JP2023177089A - winding roll - Google Patents

Abstract

To provide a winding roll formed in a roll shape by winding a long belt-like body having flexibility around a winding core, which can be suppressed from being deformed due to stress relaxation caused in the belt-like body.SOLUTION: A winding roll 100 is formed by winding a belt-like body 1, in a circumferential direction of a cylindrical winding core 2, around the winding core 2. An outer peripheral surface of the winding core 2 is provided with adhesion parts 3 for fixing a portion of an innermost first periphery part 11 facing an outer peripheral surface of the winding core 2 in the belt-like body 1 to the outer peripheral surface. The first periphery part 11 of the belt-like body 1 is fixed to the outer peripheral surface of the winding core 2 with the adhesion parts 3, at a portion 111 which starts riding on a starting end 10 which is first wound around the winding core 2 of the belt-like body 1.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a winding roll in which a long, flexible strip is wound around a core to form a roll.

Adhesive sheets are used, for example, to bond two different members together, and are widely used in various fields. In recent years, such adhesive sheets have also been used to manufacture display devices such as liquid crystal displays (LCDs) or input devices such as touch panels, and are used as adhesive sheets for bonding optical members that make up display devices and input devices. The use of sheets makes it possible to manufacture various devices with high precision and ease.

A pressure-sensitive adhesive sheet is a pressure-sensitive adhesive in the form of a sheet or film. During transportation and storage, adhesive sheets are flexible, made by applying a release agent to a film-like or sheet-like base material made of resin or paper on the two main surfaces of a long, thin strip-like adhesive sheet. It is in the form of a laminate in which strip-shaped release base materials are bonded together, and this laminate sheet is wound around a cylindrical winding core called a core to form a roll. Common.

As shown in FIG. 8, a portion of the laminate sheet 1 on the side of the starting end 10, which begins to be wound around the winding core 2, is fixed to the outer circumferential surface of the winding core 2 by an adhesive portion 3 such as double-sided tape. Then, by rotating the winding core 2 in the circumferential direction, the laminate sheet 1 is stacked on the winding core so that the first peripheral part 11, the second peripheral part 12, the third peripheral part 13, etc. overlap in this order from the inside. It is wound up in 2.

Here, in the laminate sheet 1, the first circumferential part 11, which is wound once around the outer peripheral surface of the winding core 2, rides on the starting end 10, so that the second circumferential part 12 overlaps the first circumferential part 11. Accordingly, a deformation D1 occurs in the first circumferential portion 11 due to a step difference depending on the thickness of the laminate sheet 1 and the thickness of the adhesive portion 3. This deformation D1 due to the step difference occurs each time the laminate sheet 1 is wound up several times, and the deformation D1 due to the step difference is formed in the laminate sheet 1.

In order to eliminate the occurrence of the deformation D1 due to the above-mentioned step difference, Patent Documents 1 and 2 disclose techniques in which an elastic resin foam layer is provided on the outer circumferential surface of the winding core 2.

JP2019-108211A Japanese Patent Application Publication No. 2013-199344

When the laminate sheet 1 is wound around the winding core 2, the outer flexible release base material 5 is elongated, and the inner flexible release base material 6 is compressed. Therefore, an elongated residual stress is generated in the outer flexible release base material 5 of the laminate sheet 1, and a compressive residual stress is generated in the inner flexible release base material 6. When the winding roll is left for a long time, such as when storing the winding roll, especially in a high temperature environment in the summer, the above-mentioned residual stress will be relaxed during that time, and the outer flexible release base material 5 will shrink. The inner flexible release substrate 6 stretches. As a result, as shown in FIG. 8(B), in the first circumferential portion 11 of the laminate sheet 1, the outer flexible release base material 5 shrinks and the adhesive sheet 4 is exposed on the starting end 10 side. An inner flexible release base material 6 that rides on the starting end 10 is stuck to the adhesive sheet 4 as a second peripheral portion 12. In addition, in the first peripheral portion 11 of the laminate sheet 1, the inner flexible release base material 6 is fixed to the outer peripheral surface of the winding core 2 by the adhesive portion 3 on the starting end 10 side of the laminate sheet 1. The elongation of the inner flexible release base material 6 proceeds along the outer peripheral surface of the winding core 2 in a direction opposite to the starting end 10. At this time, the inner flexible release base material 6 is stuck to the above-mentioned exposed adhesive sheet 4 on the starting end 10, and the elongation of the inner flexible release base material 6 is When the first circumferential part 11 rides on the starting end 10 as the second circumferential part 12 in front of the winding core 2, the first circumferential part 11 concentrates on the approximately triangular gap S formed between the outer circumferential surface of the winding core 2, The inner flexible release base material 6 is loosened at the position of the gap S. As the inner flexible release base material 6 loosens, a concave deformation D2 occurs in the adhesive sheet 4 and the outer flexible release base material 5, and the first circumferential portion 11 of the laminate sheet 1 The deformation D2 spreads outward, and a deformation D2 is formed in the laminate sheet 1 after the second peripheral portion 12 due to stress relaxation.

Although the techniques disclosed in Patent Documents 1 and 2 described above have the effect of suppressing the occurrence of deformation D1 due to the step, they do not have the effect of suppressing the occurrence of deformation D2 due to stress relaxation. If an elastic resin foam layer is provided, the effect of resisting the deformation caused by the winding core 2 will be lost, and will instead have a negative effect.

