How to transport film products

Abstract

To provide a method of transporting a film product in which injury and dirt are noticeably suppressed from occurring.SOLUTION: A method of transporting a film product according to one embodiment of the present invention includes: cutting a film product having a predetermined size out of a film stock; preparing a first packing film having a size greater than a size of the film product and including a first base material and a first adhesive layer; preparing a second packing film having a size greater than the size of the film product and including a second base material and a second adhesive layer; temporarily putting a plurality of film products over a first adhesive layer surface of the first packing film and forming an uncompleted pack; and temporarily putting the second packing film over the uncompleted pack through the second adhesive layer in a manner covering over the plurality of film products and forming a pack.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for transporting a film product. [Background technology]

[0002] Various film products are used in a wide range of applications. Transportation of film products from manufacturing sites to their intended use is unavoidable. Optical films used in image display devices are one example. Optical films are subject to significantly stricter standards for scratches and stains than film products used for other applications (e.g., packaging films). Therefore, during transportation, optical films are often temporarily attached with a surface protection film and a separator on both sides to strictly prevent scratches and stains during transportation. However, with the recent development of new applications for image display devices, scratches and / or stains during transportation, which were previously not a problem, have become a substantial issue. For example, even if the optical film itself is free of scratches or stains, scratches or stains on the surface protection film and / or separator may affect foreign matter inspection during the production of image display devices. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-186133 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made to solve the above problems, and its main object is to provide a method for transporting film products in which the occurrence of scratches and stains is significantly suppressed. [Means for solving the problem]

[0005] A method for transporting film products according to one embodiment of the present invention includes: cutting out a film product of a predetermined size from a roll of film; preparing a first packaging film having a size larger than the size of the film product and including a first substrate and a first adhesive layer; preparing a second packaging film having a size larger than the size of the film product and including a second substrate and a second adhesive layer; temporarily attaching a plurality of the 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. In one embodiment, in the transportation method, the low-speed peeling force of the first packaging film to the acrylic plate is P 1L , high speed peeling force P 1H , the thickness of the first substrate is T1, the low-speed peeling force of the second packaging film to the acrylic plate is P 2L , high speed peeling force P 2H When the thickness of the second substrate is T2, the following relationship is satisfied: P 1L ×T1≦13, and P 2L ×T2≦13, or P 1H ×T1≦13, and P 2H ×T2≦13 Here, the low-speed peel force means the peel force at a peel speed of 0.3 m / min, and the high-speed peel force means the peel force at a peel speed of 30 m / min. A method for transporting film products according to another embodiment of the present invention includes cutting out a film product of a predetermined size from a roll of film; preparing a packaging film having a size larger than the size of the film product and including a base material 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 on the inside to form a package. In one embodiment, in the transportation method, the low-speed peeling force of the packaging film to the acrylic plate is P L , high speed peeling force PH When the thickness of the substrate is T, the following relationship is satisfied: P L ×T≦13, or P H ×T≦13 Here, the low-speed peel force means the peel force at a peel speed of 0.3 m / min, and the high-speed peel force means the peel force at a peel speed of 30 m / min. In one embodiment, the film product includes an optical film. In one embodiment, the optical film includes a pressure-sensitive adhesive layer. In one embodiment, a separator is temporarily attached to the pressure-sensitive adhesive layer side of the optical film, and a surface protection film is temporarily attached to the side of the optical film opposite the pressure-sensitive adhesive layer. [Effects of the Invention]

[0006] According to an embodiment of the present invention, a method for transporting film products can be realized in which the occurrence of scratches and stains is significantly suppressed. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic perspective view illustrating cutting out of a film product used in a film product transport method according to an embodiment of the present invention. [Figure 2] FIG. 1 is a schematic cross-sectional view illustrating a typical configuration of an optical film, which is an example of a film product. [Figure 3] 1(a) to 1(c) are schematic cross-sectional views illustrating the formation of a package in a method for transporting a film product according to one embodiment of the present invention. [Figure 4] FIG. 4 is a schematic perspective view illustrating an outline of the formation of the packaging body of FIG. 3. [Figure 5] 10 is a schematic perspective view illustrating the formation of a package in a method for transporting a film product according to another embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] 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, to facilitate understanding, all drawings are schematic and do not accurately depict actual conditions.

