Method for transporting film products

Abstract

Provided is a method for transporting a film product in which the generation of scratches and dirt is significantly suppressed. A method for transporting a film product according to one embodiment of the present invention comprises: cutting a film product of a predetermined size from an original film; preparing a first packaging film having a size larger than the size of the film product and including a first base material 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 base material and a second adhesive layer; temporarily attaching a plurality of film products to the first adhesive layer surface of the first bale film to form a bale intermediate; and temporarily bonding a second packaging film to the packaging intermediate body via the second adhesive layer so as to cover the plurality of film products, thereby forming a packaged body.

Description

Technical Field

[0001] The present invention relates to a method for conveying a film product. Background Art

[0002] Various film products have been used for a wide range of purposes. For film products, transportation from the manufacturing point to the place of use is inevitable. As an example of a film product, an optical film for an image display device can be cited. For optical films, compared with film products used for other purposes (for example, packaging films), significantly stricter standards are required for scratches and dirt. Therefore, when transporting an optical film, in most cases, a surface protection film and a diaphragm are temporarily attached to both sides to try to strictly suppress scratches and dirt during transportation. However, with the development of new uses for image display devices in recent years, scratches and / or dirt during transportation that were not a problem before have become a substantial problem. For example, even if the optical film itself does not produce scratches or dirt, sometimes the scratches or dirt on the surface protection film and / or diaphragm will affect the inspection of foreign matter during the manufacture of the image display device.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 10-186133 Summary of the invention

[0006] Problems to be solved by the invention

[0007] The present invention has been made to solve the above-mentioned problems, and a main object of the present invention is to provide a method for conveying a film product in which the generation of scratches and stains is significantly suppressed.

[0008] Solutions to the problem

[0009] A method for transporting a film product according to an embodiment of the present invention comprises: cutting a film product of a given size from an original film; preparing a first packaging film having a size larger than that of the film product and comprising a first substrate and a first adhesive layer; preparing a second packaging film having a size larger than that of the film product and comprising a second substrate and a second adhesive layer; temporarily bonding a plurality of the film products to the first adhesive layer of the first packaging film to form a packaging intermediate; and temporarily bonding the second packaging film to the packaging intermediate via the second adhesive layer in a manner covering the plurality of film products to form a packaging body.

[0010] In one embodiment, in the above-mentioned transport method, the low-speed peeling force of the above-mentioned first packaging film with respect to the acrylic plate is set to P 1L , high-speed peeling force is set as P 1H, the thickness of the first substrate is T1, and the low-speed peeling force of the second packaging film relative to the acrylic plate is P 2L , high-speed peeling force is set as P 2H , when the thickness of the second substrate is set to T2, the following relationship is satisfied:

[0011] P 1L ×T1≤13 and P 2L ×T2≤13; or

[0012] P 1H ×T1≤13 and P 2H ×T2≤13,

[0013] Here, the low-speed peeling force refers to the peeling force at a peeling speed of 0.3 m / min, and the high-speed peeling force refers to the peeling force at a peeling speed of 30 m / min.

[0014] A method for transporting a film product according to another embodiment of the present invention comprises: cutting a film product of a given size from an original film; preparing a packaging film having a size larger than that of the film product and comprising a substrate and an adhesive layer; temporarily bonding a plurality of the film products to the adhesive layer of the packaging film to form a packaging intermediate; and winding the packaging intermediate into a roll in a manner such that the plurality of film products are placed inside to form a packaging body.

[0015] In one embodiment, in the above-mentioned transport method, the low-speed peeling force of the above-mentioned packaging film with respect to the acrylic plate is set to P L , high-speed peeling force is set as P H , when the thickness of the substrate is set to T, the following relationship is satisfied:

[0016] P L ×T≤13 or P H ×T≤13

[0017] Here, the low-speed peeling force refers to the peeling force at a peeling speed of 0.3 m / min, and the high-speed peeling force refers to the peeling force at a peeling speed of 30 m / min.

[0018] In one embodiment, the film product comprises an optical film. In one embodiment, the optical film comprises 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 side of the optical film opposite to the adhesive layer.

