JP2000191994A - Packaged body of superimposed body of optical film with adhesive layer film lamination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a packaged body, which is free from trouble of peeling of a release film or protected from collapse of the shape of each of the superim posed optical films by fastening a superimposed body of a cube prepared by stocking film-laminated adhesive-attached optical films coated an adhesive for film lamination with a release film, with a belt-shaped narrow ring. SOLUTION: An optical film with an adhesive for film lamination having a structure in which a rectangular optical film has an adhesive layer on one side or both sides, and a release film is coated on the adhesive layer. Plural sheets of the optical film are piled to form a cube, that is, a film-lamination adhesive-coated optical film piled body 5. The piled body 5 is fastened all around with a belt-shaped strap ring 7 passing one side (AB) out of four sides (AB, BC, CD and DA) constituting the top face of the above piled body 5, and three sides (DC, HG and EF) which are parallel to the side AB, and having a width d1 smaller than the length of the side AB, and thus the objective packaged article 6 of the piled body 5 is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package of an optical film laminate with a film adhesive layer.

[0002]

2. Description of the Related Art Optical films (1) such as a linearly polarizing film, a retardation film, an elliptically polarizing film in which a linearly polarizing film and a retardation film are laminated, a circularly polarizing film, and the like are used for liquid crystal display devices. It is useful as one of the constituent optical components, and is used as a rectangular optical film having a shape conforming to the screen of a liquid crystal display device.

Conventionally, such an optical film (1) has been
Usually, in order to simplify the process of attaching to a liquid crystal display device, it is often shipped with an adhesive layer (2) provided on one or both surfaces thereof. Then, on the adhesive layer (2), a release film (3) for preventing foreign substances such as dust from adhering is adhered, and the optical film (4) with a film laminated adhesive layer is adhered. ) (FIG. 9). The release film is removed immediately before being attached to the liquid crystal display device, and is discarded.

The optical film (4) with a film laminated adhesive layer is a cubic optical film laminated body with a laminated film adhesive layer (5) on which the same size is laminated (FIG. 10). In order to prevent intrusion of dust and the like, the package (9) of the optical film superimposed body with the film laminate adhesive layer surrounded by the packaging material (10).
It can also be shipped as 1) (FIG. 11). As the packaging material (10), for example, a bag made of polyethylene or the like is cited, and after the optical film superimposed body (5) with the film laminating adhesive layer is put therein, the inside is dried and sealed by evacuating the inside. It is also possible to ship the product while keeping it.

However, the film laminated optical film superimposed body (5) in which a plurality of the film laminated adhesive layer-attached optical films are superimposed, the optical film laminated film-adhesive layer-attached optical film superimposed body (5) as it is when packaged with a packaging material as it is. There has been a problem that each of the optical films (4) with a film-laminated adhesive layer constituting the body is out of shape.

[0006] The shape collapse is caused by the superimposed body (5) on the release film (3) of the optical film (4) with a film laminated adhesive layer.
(31) exposed from the surface (FIG. 1).
2). The exposed portion (31) rubs against the packaging material (10) during transportation of the package (91), causing peeling of the release film (3), and thus, the adhesive layer (2) and the packaging material (10). ), Which makes it difficult to unpack the packaging material. For this reason, it is necessary to pay close attention when putting it in the packaging material, which is a problem in terms of workability.

[0007]

The inventors of the present invention have conducted intensive studies to develop an optical film laminate having a film laminate adhesive layer that hardly loses its shape. The present inventors have found that a package obtained by tightening the optical film superimposed body with the agent layer with a band-shaped string ring can be handled with almost no shape collapse, and the present invention has been achieved.

[0008]

That is, the present invention has a rectangular optical film (1) having an adhesive layer (2) on one or both sides thereof, and a release film (3) on the adhesive layer. A package of an optical film laminate with a film laminated adhesive layer (5) in which a plurality of optical films with a film laminated adhesive layer (4) are stacked to form a cube. 5) is one side (AB) of the four sides (AB, BC, CD, DA) constituting the upper surface and three sides (DC, HG, EF) parallel to the one side
Characterized by being tightened with a band-shaped string ring (7) having a width (d1) smaller than the length of one side of the optical film laminated body with the film laminated adhesive layer (6). Is provided. FIG. 1 shows an example of the package of the present invention.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an optical film (1) constituting an optical film with a film laminated adhesive layer applied to a package of the present invention, for example, a linear polarizing film, a retardation film, a linear polarizing film and a retardation film are used. An elliptically-polarized film or a circularly-polarized film laminated with a film is exemplified.