[0009] A. Overview of film product transportation methods A method for transporting film products according to one embodiment of the present invention includes: cutting out a film product of a predetermined size from a raw film; preparing a first packaging film larger than the film product and including a first substrate and a first adhesive layer; preparing a second packaging film larger than the film product and including a second substrate and a second adhesive layer; temporarily attaching multiple 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 multiple film products to form a package. Each step is described in detail below.

[0010] B. Cutting out film products First, as shown in FIG. 1, a film product 20 is cut out from a raw film roll 10. The raw film roll is typically long and, in one embodiment, is wound into a roll. In the illustrated example, the rolled raw film is unwound and cut out while being transported. Cutting is performed using any appropriate method. Specific examples of cutting include punching with a punching blade (e.g., a Thomson blade or a Pinnacle (registered trademark) blade) and cutting by laser irradiation.

[0011] The film product may be any suitable film that can be cut from a roll of film and transported. Representative 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. When the film product includes an optical film, the effects of the present invention become more pronounced. Optical films are required to meet significantly stricter standards for scratches and stains during transportation than film products used for other purposes. According to the present invention, not only are scratches and stains on the optical film significantly reduced during transportation, but also, particularly when the film product is an optical film including a temporarily attached separator and a surface protective film, adverse effects on foreign matter inspection during the production of an image display device due to defects in the separator and / or the surface protective film can be prevented.

[0012] 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 a pressure-sensitive adhesive layer 22, and is capable of being attached to an image display panel. In this case, typically, a separator 23 is temporarily attached to the pressure-sensitive adhesive layer 22, and a surface protection film 24 is temporarily attached to the side of the optical film 21 opposite the pressure-sensitive adhesive layer 22. With this configuration, the occurrence of scratches and stains on the optical film during transportation can be further significantly reduced.

[0013] 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 composed as laminates include polarizing plates (typically, laminates of a polarizer and a protective film), conductive films for touch panels, surface-treated films, and laminates obtained by appropriately laminating these single-layer optical films and / or optical films composed as laminates according to the purpose (for example, anti-reflection circular polarizing plates, polarizing plates with a conductive layer for touch panels).

[0014] Any appropriate separator can be used as the separator 23. Specific examples include plastic films, nonwoven fabrics, and paper whose surfaces are coated with a release agent. Specific examples of release materials include silicone-based release agents, fluorine-based release agents, and long-chain alkyl acrylate-based release agents. Specific examples of plastic films include polyethylene terephthalate (PET) films, polyethylene films, polypropylene films, acrylic resin films, cycloolefin-based resin films, cellulose-based resin films such as triacetyl cellulose (TAC) films, and polycarbonate-based resin films. The thickness of the separator can be, for example, 10 μm to 100 μm.

[0015] The surface protection film 24 typically includes a substrate and a pressure-sensitive adhesive layer. Examples of materials for the substrate include ester resins such as polyethylene terephthalate resins, cycloolefin resins such as norbornene resins, olefin resins such as polypropylene, acrylic resins, cellulose resins such as triacetyl cellulose (TAC), polyamide resins, polycarbonate resins, and copolymer resins thereof. Preferred are ester resins (particularly polyethylene terephthalate resins), cycloolefin resins, acrylic resins, TAC, and polycarbonate resins. These materials have the advantage of having a sufficiently high elastic modulus and are less likely to deform even when tension is applied during transportation and / or lamination. Hereinafter, the pressure-sensitive adhesive layer of the surface protection film will be referred to as a PF pressure-sensitive adhesive layer.

[0016] The elastic modulus of the substrate is, for example, 2.2 kN / mm 2 ~4.8kN / mm 2 If the elastic modulus of the substrate is within this range, there is an advantage that deformation is unlikely to occur even when tension is applied during transportation and / or lamination. The elastic modulus is measured in accordance with JIS K 6781.

[0017] The thickness of the substrate can be, for example, 30 μm to 100 μm.

