WO2023228598A1

WO2023228598A1 - Film-product transport method

Info

Publication number: WO2023228598A1
Application number: PCT/JP2023/014199
Authority: WO
Inventors: 卓哉田中; 政和望月
Original assignee: 日東電工株式会社
Priority date: 2022-05-26
Filing date: 2023-04-06
Publication date: 2023-11-30
Also published as: JP2023173794A

Abstract

Provided is a film-product transport method that markedly suppresses the occurrence of scratches and fouling. A film-product transport method according to one embodiment of the present invention includes: cutting out a film product of a prescribed size from a film roll; preparing a first packaging film that has a size greater than the size of the film product, and that includes a first base material and a first adhesive layer; preparing a second packaging film that has a size greater than the size of the film product, and that has a second base material and a second adhesive layer; forming a package intermediate body by temporarily fixing a plurality of film products to a first adhesive layer surface of the first packaging film; and forming a package by temporarily fixing the second packaging film to the package intermediate body with the second adhesive layer interposed therebetween, so as to cover the plurality of film products.

Description

How to transport film products

The present invention relates to a method for transporting film products.

Various film products are used for a wide range of purposes. For film products, transportation from the manufacturing site to the point of use is unavoidable. An example of a film product is an optical film used in an image display device. Optical films are required to meet much stricter standards regarding scratches and stains than film products used for other purposes (eg, packaging films). Therefore, when transporting an optical film, in many cases a surface protection film and a separator are temporarily attached to both sides of the optical film, in an attempt to strictly suppress scratches and stains during transport. However, with the development of new uses for image display devices in recent years, scratches and/or stains during transportation, which did not pose a problem until now, have become a substantial problem. For example, even if there are no scratches or stains on the optical film itself, scratches or stains on the surface protection film and/or separator may affect foreign matter inspection during the production of image display devices.

Japanese Patent Application Publication No. 10-186133

The present invention was made to solve the above problems, and its main purpose is to provide a method for transporting film products in which the occurrence of scratches and stains is significantly suppressed.

A method for transporting a film product according to an embodiment of the present invention includes cutting out a film product of a predetermined size from a film original; having a size larger than the size of the film product; a second packaging film having a size larger than the size of the film product and comprising a second substrate and a second adhesive layer; preparing a packaging film; temporarily attaching a plurality of film products to a first adhesive layer surface of the first packaging film to form a packaging intermediate; and covering the plurality of film products. temporarily attaching the second packaging film to the packaging intermediate via the second adhesive layer to form a package.
In one embodiment, in the transportation method, the low-speed peeling force of the first packaging film to the acrylic plate is P _1L , the high-speed peeling force is P _1H , the thickness of the first base material is T ₁ , and the first When the low-speed peeling force of the packaging film No. 2 to the acrylic board is P _2L , the high-speed peeling force is P _2H , and the thickness of the second base material is T ₂ , the following relationship is satisfied:
P _1L ×T ₁ ≦13, and P _2L ×T ₂ ≦13, or
P _1H ×T ₁ ≦13, and P _2H ×T ₂ ≦13
Here, low-speed peeling force means peeling force at a peeling speed of 0.3 m/min, and high-speed peeling force means peeling force at a peeling speed of 30 m/min.
A method for transporting a film product according to another embodiment of the present invention includes cutting out a film product of a predetermined size from a film original; having a size larger than the size of the film product, and including a base material and an adhesive layer. , preparing a packaging film; temporarily attaching a plurality of film products to the adhesive layer surface of the packaging film to form a packaging intermediate; and placing the plurality of film products on the inside. The method includes winding the packaging intermediate into a roll to form a package.
In one embodiment, in the transportation method, the following relationship is satisfied, where P _L is the low-speed peeling force of the packaging film to the acrylic plate, P _H is the high-speed peeling force, and T is the thickness of the base material. :
P _L ×T≦13, or P _H ×T≦13
Here, low-speed peeling force means peeling force at a peeling speed of 0.3 m/min, and high-speed peeling force means peeling force at a peeling speed of 30 m/min.
In one embodiment, the film product includes an optical film. In one embodiment, the optical film includes an adhesive layer. In one embodiment, a separator is temporarily attached to the adhesive layer side of the optical film, and a surface protection film is temporarily attached to the opposite side of the optical film from the adhesive layer.