The present invention has been made in view of the above-mentioned problems, and uses a take-up roll in which a long and flexible strip is wound around a winding core to form a roll, which prevents deformation due to stress relaxation occurring in the strip. The purpose is to suppress.

As a result of extensive research to achieve the above object, the present inventors have discovered that when winding a long, flexible strip around a winding core, the innermost first circumference of the strip is The inventors have discovered that the above object can be achieved by fixing it to the outer circumferential surface of the winding core at this position, and have completed the present invention.

That is, in order to achieve the above object, the present invention includes the winding roll described in Item 1 below.

Item 1. A winding roll in which a flexible strip is wound around a cylindrical winding core in the circumferential direction of the winding core,
An adhesive part is provided on the outer peripheral surface of the winding core for fixing a part of the innermost first peripheral part of the band-shaped body facing the outer peripheral surface of the winding core to the outer peripheral surface,
The first circumferential portion of the strip is fixed to the outer circumferential surface of the winding core by the adhesive portion at a portion where the first circumferential portion of the strip begins to ride on the starting end of the strip where winding is started on the winding core. .

Further, the present invention includes, as a preferable embodiment of the take-up roll described in Item 1 above, the take-up roll described in Items 2 and 3 below.

Item 2. The adhesive portion extends along the circumferential direction of the outer peripheral surface of the winding core,
Item 2. The winding roll according to Item 1, wherein the starting end of the strip is fixed to the outer circumferential surface of the winding core by the adhesive portion.

Item 3. A plurality of adhesive portions are provided on the outer peripheral surface of the winding core at intervals in the circumferential direction,
Item 1, wherein a portion of the first circumferential portion of the band-shaped body that starts to ride on the starting end is fixed to the outer circumferential surface of the winding core by one of the plurality of bonded portions. winding roll.

Moreover, the present invention includes the winding rolls described in the following items 4 and 5 as preferred embodiments of the winding roll described in the above item 3.

Item 4. A portion of the strip near the starting end is fixed to the outer circumferential surface of the winding core by another one of the plurality of adhesive portions,
Item 4. The winding roll according to Item 3, wherein the adhesive portion is not interposed between the starting end of the strip and the outer circumferential surface of the winding core.

Item 5. 4. The winding roll according to item 3, wherein the starting end of the strip is fixed to the outer peripheral surface of the winding core by another one of the plurality of adhesive parts.

Further, the present invention includes the winding roll described in the following Item 6 as a preferable embodiment of the winding roll described in Items 1 to 5 above.

Item 6. The winding roll according to any one of Items 1 to 5, wherein the adhesive portion is a double-sided tape.

Further, the present invention includes the winding roll described in the following item 7 as a preferable embodiment of the winding roll described in items 1 to 6 above.

Section 7. The take-up roll according to any one of claims 1 to 6, wherein the adhesive portion has a thickness of 30 μm or less.

Further, the present invention includes the winding roll described in the following item 8 as a preferable embodiment of the winding roll described in items 1 to 7 above.

Section 8. 8. The winding roll according to any one of Items 1 to 7, wherein the strip has a laminated structure in which a flexible release base material is bonded to two main surfaces of an adhesive sheet.

According to the winding roll of the present invention, deformation due to stress relaxation can be suppressed from occurring in the strip wound into a roll around the winding core.

1 shows a schematic configuration of an example of a take-up roll according to an embodiment of the present invention. 2 shows a schematic configuration of another example of a take-up roll according to an embodiment of the present invention. 2 shows a schematic configuration of an example of a take-up roll according to another embodiment of the present invention. 2 shows a schematic configuration of another example of a take-up roll according to another embodiment of the present invention. 2 shows a schematic configuration of a state in which a strip is started to be wound around a winding core when manufacturing the winding roll shown in FIG. 1. FIG. A schematic cross-sectional configuration of a pressure-sensitive adhesive sheet is shown. 2 shows a schematic configuration of an example of a take-up roll according to another embodiment of the present invention. 1 shows a schematic configuration of a conventional take-up roll.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Take-Up Roll FIGS. 1 to 4 are schematic diagrams of a take-up roll 100 according to an embodiment of the invention. FIG. 5 is a schematic diagram of a state in which the strip 1 has started to be wound around the winding core 2 when manufacturing the winding roll 100 shown in FIG. 1. The take-up roll 100 of this embodiment is a roll-shaped product in which a long and flexible strip 1 is wound around a core 2 in the circumferential direction of the core 2. An adhesive portion 3 is interposed between the strip 1 and the outer peripheral surface of the winding core 2. In the band-shaped body 1 , a portion of the innermost first circumferential portion 11 facing the outer circumferential surface of the winding core 2 is fixed to the outer circumferential surface of the winding core 2 by a plurality of adhesive parts 3 .

Hereinafter, each structure of the winding roll 100 of this embodiment will be explained in more detail.

Band-shaped body The band- shaped body 1 has a single-layer structure of a long and thin strip-shaped sheet or film, or a laminate structure in which a plurality of the above-mentioned sheets and/or films are laminated. Sheets and films are made of flexible materials such as plastic and paper.

As shown in FIG. 5, the strip 1 has a long strip shape before being wound around the winding core 2, and the length is significantly larger in the width direction than in the width direction and perpendicular to the width direction. and has a long longitudinal direction. The strip 1 is wound around the outer peripheral surface of the winding core 2 in multiple layers along the longitudinal direction. The strip 1 has an end 10 on one side in the longitudinal direction and an end on the other side in the longitudinal direction (not shown). One end 10 of the strip 1 is the starting end at which winding around the winding core 2 begins. Hereinafter, one end 10 of the strip 1 will be referred to as a starting end 10.

