KR20140027691A - Film sheet coiling roll and film sheet coiling method using the same - Google Patents

Abstract

Disclosed are a film sheet winding roll and a film sheet winding method using the same, wherein the film sheet winding roll and the film sheet winding method are to minimize the generation of marks due to a winding pressure on the end marks by attaching a film sheet, which has one end of which at least one side is diagonally cut, to the film sheet winding roll by the medium of an adhesive tape. A film sheet winding method according to the present invention comprises: a step (a) of preparing a film sheet winding roll having an outer core formed to surround an inner core and the outer circumferential surface thereof; a step (b) of arranging a film sheet, which has one end of which at least one side is diagonally cut, on the film sheet winding roll; a step (c) of bonding the film sheet to the film sheet winding roll by arranging an adhesive tape on a position corresponding to the film sheet winding roll and an apex protruding by diagonally cutting at least the one side of the one end of the film sheet; and a step (d) of winding the film sheet on the film sheet winding roll.

Description

Film sheet winding roll and film sheet winding method using same {FILM SHEET COILING ROLL AND FILM SHEET COILING METHOD USING THE SAME}

The present invention relates to a film sheet winding roll and a film sheet winding method using the same, and more particularly, a film sheet winding which can prevent the occurrence of pressing marks of the end mark due to the initial connection step of the film sheet. It relates to a roll and a film sheet winding method using the same.

In general, as for the method of attaching the film sheet to the surface of a flat object, a method of attaching the film using a roller, in particular, a heating and pressing roller, is widely known.

Such a film sheet is managed in a manner of winding in a roll form for convenience of transportation, storage, and the like prior to attaching the film sheet to a use method by using a heating and pressure roller. That is, the film sheet of a rectangular form is wound up along one direction to the film sheet winding roll.

However, conventionally, when completing the work of winding the film sheet on the film sheet winding roll, there is often a problem that press marks of end marks are generated due to the self-loading and winding pressure of the film sheet in the initial connection step portion of the film sheet. It was. As a result, the pressing marks of the end marks act as a detrimental factor of the film sheet.

Related prior arts are Korean Patent Registration No. 10-1017122 (2011.02.25.), Which discloses a curved film attaching device and a film attaching method using the same.

SUMMARY OF THE INVENTION An object of the present invention is to provide a film sheet winding roll which can prevent the occurrence of pressed marks of end marks due to the initial step difference of the film sheet.

Another object of the present invention is to provide a film sheet winding method that can minimize the occurrence of pressing marks in the initial connection step by winding the film sheet using the film sheet winding roll.

Film sheet winding roll according to an embodiment of the present invention for achieving the above object has an inner core having a pipe shape; And an outer core formed to surround the outer circumferential surface of the inner core, and at least one side of one end of the inner core being wound in an oblique direction.

Method for winding a film sheet according to an embodiment of the present invention for achieving the above object (a) providing a film sheet winding roll having an inner core and an outer core formed to surround the outer peripheral surface of the inner core; (b) disposing at least one side of the one end of the film sheet cut diagonally on the film sheet winding roll; (c) attaching an adhesive tape at a position corresponding to a vertex of which at least one side of the one end of the film sheet is cut in a diagonal direction and protrudes; And (d) winding the film sheet on the film sheet winding roll.

According to the present invention, the film sheet winding roll and the film sheet winding method using the same have a double layer structure having an inner core and an outer core formed on an outer circumferential surface of the inner core. By forming the material, it is possible to minimize the occurrence of pressing marks in the initial connection step portion of the film sheet wound on the outer peripheral surface of the outer core.

In addition, the film sheet winding roll and the film sheet winding method using the same according to an embodiment of the present invention by fixing the film sheet cut at least one side in an oblique direction at one side along the outer circumferential surface of the outer core by attaching one end with an adhesive tape By winding in the state, the surface cut in the oblique direction serves to disperse the winding pressure, thereby minimizing the occurrence of pressing marks in the initial connection step portion due to the self-load and the winding pressure of the film sheet.