[0018] The pressure-sensitive adhesive layer (PF pressure-sensitive adhesive layer) may have any suitable structure. Specific examples include acrylic pressure-sensitive adhesives, rubber pressure-sensitive adhesives, silicone pressure-sensitive adhesives, polyester pressure-sensitive adhesives, urethane pressure-sensitive adhesives, epoxy pressure-sensitive adhesives, and polyether pressure-sensitive adhesives. Pressure-sensitive adhesives with desired properties can be prepared by adjusting the type, number, combination, and compounding ratio of monomers forming the base resin of the pressure-sensitive adhesive, as well as the amount of crosslinking agent, reaction temperature, reaction time, and other factors. The base resins of the pressure-sensitive adhesive may be used alone or in combination of two or more. The pressure-sensitive adhesive constituting the PF pressure-sensitive adhesive layer is characterized in that the base resin contains a polymer having an active hydrogen-containing functional group. Such a base resin can provide a PF pressure-sensitive adhesive layer with a desired storage modulus. Details of the pressure-sensitive adhesive constituting the PF pressure-sensitive adhesive layer are described, for example, in JP 2018-123281 A, the disclosure of which is incorporated herein by reference. The thickness of the PF pressure-sensitive adhesive layer may be, for example, 10 μm to 100 μm. The storage modulus G' of the PF adhesive layer at 25°C is, for example, 0.5 × 10 6 (Pa) ~ 3.0 × 10 6 (Pa) If the storage modulus is within this range, it is possible to obtain a pressure-sensitive adhesive layer (and consequently a surface protection film) that has an excellent balance between adhesiveness and releasability.

[0019] The thickness of the surface protection film may be, for example, 40 μm to 150 μm, where the thickness of the surface protection film refers to the total thickness of the substrate and the PF pressure-sensitive adhesive layer.

[0020] The adhesive layer 22 may have a structure that is well known and commonly used in the art.

[0021] The film product is cut to any appropriate size depending on the purpose. When the film product includes an optical film, the size may be, for example, tablet size (approximately 180 mm long and 250 mm wide) or less, or may be, for example, smartphone size (approximately 75 mm long and 120 mm wide) or less, or may be, for example, VR goggle size (approximately 20 mm long and 30 mm wide). The smaller the size of the film product, the more pronounced the effects of the embodiments of the present invention. For example, it becomes easier to select the sizes of the first packaging film and the second packaging film described below.

[0022] C. Packaging film C-1. First packaging film The first packaging film typically has a size larger than the size of the film products, and may have a size that allows temporary attachment of, for example, 1 to 100, for example, 1 to 10, for example, 11 to 50, or for example, 51 to 100 film products.

[0023] The first packaging film typically includes a first substrate and a first adhesive layer. In an embodiment of the present invention, the low-speed peel force P of the first packaging film (substantially the first adhesive layer) to the acrylic plate is 1L , high-speed peeling force P 1H The thickness T1 of the first base material preferably satisfies the following relationship: P 1L ×T1≦13, and / or P 1H ×T1≦13 P 1L ×T1 and / or P 1HIf ×T1 is within this range, peeling failure can be effectively suppressed when peeling off the first packaging film for use in the film product. In particular, when the film product is an optical film including a temporarily attached separator and surface protective film, not only is scratching and staining of the optical film itself suppressed, but lifting and peeling of the separator and / or surface protective film when peeling off the first packaging film can be significantly suppressed. As a result, it is possible to prevent adverse effects on foreign matter inspection during the manufacture of image display devices, etc., due to defects in the separator and / or surface protective film. More specifically, P 1L ×T1 or P 1H By controlling either of P × T1 within the above range, lifting and peeling of the separator and / or surface protection film can be significantly suppressed when peeling the first packaging film at a peeling speed appropriate for the purpose and situation. 1L ×T1 and P 1H By controlling both of the above-mentioned ranges, lifting and peeling of the separator and / or surface protection film can be significantly suppressed when the first packaging film is peeled, regardless of the peeling speed. 1L ×T1 is more preferably 10 or less, even more preferably 7 or less, particularly preferably 5 or less, and especially preferably 3.5 or less. 1L The lower limit of ×T1 may be, for example, 0.3. 1H ×T1 is more preferably 12 or less, even more preferably 10 or less, particularly preferably 5 or less, and especially preferably 1 or less. 1H The lower limit of ×T1 may be, for example, 0.3. Here, the low-speed peel strength refers to the peel strength at a peel speed of 0.3 m / min, and the high-speed peel strength refers to the peel strength at a peel speed of 30 m / min. The peel strength may be measured, for example, in accordance with JIS Z 0237:2009.

[0024] The thickness of the first base material is set to the desired P 1L ×T1 and / or P 1HAny appropriate thickness can be adopted as long as ×T1 can be realized. The thickness of the first substrate may be, for example, 130 μm or less, or, for example, 100 μm or less, or, for example, 80 μm or less, or, for example, 50 μm or less, or, for example, 40 μm or less. The thickness of the first substrate may be, for example, 10 μm or more, or, for example, 20 μm or more. Examples of materials for forming the first substrate include those described in Section B regarding the substrate of the surface protection film.

