JP7309843B2 - Method for manufacturing optical film raw roll and method for manufacturing optical member sheet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing an optical film raw roll and a method for manufacturing an optical member sheet.

An optical film such as a polarizing plate is supplied with a protection film laminated on its surface (see Patent Document 1). For example, the polarizing plate is supplied in a state in which a film main body portion in which polarizer protective films are laminated on both sides of a polarizer film and a protection film is laminated on one surface of the film main body portion. The protection film is for preventing damage to one surface of the polarizing plate. The other surface is laminated with an adhesive layer and a separator sheet. The polarizer protective film is formed with a width wider than that of the polarizer film to ensure protection of the polarizer film. On the other hand, the protection film is arranged at least in a region of the polarizer protective film facing the polarizer film.

JP 2013-29754 A

The polarizing plate described above is manufactured, for example, by the following method. First, a strip-shaped protection film is laminated on one side of a strip-shaped film body, and the other side of the film body is subjected to surface treatment such as corona treatment or flame treatment. This surface treatment is performed in order to increase the adhesion between the film main body and the adhesive layer, and to facilitate the marking process on defective portions (such as foreign matter defects) of the film main body. Then, the surface-treated film main body part is temporarily wound into a roll together with the protection film, and transferred to the next step. Then, the film main body wound into a roll is unwound together with the protection film, an adhesive layer is formed on the other surface of the film main body, and a separator sheet is laminated on the adhesive layer.

In this method, the surface-treated film body is once wound together with the protection film. At this time, it is being studied to make the width of the protection film slightly narrower than the width of the main body of the film so that wrinkles do not occur at the ends of the protection film during winding. If the width of the protection film is wider than the width of the film body, when the protection film is wound, wrinkles will occur in the part that protrudes outside the film body, and the wrinkles will have an effect on the edge of the film body. This is because there is a risk that

However, when the width of the protection film is narrowed, the other surface of the film body that has undergone surface treatment may come into close contact with one surface of the film body on the outside of the protection film. If adhesion occurs, when the film body is unwound, peeling marks may occur in the adhesion part, or between the multiple layers constituting the film body (for example, between the polarizer film and the polarizer protective film). ) may peel off. This problem tends to occur frequently when polarizer protective films made of different materials are laminated on both sides of the polarizer film, or when one surface of the film body is subjected to hard coat treatment, corona treatment, or flame treatment. .

An object of the present invention is to provide an optical film, a raw fabric roll, and a method for producing an optical member sheet that can suppress the occurrence of peeling marks or the like on the edge of the optical film.

An optical film according to an aspect of the present invention includes a film main body and a protection film provided on the first surface of the film main body, wherein the protection film has a width greater than the width of the film main body. a first region located outside the protection film on one widthwise end side of the film main body, and the first region of the film main body; a second region that is a region on a second surface opposite to the region on one surface and that is a region that overlaps with the first region when the film main body is viewed in plan, and the first region At least one of the second regions is subjected to surface treatment such as corona treatment or flame treatment, and the width of the first region and the second region is 5 mm or more and 25 mm or less.

In the optical film according to one aspect of the present invention, the second region may be subjected to the surface treatment, and the first region may be subjected to hard coat treatment, corona treatment, or flame treatment.

In the optical film according to one aspect of the present invention, the film body includes a polarizer film, a first polarizer protective film provided on the first surface of the polarizer film, and the first polarizer protective film provided on the first surface of the polarizer film. a second polarizer protective film provided on a second side of the polarizer film opposite the one side.

In the optical film according to one aspect of the present invention, the surface of the first polarizer protective film opposite to the bonding surface with the polarizer film may be made of cellulose resin.

In the optical film according to one aspect of the present invention, the surface of the second polarizer protective film opposite to the surface bonded to the polarizer film may be composed of an olefin resin or a polystyrene resin.

In the optical film according to one aspect of the present invention, the second polarizer protective film may be a multilayer film composed of a plurality of films.

In the optical film according to one aspect of the present invention, when the width of the second region is ΔW and the thickness of the edge of the protection film facing the first region is _Tp , the _Tp and ΔW are T _p /ΔW≧4×10 ⁻³ can be satisfied.

