JP2009241955A - Superposed optical film storage method and storage container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage method which enables superposed optical films to be easily stored in a storage container, and to be securely conveyed without being damaged, and also to provide the storage container. <P>SOLUTION: In a method for storing rectangular superposed optical films, the superposed optical films are sandwiched between the upper and lower resin sheets in a storage container that includes a box which is open at the top and a lid which is placed over the box, the box having a frame on the inside of the bottom of the box, and a suction sheet sticking to the upper surface of the frame, the edges of them are clamped and they are placed on the frame of the storage container and sucked by a suction sheet on the surface of the frame. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to an optical film superimposed body storage method and a storage container for storing and transporting an optical film superimposed body.

An optical film such as a polarizing film, a retardation film, or a film obtained by laminating them is useful as one of the optical components constituting the liquid crystal display device, and is a rectangular optical film having a shape that matches the screen of the liquid crystal display device. in use.
Such an optical film is usually used by being transported from a manufacturing factory to the next liquid crystal panel factory.

A plurality of optical films are stacked to form an optical film superimposed body, and further wrapped in a packaging material such as a polyolefin film to form an optical film superimposed body, which is further packed in a cardboard or other container for shipment. There are many cases.
Since this method requires a process of packing and unpacking the storage bag into the box, there is a problem that the operation becomes complicated, so a plate-like shape having guide protrusions for guiding the four corners. In this case, there is proposed a method of placing an optical film superimposed body as it is or packaging it with a film, storing it in a rack, and attaching and transporting the rack to a transfer carriage (see Patent Document 1). )

However, this method may damage the part of the optical film that contacts the guide projections due to shaking during transportation, and in the case of a large optical film, it may be stored in a rack or mounted on a carriage. There is a problem that the labor of the side is difficult.
JP 2007-153353 A

An object of the present invention is to provide an optical film superimposed body storage method and a storage container that can easily store an optical film superimposed body in a storage container and can be reliably transported without being damaged.

As a result of intensive studies on the storage method and storage container of the optical film superimposed body, the present inventor has provided a frame at the bottom of the storage container, an adsorbing sheet is pasted on the top surface of the frame, and the optical film superimposed body is By placing and clamping the sheet, fixing the edge with a clamp, placing it on the gantry, and adsorbing it on the adsorption sheet on the upper surface of the gantry, the optical film superimposed body can be easily stored and optically transported The present inventors have found that the film superimposed body can be reliably transported without moving out of motion, and have reached the present invention.

That is, the present invention is a method for storing a rectangular optical film superimposed body in a storage container, comprising a box having an upper surface opened and an upper lid to be mounted on the box, and having a gantry at the bottom of the box. Then, an optical film superposed body formed by placing and sandwiching a resin sheet on the top and bottom of the optical film superposed body in a storage container having an adsorption sheet attached to the upper surface of the gantry, and fixing its edge with a clamp, A method for storing an optical film superimposed body, wherein the optical film superposed body is placed on a frame in a storage container and adsorbed to an adsorption sheet on the upper surface of the frame.

  Also, a storage container for storing a rectangular optical film superimposed body, comprising a box body having an upper surface opened and an upper lid to be mounted on the box body, and placing and sandwiching resin sheets vertically, A storage container for an optical film superposition body comprising a base for placing an optical film superposition body fixed with a clamp at the bottom of the box, and an adsorption sheet attached to the top surface of the base is there.

  By this invention, an optical film superposition body can be easily accommodated in a storage container, and can be reliably conveyed without being damaged.

1 to 3 are views showing an embodiment of the present invention. 1 is a perspective view, FIG. 2 is a plan view of the box, and FIG. 3 is a cross-sectional view taken along line AA in FIG.
The optical film superimposing body 1 is formed by stacking a plurality of optical films 2, and a resin sheet 3 is arranged on the upper and lower sides of the optical film overlapping body 1, and the edges thereof are fixed with clamps 4.

Examples of the optical film include, but are not limited to, a polarizing film, a light control film, a polarization separation film, a retardation film, and a laminated film thereof.
The shape of such an optical film is often processed into a square having a size corresponding to the screen size of the liquid crystal display device used, for example.
The optical film is usually provided with an adhesive layer on one or both sides in order to simplify the attachment process to the liquid crystal display device. On the other hand, the surface on which the adhesive layer is not provided is provided with a protective film for the purpose of protecting the optical film surface. Then, a release film is attached on the adhesive layer for the purpose of preventing foreign matters such as dust from adhering and optical films from adhering to each other, and is handled as an optical film having an adhesive layer. The release film is removed immediately before being attached to the liquid crystal display device.

As the polarizing film, a film obtained by laminating both surfaces of a polarizer film made of polyvinyl alcohol (PVA) dyed with iodine or a dichroic dye with a film made of triacetyl cellulose (TAC) is used. The thickness of the polarizer film is usually about 15 to 30 μm, and the thickness of the TAC film is usually about 40 to 200 μm. The polarizer film and the TAC film are usually bonded with a polyvinyl alcohol adhesive or the like.
As the retardation film, for example, a uniaxially oriented film obtained by stretching a polycarbonate resin film or the like is used, and its thickness is usually about 30 to 100 μm.