[0025] The low-speed peel strength of the first pressure-sensitive adhesive layer from the acrylic plate is 1L Any appropriate peel force can be adopted as long as the above-mentioned desired P × T1 can be realized. The low-speed peel force may be, for example, 0.30 N / 25 mm or less, or, for example, 0.25 N / 25 mm or less, or, for example, 0.20 N / 25 mm or less, or, for example, 0.15 N / 25 mm or less, or, for example, 0.10 N / 25 mm or less, or, for example, 0.08 N / 25 mm or less. The low-speed peel force may be, for example, 0.03 N / 25 mm or more. The high-speed peel force of the first pressure-sensitive adhesive layer from the acrylic plate is set to be equal to or greater than the above-mentioned desired P 1H Any appropriate peel force can be employed as long as ×T1 can be realized. The high-speed peel force may be, for example, 1.80 N / 25 mm or less, or, for example, 1.00 N / 25 mm or less, or, for example, 0.70 N / 25 mm or less, or, for example, 0.50 N / 25 mm or less, or, 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.

[0026] The first adhesive layer has the desired peel strength and the desired P 1L ×T1 and / or P 1LAny suitable structure may be employed as long as the required T1 is achieved. Specific examples include acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, urethane adhesives, epoxy adhesives, polyamide adhesives, polyvinyl ether adhesives, vinyl acetate / vinyl chloride copolymer adhesives, modified polyolefin adhesives, fluororesin adhesives, and polyether adhesives. By adjusting the type, number, combination, and compounding ratio of the monomers forming the adhesive's base resin, as well as the amount of crosslinking agent, reaction temperature, reaction time, and the like, an adhesive with desired properties can be prepared. Specific adhesive structures are described, for example, in JP 2019-127526 A. In one embodiment, an acrylic adhesive may be used.

[0027] The acrylic adhesive contains a (meth)acrylic polymer as a base polymer. The (meth)acrylic polymer contains an alkyl (meth)acrylate as a main component. Examples of the alkyl (meth)acrylate 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, t-butyl (meth)acrylate, pentyl (meth)acrylate, isopentyl (meth)acrylate, neopentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, and (meth)acrylate. Examples of the acrylate include dodecyl acrylate, isotridodecyl (meth)acrylate, tetradecyl (meth)acrylate, isotetradecyl (meth)acrylate, pentadecyl (meth)acrylate, cetyl (meth)acrylate, heptadecyl (meth)acrylate, octadecyl (meth)acrylate, isooctadecyl (meth)acrylate, nonadecyl (meth)acrylate, and aralkyl (meth)acrylate. Note that (meth)acrylic refers to acrylic and / or methacrylic.

[0028] The alkyl (meth)acrylate may be contained in an amount of preferably 40% by weight or more, more preferably 50% by weight or more, and even more preferably 60% by weight or more, based on the total amount of monomer components forming the (meth)acrylic polymer.

[0029] 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 carboxy group-containing monomer. Examples of the hydroxy group-containing monomer include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 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.

[0030] The (meth)acrylic polymer may further contain, as copolymerization components other than those mentioned above, an acid anhydride group-containing monomer, a caprolactone adduct of acrylic acid, a sulfonic acid group-containing monomer, a phosphoric acid group-containing monomer, and the like. Further, as the modifying monomer, vinyl acetate, vinyl propionate, N-vinylpyrrolidone, methyl vinylpyrrolidone, vinylpyridine, vinylpiperidone, vinylpyrimidine, vinylpiperazine, vinylpyrazine, vinylpyrrole, vinylimidazole, vinyloxazole, vinylmorpholine, N-vinylcarboxylic acid amides, styrene, α-methylstyrene, vinyl monomers such as N-vinylcaprolactam; cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; epoxy group-containing acrylic monomers 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, acrylic acid ester monomers such as 2-methoxyethyl acrylate, etc. may also be used.

[0031] The content of copolymerization components in the (meth)acrylic polymer can be appropriately set depending on the purpose. For example, when a hydroxyl group-containing monomer and / or a carboxyl group-containing monomer is used as the copolymerization component, the total content of the hydroxyl group-containing monomer and the carboxyl group-containing monomer is preferably about 1 wt % to 20 wt %, more preferably about 2 wt % to 15 wt %, based on the total amount of the monomer components.