According to the embodiments of the present invention, it is possible to realize a method for transporting film products in which the occurrence of scratches and stains is significantly suppressed.

FIG. 2 is a schematic perspective view illustrating cutting out of a film product used in a method for transporting a film product according to an embodiment of the present invention. 1 is a schematic cross-sectional view illustrating a typical configuration of an optical film that is an example of a film product. (a) to (c) are schematic cross-sectional views illustrating the formation of a package in a method for transporting film products according to one embodiment of the present invention. 4 is a schematic perspective view illustrating the outline of formation of the package shown in FIG. 3. FIG. FIG. 7 is a schematic perspective view illustrating the formation of a package in a method for transporting film products according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments. In addition, all drawings are schematically represented to facilitate understanding, and do not accurately depict actual conditions.

A. Outline of a method for transporting a film product A method for transporting a film product according to an embodiment of the present invention includes cutting out a film product of a predetermined size from a film material; providing a first packaging film having a size greater than the size of the film product and comprising a second substrate and a second adhesive layer; preparing a second packaging film including; temporarily attaching a plurality of film products to the first adhesive layer surface of the first packaging film to form a packaging intermediate; and temporarily attaching the second packaging film to the packaging intermediate via the second adhesive layer so as to cover the plurality of film products to form a package; Each step will be specifically explained below.

B. Cutting out a film product First, as shown in FIG. 1, a film product 20 is cut out from a film material 10. The raw film is typically long, and in one embodiment is wound into a roll. In the illustrated example, a roll-shaped raw film is fed out and cut out while being transported. Cutting out is performed using any suitable method. Specific examples of cutting include punching with a punching blade (eg, Thomson blade, Pinnacle (registered trademark) blade) and cutting with laser irradiation.

As the film product, any suitable film can be used as long as it can be cut out from a film original and transported. Typical examples of film products include packaging films, optical films, agricultural films, food films, various industrial films, cosmetic films, and medical films. In one embodiment, the film product includes an optical film. The benefits of embodiments of the present invention may be significant when the film product includes an optical film. Optical films are required to meet much stricter standards than film products used for other purposes with respect to scratches and stains during transportation.According to embodiments of the present invention, optical films are subject to much stricter standards regarding scratches and stains during transportation. Not only is the occurrence of the image display device caused by defects in the separator and/or surface protection film significantly suppressed, but also especially when the film product is an optical film including a temporarily attached separator and surface protection film. It is possible to prevent adverse effects on foreign matter inspection during manufacturing.

FIG. 2 is a schematic cross-sectional view illustrating a typical configuration of an optical film (film product). The illustrated film product 20 includes an optical film 21 and an adhesive layer 22, and can be bonded to an image display panel. In this case, typically, a separator 23 is temporarily attached to the adhesive layer 22, and a surface protection film 24 is temporarily attached to the side of the optical film 21 opposite to the adhesive layer 22. With such a configuration, the occurrence of scratches and stains during transportation of the optical film can be further significantly suppressed.

The optical film 21 may be a film composed of a single layer, or may be a laminate. Specific examples of optical films composed of a single layer include polarizers and retardation films. Specific examples of optical films configured as laminates include polarizing plates (typically laminates of a polarizer and a protective film), conductive films for touch panels, surface treatment films, and single layers of these. Examples include an optical film configured and/or a laminate in which optical films configured as a laminate are laminated appropriately depending on the purpose (for example, a circularly polarizing plate for antireflection, a polarizing plate with a conductive layer for a touch panel).

Any suitable separator may be employed as the separator 23. Specific examples include plastic films, non-woven fabrics or papers whose surface is coated with a release agent. Specific examples of release agents include silicone release agents, fluorine release agents, and long-chain alkyl acrylate release agents. Specific examples of plastic films include polyethylene terephthalate (PET) film, polyethylene film, polypropylene film, acrylic resin film, cycloolefin resin film, cellulose resin film such as triacetylcellulose (TAC) film, and polycarbonate resin. An example is film. The thickness of the separator may be, for example, 10 μm to 100 μm.