As shown in FIGS. 1 to 4, the strip 1, when wound around the winding core 2, includes, from the inside, a first circumferential portion 11, a second circumferential portion 12, a third circumferential portion (not shown), It is a roll shape that overlaps in the order of... In the band-shaped body 1, the first circumferential portion 11 is a portion wound around the outer circumferential surface of the winding core 2, and the second circumferential portion 12 is a portion wound onto the first circumferential portion 11. The portions after the n-th circumferential portion (n is an integer of three or more) are wound onto the (n-1)th circumferential portion.

When the first circumferential portion 11 is wound once around the outer circumferential surface of the winding core 2, it rides on the starting end 10 of the band-shaped body 1, so that the second circumferential portion 12 overlaps on the first circumferential portion 11. Note that in the present disclosure, for convenience of explanation, the boundary between the first circumferential portion 11 and the second circumferential portion 12 directly above the starting end 10 of the strip-shaped body 1 is referred to as the terminal end 110 of the first circumferential portion 11; 1, the terminal end 110 of the first peripheral portion 11 is not clearly shown. Between the first circumferential portion 11 of the strip 1 and the outer circumferential surface of the winding core 2, the first circumferential portion 11 rides on the starting end 10 of the strip 1, and a second circumferential portion 12 is formed on the first circumferential portion 11. A gap S having a substantially triangular shape in cross section is created when the two overlap.

As shown in FIG. 6, a specific example of the strip 1 includes a sheet-like or film-like adhesive (hereinafter referred to as an "adhesive sheet") 4, and a pair of adhesive sheets attached to two main surfaces of the adhesive sheet 4. A laminate including flexible release base materials 5 and 6 can be exemplified. The adhesive sheet 4 is used, for example, to bond two different members together. The two members bonded together using the adhesive sheet 4 are not particularly limited, but may be used as optical members that constitute display devices and input devices when manufacturing display devices such as liquid crystal displays (LCDs) and input devices such as touch panels. An example of this is bonding them together. Further, the adhesive sheet 4 is used, for example, to protect the surface of a panel made of glass, plastic, or the like by being attached to the panel. Note that the use of the adhesive sheet 4 is not limited to the above-mentioned use.

The adhesive sheet 4 is formed, for example, by curing an adhesive composition. The pressure-sensitive adhesive composition is not particularly limited, and pressure-sensitive adhesive compositions that have been used in conventionally known pressure-sensitive adhesive sheets can be used. The method of forming the adhesive sheet 4 is not particularly limited, and for example, the adhesive composition is applied onto one flexible release base material to form a coating film of the adhesive composition, and the coating film is dried. By (curing), the adhesive sheet 4 can be formed. Another method for forming the adhesive sheet 4 is to apply the adhesive composition onto one flexible release base material to form a coating film of the adhesive composition, and then immediately apply the adhesive composition onto the other flexible release base material. The adhesive sheet 4 can also be formed by covering the coating film with a release base material and subjecting the coating film to ultraviolet treatment (curing) through the flexible release base material. The method of applying the adhesive composition onto one of the flexible release base materials is not particularly limited, and examples include a blade coater, an air knife coater, a roll coater, a bar coater, a gravure coater, a microgravure coater, a rod blade coater, A conventionally known coating method using a commercially available coating device such as a lip coater, die coater, curtain coater, etc. can be used.

The pair of flexible release base materials 5 and 6 have a property (flexibility) of being flexibly bent without breaking when wound around the winding core 2, and are, for example, sheets or films. The material of the pair of flexible release base materials 5 and 6 is not particularly limited, and the flexible release base materials 5 and 6 can be formed from conventionally known materials such as plastic and paper. Specific examples of the pair of flexible release base materials 5 and 6 include release paper made of polyethylene laminated on the surface of paper and coated with a release agent, and separator film made of polyester film coated with a release agent. can. The pair of flexible release base materials 5 and 6 may be made of the same material, or may be made of different materials.

Either one of the pair of flexible release base materials 5 and 6 may be used as a flexible non-release base material not coated with a release agent and may be a base material with an adhesive sheet. A functional layer such as a mechanical strength imparting layer or an optical adjustment layer may be provided on the back side of the surface to which the adhesive sheet is bonded to the flexible non-peelable base material, and a functional layer may be added to protect the functional layer. A protective base material that protects the surface provided with may be further laminated.

Winding Core As shown in FIGS. 1 to 4, the winding core 2 has a cylindrical shape with a predetermined outer diameter and a predetermined length, and has a longitudinal section (a central axis extending in the length direction of the winding core 2). In the cross section perpendicular to the cross section), the shape of the inner circumferential surface and the outer circumferential surface are circular with the same center O. The central axis of the winding core 2 is an imaginary line passing through the center O. The material of the winding core 2 is not particularly limited, and the winding core 2 can be formed of conventionally known materials such as plastic, paper, resin-containing paper, and metal.