[0032] The weight average molecular weight of the (meth)acrylic polymer, in terms of polystyrene, may be preferably about 50,000 to 2,000,000, more preferably about 70,000 to 1,800,000, even more preferably about 100,000 to 1,500,000, and particularly preferably about 200,000 to 1,000,000.

[0033] The acrylic pressure-sensitive adhesive may contain a crosslinking agent. Examples of crosslinking agents include isocyanate-based crosslinking agents, epoxy-based crosslinking agents, oxazoline-based crosslinking agents, aziridine-based crosslinking agents, carbodiimide-based crosslinking agents, and metal chelate-based crosslinking agents. Among these, isocyanate-based crosslinking agents and epoxy-based crosslinking agents are preferred due to their high reactivity with the hydroxyl and carboxyl groups of the acrylic polymer and the ease with which crosslinked structures can be introduced. Crosslinking agents can be used alone or in combination. Specific examples of isocyanate-based crosslinking agents and epoxy-based crosslinking agents include those described in JP 2019-127526 A. The amount of 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, per 100 parts by weight of the (meth)acrylic polymer. When the amount of crosslinking agent used is within this range, an appropriate peel strength 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, and even more preferably 10 parts by weight or less, relative to 100 parts by weight of the (meth)acrylic polymer. When the amount of the crosslinking agent used is within this range, appropriate adhesion to the adherend can be achieved.

[0034] The acrylic pressure-sensitive adhesive may contain any appropriate additive. Specific examples of the additive include a polymerization catalyst, a crosslinking catalyst, a silane coupling agent, a tackifier, a plasticizer, a softener, an antidegradant, a filler, a colorant, an ultraviolet absorber, an antioxidant, a surfactant, and an antistatic agent. The type, number, combination, and amount of the additive may be appropriately determined depending on the purpose.

[0035] C-2. Secondary packaging film The second packaging film typically includes a second substrate and a second adhesive layer. The second packaging film typically has a size larger than the size of the film product. The second packaging film is preferably the same size as the first packaging film. With this configuration, exposure of the first adhesive layer and / or the second adhesive layer can be prevented in the resulting package.

[0036] The low-speed peel force P of the second packaging film (substantially the second adhesive layer) to the acrylic plate 2L , high-speed peeling force P 2H The thickness T2 of the first base material preferably satisfies the following relationship: P 2L ×T2≦13, and / or P 2H ×T2≦13 P 2L ×T2 and / or P 2H If ×T2 is within this range, peeling failure can be effectively suppressed when peeling off the second packaging film for use of the film product. In particular, when the film product is an optical film including a temporarily attached separator and surface protective film, not only is scratching and staining of the optical film itself suppressed, but lifting and peeling of the separator and / or surface protective film when peeling off the second packaging film can be significantly suppressed. As a result, it is possible to prevent adverse effects on foreign matter inspection during the manufacture of an image display device, etc., due to defects in the separator and / or surface protective film. More specifically, P 2L ×T2 or P 2H By controlling either of P × T2 within the above range, lifting and peeling of the separator and / or surface protection film can be significantly suppressed when peeling the second packaging film at a peeling speed appropriate for the purpose and situation. 2L ×T2 and P 2H By controlling both of the above-mentioned ranges, lifting and peeling of the separator and / or surface protection film can be significantly suppressed when the second packaging film is peeled off, regardless of the peeling speed. 2L ×T2 and P 2H The preferred range of ×T2, the thickness of the second substrate, the low-speed peel strength and high-speed peel strength of the second PSA layer, and the configuration of the second PSA layer are as described above in paragraph C-1 for the first packaging film. The second packaging film may be the same as or different from the first packaging film.

[0037] In one embodiment, the first packaging film and the second packaging film satisfy the following relationship: P 1L ×T1≦13, and P 2L ×T2≦13, or P 1H ×T1≦13, and P 2H ×T2≦13 With this configuration, lifting and peeling of the separator and / or surface protection film can be significantly suppressed regardless of whether the first packaging film or the second packaging film is peeled from the package at a peeling speed appropriate for the purpose and circumstances. More preferably, the first packaging film and the second packaging film satisfy the following relationship. P 1L ×T1≦13, and P 2L ×T2≦13, and P 1H ×T1≦13, and P 2H ×T2≦13 With this configuration, regardless of the peeling speed and whether the first packaging film or the second packaging film is peeled from the packaging body, lifting and peeling of the separator and / or surface protective film can be significantly suppressed.