The surface protection film 24 typically has a base material and an adhesive layer. Examples of materials for forming the base material include ester resins such as polyethylene terephthalate resins, cycloolefin resins such as norbornene resins, olefin resins such as polypropylene, acrylic resins, and triacetyl cellulose (TAC). Examples include cellulose resins, polyamide resins, polycarbonate resins, and copolymer resins thereof. Preferred are ester resins (especially polyethylene terephthalate resins), cycloolefin resins, acrylic resins, TAC, and polycarbonate resins. Such a material has the advantage that it has a sufficiently high modulus of elasticity and is unlikely to be deformed even when tension is applied during transportation and/or bonding. Hereinafter, the adhesive layer of the surface protection film will be referred to as a PF adhesive layer.

The elastic modulus of the base material may be, for example, 2.2 kN/mm ² to 4.8 kN/mm ² . If the elastic modulus of the base material is within this range, it has the advantage that deformation is unlikely to occur even if tension is applied during transportation and/or bonding. Note that the elastic modulus is measured in accordance with JIS K 6781.

The thickness of the base material may be, for example, 30 μm to 100 μm.

Any suitable structure may be adopted as the adhesive layer (PF adhesive layer). Specific examples include acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, urethane adhesives, epoxy adhesives, and polyether adhesives. By adjusting the type, number, combination, and blending ratio of monomers that form the base resin of the adhesive, as well as the amount of crosslinking agent, reaction temperature, reaction time, etc., adhesives can have desired characteristics depending on the purpose. can be prepared. The base resin of the adhesive may be used alone or in combination of two or more. The adhesive constituting the PF adhesive layer is characterized in that the base resin contains a polymer having an active hydrogen-containing functional group. With such a base resin, a PF adhesive layer having a desired storage modulus can be obtained. Details of the adhesive constituting the PF adhesive layer are described in, for example, Japanese Patent Application Laid-Open No. 2018-123281, and the description of the publication is incorporated herein as a reference. The thickness of the PF adhesive layer may be, for example, 10 μm to 100 μm. The storage modulus G' of the PF adhesive layer at 25° C. may be, for example, 0.5×10 ⁶ (Pa) to 3.0×10 ⁶ (Pa). When the storage modulus is within this range, it is possible to obtain an adhesive layer (as a result, a surface protection film) with an excellent balance between adhesiveness and releasability.

The thickness of the surface protection film may be, for example, 40 μm to 150 μm. Note that the thickness of the surface protection film refers to the total thickness of the base material and the PF adhesive layer.

As the adhesive layer 22, a configuration commonly known in the art may be adopted.

Film products are cut into any appropriate size depending on the purpose. When the film product includes an optical film, its size may be, for example, smaller than a tablet size (about 180 mm in height and 250 mm in width), or may be smaller than, for example, smartphone size (about 75 mm in height and 120 mm in width), For example, the size may be for VR goggles (approximately 20 mm in length and 30 mm in width). The smaller the size of the film product, the more significant the benefits of embodiments of the present invention may be. For example, it becomes easy to select the size of the first packaging film and the second packaging film, which will be described later.

C. Packaging film C-1. First Packaging Film The first packaging film typically has a size that is larger than the size of the film product. The first packaging film may have a size that can temporarily attach, for example, 1 to 100 film products, or 1 to 10 film products, or 11 to 50 film products, or 51 to 100 film products.

The first packaging film typically includes a first base material and a first adhesive layer. In the embodiment of the present invention, the low-speed peeling force P _1L of the first packaging film (substantially the first adhesive layer) to the acrylic plate, the high-speed peeling force P _1H , and the thickness of the first base material T ₁ preferably satisfies the following relationship.
P _1L ×T ₁ ≦13 and/or P _1H ×T ₁ ≦13
If P _1L ×T ₁ and/or P _1H ×T ₁ are within such ranges, peeling defects can be satisfactorily suppressed when the first packaging film is peeled for use as a film product. In particular, when the film product is an optical film that includes a temporarily attached separator and a surface protection film, this not only suppresses scratches and stains on the optical film itself, but also prevents the separator and surface protection film from being removed when the first packaging film is removed. /or Lifting and peeling of the surface protection film can be significantly suppressed. As a result, it is possible to prevent adverse effects on foreign matter inspection and the like during the production of image display devices due to defects in the separator and/or surface protection film. More specifically, if either P _1L ×T ₁ or P _1H ×T ₁ is controlled within the above range, the separator and/or Alternatively, lifting and peeling of the surface protection film can be significantly suppressed. Preferably, by controlling both P _1L ×T ₁ and P _1H ×T ₁ within the above range, the separator and/or surface protection film will not float when the first packaging film is peeled off, regardless of the peeling speed. and peeling can be significantly suppressed. P _1L ×T ₁ is more preferably 10 or less, further preferably 7 or less, particularly preferably 5 or less, particularly preferably 3.5 or less. The lower limit of P _1L ×T ₁ may be, for example, 0.3. P _1H ×T ₁ is more preferably 12 or less, further preferably 10 or less, particularly preferably 5 or less, particularly preferably 1 or less. The lower limit of P _1H ×T ₁ may be, for example, 0.3. Here, low-speed peeling force means peeling force at a peeling speed of 0.3 m/min, and high-speed peeling force means peeling force at a peeling speed of 30 m/min. Peeling force can be measured, for example, according to JIS Z 0237:2009.