[0019] Effects of the Invention

[0020] According to the embodiment of the present invention, it is possible to realize a method for transporting a film product in which the generation of scratches and stains is significantly suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic perspective view for explaining the cutting out of a film product used in the film product conveying method according to the embodiment of the present invention.

[0022] Figure 2 This is a schematic cross-sectional view for explaining a typical structure of an optical film as an example of a film product.

[0023] Figure 3 (a) to (c) are schematic cross-sectional views for explaining formation of a package body in a film product transport method according to one embodiment of the present invention.

[0024] Figure 4 Yes Figure 3 A perspective schematic diagram for explaining an outline of formation of a package body.

[0025] Figure 5 This is a schematic perspective view for explaining formation of a package body in a film product transport method according to another embodiment of the present invention.

[0026] Explanation of symbols

[0027] 10 Original film

[0028] 20 Membrane products

[0029] 21 Optical film

[0030] 22 Adhesive layer

[0031] 23 Diaphragm

[0032] 24 Surface protection film

[0033] 30The first packaging film

[0034] 311st base material

[0035] 32 1st adhesive layer

[0036] 40Second packaging film

[0037] 41 2nd base material

[0038] 42 2nd adhesive layer

[0039] 50 Bale intermediate

[0040] 100 bales DETAILED DESCRIPTION

[0041] Hereinafter, the 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, for easy understanding, all the drawings are schematically shown and are not figures that accurately depict actual states.

[0042] A. Overview of the method for transporting membrane products

[0043] A film product delivery method according to an embodiment of the present invention includes: cutting a film product of a given size from an original film; 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 laminating a plurality of the film products on the first adhesive layer of the first packaging film to form a packaging intermediate; and temporarily laminating the second packaging film to the packaging intermediate via the second adhesive layer in a manner covering the plurality of film products to form a packaging body. Each process is described in detail below.

[0044] B. Cutting out membrane products

[0045] First, if Figure 1 As shown, a film product 20 is cut out from an original film 10. The original film is typically in the form of a long strip, and in one embodiment is wound into a roll. In the illustrated example, the original film in a roll is continuously unwound and cut out while being transported. Cutting can be performed by any appropriate method. As specific examples of cutting, punching with a punching knife (e.g., a Thomson knife, a Pinnacle (registered trademark) knife), and cutting by laser irradiation can be cited.

[0046] As a film product, any appropriate film can be cited as long as it can be cut out from the original film and transported. As representative examples of film products, packaging films, optical films, agricultural films, food films, various industrial films, cosmetic films, and medical films can be cited. In one embodiment, the film product includes an optical film. In the case where the film product includes an optical film, the effect based on the embodiment of the present invention will become significant. For optical films, compared with film products for other purposes, significantly strict standards are required for scratches and dirt during transportation, but according to the embodiment of the present invention, not only can the generation of scratches and dirt during transportation of optical films be significantly suppressed, especially in the case where the film product is an optical film including a temporarily bonded diaphragm and a surface protective film, it is possible to prevent the adverse effects of the diaphragm and / or the surface protective film on the inspection of foreign matter during the manufacture of the image display device, etc. caused by the bad conditions of the diaphragm and / or the surface protective film.

[0047] Figure 2 This is a cross-sectional schematic diagram for explaining a representative structure of an optical film (film product). The film product 20 shown in the figure includes an optical film 21 and an adhesive layer 22, so that it can be bonded to an image display panel. In this case, typically, a separator 23 is temporarily bonded to the adhesive layer 22, and a surface protection film 24 is temporarily bonded to the side of the optical film 21 opposite to the adhesive layer 22. If it is such a structure, it is possible to more significantly suppress the generation of scratches and dirt when transporting the optical film.

[0048] The optical film 21 may be a film consisting of a single layer or a laminate. Specific examples of optical films consisting of a single layer include polarizers and phase difference films. Specific examples of optical films consisting of a laminate include polarizers (typically a laminate of a polarizer and a protective film), conductive films for touch panels, surface treatment films, and laminates formed by appropriately laminating these optical films consisting of a single layer and / or optical films consisting of a laminate according to the purpose (for example, circular polarizers for anti-reflection, polarizers with conductive layers for touch panels).

