for example, 10mm or more. When the length L6 of the exposed portion 121A is 10mm 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 20mm or more, 50mm or more, or 100mm or more. The upper limit of the length L6 of the exposed portion 121A may be, for example, 1/2 or less of the length obtained by subtracting 10mm from the outer circumference (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 is also determined by the length of the overflowed end portion 14A in the width direction DR1 of the winding core 11, but is preferably 5mm or more, for example. If the width W6 of the exposed portion 121A is 5mm or more, the entire length of the overflowed 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 10mm or more, 30mm or more, or 50mm or more. The upper limit of the width W6 of the exposed portion 121A may be 40mm or less, 30mm or less, or 20mm or less from the viewpoint of suppressing the concern about contamination.

The thickness of the 1 st exposure suppressing member 121 is preferably 1 μm or more and 2000 μm or less. If the thickness of the 1 st exposure suppressing member 121 is 1 μm or more, deformation such as breakage or bending of the 1 st exposure suppressing member 121 can be suppressed, and the end portion 14A can be covered stably. In addition, if the 1 st exposure suppressing member 121 has a thickness of 2000 μm or less, the occurrence of a new step caused by the 1 st exposure suppressing member 121 can be suppressed even when the non-exposure portion 121B is provided as shown in fig. 38. The lower limit of the thickness of the 1 st exposure-inhibiting member 121 is more preferably 3 μm or more, 5 μm or more, or 10 μm or more, from the viewpoint that the 1 st exposure-inhibiting member 121 is not broken or deformed, and thus the end portion 14A can be covered more stably. The upper limit of the thickness of the 1 st exposure-inhibiting member 121 is more preferably 1000 μm or less, 500 μm or less, or 200 μm or less, from the viewpoint of further inhibiting the occurrence of a new step caused by the 1 st exposure-inhibiting member 121.

The constituent material of the 1 st exposure suppressing member 121 is not particularly limited as long as it is a sheet-like material and does not contaminate the sheet, and examples thereof include resins, metals, rubbers, gels, tapes (including buffer tapes), clays, and papers. With these materials, handling and/or setting is facilitated. Among them, the belt is preferable in terms of facilitating the operation and setting. In addition, when rubber or gel is used as the constituent material of the 1 st exposure suppressing member 121, the 1 st exposure suppressing member 121 itself can be deformed, and therefore, generation of a new step caused by the 1 st exposure suppressing member 121 can be suppressed.

< 2 nd exposure suppressing means >

The 2 nd exposure suppressing member 122 is a member for suppressing exposure of the end portion 16A of the 2 nd filling portion 16 to the outside of the sheet as in embodiment 1, but the 2 nd exposure suppressing member 122 shown in fig. 37 and 38 is a member for suppressing exposure of the end portion 16A of the 2 nd filling portion 16 overflowing from the sheet 12. That is, as shown in fig. 37, the 2 nd exposure suppressing member 122 functions as a covering member that covers the overflow end portion 16A of the 2 nd filling portion 16.

The 2 nd exposure suppressing member 122 may be entirely exposed from the sheet 12 for the same reason as described in the column 1 st exposure suppressing member 121, but may be partially covered with the sheet 12.

The size of the exposed portion 122A of the 2 nd exposure suppressing member 122 exposed from the sheet 12 is preferably larger than the size of the overflow end portion 16A of the 2 nd filling portion 16. Accordingly, the entire end portion 16A can be covered with the exposed portion 122A, and thus contamination of the sheet 12 can be further suppressed.

In order not to hinder the level difference alleviation by the 2 nd filling portion 16, the non-exposed portion 122B of the 2 nd exposure suppressing member 122 covered with the sheet 12 is preferably located in the non-effective region R2.

The 2 nd exposure suppressing member 122 is preferably sheet-shaped from the viewpoint of covering the entire end portion 16A.

For the same reason as described in the column of the 2 nd exposure suppressing member 19, the 2 nd exposure suppressing member 122 is preferably arranged so that a part of the 2 nd exposure suppressing member 122 is overlapped on the fixing member 17 as shown in fig. 35. The 1 st exposure suppressing member 121 and the 2 nd exposure suppressing member 122 shown in fig. 35 are separate, but the 1 st exposure suppressing member and the 2 nd exposure suppressing member may be integrated as in the exposure suppressing member 123 shown in fig. 39. In this case, the exposure suppressing member 123 has not only the 1 st exposure suppressing member but also the 2 nd exposure suppressing member.

The length L7 (see fig. 38) of the exposed portion 122A in the circumferential direction DR4 of the winding core 11 is also determined by the width of the overflowed end portion 16A in the circumferential direction DR4 of the winding core 11, but is preferably, for example, 10mm or more. When the length L7 of the exposed portion 122A is 10mm 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 20mm or more, 50mm or more, or 100mm or more. The upper limit of the length L7 of the exposed portion 122A may be, for example, 1/2 or less of the length obtained by subtracting 10mm from the outer circumference (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 is also determined by the length of the overflowed end portion 16A in the width direction DR1 of the winding core 11, but is preferably 5mm or more, for example. If the width W7 of the exposed portion 122A is 5mm or more, the entire length of the overflowed 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 10mm or more, 30mm or more, or 50mm or more. The upper limit of the width W7 of the exposed portion 122A may be 40m or less, 30mm or less, or 20mm or less from the viewpoint of suppressing the fear of contamination.

The thickness of the 2 nd exposure suppressing member 122 is the same as that of the 1 st exposure suppressing member 121, and therefore, the description thereof is omitted here.

The constituent material of the 2 nd exposure suppressing member 122 is the same as that of the 1 st exposure suppressing member 121, and therefore, the description thereof is omitted here.

Another roll body

The roll 120 is filled with the 2 nd filling portion 16 in the 2 nd gap 15, but as in the roll 130 shown in fig. 41, the 2 nd filling portion 16 may not be filled in the 2 nd gap 15, the 2 nd gap 15 becomes a hollow, and the 2 nd sandwiching portion 131 may be provided in at least the region 12D corresponding to the 2 nd gap 15 between the sheets 12 after 1 st week. In this case, it is preferable that an exposure suppressing member 132 (see fig. 40) is provided outside the end 131A of the 2 nd sandwiching portion 131 in the width direction DR1 of the winding core 11.