Any suitable thickness may be adopted as the thickness of the first base material as long as the desired P _1L ×T ₁ and/or P _1H ×T ₁ can be achieved. The thickness of the first base material may be, for example, 130 μm or less, for example, 100 μm or less, for example, 80 μm or less, for example, 50 μm or less, or, for example, It may be 40 μm or less. The thickness of the first base material may be, for example, 10 μm or more, or may be, for example, 20 μm or more. Examples of the material for forming the first base material include those described in Section B regarding the base material of the surface protection film.

Any appropriate peeling force may be adopted as the low-speed peeling force of the first adhesive layer to the acrylic plate as long as the desired P _1L ×T ₁ can be achieved. The low-speed peel force may be, for example, 0.30 N/25 mm or less, or may be, for example, 0.25 N/25 mm or less, or may be, for example, 0.20 N/25 mm or less, or may be, for example, 0. .15 N/25 mm or less, for example, 0.10 N/25 mm or less, or, for example, 0.08 N/25 mm or less. The low speed peeling force may be, for example, 0.03 N/25 mm or more. As the high-speed peeling force of the first pressure-sensitive adhesive layer to the acrylic plate, any appropriate peeling force may be adopted as long as the above-mentioned desired P _1H ×T ₁ can be achieved. The high-speed peeling force may be, for example, 1.80 N/25 mm or less, or may be, for example, 1.00 N/25 mm or less, or may be, for example, 0.70 N/25 mm or less, or may be, for example, 0. It may be .50 N/25 mm or less, or may be, for example, 0.35 N/25 mm or less. The high-speed peel force may be, for example, 0.01 N/25 mm or more.

Any suitable configuration can be adopted as the first adhesive layer as long as the desired peeling force and the desired P _1L x T ₁ and/or P _1H x T ₁ can be achieved. Specific examples include acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, urethane adhesives, epoxy adhesives, polyamide adhesives, polyvinyl ether adhesives, and vinyl acetate/chloride. Examples include vinyl copolymer adhesives, modified polyolefin adhesives, fluororesin adhesives, and polyether adhesives. By adjusting the type, number, combination, and blending ratio of monomers that form the base resin of the adhesive, as well as the amount of crosslinking agent, reaction temperature, reaction time, etc., adhesives can have desired characteristics depending on the purpose. can be prepared. The specific structure of the adhesive is described in, for example, Japanese Patent Application Publication No. 2019-127526. In one embodiment, an acrylic adhesive may be used.

The acrylic adhesive contains a (meth)acrylic polymer as a base polymer. The (meth)acrylic polymer contains alkyl (meth)acrylate as a main component. Examples of the alkyl (meth)acrylates include linear or branched alkyl groups having 1 to 20 carbon atoms. Specific examples include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, s-butyl (meth)acrylate, and t-butyl (meth)acrylate. , pentyl (meth)acrylate, isopentyl (meth)acrylate, neopentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, (meth)acrylic acid Octyl, isooctyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate , (meth)isotridodecyl acrylate, (meth)tetradecyl acrylate, (meth)isotetradecyl acrylate, (meth)pentadecyl acrylate, (meth)cetyl acrylate, (meth)heptadecyl acrylate, (meth)acrylate Examples include octadecyl acrylate, isooctadecyl (meth)acrylate, nonadecyl (meth)acrylate, and aralkyl (meth)acrylate. Note that (meth)acrylic refers to acrylic and/or methacrylic.