1 is a perspective view showing a general film sheet winding roll.
It is sectional drawing which shows the general film sheet winding roll.
3 is a perspective view showing a film sheet winding roll according to an embodiment of the present invention.
4 is a cross-sectional view showing a film sheet winding roll according to an embodiment of the present invention.
5 is a perspective view showing a film sheet winding roll according to another embodiment of the present invention.
6 is a perspective view showing a film sheet winding roll according to another embodiment of the present invention.
7 is a process flowchart showing a film sheet winding method according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

1 is a perspective view illustrating a general film sheet winding roll, and FIG. 2 is a cross-sectional view illustrating a general film sheet winding roll.

1 and 2, in the case of a general film sheet winding roll 10, the film sheet 50 is wound along one direction on the outer circumferential surface of the film sheet winding roll 10.

In particular, the general film sheet 50 is attached to the short side (S1) of one end thereof, that is, the initial connection portion using the tape 60, and then wound the film sheet along the long side (S2) direction of the film sheet 50 The roll 50 is wound tens to hundreds of times.

However, when completing the work of winding the film sheet 50 on the film sheet winding roll 1, the self-load and the winding pressure of the film sheet 50 at the initial connection step portion F of the film sheet 50 As a result, a problem that an end mark is pressed is often caused. As a result, the pressing marks of the end marks act as a factor that impairs the value of the film sheet 50.

Hereinafter, a film sheet winding roll and a film sheet winding method using the same according to a preferred embodiment of the present invention with reference to the accompanying drawings to be described in detail.

3 is a perspective view showing a film sheet winding roll according to an embodiment of the present invention, Figure 4 is a cross-sectional view showing a film sheet winding roll according to an embodiment of the present invention. At this time, in Fig. 3 is shown together a film sheet wound on the film sheet winding roll.

3 and 4, the film sheet winding roll 100 according to the embodiment of the present invention shown includes an inner core 120 and an outer core 140.

The inner core 120 may have a pipe shape with a first diameter. The inner core 120 is a part constituting the body of the film sheet winding roll 100, it is preferably formed of a material having a certain strength. The inner core 120 may be made of paper, FRP (fiber reinforced plastic), PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride), ABS (acrylonitrile-butadiene-styrene), PS (polystyrene) ) May be used.

At this time, the thickness of the inner core 120 is preferably formed to 1 ~ 100mm. When the thickness of the inner core 120 is less than 1 mm, it may be difficult to secure a constant strength because the thickness is too thin. On the contrary, when the thickness of the inner core 120 exceeds 100mm, the effect of increasing the thickness is insignificant and thus it is not economical.

The outer core 140 may be formed to surround the outer circumferential surface of the inner core 120 and may have a second diameter larger than the first diameter. That is, the outer core 140 is attached along the outer circumferential surface of the inner core 120 to be bonded to the inner core 120.

The outer sheet 140 is wound around the film sheet 150 in which at least one side S1 of one end portion is cut in an oblique direction.

In particular, it is preferable that the outer core 140 is formed of a material having excellent shock absorption ability, which is a soft material compared to the forming material of the inner core 120, which is a winding pressure during winding by the film sheet 150. This is for minimizing the occurrence of a press mark on the end mark by effectively absorbing the press of the end mark. Specifically, the material of the outer core 140 is preferably selected from a PE foam (polyethylene foam), a PP foam (polypropylene form), a PE foam (polyurethane foam), latex foam (latex foam), etc. excellent in shock absorption. .

In addition, the outer core 140 preferably has a thickness of 0.2 ~ 10mm. If the thickness of the outer core 140 is less than 0.2 mm, the impact absorption effect is insignificant due to its thickness being too thin, and thus the suppression of the press marks generation of the end mark due to the initial connection step may be insufficient. On the contrary, when the thickness of the outer core 140 exceeds 10 mm, it is difficult to produce a uniform thickness on the outer circumferential surface of the inner core 120, and thus, irregular protrusions may be formed.