Adhesive portion The adhesive portion 3 is used to fix a portion of the strip 1 to the outer circumferential surface of the winding core 2 . The adhesive part 3 is not particularly limited as long as it can tightly attach the belt-shaped body 1 and the outer peripheral surface of the winding core 2 and prevent them from coming apart easily. For example, it can be made of double-sided tape, adhesive, adhesive, etc. It can be configured using Among these, it is preferable to configure the adhesive portion 3 with double-sided tape from the viewpoint of improving workability (work time, work man-hours) and dimensional accuracy (width accuracy, thickness accuracy). The adhesive portion 3 is provided in advance on the outer circumferential surface of the winding core 2, for example. As shown in FIGS. 1 to 4, when the strip 1 is wound around the winding core 2, a portion of the innermost first peripheral portion 11 facing the outer peripheral surface of the winding core 2 has a plurality of adhesive portions 3. is fixed to the outer circumferential surface of the winding core 2.

As shown in FIG. 5, the adhesive portion 3 is formed between a pair of side edges 30 and 31 that face each other at an interval in the circumferential direction of the winding core 2, and a pair of ends that face each other at an interval in the longitudinal direction of the winding core 2. Edges 32 and 33 are provided. The length of the pair of side edges 30, 31 of the adhesive part 3 (the length of the adhesive part 3 along the width direction of the strip 1, hereinafter referred to as "width of the adhesive part 3") L1 is not particularly limited. However, it is preferably the same length as the length of the strip 1 in the width direction, or a length greater than the length of the strip 1 in the width direction. The length of the pair of edges 32 and 33 of the adhesive part 3 (a predetermined length along the circumferential direction of the winding core 2, hereinafter referred to as "the length of the adhesive part 3") L2 is the outer peripheral surface of the winding core 2 It is less than or equal to the circumference of

As shown in FIG. 1, the adhesive portion 3 has a predetermined thickness T. The thickness T of the adhesive part 3 is not particularly limited, but is preferably 30 μm or less, more preferably 15 μm or less. When the first circumferential portion 11 of the strip 1 is wound once around the outer peripheral surface of the winding core 2 and rides on the starting end 10 of the strip 1, a step is created according to the thickness of the strip 1 and the thickness T of the adhesive portion 3. However, since the thickness T of the bonded portion 3 is 30 μm or less, the above-mentioned step can be made small, and the deformation D1 caused in the strip 1 due to this step can be made small. Note that the thickness T of the adhesive portion 3 is not particularly limited, but is preferably 4 μm or more.

The adhesive parts 3 are not particularly limited, and as shown in FIGS. 1 to 4, a plurality of adhesive parts 3 are provided on the outer peripheral surface of the winding core 2, and a plurality of adhesive parts 3 are provided on the outer peripheral surface of the winding core 2 in the circumferential direction. They may be provided at intervals. In this case, along the circumferential direction, the outer circumferential surface of the winding core 2 includes a plurality of adhesive parts 3 that fix the adhesive sheet 1 to the outer circumferential surface, and a plurality of non-fixed parts that do not fix the adhesive sheet 1 to the outer circumferential surface. 20 exist alternately. When a plurality of adhesive parts 3 are provided on the outer circumferential surface of the winding core 2, although not particularly limited, in order to neatly wind the strip 1 on the winding core 2 while suppressing the occurrence of wrinkles, it is necessary to The length L2 of the portion 3 is preferably 5 mm or more and 100 mm or less, more preferably 10 mm or more and 50 mm or less, and most preferably 12 mm or more and 25 mm or less.

In the winding roll 100 shown in FIGS. 1 and 2, two adhesive parts 3 are provided on the outer peripheral surface of the winding core 2 at intervals in the circumferential direction; 3 and two non-fixed portions 20 are present alternately. In the winding roll 100 shown in FIG. 3, three adhesive parts 3 are provided on the outer peripheral surface of the winding core 2 at intervals in the circumferential direction. There are two non-fixed portions 20 alternately. In the winding roll 100 shown in FIG. 4, four adhesive parts 3 are provided on the outer peripheral surface of the winding core 2 at intervals in the circumferential direction. There are two non-fixed portions 20 alternately. Note that five or more adhesive portions 3 may be provided on the outer peripheral surface of the winding core 2 at intervals in the circumferential direction.

The presence of the non-fixed portion 20 on the outer circumferential surface of the winding core 2 allows the strip 1 to be neatly wound around the winding core 2 while suppressing the occurrence of wrinkles. Furthermore, since the non-fixed portion 20 occupies a wide range in the circumferential direction of the outer peripheral surface of the winding core 2, the adhesive sheet 1 can be wound around the winding core 2 more neatly.

Although not particularly limited, one of the plurality of adhesive parts 3 wraps a part of the starting end 10 side of the strip 1 and attaches it to the outer peripheral surface of the core 2, as shown in FIGS. 1 to 4. It is preferable to fix it to . This makes it easier to wind up the strip 1 around the winding core 2. The part of the strip 1 on the starting end 10 side may be a part including the starting end 10 (a part within a predetermined length range from the starting end 10), as shown in FIGS. 1, 3, and 4. As shown in FIG. 2, it may be a part close to the starting end 10 (a part within a predetermined length range from a position distant from the starting end 10 by, for example, 10 mm or more and 130 mm or less).

The starting end 10 of the strip 1 is not particularly limited, but as shown in FIG. It is preferable that it is not aligned with (the side edge 31 in FIG. 5). In other words, the starting end 10 of the strip 1 is not located on the adhesive part 3 but protrudes from the adhesive part 3 in the circumferential direction, and the adhesive part 3 is not interposed between it and the outer peripheral surface of the winding core 2. Preferably, it is not fixed to the outer peripheral surface of the winding core 2.