[0049] As the separator 23, any appropriate separator can be used. As a specific example, a plastic film, a non-woven fabric or a paper coated with a release agent can be cited. As a specific example of the release agent, a silicone release agent, a fluorine release agent, and a long-chain alkyl acrylate release agent can be cited. As a specific example of the plastic film, a cellulose resin film such as polyethylene terephthalate (PET) film, a polyethylene film, a polypropylene film, an acrylic resin film, a cycloolefin resin film, a triacetyl cellulose (TAC) film, and a polycarbonate resin film can be cited. The thickness of the separator can be, for example, 10 μm to 100 μm.

[0050] The surface protection film 24 typically has a substrate and an adhesive layer. As the forming material of the substrate, for example, 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 their copolymer resins can be cited. Preferably, ester resins (especially polyethylene terephthalate resins), cycloolefin resins, acrylic resins, TAC, polycarbonate resins. If it is such a material, it has the advantages that the elastic modulus is high enough and it is not easy to deform even if tension is applied during transportation and / or lamination. Hereinafter, the adhesive layer of the surface protection film is referred to as the PF adhesive layer.

[0051] The elastic modulus of the substrate can be, for example, 2.2 kN / mm 2 ~4.8kN / mm 2 If the elastic modulus of the substrate is within such a range, there is an advantage that deformation is not easily caused even when tension is applied during transportation and / or lamination. It should be noted that the elastic modulus can be measured based on JIS K 6781.

[0052] The thickness of the substrate may be, for example, 30 μm to 100 μm.

[0053] As the adhesive layer (PF adhesive layer), any appropriate structure can be adopted. As specific examples, acrylic adhesives, rubber adhesives, silicone adhesives, polyester adhesives, urethane adhesives, epoxy adhesives, and polyether adhesives can be cited. By adjusting the type, quantity, combination and ratio of the monomers forming the base resin of the adhesive, as well as the amount of the cross-linking agent, the reaction temperature, the reaction time, etc., an adhesive having the desired properties consistent with the purpose can be prepared. The base resin of the adhesive can be used alone or in combination of two or more. The adhesive constituting the PF adhesive layer has the characteristic that the base resin contains a polymer having an active hydrogen functional group. If it is such a base resin, a PF adhesive layer with a desired storage modulus can be obtained. The details of the adhesive constituting the PF adhesive layer are described in, for example, Japanese Patent Gazette No. 2018-123281, and the description of the gazette is cited as a reference in this specification. The thickness of the PF adhesive layer can be, for example, 10μm to 100μm. The storage modulus G' of the PF adhesive layer at 25°C can be, for example, 0.5×10 6 (Pa)~3.0×10 6 (Pa). When the storage elastic modulus is within such a range, a pressure-sensitive adhesive layer (and, as a result, a surface protective film) having an excellent balance between adhesiveness and releasability can be obtained.

[0054] The thickness of the surface protection film may be, for example, 40 μm to 150 μm. The thickness of the surface protection film refers to the total thickness of the substrate and the PF adhesive layer.

[0055] As the adhesive layer 22, a conventional structure well known in the art can be adopted.

[0056] The film product can be cut into any appropriate size according to the purpose. In the case where the film product includes an optical film, its size can be, for example, less than the size of a tablet computer (about 180 mm vertically and 250 mm horizontally), and can also be, for example, less than the size of a smart phone (about 75 mm vertically and 120 mm horizontally), and can also be, for example, a size for VR goggles (about 20 mm vertically and 30 mm horizontally). The smaller the size of the film product, the more significant the effect based on the embodiment of the present invention. For example, the size selection of the first packaging film and the second packaging film described later becomes easy.

[0057] C. Baling film

[0058] C-1. The first packaging film

[0059] The first packaging film typically has a size larger than that of the film product. The first packaging film may have a size capable of temporarily bonding, for example, 1 to 100, 1 to 10, 11 to 50, or 51 to 100 film products.