In the optical film according to one aspect of the present invention, the thickness of the film main body in the surface-treated second region may be 10 μm or more and 200 μm or less.

A raw roll according to one aspect of the present invention is a raw roll of an optical film, wherein the optical film is the optical film according to one aspect of the present invention described above, and the optical film is the film body portion. and the second surface of the film body portion are wound in a roll while being in contact with each other on the outer side of the protection film.

A method for producing an optical member sheet according to one aspect of the present invention includes forming an adhesive layer on the second surface of the film body portion of the optical film according to one aspect of the present invention described above, and forming a separator on the adhesive layer. Sheets are laminated.

According to the present invention, it is possible to provide an optical film, a raw fabric roll, and a method for producing an optical member sheet that can suppress the occurrence of peeling marks and the like on the edge of the optical film.

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows schematic structure of the optical film of 1st embodiment. BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram and sectional drawing which show schematic structure of the original fabric roll of 1st embodiment. BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows schematic structure of the optical member sheet|seat of 1st embodiment. BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows schematic structure of the optical display component by which the sheet piece of the optical member sheet|seat of 1st embodiment was bonded together. Sectional drawing which shows schematic structure of the optical film of 2nd embodiment. The schematic diagram and sectional drawing which show schematic structure of the original fabric roll of 2nd embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments. In addition, in all the drawings below, the dimensions and ratios of the constituent elements are appropriately changed in order to make the drawings easier to see.

[First embodiment]
An optical film, an optical member sheet and a raw roll according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

FIG. 1 is a cross-sectional view showing a schematic configuration of an optical film 1 according to the first embodiment. The optical film 1 includes a film body portion F1a and a protection film F4a provided on the first surface Srf11 of the film body portion F1a. The optical film 1 is an intermediate product before manufacturing the optical member sheet 3 shown in FIG. That is, the optical film 1 is shipped as the optical member sheet 3 after forming the adhesive layer F2a on the second surface Srf12 of the film body portion F1a and laminating the separator sheet F3a on the adhesive layer F2a. The optical film 1 is temporarily wound into a roll and stored before laminating the adhesive layer F2a and the separator sheet F3a (see FIG. 2). When manufacturing an optical member sheet, the optical film 1 is unwound from the original fabric roll 2 and supplied.

The middle part of FIG. 2 is a schematic diagram of a raw fabric roll 2 formed by winding the optical film 1 into a roll. The lower part of FIG. 2 is a cross-sectional view showing the state of the optical film 1 being wound around the original roll 2 . The optical film 1 is wound up so that the protection film F4a faces the outer side of the original roll 2, as shown in the lower part of FIG. The upper part of FIG. 2 is a cross-sectional view showing the state of the optical film 1 wound around the original roll 2 . The optical film 1 is wound into a roll while the first surface Srf11 of the film body F1a and the second surface Srf12 of the film body F1a are in contact with each other outside the protection film F4a. The optical film 1 may be wound so that the film body F1a faces outward and the protection film F4a faces inward. In this case, the optical film 1 is wound into a roll while the first surface Srf11 and the second surface Srf12 of the film body F1a are in contact with each other inside the protection film F4a.

Various films such as a polarizing film, a retardation film, a brightness enhancement film, or a film in which two or more of these are selected and laminated can be used as the film main body portion F1a.

The film body portion F1a is, for example, a polarizing film in the present embodiment, and has the following configuration. As shown in FIG. 1, the film body portion F1a includes a polarizer film F6, a first polarizer protective film F8 provided on a first surface Srf61 of the polarizer film F6, and a first surface Srf61 of the polarizer film F6. a second polarizer protective film F7 provided on a second surface Srf62 of the polarizer film F6 opposite Srf61. The first polarizer protective film F8 and the second polarizer protective film F7 protect the polarizer film F6. In order to reliably protect the polarizer film F6, both the first polarizer protective film F8 and the second polarizer protective film F7 have a width sufficiently wider than the width of the polarizer film F6.