In the winding roll 100 shown in FIGS. 1, 3, and 4, when the first circumferential portion 11 of the strip 1 is wound around the outer peripheral surface of the winding core 2 and rides on the starting end 10 of the strip 1, the adhesive It is only necessary to step over the steps corresponding to the thickness T of the part 3 and the steps corresponding to the thickness of the strip-like body 1 one after another, and the steps according to the thickness of the strip-like body 1 and the thickness T of the adhesive part 3 are not overcome all at once. Therefore, in the winding roll 100 shown in FIGS. 1, 3, and 4, the deformation D1 caused in the strip 1 due to the above-mentioned step can be reduced compared to the conventional winding roll shown in FIG.

On the other hand, in the winding roll 100 shown in FIG. When the peripheral part 11 is wound around the outer peripheral surface of the winding core 2 and rides on the starting end 10 of the strip 1, there is a difference in level according to the thickness T of the adhesive part 3 and a thickness of the adhesive part 3 from the thickness of the belt 1. All you have to do is get over the level difference that corresponds to the thickness after subtracting T. Therefore, in the winding roll 100 shown in FIG. 2, the deformation D1 caused in the strip 1 due to the above-mentioned step can be further reduced. In addition, in the winding roll 100 shown in FIG. 2, the starting end 10 of the strip 1 is not fixed to the outer circumferential surface of the winding core 2, thereby making it possible to reduce the level difference formed on the strip 1.

In addition, also in the winding roll 100 shown in FIGS. 3 and 4, the position of the starting end 10 of the strip 1 with respect to the adhesive part 3 can be changed in the same way as in the winding roll 100 shown in FIG.

Another adhesive part 3 of the plurality of adhesive parts 3 is a part of the first circumferential part 11 of the strip-shaped body 1 that starts to ride on the starting end 10 (hereinafter, "the part of the first circumferential part 11 that starts to ride on"). ) 111 is fixed to the outer peripheral surface of the winding core 2. A portion 111 of the first circumferential portion 11 at which the first circumferential portion 11 starts to ride is a portion close to the terminal end 110 of the first circumferential portion 11 that has ridden on the starting end 10 of the strip-shaped body 1, and before the starting end 10, the first circumferential portion 11 is connected to the second circumferential portion 11. This is a portion separated from the outer circumferential surface of the winding core 2 in order to ride on the starting end 10 as the peripheral portion 12 .

When the strip 1 is wound around the winding core 2, the outer flexible release base material 5 is elongated, and the inner flexible release base material 6 is compressed. Therefore, an elongated residual stress is generated in the outer flexible release base material 5 of the strip 1, and a compressive residual stress is generated in the inner flexible release base material 6. When the take-up roll is left in place for a long time, such as during storage, especially in a high-temperature environment in summer, the above-mentioned residual stress will be relaxed, the outer flexible release base material 5 will shrink, and the inner flexible release base material 5 will shrink. The flexible release base material 6 stretches. As a result, in the first peripheral part 11 of the strip 1, the adhesive sheet 4 is exposed on the starting end 10 side by shrinking the outer flexible release base material 5, and the exposed adhesive sheet 4 is formed as a second peripheral part 12. The inner flexible release base material 6 riding on the starting end 10 sticks. In addition, in the first peripheral portion 11 of the laminate sheet 1, the inner flexible release base material 6 is fixed to the outer peripheral surface of the winding core 2 by the adhesive portion 3 on the starting end 10 side of the laminate sheet 1. The elongation of the inner flexible release base material 6 proceeds along the outer peripheral surface of the winding core 2 in a direction opposite to the starting end 10. Here, if the first circumferential portion 11 of the strip 1 is not fixed to the outer circumferential surface of the winding core 2 at a portion other than the part on the starting end 10 side of the strip 1, the inner flexible release base material 6 will be damaged. The elongation is caused by the approximately triangular shape formed between the first circumferential part 11 and the outer circumferential surface of the winding core 2 when the first circumferential part 11 rides on the starting end 10 as the second circumferential part 12 before the starting end 10 of the strip 1. Concentrate on the gap S. Therefore, as shown in FIG. 8, in the prior art, the inner flexible release base material 6 is greatly loosened at the position of the gap S, and with this slack, the adhesive sheet 4 and the outer flexible release base material are 5, a concave deformation D2 occurs. This deformation D2 of the first circumferential portion 11 of the band-shaped body 1 spreads outward, and a deformation D2 due to stress relaxation is formed in the band-shaped body 1 from the second circumferential portion 12 onward.

On the other hand, as shown in FIGS. 1 to 4, if the starting portion 111 of the first circumferential portion 11 of the strip 1 is fixed to the outer circumferential surface of the winding core 2 by the adhesive portion 3, the stress will be reduced. The elongation of the inner flexible release base material 6 caused by this is absorbed by the adhesive portion 3 and does not have much influence on the above-mentioned gap S portion. Therefore, since the inner flexible release base material 6 is effectively prevented from loosening at the position of the gap S, deformation D2 due to stress relaxation is prevented from occurring after the second peripheral portion 12 of the strip 1. Can be effectively suppressed. In addition, the adhesive part 3 is the initial part of the part 111 of the first circumferential part 11 of the strip-shaped body 1 at which it begins to run over, that is, the first circumferential part 11 of the strip-shaped body 1 is connected to the starting end 10 as the second circumferential part 12. If the portion that begins to separate from the outer circumferential surface of the winding core 2 in order to climb onto the winding core 2 is fixed to the outer circumferential surface of the winding core 2, it is possible to more effectively suppress the occurrence of deformation D2 in the strip 1 due to stress relaxation. .