2 nd clamping part

The 2 nd sandwiching portion 131 is the same as the 2 nd sandwiching portion 111, and therefore, a description thereof is omitted here.

< exposure suppressing means >)

The exposure suppressing member 132 shown in fig. 40 is formed by integrating a 1 st exposure suppressing member that suppresses exposure of the end portion 14A of the 1 st filling portion 14 and a 2 nd exposure suppressing member that suppresses exposure of the end portion 131A of the 2 nd sandwiching portion 131. The 1 st portion 132A of the exposure control member 132 shown in fig. 42, which corresponds to the 1 st exposure control member, is the same as the 1 st exposure control member 121, and therefore, the description thereof is omitted here. The 2 nd portion 132B of the exposure control member 132 shown in fig. 42, which corresponds to the 2 nd exposure control member, is provided in the region 12D (see fig. 42) corresponding to at least the 2 nd gap 15 between the sheets 12 provided with the 2 nd sandwiching portion 131, and is provided outside the end portion 131A of the 2 nd sandwiching portion 131 in the width direction DR1 of the winding core 11, and is the same as the 2 nd exposure control member 122, and therefore, the description thereof will be omitted here. As shown in fig. 43, the side surface of the end 14A of the 1 st filling portion 14 or the side surface of the end 131A of the 2 nd sandwiching portion 131 is preferably covered with the exposure suppressing member 132.

Method for manufacturing roll

The roll 120 can be manufactured by the following method, for example. Fig. 44 and 45 are diagrams schematically showing a process of manufacturing a roll body according to the present embodiment. First, as shown in fig. 44 (a), the fixing member 17 is disposed on the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11.

After the fixing member 17 is disposed, the coating materials 201, 202 are applied to the outer peripheral surface 11A of the winding core 11 along the width direction DR1 of the winding core 11 as shown in fig. 44 (B) using a dispenser or the like. The coating materials 201, 202 are both applied to the outer peripheral surface 11A of the winding core 11 at positions corresponding to the effective regions R1 of the sheet 12. The coating material 201 is applied so as to contact the 1 st end face 17A of the fixing member 17, and the coating material 202 is applied so as to contact the 2 nd end face 17B of the fixing member 17. The coating material 201 may be applied so as to be close to the 1 st end face 17A of the fixing member 17, and the coating material 202 may be applied so as to be close to the 2 nd end face 17B of the fixing member 17.

After the coating materials 201, 202 are applied, 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 12A of the sheet 12 is adhered to the fixing member 17, and the winding start end 12A is fixed to the outer peripheral surface 11A of the winding core 11 via the fixing member 17.

After the winding start end portion 12A of the sheet 12 is fixed to the fixing member 17, the sheet 12 is wound along the outer peripheral surface 11A of the winding core 11 with a part of the 1 st exposure suppressing member 121 and a part of the 2 nd exposure suppressing member 122 interposed therebetween, as shown in fig. 45 (B). Specifically, the 1 st exposure suppressing member 121 is sandwiched between the winding core 11 and the 1 st sheet 12, and the 2 nd exposure suppressing member 122 is sandwiched between the 1 st sheet 12 and the 2 nd sheet 12, such that the 1 st exposure suppressing member 121 is positioned outside the coating material 202 in the width direction DR1 of the winding core 11 and the 2 nd exposure suppressing member 122 is positioned outside the coating material 201 in the width direction DR1 of the winding core 11. By sandwiching a part of the 1 st exposure suppressing member 121 and the 2 nd exposure suppressing member 122 in this manner, the 1 st exposure suppressing member 121 and the 2 nd exposure suppressing member 122 can be continuously sandwiched. Further, a part of the 1 st exposure suppressing member 121 and a part of the 2 nd exposure suppressing member 122 may be sandwiched between the winding core 11 and the 1 st sheet 12.

When the sheet 12 is wound, the coating materials 201 and 202 flow and spread, and therefore the coating material 202 fills the 1 st gap 13 and the coating material 201 fills the 2 nd gap 15, forming the 1 st filling portion 14 filled in the 1 st gap 13 and the 2 nd filling portion 16 filled in the 2 nd gap 15. Thereby, the roll 120 is obtained. In order to reliably expand and fill the coating material 202 and the like in the 1 st gap 13 and the like, it is preferable that the sheet 12 is wound by 1000m or more when the sheet 12 exceeds 1000m, and the entire length of the sheet 12 is wound when the sheet 12 is less than 1000 m.

In the case where the coating materials 201 and 202 are curable polymer compositions, the curable polymer compositions are cured after the sheet 12 is wound at least 2 weeks. In the case where the curable polymer composition is a one-component curable polymer composition (moisture-curable polymer composition), the composition is cured by reacting with humidity in the air and leaving it at room temperature, and therefore can be cured without using a special device such as a heating device or an ionizing radiation irradiation device. In addition, in the case where the curable polymer composition is a two-component curable polymer composition, the curable polymer composition can be cured by mixing the main agent and the curing agent.

In the case of manufacturing the roll 130 shown in fig. 41, first, after the sheet 12 is fixed to the fixing member 17, the coating material 201 is applied to at least the region corresponding to the 2 nd gap 15 in the effective region R1 of the sheet 12 along the width direction DR1 of the winding core 11, and the coating material 202 is applied so as to be in contact with the 2 nd end surface 17B of the fixing member 17. Then, the 1 st portion 132A of the exposure suppressing member 132 is sandwiched between the winding core 11 and the 1 st sheet 12, and a part of the 2 nd portion 132B of the exposure suppressing member 132 is sandwiched between the 1 st sheet 12 and the 2 nd sheet 12, so that the exposure suppressing member 132 is positioned outside the coating materials 201, 202 in the width direction DR1 of the winding core 11.

According to the present embodiment, since the 1 st filling portion 14 is filled in the 1 st gap 13, the step caused by the winding start end portion 12A of the sheet 12 can be relaxed for the same reason as in the 1 st embodiment.

According to the present embodiment, since the 2 nd filling portion 16 is filled in the 2 nd gap 15, the step caused by the fixing member 17 can be effectively alleviated for the same reason as in the 1 st embodiment.