The polarizer film F6 transmits light having a plane of vibration in a certain direction and absorbs light having a plane of vibration perpendicular to this direction, and has the function of converting the incident light into linearly polarized light. have. The polarizer film F6 is produced by, for example, a process of uniaxially stretching a polyvinyl alcohol (PVA)-based resin film, a process of dyeing the polyvinyl alcohol-based resin film with a dichroic dye to adsorb the dichroic dye, and a dichroic It is produced through a step of treating a polyvinyl alcohol-based resin film to which a sexual dye is adsorbed with an aqueous boric acid solution, and a step of washing with water after the treatment with the aqueous boric acid solution.

The first polarizer protective film F8 is for protecting the polarizer film F6. Examples of materials for forming the first polarizer protective film F8 include triacetyl cellulose (TAC) resins, polyolefin resins including cyclic polyolefin resins and polypropylene resins, polystyrene resins, polycarbonate resins, and polyvinyl alcohol. system resins, (meth)acrylate-based resins, polyarylate-based resins, polyimide-based resins, polyamide-based resins, and the like.

In this embodiment, a triacetyl cellulose (TAC) resin is used as the material for forming the first polarizer protective film F8. Therefore, in the present embodiment, the surface of the first polarizer protective film F8 opposite to the bonding surface with the polarizer film F6 (the first surface Srf11 of the film body portion F1a) is made of cellulose resin. .

The second polarizer protective film F7 is for protecting the polarizer film F6. As a material for forming the second polarizer protective film F7, the same materials as those for the above-described first polarizer protective film F8 can be employed. For example, triacetyl cellulose (TAC)-based resin, polyolefin-based resin including cyclic polyolefin-based resin and polypropylene-based resin, polystyrene-based resin, polycarbonate-based resin, polyvinyl alcohol-based resin, (meth)acrylate-based resin, polyarylate-based resin , polyimide resins, polyamide resins, and the like.

In this embodiment, cycloolefin polymer (COP) or polystyrene is used as the material for forming the second polarizer protective film F7. Therefore, in the present embodiment, the surface of the second polarizer protective film F7 opposite to the bonding surface with the polarizer film F6 (the second surface Srf12 of the film main body portion F1a) is made of an olefin resin or a polystyrene resin. It is

The protection film F4a protects the first surface Srf11 of the film body F1a, and is provided detachably from the film body F1a. The protection film F4a is obtained by forming an adhesive/releasable resin layer such as an acrylic adhesive on a transparent resin film such as polyethylene terephthalate or polyethylene to provide weak adhesiveness.

The width of the protection film F4a is narrower than the width of the main film portion F1a in order to prevent the edges of the protection film F4a from being wrinkled when the optical film 1 is wound. The protection film F4a is laminated so as to be included inside the film body portion F1a when the optical film 1 is wound when viewed from the normal direction of the first surface Srf11. Therefore, on the first surface Srf11, there are a first exposed region (first region) Exp1 arranged outside the protection film F4a at one end in the width direction of the film body F1a, and the other end in the width direction of the film body F1a. There is a second exposed area (third area) Exp2 located outside the protection film F4a on the side. In addition, on the second surface Srf12, a first opposing region ( A second region) Cnt1 and a second opposing region (fourth region) Cnt2 exists. The width of the first area and the width of the second area are equal. The width of the third area and the width of the fourth area are equal.

The second surface Srf12 of the film body portion F1a is subjected to surface treatment such as corona treatment or flame treatment. Corona treatment is a treatment for generating polar groups such as carboxy groups and hydroxyl groups on the surface by performing corona discharge between an electrode and the surface of the film. Flame treatment is a treatment in which an oxidation reaction is caused on the surface of the film by a flame to generate polar groups on the surface.

Corona treatment or flame treatment is applied to the second surface Srf12 of the film body F1a in order to increase the adhesive force between the film body F1a and the adhesive layer F2a (see FIG. 3). As described above, in the optical film, first, the adhesive layer F2a is laminated on the surface of the film body F1a opposite to the surface on which the protection film F4a is laminated, and then the separator sheet F3a is laminated on the adhesive layer F2a. These are laminated to form an optical member sheet 3 (see FIG. 3). The optical member sheet 3 is wound into a roll and stored as a raw fabric roll 2 (see FIG. 2). The raw fabric roll 2 of the optical member sheet 3 is supplied to the manufacture of optical display devices.