As the linearly polarizing film, a polarizing film made of polyvinyl alcohol (PVA) dyed with iodine or a dichroic dye and laminated on both sides with a film made of triacetyl cellulose (TAC) is usually used. used. The thickness of the polarizer film is usually 15 to
About 30 μm, TAC film thickness is usually 40 to 20
It is about 0 μm. The polarizer film and the TAC film are usually bonded with a polyvinyl alcohol-based adhesive or the like. As the retardation film, for example, a uniaxially oriented film obtained by stretching a polycarbonate resin film is used, and its thickness is usually 30 to 1
It is about 00 μm. Further, a film having a directionality such as a light control film having a property that incident light from a specific angle is scattered and incident light from other angles is transmitted as it is can be given. As such a light control film, "Lumisty" manufactured by Sumitomo Chemical Co., Ltd. is exemplified. Further, the optical film may be a laminated film of a light control film, a linear polarizing plate, and a retardation plate.
The shape of such an optical film is a rectangle having a size corresponding to the target screen size of the liquid crystal display device.

[0011] The optical film with a film laminated adhesive layer is
The rectangular optical film has an adhesive layer (2) on one or both sides (FIG. 9). The adhesive constituting the adhesive layer is not particularly limited as long as it is transparent and optically isotropic, and a pressure-sensitive adhesive (adhesive) is usually used. Usually, an acrylic pressure-sensitive adhesive, a urethane pressure-sensitive adhesive, or the like is used as the pressure-sensitive adhesive.
The thickness of the adhesive layer is generally about 10 μm to 50 μm.

An optical film with a film laminated adhesive layer is
A release film (3) is provided on the adhesive layer (FIG. 9). The release film is a film for preventing foreign matter from adhering to the adhesive layer, and is usually an adhesive for preventing foreign matter from being adhered before the optical film is incorporated into the liquid crystal display device. It is affixed on the layer and removed and discarded when incorporated in a liquid crystal display device. As the material of the release film, polyethylene, polyethylene terephthalate (PET) or the like is usually used, and its thickness is usually 20 to 40 μm. Such a release film may be provided with release properties by, for example, treating the surface with a silane coupling agent or the like.

The optical film (4) with the film laminated adhesive layer has the same rectangular shape and size as the optical film constituting it. By laminating a plurality of optical films with a film laminated adhesive layer, a cubic optical film laminated body with a film laminated adhesive layer (5) is formed (FIG. 10).

The optical film with a film-laminated adhesive layer is
The plurality of sheets may be simply superimposed, and if the respective sides are aligned and superimposed, the resulting optical film superimposed body (5) with a film laminated adhesive layer becomes a rectangular parallelepiped. The number of sheets to be superimposed is not particularly limited, but may be appropriately determined in consideration of the size, weight, etc. of each film-laminated adhesive layer-attached optical film (4) to such an extent that handling of the obtained superimposed body (5) is not difficult. It is selected, for example, about 20 to 500 sheets, and is superimposed so that the height (h) is usually about 3 to 20 cm.

The optical film superimposed body (5) with a film laminated adhesive layer has an upper surface (ABCD) and a lower surface (EFGH).
A protective sheet or the like may be disposed on the surface. The protection sheet is
It is a sheet disposed for the purpose of preventing the optical film with a film laminated adhesive layer from being damaged.

In the package (6) of the present invention, such an optical film superimposed body (5) with a film laminated adhesive layer comprises:
One side (AB) of the four sides (AB, BC, CD, DA) constituting the upper surface and three sides (DC, H
G, EF) and a width (d) smaller than the length of the one side.
It is tightened by using the belt-shaped string ring (7) of 1).