According to the present embodiment, since the step caused by the winding start end portion 12A of the sheet 12 and the step caused by the fixing member 17 can be relaxed, the deformation of the sheet 12 can be suppressed. Thereby, sheet loss can be reduced.

According to the present embodiment, the end portion 14A of the 1 st filling portion 14 overflows to the outside of the sheet 12, but the overflowed end portion 14A is covered with the 1 st exposure suppressing member 121, so that the end portion 14A can be suppressed from being exposed to the outside of the sheet 12. This can suppress contamination of the sheet 12.

According to the present embodiment, the end portion 16A of the 2 nd filler 16 overflows to the outside of the sheet 12, but the overflowed end portion 14A is covered with the 2 nd exposure suppressing member 122, so that the end portion 16A can be suppressed from being exposed to the outside of the sheet 12. This can suppress contamination of the sheet 12.

According to the present embodiment, in the roll 130, the end 14A of the 1 st filling portion 14 overflows to the outside of the sheet 12, but the overflowed end 14A is covered with the exposure suppressing member 132, so that the end 14A can be suppressed from being exposed to the outside of the sheet 12. Further, since the exposure suppressing member 132 is disposed outside the 2 nd sandwiching portion 131 in the width direction DR1 of the winding core 11, the 2 nd sandwiching portion 131 can be suppressed from overflowing to the outside of the sheet 12, and the end 131A of the 2 nd sandwiching portion 131 can be suppressed from being exposed to the outside of the sheet 12. This can suppress contamination of the sheet 12.

Examples

The present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.

Example 1 >

First, a rectangular double-sided tape having a length of 1380mm, a width of 20mm, and a thickness of 10 μm as a fixing member was attached to an outer peripheral surface of a cylindrical core made of fiber reinforced plastic having an inner diameter of 153mm, an outer diameter of 167mm, and a width of 1600mm along a width direction of the core.

After the double-sided adhesive tape is attached, the winding core is held by the chuck member of the winding apparatus and fixed to the winding apparatus. Then, a linear 2 nd exposure suppressing member composed of a two-component curable silicone resin composition (product name "elatosil (registered trademark) M4503", manufactured by asahi Cheng Wake silicone corporation) was formed along the circumferential direction of the winding core in a region of the outer peripheral surface of the winding core corresponding to the non-effective region of the acrylic resin film. The 2 nd exposure suppressing member was formed so as to be spaced 15mm from the side edge in the width direction of the acrylic resin film. In the exposure suppressing member of the 2 nd embodiment, the length L4 in the circumferential direction of the winding core is 10mm, and the width W5 in the width direction of the winding core is 10mm. One end of the exposure suppressing member in the longitudinal direction is located on the double-sided tape, and the other end protrudes in the winding direction of the acrylic resin film more than the double-sided tape. The 2 nd exposure suppressing member is white in color. The length L4 and the width W5 refer to portions shown in fig. 7.

After the formation of the 2 nd exposure suppressing member, the position of the outer peripheral surface of the winding core located between the 2 nd exposure suppressing members and corresponding to a region of the acrylic resin film as a sheet material described later, which is an effective region, was set at 25 ℃ so as to be in contact with the 1 st end surface of the double-sided tape extending in the width direction of the winding coreA two-component curable silicone resin composition (product name: ELASTOSIL (registered trademark) M4503, manufactured by Asahi Kabushiki Kaisha Cheng Wake silicone Co., ltd.) was applied under ambient conditions. The silicone resin composition is white in color. In addition, the shear viscosity of the silicone resin composition at the time of application was 40 Pa.s, and the silicone resin composition was applied in an amount of 1cm per unit width along the width direction of the winding core ³ The mode of/m is linear coating.

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

After the acrylic resin film is fixed to the outer peripheral surface of the winding core, a linear 1 st exposure suppressing member composed of a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Cheng Wake silicone Co., ltd.) is formed along the circumferential direction of the winding core from the region of the outer peripheral surface of the winding core corresponding to the non-effective region of the acrylic resin film at the 1 st week. The 1 st exposure suppressing member was formed at a position 15mm apart from the side edge in the width direction of the acrylic resin film. In the exposure control member 1, the length L3 in the circumferential direction of the winding core was 10mm, the width W4 in the width direction of the winding core was 10mm, and the thickness at the position where the end face of the acrylic resin film was in contact was 500 μm. The 1 st exposure suppressing member has one end in the longitudinal direction protruding from the distal end surface of the winding start end portion of the acrylic resin film in a direction opposite to the winding direction of the acrylic resin film, and the other end located on the winding start end portion. The 1 st exposure suppressing member is white in color. The length L3 and the width W4 refer to portions shown in fig. 7.

After the 1 st exposure suppressing member is formed, the exposure suppressing member is positioned at the 1 st exposure suppressing member A two-component curable silicone resin composition (product name "elatosil (registered trademark) M4503", manufactured by asahi Cheng Wake silicone corporation) was applied to the outer peripheral surface of the winding core corresponding to the effective region of the acrylic resin film at a position in contact with the end surface of the winding start end portion and the 2 nd end surface of the double-sided tape opposite to the 1 st end surface at 25 ℃. The silicone resin composition is white in color. In addition, the shear viscosity of the silicone resin composition at the time of application was 40 Pa.s, and the silicone resin composition was applied in an amount of 1cm per unit width along the width direction of the winding core ³ The mode of/m is linear coating.

Then, the acrylic resin film was wound entirely around the winding core by the winding apparatus, the silicone resin composition was filled in the 1 st gap between the winding core and the 1 st acrylic resin film and in contact with the end face of the winding start end of the acrylic resin film, and the silicone resin composition was filled in the 2 nd gap between the winding core and the 1 st acrylic resin film and in contact with the 1 st end face of the double-sided tape. Thus, a roll was obtained. In the roll body, the silicone resin composition was cured to form a 1 st filling portion having a length of 20mm and a width of 1300mm and a maximum thickness of 300 μm, which was filled in the 1 st gap, and a 2 nd filling portion having a length of 20mm and a width of 1300mm and a maximum thickness of 300 μm, which was filled in the 2 nd gap.