In the manufacture of the optical display device, the optical member sheet 3 is cut together with the separator sheet F3a, and the sheet piece F11a (see FIG. 4(a)) having a size corresponding to the optical display part P (see FIG. 4(b)) is obtained. cut out. The optical display component P is, for example, a liquid crystal panel, and includes a first substrate P1, a second substrate P2 arranged to face the first substrate P1, and a and a liquid crystal layer P3. The separator sheet F3a is peeled off from the sheet piece F11a thus cut out, and bonded to the optical display component P on the adhesive layer F2a side (see FIG. 4(b)). Further, in the manufacture of optical display devices, in order to increase the yield of optical display devices, defects in the film main body portion F1a are detected, the detected defective portions are subjected to marking processing, and a sheet including the marked defective portions is The piece F11a may be sorted out and recovered without being attached to the optical display component P.

In order to perform peeling and lamination, the adhesion between the film body F1a and the adhesive layer F2a must be sufficiently high. In addition, in order to carry out the marking process, it is preferable to modify the surface of the film main body portion F1a to make it easier to print, and to facilitate the marking process on the defective portion. Therefore, corona treatment or flame treatment is performed in order to increase the adhesion between the film main body F1a and the adhesive layer F2a and to facilitate the marking process on the defective portion of the film main body F1a.

In this embodiment, since the adhesive layer F2a is laminated on the second surface Srf12 of the film main body portion F1a, the entire surface of the second surface Srf12 is subjected to corona treatment or flame treatment. Therefore, corona treatment or flame treatment is performed not only on the area facing the protection film F4a, but also on the area outside the area facing the protection film F4a (first facing area (second area) Cnt1 and second facing area (fourth Region) Cnt2) is also applied.

The first surface Srf11 of the film body portion F1a may be subjected to hard coat treatment, corona treatment, or flame treatment.

Hard coat treatment involves applying an active energy ray-curable resin composition to the surface to form a coating film, irradiating the coating film with an active energy ray to polymerize and cure it, and forming a curable resin layer (hard coat layer). The active energy ray-curable resin composition is a resin composition containing an active energy ray-curable resin that polymerizes and cures upon exposure to active energy rays, and a polymerization initiator that generates radicals upon exposure to active energy rays. is. The active energy ray-curable resin contains, for example, a polyfunctional (meth)acrylate compound. The polymerization initiator is a photopolymerization initiator that generates radicals upon exposure to active energy rays.

A hard coat treatment is performed to suppress scratches on the surface. In the hard coat treatment, the active energy ray-curable resin composition is mixed with fine particles that refract light and preferably give unevenness to the surface of the hard coat layer. It may also have an anti-glare function that diffuses external light and suppresses glare and glare.

In the present embodiment, the first surface Srf11 of the film main body portion F1a is the surface opposite to the bonding surface Srf12 with the optical display component P (surface exposed to the outside), so the entire surface of the first surface Srf11 Hard coat processing is applied. Therefore, the hard coat treatment is applied not only to the area where the protection film F4a is laminated, but also to the areas outside the protection film F4a (first exposed area (first area) Exp1 and second exposed area (third area) Exp2). is also applied.

Further, an optical member sheet may be formed by adhering other functional films such as a retardation film and a brightness enhancement film on the first surface Srf11 of the film body portion F1a. In this case, after peeling off the protection film F4a laminated on the film body portion F1a, the adhesive layer is laminated on the first surface Srf11, and the retardation film is laminated on the adhesive layer. Here, in order to laminate the adhesive layer on the first surface Srf11, the entire surface of the first surface Srf11 is subjected to corona treatment or flame treatment. Alternatively, the entire surface of the first surface Srf11 may be subjected to corona treatment or flame treatment in order to facilitate the marking process on the film main body portion F1a. In each of the above cases, corona treatment or flame treatment is applied not only to the region where the protection film F4a is laminated, but also to the regions outside the protection film F4a (the first exposed region Exp1 and the second exposed region Exp2). be.