The remaining adhesive parts 3 among the plurality of adhesive parts 3 are not particularly limited, but as shown in FIGS. , are preferably provided on the outer circumferential surface of the winding core 2 so that central angles θ1, θ2, . . . corresponding to the circumferential length of the winding core 2 are 180° or less. That is, each of the plurality of non-fixed portions 20 on the outer circumferential surface of the winding core 2 has a boundary E1 with one adjoining adhesive part 3 and a boundary E2 with another adjacent adhesive part 3 in a vertical cross-sectional view. It is preferable that the angle (∠E1OE2) formed by connecting the winding core 2 to the center O is 180° or less.

As a result, in the winding roll 100 shown in FIGS. 3 and 4, the first circumferential portion 11 of the strip 1 wound around the outer peripheral surface of the winding core 2 is moved in the circumferential direction of the winding core 2 by the plurality of adhesive parts 3. They are fixed to the outer peripheral surface of the winding core 2 with an interval of approximately 180° or less. The first circumferential portion 11 of the strip 1 is attached to the outer circumferential surface of the winding core 2 by the adhesive portion 3 not only at a portion of the strip 1 on the starting end 10 side and the starting portion 111 of the strip 1 but also at one or more other portions. If it is fixed, the elongation of the inner flexible release base material 6 due to stress relaxation will be absorbed by the adhesive portion 3 each time, and will not be concentrated in the above-mentioned gap S portion. Therefore, since the inner flexible release base material 6 is suppressed from loosening at the position of the gap S, deformation D2 due to stress relaxation occurs in the first circumferential portion 11 and the second circumferential portion 12 of the band-shaped body 1 and thereafter. can be suppressed.

In this way, the existence of a plurality of adhesive parts 3 on the outer peripheral surface of the winding core 2 at intervals of approximately 180° or less in the circumferential direction of the winding core 2 reduces stress on the strip 1 wound around the winding core 2. The occurrence of deformation D2 due to relaxation can be more effectively suppressed. Moreover, since there are many adhesive parts 3 in the circumferential direction of the outer circumferential surface of the winding core 2, it is possible to more effectively suppress the occurrence of deformation D2 in the strip 1 due to stress relaxation.

The central angles θ1, θ2, . There is no particular limitation as long as the angle is 180° or less, such as partially having different sizes.

Effects of the winding roll The winding roll 100 of the present embodiment described above is provided with an adhesive portion 3 on the outer circumferential surface of the winding core 2 for fixing a part of the first circumferential portion 11 of the adhesive sheet 1 to the outer circumferential surface. The first circumferential portion 11 of the strip 1 is fixed to the outer circumferential surface of the winding core 2 by the adhesive portion 3 at a portion 111 where it begins to ride on the starting end 10 of the strip 1. With this feature, as described above, the take-up roll 100 can reduce the compressive residual stress inherent in the flexible release base material 6 on the inside of the strip 1. Even if elongation occurs in the material 6 due to stress relaxation, this elongation is absorbed by the adhesive portion 3. Do not concentrate on the gap S in the shape. Therefore, since the inner flexible release base material 6 is suppressed from loosening at the position of the gap S, deformation D2 due to stress relaxation occurs in the first circumferential portion 11 and the second circumferential portion 12 of the band-shaped body 1 and thereafter. can be suppressed.

Further, the winding roll 100 of the present embodiment described above is characterized in that a plurality of adhesive parts 3 are provided on the outer peripheral surface of the winding core 2 at intervals in the circumferential direction of the winding core 2. I can do it. Due to this feature, the winding roll 100 has a plurality of bonded parts 3 and a plurality of non-fixed parts 20 on the outer circumferential surface of the winding core 2 along the circumferential direction, as described above. The presence of the non-fixed portion 20 on the outer circumferential surface of the winding core 2 allows the strip 1 to be neatly wound around the winding core 2 while suppressing the occurrence of wrinkles.

Further, in the winding roll 100 of the present embodiment described above, the starting end 10 of the strip 1 is fixed to the outer circumferential surface of the winding core 2 by one of the plurality of adhesive parts 3. can be characterized by Due to this feature, the winding roll 100 can easily wind the strip 1 around the winding core 2, as described above.

Further, in the winding roll 100 of the present embodiment described above, a portion of the strip 1 near the starting end 10 is fixed to the outer circumferential surface of the winding core 2 by one of the plurality of adhesives 3, and the strip is The winding core 2 may be characterized in that the starting end 10 of the winding core 2 is not fixed to the outer circumferential surface of the winding core 2 by the adhesive portion 3. Due to this feature, the winding roll 100 can easily wind the strip 1 around the winding core 2, as described above. Furthermore, when the first circumferential portion 11 of the strip 1 is wound around the outer circumferential surface of the winding core 2 and rides on the starting end 10 of the strip 1, it is only necessary to overcome a step depending on the thickness of the strip 1. Therefore, the deformation D1 that occurs in the strip 1 due to the step can be reduced.

Winding roll of other embodiments Although one embodiment of the present invention has been described above, the embodiment described above is only one of various embodiments of the present invention, and the present invention is limited to the embodiment described above. Not done. The embodiments of the present invention can be modified in various ways without departing from the spirit of the present invention. Other embodiments of the present invention will be described below. The objects of the present invention can also be achieved with other embodiments described below.