On the other hand, the film sheet 100 of the outer core 140 via the adhesive tape 160 is disposed at a position corresponding to the vertex (P) protruding by cutting at least one side (S1) of one side end portion in an oblique direction. It can be attached to the outer side. It is preferable to use a double-sided tape as the adhesive tape 160, which is to secure a predetermined or more adhesive force. At this time, the adhesive tape 160 made of a double-sided tape is disposed between the film sheet winding roll 100 and the film sheet 150, and serves to firmly attach the film sheet 150 to the film sheet winding roll 100. Done.

The adhesive tape 160 may have an area corresponding to the vertex P portion. In the case of the general film sheet winding roll 10 illustrated and described with reference to FIGS. 1 and 2, an adhesive tape (not shown) was attached along one end portion of the film sheet 50, that is, along the short side S1 direction.

On the contrary, in the case of the film sheet winding roll 100 according to the present invention, the outer core 140 may be formed by using the adhesive tape 160 having an area corresponding to only the vertex portion P of the film sheet 150. The film sheet is attached to the outer circumferential surface. In particular, in the present invention, since the film sheet 100 is made of an asymmetric structure, it is possible to secure sufficient adhesive force. As a result, the film sheet winding roll 100 according to the present invention can reduce the use amount of the adhesive tape 160 to about 1/5 or less as compared to a general film sheet winding roll, thereby improving the production yield. Can be.

In this case, the adhesive tape 160 may be selected from polyester, polyurethane, acrylic resin, EVA (ethylene co-vinyl acetate), PVAc (polyvinyl acetate), PVC (polyvinyl chloride), and the like.

As shown in FIG. 3, the film sheet 150 may have a trapezoidal shape in which one side S1 of one end thereof is cut in an oblique direction. In this case, it is preferable that the adhesive tape 150 is cut and attached to an area corresponding to the one vertex P of the film sheet 150 protruding by diagonal cutting.

Unlike this, the film sheet may be changed in design in various forms such as a pentagonal shape and a semicircle shape, which will be described below with reference to the accompanying drawings.

5 is a perspective view showing a film sheet winding roll according to another embodiment of the present invention, Figure 6 is a perspective view showing a film sheet winding roll according to another embodiment of the present invention.

First, as shown in FIG. 5, the film sheet 150 may have a pentagonal shape in which two opposite sides S1 of one end thereof are cut in diagonal directions. In this case, the adhesive tape 160 has vertices P protruding toward the central portion of one end of the film sheet 150 by cutting two opposite sides S1 in diagonal directions. At this time, it is preferable that the adhesive tape 160 is cut and attached to an area corresponding to the vertex portion P protruding to the center portion.

On the contrary, as shown in FIG. 6, the film sheet 150 may have a semicircular shape in which two opposite sides S1 of one end thereof are curved in a round shape. In addition, although not shown in the drawings, the shape of the film sheet 150 is not limited thereto, and the design changes to various forms such as 'V' and 'W'.

The film sheet winding roll according to the embodiment of the present invention described above has a double layer structure having an inner core and an outer core formed on an outer circumferential surface of the inner core, and the outer core is made of a soft material having excellent shock absorption. By forming, it is possible to minimize the occurrence of pressing marks in the initial connection step portion of the film sheet wound on the outer peripheral surface of the outer core.

In addition, the film sheet winding roll according to the embodiment of the present invention by winding the film sheet cut at least one side in the oblique direction at one side along the outer circumferential surface of the outer core in the state in which one end is attached and fixed with an adhesive tape, oblique direction The cut surface serves to disperse the winding pressure, thereby minimizing the occurrence of pressing marks in the initial connection step portion due to the winding pressure.

Hereinafter, a film sheet winding method using a film sheet winding roll according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

7 is a process flow chart showing a film sheet winding method according to an embodiment of the present invention, will be described in connection with FIG.

3 and 7, the film sheet winding method according to the embodiment of the present invention shown in the film sheet winding roll preparing step (S210), film sheet arrangement step (S220), adhesive tape attaching step (S230) and the film Sheet winding step (S240) is included.

Arrange film sheet winding roll

In the film sheet winding roll preparing step (S210), a film sheet winding roll 100 having an inner core 120 and an outer core 140 formed to surround the outer circumferential surface of the inner core 120 is provided.