As described above, the optical film 1 is temporarily wound into a roll and stored before laminating the adhesive layer F2a and the separator sheet F3a. At this time, if the width of the protection film F4a is too large, wrinkles are generated at the edge of the optical film 1 when the optical film 1 is wound up, and if the width of the protection film F4a is too small, the optical film 1 is wound up. When the first surface and the second surface of the film main body portion F1a are brought into close contact with each other, when the optical film is unwound in the next step, peeling marks may be generated in the adhered portions, or the plurality of films constituting the film main body portion F1a. The present inventors consider that problems such as peeling occur between layers (for example, between the polarizer film F6 and the second polarizer protective film F7 or the first polarizer protective film F8). is made clear by This problem can be solved by laminating the second polarizer protective film F7 and the first polarizer protective film F8 made of different materials on both sides of the polarizer film F6, or by applying hard coat treatment, corona treatment, or the like to one surface of the film body F1a. This is particularly noticeable when flame treatment is applied.

Therefore, in the optical film 1 of the present embodiment, the width ΔW of the first opposing region Cnt1 and the second opposing region Cnt2 subjected to surface treatment such as corona treatment or flame treatment is 5 mm or more and 25 mm or less. If ΔW is less than 5 mm, wrinkles are likely to occur at the edges of the optical film when the optical film is wound. If ΔW is larger than 25 mm, the first surface and the second surface of the film main body portion F1a are in close contact when the optical film is wound, and when the optical film is unwound in the next step, peeling marks are left in the close contact portion. Alternatively, peeling may occur between a plurality of layers constituting the film body F1a (for example, between the polarizer film and the polarizer protective film).

The preferred range of ΔW does not change greatly with the width of the optical film. In optical films used in direct-view optical display devices (smartphones, tablet terminals, large stationary home-use televisions, etc.) of several inches to several tens of inches, if ΔW is 5 mm or more and 25 mm or less, the above Problems are well contained.

In addition, the protection film F4a and the film body portion F1a are positioned and bonded so that the widths of the first exposed region Exp1 and the second exposed region Exp2 are equal. However, actually, there is a slight deviation in the bonding position between the protection film F4a and the film body portion F1a. Therefore, in the description of the present embodiment, for convenience, the width of the exposed region exposed to the outside of the protection film F4a on the first surface Srf11 of the film body F1a (the width of the film body F1a minus the width of the protection film F4a ) is defined as ΔL, and half the width of the exposed region is defined as the width ΔW of the first counter region Cnt1 and the second counter region Cnt2 (ΔW=ΔL/2).

For example, the present inventor has applied a plurality of optical films having different widths of the protection film F4a to the film body portion F1a such that both the first polarizer protective film F8 and the second polarizer protective film F7 have a width of 1330 mm. Created. Then, it is examined whether or not adhesion marks are generated at the end of the film main body portion F1a and wrinkles are generated at the end of the protection film F4a when the film is wound into the original roll state and then unwound again. bottom. As a result, the results shown in Table 1 were obtained.

As shown in Table 1, when ΔW is 5 mm or more and 25 mm or less, when the original film is wound into a roll and then unwound again, no adhesion mark is generated at the end of the film body F1a, and , no wrinkles are generated at the edge of the protection film F4a.

Problems of peel marks and delamination when the optical film is unwound are likely to occur when the thickness of the protection film F4a is thin. For example, if the thickness of the edge of the protection film F4a facing the first exposed region Exp1 or the second exposed region Exp2 is T _p (in the drawing, the Exp1 side is shown), T _p /ΔW<4×10 ⁻³ is satisfied. The above problems are likely to occur when The edge thickness Tp of the protection film F4a is usually 30 μm to 100 μm. Further, if the thickness of the film main body portion in the facing region subjected to the surface treatment is ΔD _p (in the figure, the Exp1 side is shown), when ΔD _p satisfies 10 μm≦ΔD _p ≦200 μm, the above-mentioned prone to problems. However, even in such a case, by setting the range of ΔW to 5 mm or more and 25 mm or less, the above problem can be sufficiently suppressed.