As the belt-like string ring (7), for example, a ring made of a polymer film can be used, and four parallel sides (AB, DC, H) of the belt-like polymer film can be used.
G, EF) and then gluing both ends to form a belt-like string ring. In order to tighten using a polymer film, both ends of the superimposed body (5) may be adhered to each other while the polymer film is kept in a tensioned state while pressure is applied to the superimposed body (5) from above and below. The bonding may be performed by a method using an adhesive or a method using heat fusion. It is necessary that the width (d1) of the band-shaped string ring is smaller than the length of the one side (AB), but it is preferably smaller than 2 cm, and the width of the band-shaped string ring (7) is 1 cm or more on both sides. It is preferable to have a portion that does not touch the string ring. The width (d
If 1) is equal to or larger than the one side (AB), it tends to be difficult to tighten. The thickness of the band-shaped string ring is usually about 50 to 150 μm.

It is preferable that the surface of the band-shaped string ring that comes into contact with the superposed body is subjected to a mold release treatment. Due to the release treatment, it is possible to prevent the adhesive from coming into contact with the end face of the adhesive layer (2) exposed on the end face of the superimposed body (5). It is preferable that the band-shaped string ring be easily torn in the width direction because the band-shaped string ring can be easily removed at the time of unpacking.

In the packing body (6) of the present invention, since the band-like string ring (7) having a small width is used, the whole of the superimposed body (5) is made of one packing material such as a polyethylene bag (10). The superimposed body (5) can be tightened more firmly as compared with the conventional method (FIG. 11) enclosing the superposed body. In addition, since the superimposed body (5) is tightened by the band-shaped cord ring (7), it hardly loses its shape due to the vibration during transportation. ) Is hardly exposed to the outside.

The width (d1) of the band-shaped string ring is smaller than the length of the one side (AB). Therefore, the two end faces (ABFE, DCGH) of the superimposed body (5) through which the band-shaped string ring passes.
Each of the sides (AE and BF, DH and CG) parallel to the band-shaped string ring (7) of the four sides constituting the band-shaped string ring (7)
It is exposed to the outside without contact.

In the packing method of the present invention, the optical film superimposed body (5) with the film-laminated adhesive layer thus tightened further comprises one of the four sides constituting the upper surface thereof.
A width (d2) passing through another side (BC) intersecting the side (AB) and three sides (AD, FG, EH) parallel to the other side, and smaller than the length of the other side (BC) ) May be tightened with another band-like string ring (8) (FIG. 2).

As the band-shaped string ring (8), the same as the above-described band-shaped string ring (7) can be used. The materials, widths (d1, d2), etc., of the two cord rings (7, 8) may be the same or different. In such a package, the optical film superimposed body (5) with the film laminate adhesive layer tightened by using the band-shaped string ring (7) is further tightened by using the band-shaped string ring (8) having a small width. Thus, the superimposed body (5) can be more firmly tightened, and the shape collapse can be further prevented.

The width (d2) of the band-shaped string ring is smaller than the length of the one side (BC). Therefore, the two end faces (ADHE, BCGF) of the superimposed body (5) through which the band-shaped string ring passes.
Each of the sides (AE and DH, BF and CG) parallel to the band-shaped string ring (8) of the four sides constituting the band-shaped string ring (8)
It is exposed to the outside without contact.

The package (6) of the present invention can also be a package (9) of an optical film superimposed body with a film laminate adhesive layer in a state of being entirely surrounded by a packaging material (10) (FIG. 3). ). Since the entire package is surrounded by the packaging material, it is also possible to prevent foreign substances from being mixed.

Examples of the packaging material (10) include polyethylene (PE) including linear low density polyethylene (LLDPE), polyolefins such as polypropylene (PP), nylon (NY), vinyl chloride, and polyethylene terephthalate (PET). And a bag made of a single-layer film or a bag made of a multi-layer film.
Tightened film laminated optical film superimposed body (5)
, The inside may be evacuated and sealed. When the packaging material is made of a material that can be heat-sealed, sealing can be performed by heat-sealing. Such packaging material (10)
If is transparent, the inside can be easily observed.

The package (9) has an upper surface (AB).
CD) and a lower surface (E) of the first film (10a).
The first film (10) may be a package that is surrounded by two packaging materials (FIG. 5) and a second film (10b) that covers the FGH).
The a) and the second film (10b) are heat-sealed (heat-sealed) to each other over the entire circumference (FIG. 6). If the heat-sealed portion (11) is used as an easy peel, the first film and the second film can be easily peeled off, and the package (6) in the package (9) can be easily taken out. You can also. One package (6) may be provided (FIGS. 5 and 6), or two or more packages may be arranged (FIGS. 7 and 8).