[0060] The first packaging film typically includes a first substrate and a first adhesive layer. In the embodiment of the present invention, the low-speed peeling force P of the first packaging film (substantially the first adhesive layer) with respect to the acrylic plate is 1L , high-speed peeling force P 1H , the thickness T1 of the first substrate preferably satisfies the following relationship.

[0061] P 1L ×T1≤13 and / or P 1H ×T1≤13

[0062] If P 1L ×T1 and / or P 1H ×T1 is within such a range, it is possible to effectively suppress peeling failure when the first packaging film is peeled off for use of the film product. In particular, when the film product is an optical film including a temporarily bonded diaphragm and a surface protective film, it is possible to suppress not only scratches and dirt on the optical film itself, but also lift and peeling of the diaphragm and / or the surface protective film when the first packaging film is peeled off. As a result, it is possible to prevent adverse effects on foreign matter inspection during the manufacture of an image display device caused by defects in the diaphragm and / or the surface protective film. In more detail, if P 1L ×T1 or P 1H By controlling any value of ×T1 to be within the above range, it is possible to significantly suppress the lifting and peeling of the separator and / or the surface protection film when the first packaging film is peeled off at a peeling speed corresponding to the purpose and situation. 1L ×T1 and P 1H By controlling both ×T1 to be within the above range, it is possible to significantly suppress the lifting and peeling of the separator and / or the surface protection film when peeling the first packaging film regardless of the peeling speed. 1L ×T1 is more preferably 10 or less, further preferably 7 or less, particularly preferably 5 or less, and particularly 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, further preferably 10 or less, particularly preferably 5 or less, and particularly preferably 1 or less. 1H The lower limit of ×T1 may be, for example, 0.3. The low-speed peel force refers to the peel force at a peeling speed of 0.3 m / min, and the high-speed peel force refers to the peel force at a peeling speed of 30 m / min. The peel force may be measured, for example, based on JIS Z 0237:2009.

[0063] The thickness of the first substrate can achieve the desired P 1L ×T1 and / or P 1H×T1, and any appropriate thickness can be adopted. The thickness of the first substrate can be, for example, 130 μm or less, or 100 μm or less, or 80 μm or less, or 50 μm or less, or 40 μm or less. The thickness of the first substrate can be, for example, 10 μm or more, or 20 μm or more. As the forming material of the first substrate, the forming materials described in item B for the substrate of the surface protection film can be cited.

[0064] The low-speed peeling force of the first adhesive layer with respect to the acrylic plate can achieve the above-mentioned desired P 1L ×T1, any appropriate peeling force can be used. The low-speed peeling force can be, for example, 0.30N / 25mm or less, or 0.25N / 25mm or less, or 0.20N / 25mm or less, or 0.15N / 25mm or less, or 0.10N / 25mm or less, or 0.08N / 25mm or less. The low-speed peeling force can be, for example, 0.03N / 25mm or more. The high-speed peeling force of the first adhesive layer relative to the acrylic plate can achieve the above-mentioned desired P 1H ×T1, any appropriate peeling force can be used. The high-speed peeling force can be, for example, 1.80N / 25mm or less, 1.00N / 25mm or less, 0.70N / 25mm or less, 0.50N / 25mm or less, or 0.35N / 25mm or less. The high-speed peeling force can be, for example, 0.01N / 25mm or more.

[0065] As the first adhesive layer, any adhesive layer may be used as long as the above-mentioned desired peeling force and the above-mentioned desired P are achieved. 1L ×T1 and / or P 1H ×T1, any appropriate structure can be adopted. As specific examples, there can be cited: 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, quantity, combination and ratio of the monomers forming the base resin of the adhesive, as well as the amount of the cross-linking agent, the reaction temperature, the reaction time, etc., an adhesive having desired properties consistent with the purpose can be prepared. The specific structure of the adhesive is described in, for example, Japanese Patent Gazette No. 2019-127526. In one embodiment, an acrylic adhesive can be used.