The shear viscosity of the silicone resin composition was measured by using a dynamic viscoelasticity measuring device manufactured by Anton-Paar Japan corporation. Specifically, the shear viscosity of the silicone resin composition was determined as follows: the shear viscosity at a shear rate of 1[1/s ] was measured at 25℃using parallel plates of 25mm diameter. The shear viscosity of the silicone resin composition was determined as follows: the shear viscosity of the silicone resin composition was measured 10 times, and the arithmetic average of 8 shear viscosities, from which the maximum value and the minimum value were removed, was obtained from the 10 viscosities measured. The shear viscosity of the coating material used in the other examples below was 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 apparatus (product name: RETS-100, manufactured by Otsuka electronics Co., ltd.). Specifically, first, in order to stabilize the RETS-100 light source, the light source is left to stand for 60 minutes or longer after being lighted. Then, a rotation analyzer method is selected, and a θ mode (angular direction phase difference measurement mode) is selected. By selecting this θ mode, the table becomes a tilt rotation table.

Next, the following measurement conditions were inputted to RETS-100.

(measurement conditions)

Delay measurement range: rotary analyzer method

Measuring the diameter of the spot: phi 5mm

Tilt angle range: -40 DEG

Measurement wavelength range: 400nm to 800nm

Average refractive index of sample: 1.5

Thickness: 80 μm

Then, no sample was set in the apparatus, and background data was obtained. The device is designed as a closed system which is implemented every time the light source is illuminated.

The sample is then placed on a stage within the device. The sample size was 50mm by 50mm. However, the sample was cut out from a portion separated by 35mm or more from each end of the sheet toward the inside of the sheet.

After setting the sample, the table was rotated 360 ° on the XY plane at a temperature of 23 ℃ and a relative humidity of 50%, and the fast axis and the slow axis were measured. After the measurement is completed, the slow axis is selected. Then, measurement was performed while tilting the optical disk around the slow axis in the angle range set in the table, and data (Re) of the set tilt angle range and the set wavelength range were obtained in units of 10 °. The in-plane phase difference Re was measured at 5 points at different positions. Specifically, as shown in fig. 10, measurements were performed at 5 points in total of the center A1 and the points A2 to A4 of the sample. Then, the arithmetic average of 3 points excluding the maximum value and the minimum value among the measured values of 5 points is taken as the in-plane phase difference Re.

Example 2 >

In example 2, a roll was obtained in the same manner as in example 1, except that a 1 st exposure suppressing member composed of a cushion tape (product name: polyurethane foam tape 4032", manufactured by 3M Japan corporation) was used instead of a 1 st exposure suppressing member composed of a two-component curable silicone resin composition. The 1 st exposure suppressing member had a length L3 in the circumferential direction of the winding core of 45mm, a width W4 in the width direction of the winding core of 40mm, and a thickness of 800 μm at a position in contact with the end face of the acrylic resin film.

Example 3 >

In example 2, a roll was obtained in the same manner as in example 1, except that a 1 st exposure control member composed of a urethane resin composition (product name: "solvaine", manufactured by san francisco) was used instead of a 1 st exposure control member composed of a two-component curable silicone resin composition. The 1 st exposure suppressing member had a length L3 of 100mm in the circumferential direction of the winding core, a width W4 of 10mm in the width direction of the winding core, and a thickness of 1000 μm at a position in contact with the end face of the acrylic resin film.

Example 4 >

A roll was obtained in the same manner as in example 1, except that in example 4, a 1 st filling portion and a 2 nd filling portion were formed using a one-component curable silicone resin composition (product name: hapio Seal Pro HG ", manufactured by Campe Hapio) instead of the two-component curable silicone resin composition. The one-component curable silicone resin composition was gray, and the shear viscosity at the time of application of the one-component curable silicone resin composition was 180pa·s.

Example 5 >

In example 5, the coating amount per unit width was 0.3cm ³ A roll was obtained in the same manner as in example 1, except that the two-component curable silicone resin composition was applied to form the 1 st filled portion and the 2 nd filled portion.

Example 6 >

A roll was obtained in the same manner as in example 1, except that in example 6, a polyethylene terephthalate (PET) film (in-plane phase difference Re:2250 nm) having a length of 3400mm, a width of 1495mm and a thickness of 75 μm was used instead of the acrylic resin film. The PET film has a base layer on both sides.

Example 7 >

A roll was obtained in the same manner as in example 1, except that in example 7, a polyethylene terephthalate (PET) film (product name "CosmosinesRF (registered trademark)", toyo-yo Co., ltd., in-plane phase difference Re:8400 nm) having a length of 3400mm, a width of 1495mm and a thickness of 75 μm was used instead of the acrylic resin film. The PET film has a base layer on both sides.

Example 8 >

A roll was obtained in the same manner as in example 1, except that a cycloolefin polymer (COP) film (in-plane phase difference Re:99.7 nm) having a length of 3000m, a width of 1250mm and a thickness of 47 μm was used in place of the acrylic resin film in example 8. The COP film has no base layer.

Example 9 >

First, a rectangular double-sided tape having a length of 1380mm, a width of 20mm, and a thickness of 10 μm as a fixing member was adhered to the outer peripheral surface of a cylindrical core made of fiber-reinforced plastic having an inner diameter of 153mm, an outer diameter of 167mm, and a width of 1600mm along the width direction of the core.

After the double-sided tape is attached, the winding core is held by the chuck member of the winding apparatus and fixed to the winding apparatus. Then, a one-component curable silicone resin composition (product name "Hapio Seal Pro HG", manufactured by Campe Hapio, ltd.) was applied as a coating material in an environment of 25 ℃ so as to be in contact with the 1 st end face of the double-sided adhesive tape extending in the width direction of the winding core. The silicone resin composition was gray in color. In addition, the shear viscosity of the silicone resin composition at the time of coating was 180 Pa.s, and the silicone resin composition was coated in an amount of 1cm per unit width along the width direction of the winding core ³ The mode of/m is linear coating.

Then, a winding start end portion in the longitudinal direction of an acrylic resin film (in-plane phase difference Re:5 nm) having a length of 3000m, a width of 1340mm and a thickness of 80 μm as a sheet was attached to the double-sided tape along the width direction of the winding core, thereby fixing the acrylic resin film to the outer peripheral surface of the winding core.