As described above, in the optical film 1 of the present embodiment, the range of ΔW is set to 5 mm or more and 25 mm or less. Therefore, when the optical film 1 is wound and stored, wrinkles may occur at the edges of the optical film 1, and the first surface and the second surface of the film main body F1a may be firmly adhered to each other outside the protection film F4a. Doing things such as doing things is suppressed. Since the adhesion between the films at the edges of the optical film 1 is suppressed, when the optical film 1 is unwound from the original roll 2, peeling marks are generated in the adhesion portion or the film body portion F1a is formed. It is possible to suppress the occurrence of peeling between a plurality of layers.

In addition, in the optical film 1 of the present embodiment, for the purpose of preventing the surface from being scratched, the first surface Srf11 may be hard-coated, or a sheet piece of another optical member sheet may be laminated. For this purpose, even if the first surface Srf 11 is corona-treated or flame-treated, the occurrence of the peeling marks and the peeling when the optical film 1 is unwound from the original roll 2 is suppressed. Therefore, the quality of the optical film 1 does not deteriorate, and each of the above objects can be achieved.

In addition, in the optical film 1 of the present embodiment, even if the film main body portion F1a is a polarizing film, it is possible to suppress the occurrence of the peeling marks and the peeling when the optical film 1 is unwound from the original roll 2. Therefore, the quality of the optical film 1 does not deteriorate, and the function of the polarizing film can be exhibited. Furthermore, even when the first polarizer protective film F8 is made of TAC and the second polarizer protective film F7 is made of COP or polystyrene, the quality of the optical film 1 is not degraded, and the object can be achieved. can be done.

Further, in the optical film 1 of the present embodiment, when the protection film F4a is thick such that the T _p and the ΔW satisfy T _p /ΔW≧4×10 ⁻³ , the optical film Since it is possible to suppress the occurrence of the peeling mark and the peeling when the optical film 1 is unwound from the original roll 2, the quality of the optical film 1 does not deteriorate, and the above object can be achieved.

In the optical film 1 of the present embodiment, the thickness of the film main body portion F1a in the first facing region Cnt1 or the second facing region Cnt2 subjected to the surface treatment is reduced for the purpose of making the optical display device thinner. Even when the thickness is 10 μm or more and 200 μm or less, the occurrence of peeling marks and peeling when the optical film 1 is unwound from the original roll 2 can be suppressed, so the quality of the optical film 1 does not deteriorate. The above object can be achieved without

[Second embodiment]
An optical film according to a second embodiment of the invention will be described with reference to FIGS. Hereinafter, the same reference numerals are given to the same components as in the first embodiment, and detailed description thereof will be omitted.

FIG. 5 is a cross-sectional view showing a schematic configuration of the optical film 5 according to the second embodiment. In the optical film 5, the second polarizer protective film F7 is a multi-layer film composed of multiple films. In this respect, it differs greatly from the first embodiment.

The second polarizer protective film F7 is composed of two layers, for example, a second polarizer protective layer F71 and a layer F72. Examples of the layer F72 include layers having various optical functions such as a retardation layer and a brightness enhancement layer. In this embodiment, layer F72 is a retardation layer.

The second polarizer protective layer F71 is for protecting the polarizer film F6. As a material for forming the second polarizer protective layer F71, materials such as TAC resin, COP, and polystyrene are used, like the first polarizer protective layer or the second polarizer protective layer in the first embodiment.

The retardation layer F72 has a function of emitting incident linearly polarized light as light of two types of polarization states. As a material for forming the retardation layer F72, a resin such as a TAC resin, COP, or polystyrene, which is excellent in transparency and capable of exhibiting an appropriate retardation value by stretching, is used. Further, the retardation layer F72 may be a wavelength plate such as a quarter wavelength plate or a half wavelength plate, or may be a viewing angle compensation film. In this embodiment, COP or polystyrene is used as the material for forming the retardation layer F72. Therefore, in the present embodiment, the surface of the second polarizer protective film F7 opposite to the bonding surface with the polarizer film F6 (the second surface Srf12 of the film main body portion F1a) is made of an olefin resin or a polystyrene resin. It is

6A and 6B are a schematic diagram and a cross-sectional view showing a schematic configuration of the raw fabric roll 6 formed by winding the optical film 5. FIG. Also in the raw fabric roll 6, since the regions arranged outside the protection film F4a are in close contact with each other on the first surface Srf11 and the second surface Srf12 of the film main body, the optical film 5 is wound. There is a problem that peeling marks are generated when the film is taken out. This problem occurs particularly when the materials of the first polarizer protective film F8 and the retardation layer F72 are different, or when one surface of the film main body portion F1a is subjected to hard coating treatment, corona treatment or flame treatment. Remarkable.