[0066] 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 alkyl (meth)acrylates having a linear or branched alkyl group with 1 to 20 carbon atoms. Specific examples include methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, tert-butyl (meth)acrylate, amyl (meth)acrylate, isoamyl (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, dodecyl (meth)acrylate, isotridecyl (meth)acrylate, tetradecyl (meth)acrylate, isotetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, octadecyl (meth)acrylate, isooctadecyl (meth)acrylate, nonadecyl (meth)acrylate, and aralkyl (meth)acrylates. In addition, (meth)acrylic acid means acrylic acid and / or methacrylic acid.

[0067] The (meth)acrylic acid alkyl ester 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.

[0068] The (meth)acrylic polymer preferably contains a monomer component having a crosslinkable functional group as a copolymer component. As monomers having a crosslinkable functional group, hydroxyl-containing monomers and carboxyl-containing monomers can be mentioned. As hydroxyl-containing monomers, for example, 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 can be mentioned. As carboxyl-containing monomers, for example, (meth)acrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid can be mentioned.

[0069] 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 copolymer components other than the above. In addition, as a modifying monomer, vinyl acetate, vinyl propionate, N-vinyl pyrrolidone, methyl vinyl pyrrolidone, vinyl pyridine, vinyl piperidone, vinyl pyrimidine, vinyl piperazine, vinyl pyrazine, vinyl pyrrole, vinyl imidazole, vinyl Vinyl monomers such as azoles, vinyl morpholine, N-vinyl carboxylic acid amides, styrene, α-methylstyrene, N-vinyl caprolactam, etc.; cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; epoxy-containing acrylic monomers such as glycidyl (meth)acrylate; diol acrylate monomers such as polyethylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, methoxypolypropylene glycol (meth)acrylate; acrylate monomers such as tetrahydrofurfuryl (meth)acrylate, fluoro(meth)acrylate, silicone (meth)acrylate, 2-methoxyethyl acrylate, etc.

[0070] The content of the copolymerization component in the (meth)acrylic polymer can be appropriately set according to the purpose. For example, when a hydroxyl-containing monomer and / or a carboxyl-containing monomer are used as the copolymerization component, the total content of the hydroxyl-containing monomer and the carboxyl-containing monomer can be preferably about 1% by weight to about 20% by weight, more preferably about 2% by weight to about 15% by weight, relative to the total amount of the monomer components.

[0071] 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, further preferably about 100,000 to 1,500,000, and particularly preferably about 200,000 to 1,000,000, in terms of polystyrene.

[0072] The acrylic adhesive may contain a crosslinking agent. Examples of the crosslinking agent include isocyanate crosslinking agents, epoxy crosslinking agents, Oxazoline crosslinking agent, aziridine crosslinking agent, carbodiimide crosslinking agent, metal chelate crosslinking agent. Among them, for the reason that the reactivity with the hydroxyl and carboxyl groups of acrylic polymers is high and the introduction of crosslinked structures is easy, isocyanate crosslinking agents and epoxy crosslinking agents are preferred. The crosslinking agent can be used alone or in combination. As specific examples of isocyanate crosslinking agents and epoxy crosslinking agents, the crosslinking agents described in Japanese Patent Publication No. 2019-127526 can be cited. Relative to 100 parts by weight of (meth) acrylic polymer, the amount of the crosslinking agent can be preferably 1.5 parts by weight or more, more preferably 2.0 parts by weight or more, and more preferably 2.5 parts by weight or more. If the amount of the crosslinking agent is such a range, appropriate peeling force can be achieved. On the other hand, relative to 100 parts by weight of (meth) acrylic polymer, the amount of the crosslinking agent can be preferably 20 parts by weight or less, more preferably 15 parts by weight or less, and more preferably 10 parts by weight or less. If the amount of the crosslinking agent is such a range, appropriate adhesion to the adherend can be achieved.