After the acrylic resin film was fixed to the outer peripheral surface of the winding core, a one-component curable silicone resin composition (product name "Hapio Seal Pro HG", manufactured by Campe Hapio, inc.) was applied as a coating material to the region of the winding core corresponding to the effective region of the acrylic resin film so as to contact the end surface of the winding start end portion and the 2 nd end surface of the double-sided tape on the opposite side of the 1 st end surface at 25 ℃. The silicone resin composition was gray in color. In addition, the shear viscosity of the silicone resin composition at the time of coating was 180 Pa.s, and the silicone resin composition was coated in an amount of 1cm per unit width along the width direction of the winding core ³ The mode of/m is linear coating.

Then, the acrylic resin film was wound entirely around the winding core by the winding apparatus, the silicone resin composition was filled in the 1 st gap between the winding core and the 1 st acrylic resin film and in contact with the end face of the winding start end of the acrylic resin film, and the silicone resin composition was filled in the 2 nd gap between the winding core and the 1 st acrylic resin film and in contact with the 1 st end face of the double-sided tape.

In addition, when the acrylic resin film is wound, the 1 st exposure suppressing member, which is a single-sided adhesive tape (product name "Kokofusen L size", manufactured by Kanmido corporation), is partially sandwiched between the winding core and the non-effective region of the acrylic resin film and outside the silicone resin composition filled in the 1 st gap in the width direction of the acrylic resin film, and the 2 nd exposure suppressing member, which is a single-sided adhesive tape (product name "Kokofusen L size", manufactured by Kanmido corporation), is partially sandwiched between the non-effective regions of the acrylic resin film at 1 st and 2 nd weeks and at least the region corresponding to the 2 nd gap in the width direction of the acrylic resin film. Thus, a roll was obtained.

In the roll, the silicone resin composition was cured to form a 1 st filling portion having a length of 20mm and a width of 1340mm and a maximum thickness of 300 μm, which was filled in the 1 st gap, and a 2 nd filling portion having a length of 20mm and a width of 1340mm and a maximum thickness of 300 μm, which was filled in the 2 nd gap. The 1 st exposure suppressing member had a length L6 of 30mm in the circumferential direction of the winding core, a width W6 of 42mm in the width direction of the winding core, and a thickness of 25. Mu.m. The length L7 of the exposure suppressing member in the circumferential direction of the winding core was 30mm, the width W7 in the width direction of the winding core was 42mm, and the thickness was 25. Mu.m. The lengths L6 and L7 and the widths W6 and W7 refer to portions shown in fig. 38.

Example 10 >

In example 10, a roll was obtained in the same manner as in example 9, except that a double-sided adhesive tape (product name: double-sided adhesive tape VR-5000, manufactured by niton corporation) was used instead of the single-sided adhesive tape as the 1 st exposure suppressing member and the 2 nd exposure suppressing member.

Example 11 >

First, a rectangular double-sided tape having a length of 1380mm, a width of 20mm and a thickness of 10 μm as a fixing member was attached to the outer peripheral surface of a cylindrical core made of fiber reinforced plastic having an inner diameter of 153mm, an outer diameter of 167mm and a width of 1600mm along the width direction of the core.

After the double-sided tape is attached, the winding core is held by the chuck member of the winding apparatus and fixed to the winding apparatus. Then, a winding start end portion in the longitudinal direction of an acrylic resin film (in-plane phase difference Re:5 nm) having a length of 3000m, a width of 1340mm and a thickness of 80 μm as a sheet was attached to the double-sided tape along the width direction of the winding core, thereby fixing the acrylic resin film to the outer peripheral surface of the winding core. The acrylic resin film has: an effective area of 1270mm width; and a pair of non-effective regions having a width of 35mm located on both sides of the effective region in the width direction of the acrylic resin film.

After the acrylic resin film is fixed to the outer peripheral surface of the winding core, a linear exposure control member composed of a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Cheng Wake silicone Co., ltd.) is formed along the circumferential direction of the winding core from the region of the outer peripheral surface of the winding core corresponding to the non-effective region of the acrylic resin film at the 1 st week. The exposure suppressing member is formed by integrating a 1 st exposure suppressing member and a 2 nd exposure suppressing member, and has a 1 st portion corresponding to the 1 st exposure suppressing member and a 2 nd portion corresponding to the 2 nd exposure suppressing member. The exposure suppressing member was formed at a position 15mm apart from the side edge in the width direction of the acrylic resin film. In the exposure suppressing member, the length in the circumferential direction of the winding core was 150mm, the width in the width direction of the winding core was 10mm, and the thickness at the position contacting the end face of the winding start end portion of the acrylic resin film was 500 μm. The exposure suppressing member is white in color.

Then, a two-component curable silicone resin composition (product name "elatosil (registered trademark) M4503", manufactured by asahi Cheng Wake silicone corporation) was applied as a coating material to the area of the winding core corresponding to the effective area of the acrylic resin film so as to contact the end surface of the winding start end portion and the 2 nd end surface of the double-sided tape on the opposite side of the 1 st end surface at 25 ℃. In addition, a two-component curable silicone resin composition (product name "ELASTOSIL (registered trademark) M4503", manufactured by Asahi Kabushiki Kaisha Cheng Wake silicone Co., ltd.) was applied as a coating material to the effective region of the acrylic resin film, and the region was located between the winding core and the acrylic resin film at the 1 st week and corresponding to the 2 nd gap contacting the 1 st end face of the double-sided tape. The silicone resin compositions are white in color. In addition, the shear viscosity at the time of application of these silicone resin compositions was 40 Pa.s, and the amount of application of these silicone resin compositions per unit width was 1cm along the width direction of the winding core ³ The mode of/m is linear coating.

Then, the acrylic resin film was wound around the winding core entirely by the winding device, the 1 st gap between the winding core and the 1 st circumference acrylic resin film and in contact with the end face of the winding start end of the acrylic resin film was filled with the silicone resin composition, and the region between the 1 st and 2 nd circumference acrylic resin films and corresponding to the 2 nd gap was filled with the silicone resin composition.