For example, FIG. 7 is a schematic diagram of a take-up roll 100 according to another embodiment of the invention. In the winding roll 100 shown in FIG. 7, the adhesive portion 3 that fixes the starting portion 111 of the first circumferential portion 11 of the strip 1 to the outer circumferential surface of the winding core 2 is attached in the circumferential direction of the outer circumferential surface of the winding core 2. The starting end 10 of the strip 1 is also fixed to the outer peripheral surface of the winding core 2. At the starting end 10 of the strip 1, one end (the side edge 31 in FIG. 5) of the adhesive part 3 protrudes from the strip 1 in the circumferential direction, and the starting end 10 of the strip 1 extends from both ends of the adhesive part 3. It is fixed to the outer circumferential surface of the winding core 2 by an adhesive portion 3 between the side edges 30 and 31 in FIG. 5 .

In the winding roll 100 shown in FIG. 7, similarly to the embodiment described above, it is possible to easily wind the strip 1 around the winding core 2, and it is also possible to effectively prevent deformation D2 occurring in the strip 1 due to stress relaxation. can be suppressed to

Furthermore, in the winding roll 100 shown in FIG. When it is wrapped once around the outer circumferential surface of and rides on the starting end 10 of the strip 1, it is sufficient to sequentially overcome a step corresponding to the thickness T of the adhesive portion 3 and a step corresponding only to the thickness of the strip 1, Do not go over the step depending on the thickness of the strip 1 and the thickness T of the adhesive part 3 all at once. Therefore, in the winding roll 100 shown in FIG. 7, the deformation D1 caused in the strip 1 due to the above-mentioned step can be reduced compared to the conventional winding roll shown in FIG.

Note that in the winding roll 100 shown in FIGS. 3 and 4 as well, similarly to the winding roll 100 shown in FIG. The adhesive part 3 to be fixed to the winding core 2 is extended along the circumferential direction of the outer peripheral surface of the winding core 2, and the starting end 10 of the belt-like body 1 is also fixed to the outer peripheral face of the winding core 2 (the first peripheral part 11 of the belt-like body 1 The adhesive part 3 that fixes the starting part 111 of the strip to the outer circumferential surface of the winding core 2 and the adhesive part 3 that fixes the starting end 10 of the strip 1 to the outer circumferential surface of the winding core 2 are integrated. be able to.

Further, in the winding roll 100 of all the embodiments described above, the strip 1 has a laminated structure including the adhesive sheet 4, but as the winding roll of other embodiments, the strip 1 has the adhesive sheet 4. It may be a single-layer structure or a plurality of laminated structures. Even if the strip 1 is not equipped with the adhesive sheet 4, if the strip 1 is wound around the core 2 under tension, the inner flexible release base material 6 will be loosened due to stress relaxation. The elongation is caused by the approximately triangular shape formed between the first circumferential part 11 and the outer circumferential surface of the winding core 2 when the first circumferential part 11 rides on the starting end 10 as the second circumferential part 12 before the starting end 10 of the strip 1. A considerable amount of it is concentrated in the gap S. Therefore, even if the strip 1 is not provided with the adhesive sheet 4, by applying the present invention, it is possible to suppress the occurrence of deformation D2 in the strip 1 due to stress relaxation.

Examples of the winding roll of the present invention will be shown below to specifically explain the functions and effects, but the winding roll of the present invention is not limited to the following examples.

In both Examples 1-3 and Comparative Example 1, the strip was made by laminating a 150 μm thick adhesive sheet on the release surface of a 100 μm thick PET-based flexible release base material. A laminate sheet was used in which another flexible release base material having a thickness of 75 μm and made of PET was laminated on the sheet so that its release surface was in contact with the adhesive sheet. The width of the strip is 1400 mm. This strip was wound around a 6-inch resin core with a width of 1450 mm using a winding device equipped with an automatic frame changer, changing the method of fixing the first peripheral portion of the strip to the outer peripheral surface of the core.

In Example 1, a double-sided tape with a thickness of 15 μm and a length L2 (shown in FIG. 5) of 24 mm is wound around the outer peripheral surface of a winding core in parallel to the central axis of the core, as in the winding roll shown in FIG. It was pasted over the entire length of the core, and the strip was wound around the core so that the starting end of the strip was located near the center of the double-sided tape in the length L2 direction.

In Example 2, like the take-up roll shown in FIG. 2, a first double-sided tape with a thickness of 15 μm and a length L2 (shown in FIG. 5) of 12 mm, and a second double-sided tape with a thickness of 35 μm and a length L2 of 20 mm are used. Apply two double-sided tapes to the outer circumferential surface of the core, with a distance of 20 mm from each other in the circumferential direction, parallel to the center axis of the core over the entire length of the core, so that the starting end of the strip is on the first double-sided tape. The strip was wound around the core in such a way that it protruded from the first double-sided tape in the circumferential direction of the core without being positioned.

Example 3 has a first double-sided tape with a thickness of 15 μm and a length L2 (shown in FIG. 5) of 12 mm, and a second double-sided tape with a thickness of 35 μm and a length L2 of 20 mm, like the take-up roll shown in FIG. Two double-sided tapes are pasted on the outer peripheral surface of the core, with a distance of 3 mm from each other in the circumferential direction, parallel to the center axis of the core over the entire length of the core, so that the starting end of the strip is on the first double-sided tape. The strip was positioned and aligned with the edge of the first double-sided tape and wound around the core.