The alkyl (meth)acrylate may be contained in an amount of preferably 40% by weight or more, more preferably 50% by weight or more, still more preferably 60% by weight or more, based on the total amount of monomer components forming the (meth)acrylic polymer.

The (meth)acrylic polymer preferably contains a monomer component having a crosslinkable functional group as a copolymerization component. Examples of the monomer having a crosslinkable functional group include a hydroxy group-containing monomer and a carboxyl group-containing monomer. Examples of hydroxy group-containing monomers include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, ( Examples include 8-hydroxyoctyl meth)acrylate, 10-hydroxydecyl (meth)acrylate, 12-hydroxylauryl (meth)acrylate, and (4-hydroxymethylcyclohexyl)-methyl acrylate. Examples of the carboxy group-containing monomer include (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid.

The (meth)acrylic polymer may further contain an acid anhydride group-containing monomer, a caprolactone adduct of acrylic acid, a sulfonic acid group-containing monomer, a phosphoric acid group-containing monomer, etc. as copolymerization components other than the above. In addition, as modifying monomers, vinyl acetate, vinyl propionate, N-vinylpyrrolidone, methylvinylpyrrolidone, vinylpyridine, vinylpiperidone, vinylpyrimidine, vinylpiperazine, vinylpyrazine, vinylpyrrole, vinylimidazole, vinyloxazole, vinylmorpholine, N - Vinyl monomers such as vinylcarboxylic acid amides, styrene, α-methylstyrene, and N-vinylcaprolactam; Cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; Acrylic monomers containing epoxy groups such as glycidyl (meth)acrylate ; Glycol-based acrylic ester monomers such as polyethylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, and methoxypolypropylene glycol (meth)acrylate; Tetrahydrofurfuryl (meth)acrylate , fluorine (meth)acrylate, silicone (meth)acrylate, 2-methoxyethyl acrylate, and other acrylic acid ester monomers may also be used.

The content of the copolymer component in the (meth)acrylic polymer can be appropriately set depending on the purpose. For example, when using a hydroxyl group-containing monomer and/or a carboxyl group-containing monomer as a copolymerization component, the total content of the hydroxyl group-containing monomer and the carboxyl group-containing monomer is preferably 1% to 20% by weight based on the total amount of monomer components. It may be about 2% by weight to about 15% by weight, more preferably about 2% by weight to 15% by weight.

The weight average molecular weight of the (meth)acrylic polymer is preferably about 50,000 to 2,000,000, more preferably about 70,000 to 1,800,000, still more preferably about 100,000 to 1,500,000, particularly preferably about 200,000, in terms of polystyrene. It can be about ~1 million.

The acrylic adhesive can contain a crosslinking agent. Examples of the crosslinking agent include isocyanate crosslinking agents, epoxy crosslinking agents, oxazoline crosslinking agents, aziridine crosslinking agents, carbodiimide crosslinking agents, and metal chelate crosslinking agents. Among these, isocyanate-based crosslinking agents and epoxy-based crosslinking agents are preferred because they have high reactivity with the hydroxy groups and carboxy groups of acrylic polymers and can easily introduce a crosslinked structure. Crosslinking agents can be used alone or in combination. Specific examples of the isocyanate crosslinking agent and the epoxy crosslinking agent include those described in JP 2019-127526A. The amount of the crosslinking agent used is preferably 1.5 parts by weight or more, more preferably 2.0 parts by weight or more, and even more preferably 2.5 parts by weight or more, based on 100 parts by weight of the (meth)acrylic polymer. obtain. If the amount of crosslinking agent used is within this range, appropriate peeling force can be achieved. On the other hand, the amount of the crosslinking agent used may be preferably 20 parts by weight or less, more preferably 15 parts by weight or less, still more preferably 10 parts by weight or less, based on 100 parts by weight of the (meth)acrylic polymer. If the amount of the crosslinking agent used is within this range, appropriate adhesion to the adherend can be achieved.