  The polarizing film is a film having a function of transmitting light parallel to the transmission axis direction and absorbing light parallel to the absorption axis direction orthogonal to the transmission axis, and is also referred to as an absorption polarizing film. Usually, it consists of a polarizer and a protective film laminated on both sides of the polarizer, and the polarizer is a film formed by uniaxial stretching, dyeing with a dichroic dye, and boric acid treatment on a polyvinyl alcohol film having a film thickness of about 10 μm to 150 μm. . As the protective film, a cellulose acetate-based resin film, for example, a triacetyl cellulose film is usually used. For example, “Sumikaran (registered trademark) SRW862A” (manufactured by Sumitomo Chemical Co., Ltd.) can be mentioned.

  The polarization separation film is a film having a function of transmitting light parallel to the transmission axis direction and reflecting light parallel to the reflection axis direction orthogonal to the transmission axis, and is a reflective polarizing film, a non-absorbing polarizing film, or Since the reflected light is reused and the brightness is improved, it is also referred to as a brightness enhancement film. Polyester, particularly polyethylene naphthalate or a copolymer mainly composed of polyethylene naphthalate units, has been used as a raw material, and has excellent performance. For example, it is commercially available under the trade name “DBEF” (manufactured by Sumitomo 3M Limited). ing.

The light control film is a film such as a light control film having a property of scattering incident light from a specific angle and transmitting incident light from other angles as it is. ) ”(Manufactured by Sumitomo Chemical Co., Ltd.).

The retardation film is a film imparted with retardation (retardation) by stretching a resin film. For example, a polycarbonate resin, a polysulfone resin, a polyethersulfone resin, a polyarylate resin, a cycloolefin resin, Norbornene resins are mainly used. A well-known method can be employ | adopted for extending | stretching, and longitudinal extending | stretching like extending | stretching between rolls and transverse extending | stretching like tenter extending | stretching are used a lot. Further, the stretching direction may be uniaxial stretching, but there are also those that have been oriented in the thickness direction for adjusting the viewing angle when used in a liquid crystal display device. The retardation value of the retardation film is appropriately determined according to the desired characteristics, but generally a film having a range of about 100 to 1,000 nm is often used. For example, “Sumikalite (registered trademark) SEF440138” (manufactured by Sumitomo Chemical Co., Ltd.), which is a uniaxially stretched retardation film made of polycarbonate and having a thickness of 40 μm, can be mentioned.

  The adhesive constituting the adhesive layer is not particularly limited as long as it is transparent and optically isotropic, and a pressure-sensitive adhesive (pressure-sensitive adhesive) is usually used. As the pressure sensitive adhesive, an acrylic pressure sensitive adhesive, a urethane pressure sensitive adhesive, or the like is used. The thickness of the adhesive layer is approximately 10 μm to 50 μm.

  As a peeling film, a polyethylene film, a polyethylene terephthalate (PET) film, etc. are used normally, and the thickness is 20-40 micrometers normally. Some of these release films have been given release properties by, for example, treating the surface with a silane coupling agent or the like.

  An optical film superposition body is formed by stacking a plurality of optical films. Optical films with a diagonal length of 10 inches or more may be damaged due to the weight of the optical film due to the weight of the optical film, or it may become difficult to handle as the number of stacked films increases. The number of stacked sheets is often about 100 or less. In particular, optical films having a diagonal of 15 inches or more are often stacked up to about 50 sheets or less, and optical films having a diagonal of 30 inches or more are stacked up to about 30 sheets or less.

  Examples of the resin sheet disposed above and below the optical film superimposed body include sheets of polyethylene, polypropylene, acrylic resin, polycarbonate, and the like, but are not limited thereto. An acrylic resin sheet is preferably used from the viewpoint of less bending and cost. At this time, it is preferable to insert a polystyrene sheet softer than the acrylic resin sheet between the optical film and the acrylic resin sheet from the viewpoint of preventing the pressing. The thickness of the resin sheet is usually about 2 to 10 mm.

Resin sheets are arranged on the top and bottom, and the sandwiched optical film stack is fixed with clamps at the edges. The optical film superposed body is chamfered on the side with the resin sheets arranged on the top and bottom, and is fixed with a clamp after completion.
The type of the clamp is not limited, and a clamp of a mold fixed with a screw, a clamp of a mold fixed with a spring, or the like is used, but a handy clamp of a mold fixed with a spring is preferably used.