In such a package, for example, after the package (9) of the present invention is placed between the first film (10a) and the second film (10b), the two films (10a, 10a) are placed.
b) may be thermally fused over the entire circumference. The interior of the packaging material after heat fusion may be reduced in pressure to a vacuum, or may be replaced with an inert gas such as nitrogen.

The material of the first film (10a) and the second film (10b) is, for example, polyethylene (P) including linear low density polyethylene (LLDPE).
E), polyolefins such as polypropylene (PP),
Polyesters such as nylon (NY), vinyl chloride, and polyethylene terephthalate (PET) that can be thermally fused to each other can be used. Both films (10a, 10
b) may be a single-layer film or a multilayer film. A commercially available film can be used as such a film.

At least one of the first film (10a) and the second film (10b) may be formed in advance in accordance with the shape of the superimposed body (5). If the first film or the second film is formed in this manner, the package (6) can be easily placed and surrounded.

[0030]

According to the package of the present invention, each of the optical films (4) with a film adhesive layer constituting the optical film laminate (5) with a film adhesive layer loses its shape. Since it is difficult, a part of the release film (3) is not exposed and peeled off.

[0031]

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

Example 1 Linear polarizing film [a film obtained by laminating a TAC film (thickness: 75 μm) on both surfaces of a polarizer film (thickness: 25 μm) made of PVA dyed with iodine. A film laminated adhesive in which an acrylic pressure-sensitive adhesive layer (thickness: 25 μm) is provided on one side of the above-mentioned, and a release film (PET film, thickness: 40 μm) is adhered on the acrylic pressure-sensitive adhesive. Linear polarizing film with layer [Total thickness is 12
0 μm, the size is 20 cm × 18 cm] (4) are superimposed on each other, and an optical film laminate with a film laminated adhesive layer [size 20 cm × 18 cm, height (h) is 18 c
m] (5) was obtained (FIG. 10). The upper surface (ABCD) and the lower surface (EFGH) of the superimposed body (5) are each provided with a protective sheet [200 mm × 180 mm in size, 0.5 m in thickness]
m, impact-resistant polystyrene, transparent] (not shown).

Strip-shaped polymer film [OP tape, manufactured by Nichiro Kogyo Co., Ltd., a polymer film having a width of 5 cm, a thickness of 110 μm, a length of 80 cm, a releasable surface and easy to avoid in the width direction. ] (6) is divided into one of four sides (AB) constituting the upper surface (ABCD) of the superimposed body (5) and three sides (DC, HG, EF) parallel to the one side. The wire was passed over a point, and both ends were bonded by heat fusion while being in a tension state, and tightened to obtain a package (FIG. 1). Further, using the same belt-shaped polymer film as described above, one of the four sides (AB) constituting the upper surface of the superimposed body (5)
And passes through the midpoint of another side (BC) intersecting with the three sides (AD, FG, EH) parallel to the other side,
The both ends were adhered by heat fusion in a tensioned state and tightened to obtain a package (6) (FIG. 2).

Next, a second film [a multi-layer co-extruded film manufactured by Fujimori Kogyo Co., Ltd.]
P (thickness approx. 50 μm) / NY (thickness approx. 50 μm) / LL
DPE (thickness approx. 50 μm) / NY (thickness approx. 50 μm) /
LLDPE (thickness: about 50 μm)] (10a) is formed into a shape substantially in line with the shape in which the two packages (6) obtained above are arranged. Are placed side by side, and a first film [Fujimori Kogyo Co., Ltd., multilayer laminated film, layer configuration is PET (thickness: about 16 μm) / NY (thickness: about 15 μm) /
Easy peel sealant (thickness: about 30 μm)] (10
b) is placed thereon, and the first film and the second film are heat-sealed (easy-peeled) over the entire circumference thereof while degassing the inside of the inside to form a package (9) (FIGS. 7 and 7). 8).