The acrylic adhesive can contain any suitable additives. Specific examples of additives include polymerization catalysts, crosslinking catalysts, silane coupling agents, tackifiers, plasticizers, softeners, deterioration inhibitors, fillers, colorants, ultraviolet absorbers, antioxidants, and surfactants. and antistatic agents. The type, number, combination, amount, etc. of additives can be appropriately set depending on the purpose.

C-2. Second Packaging Film The second packaging film typically includes a second base material and a second adhesive layer. The second packaging film typically has a size that is larger than the size of the film product. The second packaging film is preferably the same size as the first packaging film. With such a configuration, exposure of the first adhesive layer and/or the second adhesive layer in the formed package can be prevented.

The low-speed peeling force P _2L of the second packaging film (substantially the second adhesive layer) to the acrylic plate, the high-speed peeling force P _2H , and the thickness T ₂ of the second base material are preferably as follows. Satisfied with the relationship.
P _2L ×T ₂ ≦13 and/or P _2H ×T ₂ ≦13
If P _2L ×T ₂ and/or P _2H ×T ₂ are within such ranges, peeling defects can be satisfactorily suppressed when the second packaging film is peeled for use as a film product. In particular, when the film product is an optical film that includes a temporarily attached separator and a surface protection film, this not only suppresses scratches and stains on the optical film itself, but also prevents the separator and surface protection film from being removed when the second packaging film is removed. /or Lifting and peeling of the surface protection film can be significantly suppressed. As a result, it is possible to prevent adverse effects on foreign matter inspection and the like during the production of image display devices due to defects in the separator and/or surface protection film. More specifically, if either P _2L ×T ₂ or P _2H ×T ₂ is controlled within the above range, the separator and/or Alternatively, lifting and peeling of the surface protection film can be significantly suppressed. Preferably, by controlling both P _2L ×T ₂ and P _2H ×T ₂ within the above range, the separator and/or surface protection film will not float when the second packaging film is peeled off, regardless of the peeling speed. and peeling can be significantly suppressed. The preferred ranges of P _2L ×T ₂ and P _2H ×T ₂ , the thickness of the second base material, the low-speed peeling force and high-speed peeling force of the second adhesive layer, and the configuration of the second adhesive layer are as follows: The first packaging film is as described in Section C-1 above. The second packaging film may be the same as the first packaging film or may have a different configuration.

In one embodiment, the first packaging film and the second packaging film satisfy the following relationship.
P _1L ×T ₁ ≦13, and P _2L ×T ₂ ≦13, or
P _1H ×T ₁ ≦13, and P _2H ×T ₂ ≦13
With such a configuration, regardless of whether the first packaging film or the second packaging film is to be peeled off from the package at a peeling speed appropriate to the purpose and situation, the separator and/or surface protection Lifting and peeling of the film can be significantly suppressed. More preferably, the first packaging film and the second packaging film satisfy the following relationship.
P _1L ×T ₁ ≦13, and P _2L ×T ₂ ≦13, and
P _1H ×T ₁ ≦13, and P _2H ×T ₂ ≦13
With such a configuration, regardless of the peeling speed and even when peeling either the first packaging film or the second packaging film from the package, the separator and/or surface protection film can be removed. Lifting and peeling can be significantly suppressed.

D. Formation of packaging intermediate The formation of the packaging intermediate and the package will be described below with reference to FIGS. 3(a) to 3(c) and FIG. 4. As an example, a case will be described in which an optical film (FIG. 2) to which a separator and a surface protection film are temporarily attached is used as a film product. First, as shown in FIG. 3(a), a first packaging film 30 including a first base material 31 and a first adhesive layer 32 is prepared. The first packaging film is as described in Section C-1 above. Next, as shown in FIG. 3(b), a plurality of film products 20 are temporarily attached to the first adhesive layer 32 of the first packaging film 30 to form a packaging intermediate body 50. The number of film products 20 temporarily attached can be appropriately set depending on the desired size of the film product and the size of the first packaging film. When the size of the film product is small, many film products can be included in the packaging intermediate (ultimately, the package), which can improve transportation efficiency. In the film product, the separator may be placed on the first packaging film side, and the surface protection film may be placed on the first packaging film side.

