WO2016063668A1 - Polarizing plate roll - Google Patents

Polarizing plate roll Download PDF

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Publication number
WO2016063668A1
WO2016063668A1 PCT/JP2015/076632 JP2015076632W WO2016063668A1 WO 2016063668 A1 WO2016063668 A1 WO 2016063668A1 JP 2015076632 W JP2015076632 W JP 2015076632W WO 2016063668 A1 WO2016063668 A1 WO 2016063668A1
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WO
WIPO (PCT)
Prior art keywords
polarizing plate
core
convex portion
polarizer
film
Prior art date
Application number
PCT/JP2015/076632
Other languages
French (fr)
Japanese (ja)
Inventor
裕一 塩田
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020177013496A priority Critical patent/KR102291844B1/en
Priority to CN201580057075.6A priority patent/CN107076915B/en
Publication of WO2016063668A1 publication Critical patent/WO2016063668A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/04—Kinds or types
    • B65H75/08—Kinds or types of circular or polygonal cross-section
    • B65H75/10—Kinds or types of circular or polygonal cross-section without flanges, e.g. cop tubes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering

Definitions

  • the present invention relates to a polarizing plate roll formed by winding a long polarizing plate around a winding core.
  • the polarizing plate has been widely used in display devices such as liquid crystal display devices, especially in recent years for various mobile devices such as smartphones.
  • As a polarizing plate one having a configuration in which a protective film is bonded to one side or both sides of a polarizer is common, but with the development to mobile devices, the polarizer and protective film constituting the polarizing plate are made thinner. It is increasingly demanded.
  • the polarizing plate is manufactured by using a long (band-shaped) raw material film and processing the unwound raw material film while unwinding the raw material film from a roll in which the raw material film is wound around a winding core (winding core). It is common to use a so-called roll-to-roll method in which a long (band-like) polarizing plate is used, and the obtained polarizing plate is wound around a core to make a roll. Accordingly, the polarizing plate is usually obtained as a polarizing plate roll obtained by winding a long polarizing plate around a core (for example, Japanese Patent Application Laid-Open No. 2013-029754 (Patent Document 1)).
  • the polarizing plate is generally manufactured in the form of a polarizing plate roll.
  • the film length of the polarizing plate is 2000 m and the diameter of the core is 150 mm ⁇ , the number of windings of the polarizing plate reaches about 4000 times.
  • the polarizing plate manufactured as a polarizing plate roll is used for subsequent processes such as further laminating another film or forming a coating layer, or while being transported to a supply destination. It is often held in a roll for a certain continuous period.
  • the polarizing plate unwound after being held in a roll state for a certain continuous period has a problem that it is easily accompanied by deformation called “sagging” at both ends in the width direction. This problem becomes more prominent as the polarizer and the protective film constituting the polarizing plate are thinner. “Looseness” is wavy deformation (deflection) that occurs at both ends of the polarizing plate in the width direction. When this slackness is greatly spread from the end in the width direction to the inner side (center side) of the polarizing plate, the polarizing plate is used when another film is bonded or a coating layer is formed in the post-process. In other words, wrinkles are easily generated or bubbles are easily caught, resulting in a decrease in the quality of the product, and in some cases, it is difficult to perform the post-process itself.
  • the present invention is a polarizing plate roll formed by winding a polarizing plate around a winding core, which can be confirmed when the polarizing plate is unwound from the roll, and “sagging” occurring at both ends in the width direction of the polarizing plate. It aims at providing the polarizing plate roll which can suppress this.
  • the film thickness distribution of the polarizer contained in the polarizing plate is the main cause of slackness. That is, a polarizer is usually manufactured through a process of stretching a strip-shaped resin film or the like as a raw material in a longitudinal direction (film longitudinal direction) or a lateral direction (film width direction), so that both ends are compared with the central portion in the width direction. The thickness of the part is large. A polarizing plate provided with a polarizer having such a film thickness distribution also has a film thickness distribution having the same tendency. When the polarizing plate is wound around a winding core, the width direction end region of the stacked polarizing plates is reduced.
  • the polarizing plate Since the polarizing plate is further wound in the state where the overall thickness is increased, the circumferential stress is increased in both end regions of the wound polarizing plate, and the both end regions are stretched. It will be wound in a state. This is the main cause of slackness.
  • the present invention provides the following polarizing plate roll as means for solving the above problems.
  • a core including a first convex portion and a second convex portion extending in the circumferential direction on the outer peripheral surface, and a polarizing plate wound around the core,
  • the polarizing plate comprises a polarizer and a protective film laminated on at least one surface thereof, The polarizing plate is wound around the core so that one end in the width direction of the polarizer is positioned on the first convex portion and the other end is positioned on the second convex portion.
  • a polarizing plate roll.
  • a polarizing plate roll capable of suppressing slackening at both ends in the width direction of the polarizing plate. By suppressing the slack, it is possible to improve the quality of the polarizing plate itself and the product obtained by the post-process as described above, the yield of the product, and the ease of performing the post-process.
  • FIG. 1 shows the 1st convex part of the core with a convex part shown by FIG.
  • FIG. shows typically the positional relationship regarding the width direction between the convex part of the core with a convex part, and the polarizing plate wound.
  • FIG. 1 shows typically the positional relationship regarding the width direction between the convex part of the core with a convex part, and the polarizing plate wound.