[0073] The acrylic adhesive may contain any appropriate additive. Specific examples of the additive include polymerization catalysts, crosslinking catalysts, silane coupling agents, tackifiers, plasticizers, softeners, anti-deterioration agents, fillers, colorants, ultraviolet light absorbers, antioxidants, surfactants, and antistatic agents. The type, quantity, combination, and amount of the additive may be appropriately set according to the purpose.

[0074] C-2. Second packaging film

[0075] 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. If it is such a structure, it is possible to prevent the first adhesive layer and / or the second adhesive layer from being exposed in the formed packaging body.

[0076] Low-speed peeling force P of the second packaging film (substantially the second adhesive layer) with respect to the acrylic plate 2L , high-speed peeling force P 2H , the thickness T2 of the second substrate preferably satisfies the following relationship.

[0077] P 2L ×T2≤13 and / or P 2H ×T2≤13

[0078] If P 2L ×T2 and / or P 2H×T2 is within such a range, it is possible to effectively suppress peeling failure when peeling off the second packaging film in order to use the film product. In particular, when the film product is an optical film including a temporarily bonded diaphragm and a surface protective film, it is possible to suppress not only scratches and dirt on the optical film itself, but also lift and peeling of the diaphragm and / or surface protective film when peeling off the second packaging film. As a result, it is possible to prevent adverse effects on foreign matter inspection during the manufacture of image display devices caused by defects in the diaphragm and / or surface protective film. In more detail, if P 2L ×T2 or P 2H By controlling any value of ×T2 to the above range, it is possible to significantly suppress the lifting and peeling of the separator and / or the surface protection film when the second packing film is peeled off at a peeling speed corresponding to the purpose and situation. 2L ×T2 and P 2H If both ×T2 are controlled within the above ranges, it is possible to significantly suppress the lifting and peeling of the separator and / or the surface protection film when the second packaging film is peeled, 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 force and high-speed peel force of the second adhesive layer, and the structure of the second adhesive layer are as described in the above section C-1 for the first packaging film. The second packaging film may be the same as the first packaging film or may have a different structure.

[0079] In one embodiment, the first packaging film and the second packaging film satisfy the following relationship.

[0080] P 1L ×T1≤13 and P 2L ×T2≤13; or

[0081] P 1H ×T1≤13 and P 2H ×T2≤13

[0082] With such a configuration, even when the first or second packaging film is peeled off from the package body at a peeling speed corresponding to the purpose and situation, the lifting and peeling of the separator and / or the surface protection film can be significantly suppressed. More preferably, the first packaging film and the second packaging film satisfy the following relationship.

[0083] P 1L ×T1≤13 and P 2L ×T2≤13; and

[0084] P 1H ×T1≤13 and P 2H ×T2≤13

[0085] According to such a configuration, regardless of the peeling speed, even when the first packaging film or the second packaging film is peeled from the package body, it is possible to significantly suppress the lifting and peeling of the separator and / or the surface protection film.

[0086] D. Formation of the bale intermediate

[0087] Below, refer to Figure 3 (a)~ Figure 3 (c) and Figure 4 The formation of the package intermediate and the package body is described. As an example, an optical film ( Figure 2 ) is used as a membrane product. First, Figure 3 As shown in (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 the above section C-1. Figure 3 As shown in (b), a plurality of film products 20 are temporarily bonded to the first adhesive layer 32 of the first packaging film 30 to form a packaging intermediate 50. The number of temporarily bonded film products 20 can be appropriately set according to the desired size of the film product and the size of the first packaging film. Since a large number of film products can be included in the packaging intermediate (ultimately the packaging body) when the size of the film product is small, the transportation efficiency can be improved. For the film product, the diaphragm can be arranged on the first packaging film side, and the surface protection film can also be arranged on the first packaging film side.

[0088] E. Formation of the bale body

[0089] Next, if Figure 3 (c) and Figure 4 As shown in FIG. 1 , the second packaging film 40 is temporarily bonded to the packaging intermediate 50 so as to cover the plurality of film products 20 temporarily bonded to the first packaging film 30, thereby forming a packaging body 100. The second packaging film 40 includes a second substrate 41 and a second adhesive layer 42, and is temporarily bonded to the film product 20 via the second adhesive layer 42. The second packaging film is as described in the above-mentioned section C-2. Here, if the first packaging film and the second packaging film have the same size, the exposure of the first adhesive layer 32 and / or the second adhesive layer 42 can be suppressed, and therefore, the adverse effect on transportation caused by the exposed adhesive layer can be suppressed.