[0038] D. Formation of packaging intermediates The formation of a packaging intermediate and a packaging body will be described below with reference to FIGS. 3(a) to 3(c) and 4. As an example, a case will be described in which an optical film (FIG. 2) to which a separator and a surface protective 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 substrate 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), multiple film products 20 are temporarily attached to the first adhesive layer 32 of the first packaging film 30 to form a packaging intermediate 50. The number of film products 20 temporarily attached can be appropriately determined 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 packaging body), thereby improving transportation efficiency. The separator of the film product may be placed on the first packaging film side, or the surface protective film may be placed on the first packaging film side.

[0039] E. Packaging Formation Next, as shown in Figures 3(c) and 4, a second packaging film 40 is temporarily attached to the packaging intermediate 50 so as to cover the multiple film products 20 temporarily attached to the first packaging film 30, thereby forming a packaging body 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 products 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 31 and / or the second adhesive layer 32 is suppressed, and therefore adverse effects on transportation caused by the exposed adhesive layer can be suppressed.

[0040] The package 100 obtained as described above is then transported. According to an embodiment of the present invention, by transporting such a package, scratches and stains on the film product during transport can be significantly reduced. In particular, when an optical film to which a separator and a surface protective film are temporarily attached is transported as a film product, the separator and the surface protective film significantly reduce scratches and stains on the optical film itself during transport, and by forming a package, scratches and stains on the separator and the surface protective film can be significantly reduced. As a result, the optical film transported by the method of an embodiment of the present invention is free from scratches and stains, and scratches and stains on the separator and / or the surface protective film do not adversely affect foreign matter inspection during the manufacture of an image display device. Furthermore, the P of the first packaging film and the second packaging film 1L ×T1, P 1H ×T1, P 2L ×T2 and / or P 2H By controlling ×T2 within the above range, lifting and peeling of the separator and / or surface protective film can be significantly suppressed.

[0041] F. Variations 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 illustration, in this embodiment, a roll-shaped package is formed using only one long packaging film 30 including a base material 31 and a pressure-sensitive adhesive layer 32. The following is an overview of this embodiment. As shown in FIG. 5, while the packaging film 30 unwound from a roll is transported, a film product 20 is temporarily attached to the surface of the pressure-sensitive adhesive layer 32 to form a packaging intermediate. The packaging film (packaging intermediate) to which the film product is temporarily attached is wound into a roll with the film product facing inward, immediately after the formation of the packaging intermediate. 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.

[0042] In this embodiment, as in the embodiment shown in FIGS. 3(a) to 3(c) and 4, the low-speed peel force P L , high-speed peeling force P H The thickness T of the substrate satisfies the following relationship: P L ×T≦13, and / or P H ×T≦13 With this configuration, particularly when an optical film to which a separator and a surface protective film are temporarily attached is transported as a film product, lifting and peeling of the separator and / or surface protective film when the packaging film is peeled off can be significantly suppressed. [Example]

[0043] The present invention will be specifically explained below with reference to examples, but the present invention is not limited to these examples.

[0044] <Production Examples 1 to 6: Packaging Film> Packaging films A to F were used, each having the configuration shown in Table 1. Packaging films A to F are all surface protection films manufactured by Nitto Denko Corporation, and the product names are as follows. A:RP108C B:RP109C C:RP300C D:RP149C E:RP159JD F:CP170U

[0045] [Table 1]

[0046] Example 1 A polarizing plate (optical film) with a pressure-sensitive adhesive layer was prepared using a standard method. The polarizing plate had a structure of cycloolefin (COP) protective film (47 μm), polarizer (5 μm), COP protective film (24 μm), and adhesive layer (20 μm). A separator (37 μm thick) was temporarily attached to the adhesive layer surface of the pressure-sensitive adhesive layer-attached polarizing plate, and a surface protective film was temporarily attached to the surface of the COP protective film on the side opposite the adhesive layer. The surface protective film used had a structure of PET substrate (50 μm) and PF adhesive layer (10 μm). In this way, a laminate with a structure of surface protective film / COP protective film / polarizer / COP protective film / adhesive layer / separator was prepared. The resulting laminate was cut into a size of 20 mm long and 30 mm wide to obtain a film product.