In Comparative Example 1, like the conventional winding roll shown in Fig. 8, a double-sided tape with a thickness of 15 μm and a length L2 (shown in Fig. 5) of 12 mm was wound parallel to the central axis of the core over the entire length of the core. Then, the strip was wound around the core so that the starting end of the strip was positioned on the double-sided tape and aligned with the edge of the double-sided tape.

The respective winding rolls of Example 1-3 and Comparative Example 1 were left undisturbed for 4 days in a constant temperature room at 40°C, and the winding length from the start of winding, which was determined to be unusable due to transfer of deformation around the winding core, was compared. did.

In Example 1, the first circumferential portion of the strip was fixed to the outer circumferential surface of the winding core with double-sided tape at the portion that began to ride on the starting end of the strip. In Example 1, the first circumferential portion of the strip ran onto the double-sided tape with a thickness of 15 μm and then ran onto the starting end of the strip, and the deformation D1 due to the step was mainly proportional to the thickness of the strip of 325 μm. , deformation D2 due to stress relaxation did not occur. Therefore, the deformation transfer in Example 1 was suppressed to 14 m from the start of winding.

In Example 2, the first circumferential portion of the strip was fixed to the outer circumferential surface of the winding core with the second double-sided tape at the portion that began to ride on the starting end of the strip. In Example 2, the first peripheral portion of the strip runs on the second double-sided tape having a thickness of 35 μm and then rides on the starting end of the strip, but the deformation D1 due to the step when riding on the starting end of the strip is caused by the deformation D1 of the strip. The thickness is reduced to 290 μm, which is the thickness of 325 μm minus the thickness of the second double-sided tape, 35 μm.Furthermore, the starting end of the strip is not fixed to the outer peripheral surface of the winding core, so the step marks become thinner, and deformation D2 occurs due to stress relaxation. There was no. Therefore, the deformed transfer in Example 2 was suppressed to 12 m from the start of winding.

In Example 3, the first circumferential portion of the strip was fixed to the outer circumferential surface of the winding core with the second double-sided tape at the portion that began to ride on the starting end of the strip. In Example 3, the first peripheral part of the belt-shaped body rides on the second double-sided tape having a thickness of 35 μm and then rides on the starting end of the belt-shaped body, and the first peripheral part of the belt-shaped body rides on the starting end of the belt-shaped body. The deformation D1 mainly depends on the thickness of the strip, 325 μm (to be exact, 305 μm, which is the difference of 20 μm between the 15 μm thickness of the first double-sided tape and the 35 μm thickness of the second double-sided tape), and is due to stress relaxation. There was no occurrence of deformation D2. Therefore, the deformation transfer in Example 3 was suppressed to 14 m from the start of winding.

In Comparative Example 1, when the first peripheral part of the belt-shaped body runs over the starting end of the belt-shaped body, the double-sided tape also runs over the double-sided tape at once, so deformation D1 due to the step when the first peripheral part of the belt-shaped body runs over the starting end of the belt-shaped body The size corresponds to the thickness of the strip (325 μm) plus the thickness of the double-sided tape (15 μm), and deformation D2 due to stress relaxation occurred before and after the starting end of the strip. Therefore, the deformed transfer in Comparative Example 1 extended to 20 m from the beginning of winding.

From the above, it was confirmed that the winding roll of the present invention can suppress deformation of the strip wound around the winding core.

1 Adhesive sheet 2 Winding core 3 Adhesive part 10 Starting end of the adhesive sheet 11 First circumferential part of the adhesive sheet 111 Part that starts to ride on the starting end of the adhesive sheet

Claims (8)

A winding roll in which a flexible strip is wound around a cylindrical winding core in the circumferential direction of the winding core,
An adhesive part is provided on the outer peripheral surface of the winding core for fixing a part of the innermost first peripheral part of the band-shaped body facing the outer peripheral surface of the winding core to the outer peripheral surface,
The first circumferential portion of the strip is fixed to the outer circumferential surface of the winding core by the adhesive portion at a portion where the first circumferential portion of the strip begins to ride on the starting end of the strip where winding is started on the winding core. . The adhesive portion extends along the circumferential direction of the outer peripheral surface of the winding core,
The winding roll according to claim 1, wherein the starting end of the strip is fixed to the outer circumferential surface of the winding core by the adhesive portion. A plurality of adhesive portions are provided on the outer peripheral surface of the winding core at intervals in the circumferential direction,
2. The method according to claim 1, wherein a portion of the first circumferential portion of the band-shaped body that starts to ride on the starting end is fixed to an outer circumferential surface of the winding core by one of the plurality of bonded portions. Take-up roll as described. A portion of the strip near the starting end is fixed to the outer circumferential surface of the winding core by another one of the plurality of adhesive portions,
The winding roll according to claim 3, wherein the adhesive portion is not interposed between the starting end of the strip and the outer circumferential surface of the winding core. The winding roll according to claim 3, wherein the starting end of the strip is fixed to the outer peripheral surface of the winding core by another one of the plurality of adhesive parts. The take-up roll according to claim 1, wherein the adhesive portion is double-sided tape. The winding roll according to claim 1, wherein the thickness of the adhesive portion is 30 μm or less. The take-up roll according to any one of claims 1 to 7, wherein the strip has a laminated structure in which a flexible release base material is bonded to two main surfaces of an adhesive sheet.

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