In the roll, the silicone resin composition was cured to form a 1 st filling portion having a length of 20mm, a width of 1340mm and a maximum thickness of 300 μm, which was filled in the 1 st gap, and a 2 nd sandwiching portion having a length of 20mm, a width of 1340mm and a maximum thickness of 200 μm, which was located between the 1 st and 2 nd acrylic resin films and was interposed in the region corresponding to the 2 nd gap.

Comparative example 1 >

In comparative example 1, a roll was obtained in the same manner as in example 1, except that the 1 st filling portion and the 2 nd filling portion were not formed.

Comparative example 2 >

In comparative example 2, a roll was obtained in the same manner as in example 1, except that the 1 st exposure-inhibiting member and the 2 nd exposure-inhibiting member were not formed.

< measurement of deformation Mitigation Length >)

In the rolls of examples and comparative examples, the length at which the step caused by the winding start end of the film and the step caused by the double-sided tape were relaxed were measured, respectively. Specifically, since the step decreases from the winding start end toward the winding end, the film is first fed while measuring the feeding length (m) until the step is visually checked. Then, the film was cut at a place where the step was visually confirmed. In a state where a polyvinyl alcohol film is attached to the cut portion of the film, the film is visually observed by using reflected light in a state where a white LED lamp is reflected in the film in an indoor environment of 800 to 2000 Lux. Then, the distance from the point where the step was not visible to the winding start end was measured and used as the deformation alleviating length. Here, the outline of the white LED lamp reflected in the film is compared with other portions of the film, and the case where there is a deformed portion is determined as a step, and the portion where the outline of the white LED lamp reflected in the periphery of the step is identical to the other portions of the film is determined as no step. The white LED lamps are arranged such that the longitudinal direction of the white LED lamps is along the longitudinal direction of the film. The length of the white LED lamp is the length of the portion of the film across which the step is present and the portion without the step. In the observation, the line of the white LED lamp is clearly visible, and the white LED lamp is reflected in the film so that the outline thereof is visible. The visual observation was performed from all angles (180 ° to 180 °) with reference to the normal direction of the surface of the film (0 °).

< appearance evaluation >

In the roll bodies of examples and comparative examples, it was observed whether or not a part of the 1 st filling portion, the 2 nd filling portion, and the 2 nd sandwiching portion was exposed outside the film. The observer was 15 persons, and when all the observers considered that the 1 st filling portion and the 2 nd filling portion, or a part of the 2 nd sandwiching portion was not exposed, it was determined that the 1 st filling portion and the 2 nd filling portion, or the 2 nd sandwiching portion was not exposed. The evaluation criteria are as follows.

A: a part of the 1 st filling portion and the 2 nd filling portion or a part of the 1 st filling portion and the 2 nd sandwiching portion is not exposed.

B: a part of the 1 st filling portion and the 2 nd filling portion or a part of the 1 st filling portion and the 2 nd sandwiching portion is exposed.

< confirmation of the existence of the 1 st sandwiching portion >

In the wound body of examples 1, 4, and 5, it was confirmed whether or not the 1 st nip portion was present at the winding start end portion. Specifically, first, the acrylic resin film was fed from the roll until the surface became the acrylic resin film of the 2 nd week. Then, in the roll body having the acrylic resin film on the 2 nd week as the surface, the vicinity of the winding start end was visually observed, and whether or not a colored portion was present at the winding start end was observed. When the colored portion is present at the winding start end portion, the 1 st sandwiching portion is considered to be present, and when the colored portion is not present, the 1 st sandwiching portion is considered to be absent. The observer was 15 persons, and when all the observers considered that the colored portion was present at the winding start end, the 1 st interposed portion was judged to be present.

< measurement L1, L1+L2, T1, T2, S1, S1+S2 >)

In the roll bodies of examples 1, 4, and 5, when the presence of the 1 st nip portion was not confirmed, the length L1, the thicknesses T1, T2, and the area S1 were measured, and the length L1/the thickness T2, and the area S1/the thickness T2 were obtained. When the presence of the 1 st interposed portion is confirmed, the length l1+l2, the thicknesses T1 and T2, and the area s1+area S2 are measured, and (length l1+l2)/the thickness T2, (area s1+area S2)/the thickness T2 are obtained. The lengths L1 and L2, the thicknesses T1 and T2, and the areas S1 and S2 refer to portions shown in fig. 4 and 5.

Specifically, first, a jig for rotating the roll and a laser displacement meter (product name "LK-G30", manufactured by KEYENCE corporation) are prepared, and these are placed at predetermined positions, respectively. The jig is inserted into the widthwise hole of the winding core, thereby holding the winding body rotatably.

The laser displacement meter was located above the roll, and 3 laser beams were arranged so as to irradiate the surface of the roll. The arrangement positions of the laser displacement meters are as follows. First, the 1 st position and the 2 nd position, which equally divide the width 3 of the acrylic resin film, are determined. The 1 st position is located on the 1 st end side in the short side direction of the acrylic resin film, and the 2 nd position is located on the 2 nd end side on the opposite side to the 1 st position. The 1 st laser displacement meter is disposed so as to irradiate the laser beam at the midpoint between the 1 st position and the 1 st end, the 2 nd laser displacement meter is disposed so as to irradiate the laser beam at the midpoint between the 1 st position and the 2 nd position, and the 3 rd laser displacement meter is disposed so as to irradiate the laser beam at the midpoint between the 2 nd position and the 2 nd end.

Then, the roll is mounted on a jig, and the acrylic resin film is fed from the roll until the 1 st filling portion is exposed. Then, in a state where the 1 st filling portion was exposed, the displacement was continuously measured at a sampling period of 200 μs by a laser displacement meter while rotating the winding core at a rotational speed of 30mm/s in an environment where the temperature was 23 ℃ and the relative humidity was 50%, and a graph was obtained in which the horizontal axis was the position (mm) and the vertical axis was the displacement (mm). The measurement was performed from the distal end portion of the 1 st filling portion toward the position in contact with the distal end surface, and in the measurement, the reference height (a line with a displacement of 0 mm) was used as the height of the winding core, and the difference between the heights of the winding core and the 1 st filling portion was used as the thickness of the 1 st filling portion. The obtained graph is a graph showing a plane substantially including the longitudinal direction of the sheet and the radial direction of the winding core. In the graph, the 1 scale on the horizontal axis is 5mm, and the 1 scale on the vertical axis is 0.02mm.