[0090] The package body 100 obtained as described above is provided for transportation. According to an embodiment of the present invention, by providing such a package body for transportation, it is possible to significantly suppress the occurrence of scratches and dirt on the film product during transportation. In particular, in the case where an optical film to which a diaphragm and a surface protective film are temporarily bonded is transported as a film product, the diaphragm and the surface protective film can be used to significantly suppress the occurrence of scratches and dirt on the optical film itself during transportation, and the formation of a package body can significantly suppress the occurrence of scratches and dirt on the diaphragm and the surface protective film during transportation. As a result, for the optical film transported by the method of an embodiment of the present invention, the optical film itself will not be scratched or dirty, and the scratches and dirt on the diaphragm and / or the surface protective film will not have an adverse effect on foreign matter inspection during the manufacture of an image display device. Furthermore, by separating the P of the first package film and the second package film 1L ×T1,P 1H ×T1,P 2L ×T2 and / or P 2H By controlling ×T2 to fall within the above range, it is possible to significantly suppress warping and peeling of the separator and / or the surface protection film.

[0091] F. Modification

[0092] Figure 5 This is a three-dimensional schematic diagram for explaining the formation of a package body in a method for transporting a film product according to another embodiment of the present invention. As shown in the example in the figure, in this embodiment, only one long package film 30 including a substrate 31 and an adhesive layer 32 is used to form a roll-shaped package body. The following is an overview of this embodiment. Figure 5 As shown, while the packaging film 30 continuously unrolled from the roll is transported, the film product 20 is temporarily attached to the surface of the adhesive layer 32 to form a packaging intermediate. The packaging film (packaging intermediate) to which the film product is temporarily attached is continuously wound into a roll shape with the film product facing the inside from the formation of the packaging intermediate. Thus, a rolled packaging body is formed. By providing such a packaging body for transportation, the same effect as the effect described in the above-mentioned item E can be obtained.

[0093] In this embodiment, Figure 3 (a)~ Figure 3 (c) and Figure 4 In the same manner as in the embodiment shown, the low-speed peeling force P of the packaging film against the acrylic plate is L , high-speed peeling force P H , the thickness T of the substrate satisfies the following relationship.

[0094] P L ×T≤13 and / or P H ×T≤13

[0095] According to such a configuration, particularly when an optical film to which a separator and a surface protective film are temporarily bonded is transported as a film product, it is possible to significantly suppress warping and peeling of the separator and / or the surface protective film when peeling the packaging film.

[0096] Example

[0097] Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples.

[0098] <Production Examples 1 to 6: Packaging Films>

[0099] 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 the product names are as follows.

[0100] A: RP108C

[0101] B:RP109C

[0102] C: RP300C

[0103] D: RP149C

[0104] E: RP159JD

[0105] F:CP170U

[0106] [Table 1]

[0107]

[0108] <Example 1>

[0109] A polarizer (optical film) with an adhesive layer having a structure of cycloolefin (COP) protective film (47 μm) / polarizer (5 μm) / COP protective film (24 μm) / adhesive layer (20 μm) was prepared by a conventional method. A diaphragm (thickness 37 μm) was temporarily bonded to the adhesive layer surface of the polarizer with an adhesive layer, and a surface protective film was temporarily bonded to the surface of the COP protective film on the opposite side of the adhesive layer. It should be noted that as a surface protective film, a surface protective film having a structure of a PET substrate (50 μm) / PF adhesive layer (10 μm) was used. In this way, a laminate having a structure of a surface protective film / COP protective film / polarizer / COP protective film / adhesive layer / diaphragm was prepared. The obtained laminate was cut into a size of 20 mm in length and 30 mm in width to obtain a film product.