At this time, the inner core 120 is a part constituting the body of the film sheet winding roll 100, it is preferably formed of a material having a certain strength. The inner core 120 may be made of paper, FRP (fiber reinforced plastic), PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride), ABS (acrylonitrile-butadiene-styrene), PS (polystyrene) ) May be used.

The thickness of the inner core 120 is preferably formed to 1 ~ 100mm. When the thickness of the inner core 120 is less than 1 mm, it may be difficult to secure a constant strength because the thickness is too thin. On the contrary, when the thickness of the inner core 120 exceeds 100mm, the effect of increasing the thickness is insignificant and thus it is not economical.

The outer core 140 is formed to surround the outer circumferential surface of the inner core 120, and is attached along the outer circumferential surface of the inner core 120 to be bonded to the inner core 120.

At this time, it is preferable that the outer core 140 is formed of a material having excellent shock absorption ability, which is a soft material compared to the forming material of the inner core 120, which is an end due to the winding pressure of the film sheet 150 to be described later. By effectively absorbing the pressing of the mark, it is to minimize the occurrence of the pressing mark of the end mark. Specifically, the material of the outer core 140 is preferably selected from a PE foam (polyethylene foam), a PP foam (polypropylene form), a PE foam (polyurethane foam), latex foam (latex foam), etc. excellent in shock absorption. .

In addition, the outer core 140 preferably has a thickness of 0.2 ~ 10mm. If the thickness of the outer core 140 is less than 0.2 mm, the impact absorption effect is insignificant due to its thickness being too thin, and thus the suppression of the press marks generation of the end mark due to the initial connection step may be insufficient. On the contrary, when the thickness of the outer core 140 exceeds 10 mm, it is difficult to produce a uniform thickness on the outer circumferential surface of the inner core, so that irregular protrusions may be formed.

Film sheet placement

In the film sheet arrangement step (S220), at least one side (S1) of one end portion is disposed on the film sheet winding roll 100 in a diagonal direction.

The film sheet 150 may be formed on the outer surface of the outer core 140 by an adhesive tape 160 disposed at a position corresponding to a vertex P at which at least one side S1 of one end thereof is cut in an oblique direction and protrudes. Can be attached.

Meanwhile, as shown in FIG. 3, the film sheet 150 may have a trapezoidal shape in which one side S1 of one end thereof is cut in an oblique direction. In this case, it is preferable that the adhesive tape 160 is cut and attached to an area corresponding to the one vertex portion protruding from the film sheet 150 by diagonal cutting.

On the contrary, as shown in FIG. 5, the film sheet 150 may have a pentagonal shape in which two opposite sides S1 of one end thereof are cut in diagonal directions. In this case, the adhesive tape 160 has vertices P protruding toward the central portion of one end of the film sheet 150 by cutting two opposite sides S1 in diagonal directions. At this time, it is preferable that the adhesive tape 160 is cut and attached to an area corresponding to the vertex portion P protruding to the center portion.

In addition, as shown in FIG. 6, the film sheet 150 may have a semicircular shape in which two sides S1 facing one end thereof are curved in a round shape.

With adhesive tape

Referring to FIGS. 3 and 7 again, in the adhesive tape attaching step (S230), at least one side S1 of one end of the film sheet winding roll 100 and the film sheet 150 is cut in an oblique direction to form a vertex ( The adhesive sheet 160 is disposed at a position corresponding to P) to attach the film sheet 150 to the film sheet winding roll 100. As a result, one end of the film sheet 150 may be attached to the outer peripheral surface of the outer core 140 via the adhesive tape 160.

In this case, the adhesive tape 160 may have an area corresponding to a portion of the vertex P protruding by cutting at least one side S1 of one end of the film sheet 150 in a diagonal direction.

In particular, in the present invention, it is preferable to attach the film sheet 150 to the outer circumferential surface of the outer core 140 using the adhesive tape 160 having an area corresponding to only the vertex portion of the film sheet 150. Since the film sheet 150 has an asymmetric structure, sufficient adhesive strength is secured even if only the portion corresponding to one end of the film sheet 150 is attached using the adhesive tape 160 having an area corresponding to the vertex portion P. Because it can be possible. As a result, the film sheet winding roll 100 according to the present invention can reduce the use amount of the adhesive tape 160 to about 1/5 or less as compared to a general film sheet winding roll, thereby improving the production yield. Can be.