In this graph, the position on the position shift curve where the displacement amount starts to decrease sharply is set as the position E1. When the presence of the 1 st sandwiching portion is not confirmed, the difference between the line having a displacement of 0mm and the displacement of the position E1 is obtained, whereby the thickness T2 of the 1 st filling portion at the position contacting the distal end surface is obtained.

In the case where the presence of the 1 st interposed portion was confirmed, the thickness T2 was measured by the following method. First, a sample having a size of 2cm×2cm including the winding start end 12A, the 1 st filling portion 14, and the 2 nd week sheet 12 was collected and fixed so that the portion was not crushed. Then, the cross section of the fixed sample was polished, and the thickness T2 of the 1 st filling portion was measured by a solid state microscope (product name: digital microscope VHX-7000, manufactured by KEYENCE) under the environment of a temperature of 23 ℃ and a relative humidity of 50%. In the measurement based on the thickness T2 of the solid microscope, the on-axis epi-illumination was selected as the illumination of the digital microscope, and performed under dark field and reflected light at 500 times magnification.

When the presence of the 1 st interposed portion is not confirmed, the length L1 is obtained from the graph of the displacement curve, similarly to the thickness T2. Specifically, first, the position E1 is set based on the graph, and the intersection between the line with the displacement amount of 0mm at the position where the displacement amount starts to rise and the position shift curve is set as the position E2. Then, a virtual line IL4 passing through the position E1 and perpendicular to the line having a displacement of 0mm is drawn. Then, the intersection of the virtual line IL4 and the line having a displacement of 0mm is set as a position E3, and the distance between the position E2 and the position E3 is obtained, thereby obtaining the length L1. The area S1 is calculated as follows: in the region from the position E2 to the position E3, the product of the thickness at each measurement point and the width between the measurement points is obtained and summed up. Based on the above expression (3), the width between measurement points was obtained from the sampling period, the rotational speed of the winding core, and the outer diameter of the winding core, and the result was 6.24 μm. When the presence of the 1 st sandwiching portion is confirmed, the length l1+l2 is obtained in the same manner as the length L1 when the presence of the 1 st sandwiching portion is not confirmed.

When the presence of the 1 st interposed portion is not confirmed, the length L1/thickness T2 and the area S1/thickness T2 are calculated using the calculated length L1, thickness T2 and area S1. When the presence of the 1 st sandwiching portion is confirmed, the (length l1+l2)/thickness T2, (area s1+area S2)/thickness T2 is obtained using the sum of the lengths L1 and L2, the thickness T2, and the sum of the areas S1 and S2.

The edge thickness T1 was measured using a scanning optical interferometry surface shape measuring instrument (product name "New View7300", manufactured by Zygo corporation). Specifically, first, when all the acrylic resin film is fed, the 1 st filling portion may adhere to the acrylic resin film side and may be peeled off from the winding core. Then, 1 or more samples having a size of 2mm×5mm including the 1 st filling portion were cut out from the acrylic resin film. The sample was cut out from any portion including the distal end portion of the 1 st filling portion, where dirt, fingerprint, and the like were not attached. Then, the edge thickness T1 of the 1 st filling portion was measured under the following measurement conditions. The edge thickness T1 is determined as follows: the edge thickness at 10 was measured, and the arithmetic average of the thicknesses at 8 out of the measured thicknesses at 10 was obtained after the maximum value and minimum value were removed.

(measurement conditions)

Objective lens: 10 times of

Zoom:1 time of

Measurement area: 2.17mm by 2.17mm

·scan Length：5μm

·min mod：0.015

Temperature: 23 DEG C

Relative humidity: 50 percent of

The results are shown in tables 1 and 2 below.

TABLE 1

TABLE 2

In the roll body of comparative example 1, the deformation relaxing length at the winding start end portion and the deformation relaxing length at the double-sided adhesive tape are both long. This is believed to be due to: the step difference due to the winding start end of the acrylic resin film is large because the 1 st gap is a hollow, and the step difference due to the double-sided tape is large because the 2 nd gap is a hollow. In contrast, in the roll bodies of examples 1 to 11, the deformation relaxing length at the winding start end portion and the deformation relaxing length at the double-sided tape were shorter than those of the roll body of comparative example 1. This is believed to be due to: in the roll bodies of examples 1 to 10, the 1 st filling portion was filled in the 1 st gap, so that the step difference due to the winding start end of the acrylic resin film was small, and the 2 nd filling portion was filled in the 2 nd gap, or the 2 nd sandwiching portion was sandwiched in the region corresponding to the 2 nd gap, so that the step difference due to the double-sided tape was small.

In the roll of comparative example 2, the end of the 1 st filling portion was exposed. This is believed to be due to: when the acrylic resin film is wound, pressure is applied to the silicone resin composition, and therefore, the silicone resin composition overflows to the outside of the acrylic resin film. In contrast, the roll bodies of examples 1 to 8 are provided with the 1 st exposure suppressing portion that suppresses the overflow of the 1 st filling portion itself and the 2 nd exposure suppressing member that suppresses the overflow of the 2 nd filling portion itself, and therefore the end portions of the 1 st filling portion and the end portions of the 2 nd filling portion are not exposed by overflowing from the film such as the acrylic resin film. Further, in the roll bodies of examples 9 and 10, since the 1 st exposure suppressing portion covering the overflow end portion of the 1 st filling portion and the 2 nd exposure suppressing member covering the overflow end portion of the 2 nd filling portion are provided, the end portions of the 1 st filling portion and the 2 nd filling portion are not exposed. In the roll body of example 11, since the 1 st portion covering the overflow end of the 1 st filling portion and the 2 nd portion suppressing the overflow itself of the 2 nd filling portion are provided, the end of the 1 st filling portion and the end of the 2 nd filling portion are not exposed.

The deformation alleviation length at the winding start end in the roll of example 6 is shorter than the deformation alleviation length at the winding start end in the roll of example 7. This is believed to be due to: the in-plane retardation of the PET film used in the roll of example 6 was smaller than that of the PET film used in the roll of example 7.