The storage container for storing the optical film superimposed body 1 includes a box body 10 having an upper surface opened and an upper lid 11 to be mounted on the box body, and has a gantry 12 on which the optical film superimposed body is placed on the bottom of the box body. is doing.
The box, the upper lid, and the mount are made of a polyolefin sheet such as polyethylene or polypropylene for weight reduction. The thickness of the sheet is about 3 to 7 mm depending on the size. Boxes, top lids, mounts, etc. are assembled by riveting the sheets.
The size of the gantry is the same as the size of the optical film superimposed body. In this case, the optical film superimposed body is in contact with the gantry, and the notch 14 is formed in the cradle where the clamp is placed so that the clamp does not contact the upper surface of the gantry. Is provided.
The size of the gantry may be smaller than the size of the optical film superimposed body so that the tip of the clamp comes out of the gantry.

An adsorption sheet 13 is attached to the upper surface of the gantry. As the adsorption sheet, a commercially available “Zeon AL sheet” (manufactured by Zeon Kasei Co., Ltd.) or the like is used.
The adsorbing sheet has sufficient adsorbing power even if it is not attached to the entire surface of the gantry, and can be adsorbed without leaving the optical film superimposed body at several places as shown in FIG.

A resin sheet is arranged on the top and bottom of the box body and sandwiched between them, and an optical film superposed body whose edges are fixed with clamps is placed and adsorbed on the adsorption sheet.
The optical film superposed body fixed by the clamp can be easily held on the hand suction disk.
The box with the optical film superposed body placed thereon is covered with an upper lid and transported.

  You may provide the protrusion guide 15 guided when stacking the other container which accommodated the optical film superposition body in the four corners of an upper cover. The protruding guides are usually provided in an L shape at the four corners of the side surface of the upper lid.

  The transport of the storage container storing the optical film superposed body is carried out by superposing one or several pieces. In either case, the optical film superimposed body can be reliably transported without being damaged.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by these Examples.

  As shown in FIG. 1, 100 sheets of a rectangular polarizing film “Sumikaran (registered trademark) SRW862A” (manufactured by Sumitomo Chemical Co., Ltd.) having a diagonal line of 32 inches is stacked as an optical film, and an acrylic resin sheet having a thickness of 5 mm above and below it. Was placed and clamped, and the side portion was chamfered, and then the four edge portions were fixed with a handy clamp.

Using a polypropylene sheet with a thickness of 5 mm, a box with a size of 950 mm long × 650 mm wide × 115 mm high × 5 mm thick with an open top, a top of 980 mm long × 675 mm wide × 50 mm high × 5 mm thick top cover did.
A base having a size of 715 mm long × 410 mm wide × 30 mm high × 5 mm thick was provided at the bottom of the box. As shown in FIG. 2, the frame was provided with notches at four locations.
As shown in FIG. 2, "Zeon AL sheet" (manufactured by Zeon Kasei Co., Ltd.) having a size of 100 mm in length and 70 mm in width as an adsorbing sheet was attached to the upper surface of the frame.

A plastic sheet is placed between the upper and lower sides, and the optical film stack with its edges fixed with clamps is lifted with a hand suction board, placed on the box base, and absorbed by the suction sheet, and the top cover is placed on the box. Was worn.
This was placed on a truck and transported about 1000 km. Then, when the content was confirmed, the optical film superposition body was not separated from the adsorption sheet, and the optical film was not damaged.

It is a perspective view which shows one embodiment of this invention. It is a front view which shows one embodiment of the box of this invention. It is sectional drawing which shows one embodiment of the box of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical film superimposing body 2 Optical film 3 Resin sheet 4 Clamp 10 Box 11 Upper cover 12 Base 13 Adsorption sheet 14 Notch 15 Projection guide

Claims (7)

  A method of storing a rectangular optical film superposed body in a storage container, comprising a box having an upper surface opened and an upper lid to be mounted on the box, and having a frame at the bottom of the box, the upper surface of the frame An optical film superposition body, in which a resin sheet is placed and sandwiched between the optical film superposition bodies and clamped at the upper and lower sides of the optical film superposition body in a storage container having an adsorbing sheet attached thereto, A method for storing an optical film superposed body, wherein the optical film superposed body is placed on the top surface and adsorbed to an adsorption sheet on a top surface of the mount.   2. The method for storing an optical film superposed body according to claim 1, wherein a notch portion is provided on a mount of a portion where the clamp is placed.   2. The method for storing an optical film superposed body according to claim 1, further comprising protrusion guides for guiding the other containers containing the optical film superposed body in stacking at the four corners of the upper lid.   A storage container for storing a rectangular optical film superimposed body, comprising a box with an upper surface opened and an upper lid to be mounted on the box, and placing and sandwiching resin sheets vertically, A storage container for an optical film superposition body, comprising: a base for placing an optical film superposition body fixed by a clamp at a bottom of the box body; and an adsorption sheet attached to the top surface of the base.   5. The optical film superposed container according to claim 4, further comprising a notch in the frame on which the clamp is placed.   5. The container for storing an optical film superposed body according to claim 4, further comprising protrusion guides for guiding when stacking other containers containing the optical film superposed body at the four corners of the upper lid.   5. The optical film superposed container according to claim 4, wherein the storage container is made of a polyolefin sheet.

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