In this case, the adhesive tape 160 may be selected from polyester, polyurethane, acrylic resin, EVA (ethylene co-vinyl acetate), PVAc (polyvinyl acetate), PVC (polyvinyl chloride), and the like.

Winding film sheet

In the film sheet winding step (S240), the film sheet 150 is wound on the film sheet winding roll 100.

At this time, the film sheet 150 is one direction, that is, the film sheet (1) by the rotational movement of the film sheet winding roll 100 in the state that one end thereof is attached to the outer peripheral surface of the outer core 140 via the adhesive tape 160 It is wound around the outer peripheral surface of the outer core 140 along the long side S2 direction of 150. Here, the rotational speed of the film sheet winding roll 100 is not particularly limited, but is preferably performed at a speed of 10 rpm or more in terms of productivity.

The film sheet winding method according to the embodiment of the present invention described above has a double layer structure having an inner core and an outer core formed on an outer circumferential surface of the inner core, and the outer core is made of a soft material having excellent shock absorption. By using a film sheet winding roll, generation | occurrence | production of the press marks in the initial stage connection part part of the film sheet wound up on the outer peripheral surface of an outer core can be minimized.

In addition, the film sheet winding method according to an embodiment of the present invention by winding the film sheet cut at least one side in an oblique direction at one side along the outer circumferential surface of the outer core in the state in which one end is attached and fixed with an adhesive tape, oblique direction The cut surface may serve to disperse the winding pressure, thereby minimizing the occurrence of pressing marks in the initial connection step portion due to the film sheet itself load and the winding pressure.

Example

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

1. Winding film sheet

Example 1

After attaching the film sheet which has a trapezoidal shape in which one side of one end part was cut | disconnected to the quadrilateral direction to the film sheet winding roll using the adhesive tape, the film sheet was wound up to the film sheet winding roll 10 times. Thereafter, after the coiled film sheet was uncoiled, it was visually determined whether an end mark pressing mark occurred at an initial connection step portion of the film sheet.

At this time, the inner core was used a paper material having a thickness of 50mm, the outer core was used a latex material having a thickness of 1mm, the adhesive tape was used a EVA (ethylene co-vinyl acetate) film of 20㎛ thickness.

Example 2

The film was wound on the film sheet winding roll in the same manner as in Example 1 except that a PP (polypropylene) material having a thickness of 20 mm was used as the inner core and a polyurethane material having a thickness of 0.5 mm was used as the outer core. The sheet was wound up.

Example 3

An acrylonitrile-butadiene-styrene (ABS) material having a thickness of 80 mm was used as the inner core, and a film was wound on the film sheet winding roll in the same manner as in Example 1 except that a latex material having a thickness of 2.5 mm was used as the outer core. The sheet was wound up.

Example 4

A film sheet was wound on a film sheet winding roll in the same manner as in Example 1 except that two sides of one end portion were used in a film sheet having a pentagonal shape cut in a quadrilateral direction.

Comparative Example 1

After attaching the film sheet which has a rectangular shape to the film sheet winding roll using the adhesive tape, the film sheet was wound 10 times on the film sheet winding roll. Thereafter, after the coiled film sheet was uncoiled, it was visually determined whether an end mark pressing mark occurred at an initial connection step portion of the film sheet.

In this case, the film sheet winding roll used a single core made of polyethylene (PE) material, and the adhesive tape used a polyester film having a thickness of 30 μm.

Comparative Example 2

A film sheet was wound on the film sheet winding roll in the same manner as in Example 1 except that a PE (polyethylene) material having a thickness of 150 mm was used as the inner core and a polyurethane material having a thickness of 6 mm was used as the outer core. Wound up.

2. Property evaluation

Table 1 shows the results of measuring the number of times the end mark pressed for the films wound by the method according to Examples 1 to 4 and Comparative Examples 1 to 2. At this time, the number of end mark pressing marks occurred after winding the film sheet ten times on the film sheet winding roll, uncoiling the wound film sheet, and then checking whether the end mark pressing marks occurred at the initial connection step portion of the film sheet. Whether it was visually discriminated and shown.