Since the length L1/thickness T2 or (length l1+length L2)/thickness T2 of the 1 st filling portion of the roll body of examples 1 and 4 is 90 or more and/or the area S1/thickness T2 or (area s1+area S2)/thickness T2 is 3.0 or more, the deformation alleviation length at the winding start end portion is shorter than that of the roll body of example 5 in which the length L1/thickness T2 is smaller than 90.

Description of the reference numerals

10. 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130: a roll body;

11: a winding core;

11A: an outer peripheral surface;

12: a sheet;

12A: a winding start end portion;

12A1: a distal end face;

13: 1 st gap;

14: a1 st filling part;

15: gap 2;

16: a 2 nd filling part;

17. 81: a fixing member;

18. 101, 121: 1 st exposure suppressing member;

19. 102, 122: the 2 nd exposure suppressing member;

111: a 2 nd clamping part;

112. 132: the suppressing member is exposed.

Claims (26)

1. A roll body comprising a roll core and an elongated sheet wound around the outer peripheral surface of the roll core,

the roll body is provided with:

a 1 st gap which is located between the winding core and the sheet of 1 st week and which is in contact with a distal end surface of a winding start end portion of the sheet of 1 st week in a longitudinal direction;

a 1 st filling portion that is filled in the 1 st gap and extends in the width direction of the winding core; and

and a 1 st exposure suppressing member that suppresses exposure of an end portion of the 1 st filling portion in the width direction to the outside of the sheet.

2. The roll of claim 1 wherein,

the 1 st exposure suppressing member is located outside the end portion of the 1 st filling portion in the width direction and is covered with the sheet.

3. The roll of claim 1 wherein,

the sheet has: an effective area; and an inactive area located outside the active area in the width direction, the 1 st exposure suppressing member being located in the inactive area of the sheet.

4. The roll of claim 2, wherein,

the 1 st exposure suppressing member extends in the circumferential direction of the winding core.

5. The roll of claim 2, wherein,

the length of the 1 st exposure suppressing member in the circumferential direction of the winding core is longer than the maximum length of the 1 st filling portion in the circumferential direction.

6. The roll of claim 1 wherein,

the end of the 1 st filling portion overflows to the outside of the sheet,

the 1 st exposure suppressing member is sheet-shaped and covers the end portion of the 1 st filling portion where the overflow occurs.

7. The roll of claim 1 wherein,

the 1 st filling part contains coloring material or luminescent material.

8. The roll of claim 1 wherein,

the 1 st filling part comprises a cured product of a curable polymer composition.

9. The roll of claim 1 wherein,

the 1 st exposure suppressing member is made of resin, or the 1 st exposure suppressing member is a belt.

10. A roll body comprising a roll core and an elongated sheet wound around the outer peripheral surface of the roll core,

the roll body is provided with:

a fixing member that is provided between the winding core and the sheet material of the 1 st circumference, has a 1 st end surface extending in the width direction of the winding core and a 2 nd end surface on the opposite side to the 1 st end surface, and fixes a part of the sheet material with respect to the winding core;

A 2 nd gap which is located between the winding core and the sheet material of the 1 st circumference and which is in contact with the 1 st end surface of the fixing member;

a 2 nd filling portion that is filled in the 2 nd gap and extends in the width direction of the winding core; and

and a 2 nd exposure suppressing member that suppresses exposure of an end portion of the 2 nd filling portion in the width direction to the outside of the sheet.

11. The roll of claim 10 wherein,

the 2 nd exposure suppressing member is located outside the end portion of the 2 nd filling portion in the width direction and is covered with the sheet.

12. The roll of claim 11 wherein,

the sheet has: an effective area; and an inactive area located outside the active area in the width direction, the 2 nd exposure suppressing member being located in the inactive area of the sheet.

13. The roll of claim 11 wherein,

the 2 nd exposure suppressing member extends in the circumferential direction of the winding core.

14. The roll of claim 11 wherein,

the length of the 2 nd exposure suppressing member in the circumferential direction of the winding core is longer than the maximum length of the 2 nd filling portion in the circumferential direction.

15. The roll of claim 10 wherein,

the end of the 2 nd filler overflows to the outside of the sheet,

the 2 nd exposure suppressing member is sheet-shaped and covers the end portion of the overflow of the 2 nd filling portion.

16. The roll of claim 10 wherein,

the 2 nd filling part contains coloring material or luminescent material.

17. The roll of claim 10 wherein,

the 2 nd filling part comprises a cured product of a curable polymer composition.

18. A roll body comprising a roll core and an elongated sheet wound around the outer peripheral surface of the roll core,

the roll body is provided with:

a fixing member that is provided between the winding core and the sheet material at the 1 st circumference, has a 1 st end surface extending in the width direction of the winding core, and a 2 nd end surface located on the opposite side of the 1 st end surface from the 1 st end surface and closer to the 1 st end surface than the 1 st end surface on the winding start end portion side in the longitudinal direction of the sheet material, and fixes a part of the sheet material to the winding core;

a 2 nd gap which is located between the winding core and the sheet material of the 1 st week and which is in contact with the 1 st end face of the fixing member;

A sandwiching portion provided in a region corresponding to at least the 2 nd gap between the sheets after the 1 st week and extending in the width direction of the winding core; and

and a 2 nd exposure suppressing member that suppresses exposure of an end portion of the sandwiching portion in the width direction to an outside of the sheet.

19. The roll of claim 18 wherein,

the 2 nd exposure suppressing member is located outside the end portion of the sandwiching portion in the width direction, and at least a part of the 2 nd exposure suppressing member is covered with the sheet.

20. The roll of claim 18 wherein,

the 2 nd exposure suppressing member extends in the circumferential direction of the winding core.

21. The roll of claim 18 wherein,

the length of the 2 nd exposure suppressing member in the circumferential direction of the winding core is longer than the maximum length of the sandwiching portion in the circumferential direction.

22. The roll of claim 18 wherein,

the sandwiching portion contains a coloring material or a light emitting material.

23. The roll of claim 18 wherein,

the sandwiching portion includes a cured product of a curable polymer composition.

24. The roll of claim 1, 10 or 18, wherein,

The sheet is a resin film, paper or glass film.

25. The roll of claim 1, 10 or 18, wherein,

the sheet contains an acrylic resin, a polyester resin, or a cycloolefin polymer resin.

26. The roll of 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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