[0110] On the other hand, the packaging film A was cut into a size of 250 mm in length and 300 mm in width. The above-mentioned film product was placed and temporarily attached in 3 rows in length and 1 row in width on the adhesive layer surface of the cut packaging film A to form a packaging intermediate. At this time, the temporary attachment was performed in such a way that the separator became the packaging film A side. Next, the 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 in such a way as to cover the film product to form a packaging body. Two such packaging bodies were made, and they were stacked in such a way that the separator became the upper side, and were placed under normal conditions for 0.5 hours. The packaging film A was peeled off from the packaging body after being placed, and the state at this time was observed with the naked eye. The packaging film A was peeled off in two forms: (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. In addition, the peeling was performed twice for each form. The results are shown in Table 2.

[0111] <Examples 2 to 8>

[0112] A package body was formed in the same manner as in Example 1 except that a packaging film was temporarily bonded to each side of the film product as shown in Table 2. The obtained package body was subjected to the same evaluation as in Example 1. The results are shown in Table 2.

[0113] <Comparative Example 1>

[0114] The film products were directly laminated (that is, without temporarily sticking a packaging film), left to stand under the same conditions as in Example 1, and then subjected to the same evaluation as in Example 1. Table 2 shows the results.

[0115]

[0116] It should be noted that in Table 2, "SPV" means a surface protective film, and "separator" means a separator. In addition, "peeling" means that the surface protective film is completely peeled off, "peeling" means that the surface protective film is attached but a part of the outer edge is peeled off, and "warping" means that the outer edge of the surface protective film is attached but a part of the inner part is peeled off, for example, "large warping" means that the degree of warping is large. "Scars / scratches" means that scars and / or scratches have occurred.

[0117] Industrial Applicability

[0118] The transport 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 an optical film to which a separator and a surface protection film are temporarily bonded.

Claims

1. A method for transporting a membrane product, the method comprising: Cutting a film product of a given size from the original film; preparing a first packaging film having a size larger than that of the film product and comprising a first substrate and a first adhesive layer; preparing a second packaging film having a size larger than that of the film product and comprising a second substrate and a second adhesive layer; temporarily bonding a plurality of the film products to the first adhesive layer of the first packaging film to form a packaging intermediate; as well as The second packaging film is temporarily bonded to the packaging intermediate body via the second adhesive layer so as to cover the plurality of film products, thereby forming a packaging body.

2. The method for transporting a film product according to claim 1, wherein: The low-speed peeling force of the first packaging film with respect to the acrylic plate is defined as P 1L , high-speed peeling force is set as P 1H , the thickness of the first substrate is T1, and the low-speed peeling force of the second packaging film relative to the acrylic plate is P 2L , high-speed peeling force is set as P 2H , when the thickness of the second substrate is set to 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 peeling force refers to the peeling force at a peeling speed of 0.3 m / min, and the high-speed peeling force refers to the peeling force at a peeling speed of 30 m / min.

3. A method for transporting a membrane product, the method comprising: Cutting a film product of a given size from the original film; preparing a packaging film having a size larger than that of the film product and comprising a substrate and an adhesive layer; Temporarily attaching a plurality of the film products to the adhesive layer of the packaging film to form a packaging intermediate; as well as The package intermediate body is wound into a roll shape so that the plurality of film products are facing inside, thereby forming a package body.

4. The method for transporting a film product according to claim 3, wherein: The low-speed peeling force of the packaging film with respect to the acrylic plate is defined as P L , high-speed peeling force is set as P H , when the thickness of the substrate is set to T, the following relationship is satisfied: P L ×T≤13 or P H ×T≤13 Here, the low-speed peeling force refers to the peeling force at a peeling speed of 0.3 m / min, and the high-speed peeling force refers to the peeling force at a peeling speed of 30 m / min.

5. The method for conveying a film product according to any one of claims 1 to 4, wherein: The film article comprises an optical film.

6. 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 bonded to the pressure-sensitive adhesive layer side of the optical film, and a surface protection film is temporarily bonded to the side of the optical film opposite to the pressure-sensitive adhesive layer.

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