[0047] Separately, packaging film A was cut into a size of 250 mm vertically and 300 mm horizontally. The above-mentioned film products were placed on the surface of the adhesive layer of the cut-out packaging film A in three vertical rows and one horizontal row and temporarily attached to form a packaging intermediate. The separator was temporarily attached on the packaging film A side. Next, packaging film A of the same size as the above-mentioned packaging film A was temporarily attached to the packaging intermediate via the adhesive layer so as to cover the film products, forming a package. Two such packages were produced, stacked with the separator facing upward, and left under normal conditions for 0.5 hours. After leaving the package, packaging film A was peeled from the package, and the condition was visually observed. Packaging film A was peeled using two methods: (1) low-speed peeling (0.3 m / min) of the packaging film on the separator side, and (2) high-speed peeling (30 m / min) of the packaging film on the separator side. Each peeling method was performed twice. The results are shown in Table 2.

[0048] <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 resulting package was subjected to the same evaluation as in Example 1. The results are shown in Table 2.

[0049] <Comparative Example 1> The film products were laminated as they were (i.e., without temporarily attaching a packaging film), and 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.

[0050] [Table 2]

[0051] In Table 2, "SPV" represents the surface protection film, and "Separator" represents the separator. "Fallen" means that the surface protection film has completely peeled off, "peeling" means that the surface protection film is still attached but part of the outer edge has peeled off, and "lifting" means that the outer edge of the surface protection film is still attached but part of the inside has peeled off; for example, "large lifting" means that the degree of lifting is large. "Scratches / dents" means that scratches and / or dents have occurred. [Industrial Applicability]

[0052] 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 protective films are temporarily attached. [Explanation of symbols]

[0053] 10 Film rolls 20 Film Products 21 Optical Film 22 adhesive layer 23 Separator 24 Surface protection film 30 First packaging film 31 First substrate 32 First adhesive layer 40 Secondary Packaging Film 41 Second substrate 42 Second adhesive layer 50 Packaging intermediates 100 packages

Claims

1. Cutting out film products of a predetermined size from the film roll; preparing a first packaging film having a size larger than that of the film product and including a first substrate and a first adhesive layer; preparing a second packaging film having a size larger than that of the film product and including a second substrate and a second adhesive layer; temporarily attaching a plurality of the film products to the first pressure-sensitive adhesive layer surface of the first packaging film to form an intermediate package; 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, thereby forming a package; Including, A method for transporting a film product, wherein the following relationship is satisfied when the low-speed peel strength of the first packaging film from an acrylic plate is P 1L , the high-speed peel strength is P 1H , the thickness of the first substrate is T 1 , the low-speed peel strength of the second packaging film from an acrylic plate is P 2L , the high-speed peel strength is P 2H , and the thickness of the second substrate is T 2 : P 1L ×T 1 ≦13 and P 2L ×T 2 ≦13, or P 1H ×T 1 ≦13, and P 2H ×T 2 ≦13 Here, the low-speed peeling force means the peeling force at a peeling speed of 0.3 m / min, and the high-speed peeling force means the peeling force at a peeling speed of 30 m / min.

2. Cutting out film products of a predetermined size from the film roll; preparing a packaging film having a size larger than that of the film product and including a substrate and a pressure-sensitive adhesive layer; temporarily attaching a plurality of the film products to the adhesive layer surface of the packaging film to form an intermediate package; and winding the intermediate packaging body into a roll with the plurality of film products on the inside to form a package; Including, A method for transporting a film product, wherein the following relationship is satisfied when the low-speed peel strength of the packaging film to an acrylic plate is P L , the high-speed peel strength is P H , and the thickness of the substrate is T: P L × T≦13, or P H × T≦13 Here, the low-speed peeling force means the peeling force at a peeling speed of 0.3 m / min, and the high-speed peeling force means the peeling force at a peeling speed of 30 m / min.

3. The method for transporting a film product according to claim 1 or 2, wherein the film product comprises an optical film.

4. The method for transporting a film product according to claim 3 , wherein the optical film includes a pressure-sensitive adhesive layer.

5. The method for transporting a film product according to claim 4 , wherein a separator is temporarily attached to the pressure-sensitive adhesive layer side of the optical film, and a surface protection film is temporarily attached to the side of the optical film opposite to the pressure-sensitive adhesive layer.

Images