When the first film and the second film of the package (9) were torn and the inside thereof was confirmed, there was no deformation of the superposed body (5). In this package (9), since the first film and the second film are heat-sealed by easy peel to form the packaging material (10), the two films (10a, 10b) are easily peeled off. After unpacking, the package (6) can be taken out. In addition, since a polymer film that is easy to avoid in the width direction is used as the band-shaped string
The linearly polarizing film (4) with a film laminated adhesive layer can be easily taken out from the package (6).

Comparative Example 1 An optical film laminate (5) with a film laminated adhesive layer obtained in the same manner as in Example 1 was placed in a polyethylene bag (10) without tightening, and the inside was evacuated. The package was sealed and packaged to obtain a package (91) (FIG. 11). This superimposed body (5) was out of shape in the bag (10) (FIG. 12).

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an example of a package of the present invention.

FIG. 2 is a perspective view schematically showing an example of the package of the present invention.

FIG. 3 is a perspective view schematically showing one example of a package of the present invention.

FIG. 4 is a perspective view schematically showing one example of a package of the present invention.

FIG. 5 is a perspective view schematically showing one example of a package of the present invention.

FIG. 6 is a top view schematically showing an example of the package of the present invention.

FIG. 7 is a perspective view schematically showing an example of the package of the present invention.

FIG. 8 is a top view schematically showing an example of the package of the present invention.

FIG. 9 is a schematic diagram showing a cross-sectional structure of an optical film with a film laminated adhesive layer applied to a package (package) of the present invention.

FIG. 10 is a perspective view schematically showing one example of an optical film superimposed body with a film laminated adhesive layer applied to a package (package) of the present invention.

FIG. 11 is a perspective view schematically showing a package of Comparative Example 1.

FIG. 12 is a perspective view schematically showing a shape of an optical film superimposed body with a film-laminated adhesive layer of Comparative Example 1 which is out of shape.

[Explanation of symbols]

1: optical film 2: adhesive layer 3: release film 31: exposed portion of release film 4: optical film with film laminate adhesive layer 5: optical film laminate with film laminate adhesive layer 6: with film laminate adhesive layer Package of optical film superimposed body 7: Strip-shaped string ring 8: Strip-shaped string ring 9: Package of package of optical film superimposed body with film lamination adhesive layer 91: Package 10: Packaging material 10 a: First film 10b: Second film 11: Heat-sealed portion d1: Width of band-shaped string ring (7) d2: Width of band-shaped string ring (8) h: Height of optical film superimposed body with film laminated adhesive layer

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Toshiyuki Honda 5-1, Sokai-cho, Niihama-shi, Ehime F-term (reference) in Sumitomo Chemical Co., Ltd. 2H049 BA02 BA03 BA04 BA06 BB03 BB54 BB62 BC22 3E067 AA12 AB39 AC04 AC14 BA12A BB14A CA04 CA24 DA03 EA06 EC24 FB11 GA19 4J004 AA10 AA14 AB01 CA02 CA03 CA06 CC03 DA02 DA03 DA04 DB02 EA04 FA10

Claims (5)

[Claims] 1. A rectangular optical film having an adhesive layer on one side or both sides, and a plurality of optical films with a film laminated adhesive layer having a release film on the adhesive layer are stacked to form a cube. A package of an optical film superimposed body with a film laminating adhesive layer, which passes through one of four sides constituting an upper surface and three sides parallel to the one side, and is smaller than the length of the one side. A package of an optical film superimposed body with a film laminated adhesive layer, wherein the package is tightened with a band-shaped string ring having a width. 2. An optical film superimposed body with a film laminating adhesive layer passes through another one side intersecting said one side of the four sides constituting the upper surface and three sides parallel to the other side, The package according to claim 1, wherein the package is tightened with a band-shaped cord ring having a width smaller than the length of the other side. 3. An optical device with a film-laminated adhesive layer, wherein the entire package of the optical film-stacked optical film-laminated body according to claim 1 or 2 is surrounded by a packaging material. Packaging of film stack. 4. The package of the optical film laminated body with the film laminated adhesive layer according to claim 1 or 2 is heat-sealed to the entire circumference to cover the upper surface of the package. The package according to claim 3, wherein the package is entirely covered with a first film and a second film covering a lower surface of the package. 5. The package according to claim 4, wherein the first film or the second film is formed according to the shape of the optical film laminated body with a film laminated adhesive layer.