In the optical film 5 of the present embodiment as well, the above problem can be sufficiently suppressed by setting the width ΔW of the facing region to 5 mm or more and 25 mm or less.

As described above, in the raw fabric roll 6 of the present embodiment as well, the adhesion between the first polarizer protective film F8 and the second polarizer protective film F7 (retardation layer F72) is suppressed. As a result, when the film main body portion F1a is unwound from the original fabric roll 6, it is possible to prevent peeling marks from occurring in the adhered portions and peeling between the layers constituting the film main body portion F1a. , can be suppressed.

Although the preferred embodiments according to the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. The various shapes, combinations, etc., of the constituent members shown in the above examples are merely examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, the film body portion and the other end in the width direction of the protection film may coincide with each other. In this case, the second exposed area (third area) Exp2 and the second facing area (fourth area) Cnt2, which are arranged outside the protection film on the other widthwise end side of the film body portion, do not exist. In this case, the width ΔW of the surface-treated region is equal to ΔL obtained by subtracting the width of the protection film from the width of the film body (ΔW=ΔL).

1,5... optical film, 2,6... raw fabric roll, F1a... film body, F4a... protection film, F6... polarizer film, F7... second polarizer protective film, F8... first polarizer protective film, Srf11... First surface of film body Srf12... Second surface of film body Exp1... First exposed area (first area) Exp2... Second exposed area (third area) Cnt1... First opposing area (Second region), Cnt2... Second opposing region (fourth region)

Claims (9)

preparing an optical film;
and winding the optical film into a roll,
The optical film includes a film main body,
a protection film provided on the first surface of the film body,
The width of the protection film is narrower than the width of the film body,
a first region, which is a region on the first surface of the film body portion and is arranged outside the protection film on one width direction end side of the film body portion;
a second region, which is a region on the second surface opposite to the region on the first surface of the film body portion and overlaps with the first region when the film body portion is viewed in plan; including
At least one of the first surface and the second surface is subjected to surface treatment such as corona treatment or flame treatment,
The width of the first region and the second region is 10 mm or more and 25 mm or less,
In the winding step, the optical film is wound into a roll while the first surface of the film main body and the second surface of the film main body are in contact with each other on the outer side of the protection film.
A method for manufacturing an optical film raw roll. The second surface is subjected to the surface treatment,
2. The method for producing an optical film raw roll according to claim 1, wherein the first surface is subjected to hard coat treatment, corona treatment or flame treatment. The film main body is
a polarizer film;
a first polarizer protective film provided on the first surface of the polarizer film;
and a second polarizer protective film provided on the second surface of the polarizer film opposite to the first surface of the polarizer film. Method. 4. The method for manufacturing an optical film original roll according to claim 3, wherein the first polarizer protective film has a surface opposite to the surface bonded to the polarizer film made of cellulose resin. 5. The method for producing an optical film raw roll according to claim 3, wherein the second polarizer protective film has a surface opposite to the surface bonded to the polarizer film made of an olefin resin or a polystyrene resin. . The method for manufacturing an optical film original roll according to any one of claims 3 to 5, wherein the second polarizer protective film is a multilayer film composed of a plurality of films. The width of the first region and the second region is ΔW,
7. Any one of claims 1 to 6, wherein ΔW and T _p satisfy T _p /ΔW≧4×10 ⁻³ , where Tp is the thickness of the end portion of the protection film facing the first region. 10. A method for producing the optical film raw roll according to the above item. The method for manufacturing an optical film original roll according to any one of claims 1 to 7, wherein the thickness of the film body portion in the second region is 10 µm or more and 200 µm or less. An optical film is unwound from an optical film roll manufactured by the method for manufacturing an optical film roll according to any one of claims 1 to 8, and an adhesive layer is formed on the second surface of the film main body. and laminating a separator sheet on the adhesive layer.

Images