E. Formation of a package Next, as shown in FIG. 3(c) and FIG. A packaging film 40 is temporarily attached to form a package 100. The second packaging film 40 includes a second base material 41 and a second adhesive layer 42 , and is temporarily attached to the film product 20 via the second adhesive layer 42 . The second packaging film is as described in Section C-2 above. Here, if the first packaging film and the second packaging film are the same size, exposure of the first adhesive layer 32 and/or the second adhesive layer 42 is suppressed, so the exposure Adverse effects on transportation caused by the adhesive layer can be suppressed.

The package 100 obtained as described above is provided for transportation. According to an embodiment of the present invention, by transporting such a package, the occurrence of scratches and stains on the film product during transport can be significantly suppressed. In particular, when an optical film with a separator and surface protection film temporarily attached is transported as a film product, the separator and surface protection film significantly suppress scratches and stains on the optical film itself during transportation, and the packaged product is By forming this, scratches and stains on the separator and surface protection film during transportation can be significantly suppressed. As a result, the optical film transported by the method of the embodiment of the present invention does not cause any scratches or stains on the optical film itself, and does not cause scratches or stains on the separator and/or surface protection film to cause damage to the image display device. There is no adverse effect on foreign matter inspection during manufacturing. Furthermore, P _1L ×T ₁ , P _1H ×T ₁ , P _2L ×T ₂ , and/or P _2H ×T ₂ of the first packaging film and the second packaging film are controlled within the above ranges. This can significantly suppress lifting and peeling of the separator and/or surface protection film.

F. Modification FIG. 5 is a schematic perspective view illustrating the formation of a package in a method for transporting film products according to another embodiment of the present invention. As shown in the illustrated example, in this embodiment, only one elongated packaging film 30 including a base material 31 and an adhesive layer 32 is used to form a roll-shaped package. An overview of this embodiment will be explained below. As shown in FIG. 5, while the packaging film 30 unwound from the roll is conveyed, the film product 20 is temporarily attached to the surface of the adhesive layer 32 to form a packaging intermediate. The packaging film (packing intermediate) to which the film product is temporarily attached is continuously wound into a roll after the packaging intermediate is formed, with the film product facing inside. In this way, a roll-shaped package is formed. By transporting such a package, the same effects as those described in Section E above can be obtained.

In this embodiment as well, similarly to the embodiments shown in FIGS. 3(a) to 3(c) and 4, the low-speed peeling force P _L of the packaging film to the acrylic plate, the high-speed peeling force P _H of the base material, The thickness T satisfies the following relationship.
P _L ×T≦13 and/or P _H ×T≦13
With this configuration, especially when an optical film to which a separator and a surface protection film are temporarily attached is transported as a film product, lifting and peeling of the separator and/or surface protection film can be prevented when the packaging film is peeled off. can be significantly suppressed.

Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples.

<Production Examples 1 to 6: Packaging film>
Packaging films A to F having the configurations shown in Table 1 were used. Packaging films A to F are all surface protection films manufactured by Nitto Denko Corporation, and their product names are as follows.
A: RP108C
B:RP109C
C:RP300C
D:RP149C
E:RP159JD
F:CP170U

<Example 1>
By a conventional method, a polarizing plate (optical film) with an adhesive layer having the structure of cycloolefin (COP) protective film (47 μm) / polarizer (5 μm) / COP protective film (24 μm) / adhesive layer (20 μm) is prepared. Created. A separator (thickness: 37 μm) was temporarily attached to the adhesive layer surface of the adhesive layer-attached polarizing plate, and a surface protection film was temporarily attached to the COP protective film surface on the opposite side to the adhesive layer. In addition, as the surface protection film, a surface protection film having a structure of PET base material (50 μm)/PF adhesive layer (10 μm) was used. In this way, a laminate having the structure of surface protection film/COP protection film/polarizer/COP protection film/adhesive layer/separator was produced. The obtained laminate was cut into a size of 20 mm in length and 30 mm in width to obtain a film product.

On the other hand, packaging film A was cut out to a size of 250 mm in length and 300 mm in width. The above film products were placed and temporarily attached on the adhesive layer surface of the cut-out packaging film A in three vertical rows and one horizontal row to form a packaging intermediate. At this time, the separator was temporarily attached so that it was on the packaging film A side. Next, a packaging film A having the same size as the above-mentioned packaging film A was temporarily attached to the packaging intermediate body through the adhesive layer so as to cover the film product, thereby forming a packaging body. Two such packages were produced, stacked one on top of the other with the separator facing upward, and left in a normal environment for 0.5 hour. The packaging film A was peeled off from the package after being left standing, and the state at that time was visually observed. Peeling of the packaging film A consists of two steps: (1) low-speed peeling of the packaging film on the separator side (0.3 m/min), and (2) high-speed peeling of the packaging film on the separator side (30 m/min). I went with the format. Further, peeling was performed twice for each type. The results are shown in Table 2.