 [Table 1]

Referring to Table 1, it can be seen that in the case of films wound by the method according to Examples 1 to 4, the number of end mark pressing marks is significantly less when compared to the films wound by the method according to Comparative Examples 1 to 2. have.

In addition, as a result of the experiment, it was confirmed that the end mark pressing marks are clearly shown in the case of the films wound by the method according to Comparative Examples 1 and 2, whereas in the case of the film wound by the method according to Examples 1 to 4 It was confirmed that the pressing marks were clearly blurred.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. . Accordingly, the true scope of the present invention should be determined by the following claims.

100 film roll winding 120 inner core
140: outer core 150: film sheet
160: adhesive tape
S210: Film Sheet Roll Roll Preparation Step
S220: Film Sheet Placement Step
S230: Adhesive Tape Attaching Steps
S240: film sheet winding step

Claims (15)

An inner core having a pipe shape; And
And an outer core formed to surround an outer circumferential surface of the inner core, the outer core wound around at least one side of one end of the inner core in an oblique direction.
The method of claim 1,
The inner core is
A film sheet winding roll having a thickness of 1 to 100 mm.
The method of claim 1,
The outer core is
A film sheet winding roll having a thickness of 0.2 to 3 mm.
The method of claim 1,
The inner core is
It is formed of a material selected from paper, FRP (fiber reinforced plastic), PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride), ABS (acrylonitrile-butadiene-styrene) and PS (polystyrene) Film sheet winding roll.
The method of claim 1,
The outer core is
A film sheet winding roll, characterized in that formed of a material selected from one of a PE foam (poly ethylene foam), a PP foam (polypropylene form), a PE foam (polyurethane foam) and latex foam (latex foam).
The method of claim 1,
The film sheet is
At least one side of the one end is attached to the outer surface of the outer core via a pressure-sensitive adhesive tape disposed at a vertex which is cut in a diagonal direction and protrudes.
The method of claim 1,
The adhesive tape
And an area corresponding to the vertex portion.
8. The method of claim 7,
The adhesive tape
The film sheet winding roll, characterized in that formed of a material selected from polyester, polyurethane, acrylic resin, EVA (ethylene co-vinyl acetate), PVAc (polyvinyl acetate) and PVC (polyvinyl chloride).
The method of claim 1,
The film sheet is
One side of the one end portion has a trapezoidal shape cut in an oblique direction, the film sheet winding roll, characterized in that.
The method of claim 1,
The film sheet is
Film sheet winding rolls, characterized in that the opposite sides of the one end portion has a pentagonal shape cut in an oblique direction, respectively.
(a) providing a film sheet winding roll having an inner core and an outer core formed to surround an outer circumferential surface of the inner core;
(b) disposing at least one side of the one end of the film sheet cut diagonally on the film sheet winding roll;
(c) attaching the film sheet to the film sheet winding roll by disposing an adhesive tape at a position corresponding to a vertex protruding from the film sheet winding roll and at least one side of the one end of the film sheet in a diagonal direction. ; And
(d) winding the film sheet on the film sheet winding roll; film sheet winding method comprising a.
12. The method of claim 11,
In the step (a)
The inner core is a material selected from paper, fiber reinforced plastic (FRP), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), acrylonitrile-butadiene-styrene (ABS), and polystyrene (PS). Using the outer core is a film sheet winding method, characterized in that using a material selected from one of polyurethane (polyurethane) and latex (latax).
12. The method of claim 11,
In the step (b)
The film sheet is
One side of the one end portion has a trapezoidal shape cut in an oblique direction characterized in that the film sheet winding method.
12. The method of claim 11,
In the step (b)
The film sheet is
Film sheet winding method, characterized in that the opposite sides of the one end portion has a pentagonal shape cut each in an oblique direction.
12. The method of claim 11,
In the step (c)
The adhesive film is
The film sheet winding method, characterized in that it has an area corresponding to the vertex portion.

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