<Examples 2 to 8>
A package was formed in the same manner as in Example 1 except that a packaging film was temporarily attached to each side of the film product as shown in Table 2. The obtained package was subjected to the same evaluation as in Example 1. The results are shown in Table 2.

<Comparative example 1>
The film products were laminated as they were (that is, without temporarily attaching the packaging film), left to stand under the same conditions as in Example 1, and then subjected to the same evaluation as in Example 1. The results are shown in Table 2.

In Table 2, "SPV" represents a surface protection film, and "Sepa" represents a separator. Also, "falling off" means that the surface protection film has completely peeled off, "peeling off" means that the surface protection film is still attached but a part of the outer edge has peeled off, and "lifting" means that the surface protection film is attached but a part of the outer edge has peeled off. This means that the outer edge of the surface protection film is adhered, but a part of the inside is peeled off. For example, "largely lifted" means that the degree of lifting is large. "Scratches/dents" means that scratches and/or dents have occurred.

The transportation method according to the embodiment of the present invention can be suitably used for transporting film products, and in particular can be suitably used for transporting optical films to which separators and surface protection films are temporarily attached.

10 Original film 20 Film product 21 Optical film 22 Adhesive layer 23 Separator 24 Surface protection film 30 First packaging film 31 First base material 32 First adhesive layer 40 Second packaging film 41 Second Base material 42 Second adhesive layer 50 Packing intermediate 100 Packing body

Claims

Cutting out a film product of a predetermined size from a film stock;
providing a first packaging film having a size greater than the size of the film product and including a first substrate and a first adhesive layer;
providing a second packaging film having a size greater than the size of the film product and including a second substrate and a second adhesive layer;
Temporarily attaching the plurality of film products to the first adhesive layer surface of the first packaging film to form a packaging intermediate; and applying the second adhesive so as to cover the plurality of film products. temporarily attaching the second packaging film to the packaging intermediate via the agent layer to form a package;
methods of transporting film products, including:
The low-speed peeling force of the first packaging film to the acrylic plate is P 1L , the high-speed peeling force is P 1H , the thickness of the first base material is T 1 , the low-speed peeling force of the second packaging film to the acrylic plate The method for transporting a film product according to claim 1, which satisfies the following relationship, where P 2L is the high-speed peeling force, P 2H is the high-speed peeling force, and T 2 is the thickness of the second base material:
P 1L ×T 1 ≦13, and P 2L ×T 2 ≦13, or
P 1H ×T 1 ≦13, and P 2H ×T 2 ≦13
Here, low-speed peeling force means peeling force at a peeling speed of 0.3 m/min, and high-speed peeling force means peeling force at a peeling speed of 30 m/min.
Cutting out a film product of a predetermined size from a film stock;
providing a packaging film having a size larger than the size of the film product and including a substrate and an adhesive layer;
Temporarily attaching a plurality of the film products to the adhesive layer surface of the packaging film to form a packaging intermediate; and winding the packaging intermediate into a roll with the plurality of film products facing inside. , forming a package;
methods of transporting film products, including:
The method for transporting film products according to claim 3, wherein the following relationship is satisfied, where P L is the low-speed peeling force of the packaging film against the acrylic board, P H is the high-speed peeling force, and T is the thickness of the base material. :
P L ×T≦13, or P H ×T≦13
Here, low-speed peeling force means peeling force at a peeling speed of 0.3 m/min, and high-speed peeling force means peeling force at a peeling speed of 30 m/min.
The method for transporting a film product according to any one of claims 1 to 4, wherein the film product includes an optical film.
The method for transporting a film product according to claim 5, wherein the optical film includes an adhesive layer.
7. The method for transporting a film product according to claim 6, wherein a separator is temporarily attached to the adhesive layer side of the optical film, and a surface protection film is temporarily attached to the opposite side of the optical film to the adhesive layer.