  • FIG. 1 shows typically the positional relationship regarding the width direction between the convex part of the core with a convex part, and the polarizing plate wound.
  • FIG. 1 shows the positional relationship regarding the width direction between the convex part of the core with a convex part, and the polarizing plate wound.
  • FIG. 1 shows typically the positional relationship regarding the width direction between the convex part of the core with a convex part, and the polarizing plate wound.
  • FIG. 1 shows typically the positional relationship regarding the width direction between the convex part of the core with a convex
  • the polarizing plate roll according to the present invention has a convex winding having a first convex portion 10 a and a second convex portion 10 b extending in the circumferential direction as a winding core on the outer peripheral surface.
  • This is a roll-type polarizing plate in which a core 10 is used and a long polarizing plate is wound around the core 10.
  • the polarizing plate in order to suppress the occurrence of the above-mentioned “sag”, has one end in the width direction of the polarizer constituting the polarizing plate positioned on the first convex portion 10a and the other end.
  • the slack is suppressed by winding the polarizing plate in the above positional relationship, with respect to the width direction of the polarizing plate, both ends of the thickest polarizer are placed on the convex portion of the core 10 with the convex portion. This is because the above-described circumferential stress in the both end regions of the wound polarizing plate is relaxed.
  • the degree of slack (length) generally reaches the maximum when the number of turns from the beginning of winding is about 70 to 75 times (depending on the diameter of the core). However, in terms of the distance (winding length) from the winding start end, it is around 30 to 40 m). As the number of windings increases, the degree of looseness gradually decreases.
  • the degree of slack (length) here refers to the length of the wavy deformation extending from the width direction end of the polarizing plate to the inner side of the polarizing plate (center side).
  • the core 10 with convex part can have the same shape as a conventionally well-known core except having the 1st convex part 10a and the 2nd convex part 10b, These
  • the main body portion of the core excluding the convex portion can be, for example, a columnar shape or a cylindrical shape.
  • the material is not particularly limited, and a metal, an alloy, or a resin (such as a thermoplastic resin) can be used.
  • the length in the width direction (rotation axis direction) of the core 10 with the convex portion is approximately the same as or longer than the width of the polarizing plate to be wound.
  • the diameter may be a general diameter of the core, for example, about 100 to 200 mm ⁇ .
  • the installation position of the 1st convex part 10a and the 2nd convex part 10b provided in the outer peripheral surface of the core 10 with a convex part is dependent on the width
  • the first convex portion 10a and the second convex portion 10b are positions different from each other on the outer peripheral surface, and one end portion in the width direction of the polarizer constituting the polarizing plate is the first convex portion. It is located on the part 10a and installed so that the other end is located on the second convex part 10b.
  • the 1st convex part 10a and the 2nd convex part 10b are the edge part area
  • the 1st convex part 10a and the 2nd convex part 10b are provided in the outer peripheral surface of the core 10 with a convex part so that it may extend in the circumferential direction of the core 10 with a convex part, Preferably the circumference
  • the first convex portion 10 a and the second convex portion 10 b are preferably strip-shaped, and are provided in an annular shape over the entire circumference or approximately the entire circumference of the outer peripheral surface of the core 10 with the convex portion. It is preferable.
  • the 1st convex part 10a and the 2nd convex part 10b may be shape
  • the 1st convex part 10a and the 2nd convex part 10b are provided in the outer peripheral surface of the columnar or cylindrical core as a main-body part of the core 10 with a convex part.
  • the method of sticking the resin film to form (for example, a film tape from a thermoplastic resin) can be mentioned. This resin film may have an adhesive layer on one side for sticking to the outer peripheral surface of the core.
  • the method of sticking the resin film using an adhesive it is possible to reattach the film, so that the position adjustment or position change of the convex portion is facilitated.
  • the method of forming the convex portion by sticking the resin film is advantageous in terms of the manufacturing cost of the convex core 10 and the simplicity of manufacturing, and the convex core 10 having sufficient strength is provided. Obtainable.
  • the resin film may be attached to the outer peripheral surface of the core using an adhesive.
  • the polarizing plate wound around the convex core 10 includes a polarizer and a protective film laminated on at least one surface thereof.
  • the protective film may be laminated
  • the protective film is usually bonded to the polarizer via an adhesive layer.
  • an active energy ray-curable adhesive such as an ultraviolet curable adhesive or a water-based adhesive such as a polyvinyl alcohol resin aqueous solution can be used.
  • the total thickness of the polarizing plate is generally about 30 to 300 ⁇ m.
  • a uniaxially stretched resin film having a dichroic dye adsorbed and oriented can be suitably used.
  • An example of the resin film is a polyvinyl alcohol resin film.
  • the dichroic dye iodine or a dichroic dye can be used.
  • the polyvinyl alcohol resin constituting the polarizer a saponified polyvinyl acetate resin can be used.
  • the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith.
  • Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids and (meth) acrylamides having ammonium groups.
  • (meth) acryl means at least one selected from acryl and methacryl. The same applies to “(meth) acryloyl”.
  • the degree of saponification of the polyvinyl alcohol resin is usually about 85 to 100 mol%, preferably 98 mol% or more.
  • the polyvinyl alcohol resin may be modified, and for example, polyvinyl formal and polyvinyl acetal modified with aldehydes may be used.
  • the degree of polymerization of the polyvinyl alcohol resin is usually about 1000 to 10,000, and preferably about 1500 to 5,000.
  • the polarizer is a step of uniaxially stretching (typically, longitudinally uniaxially stretching in the longitudinal direction of the film) the original film made of the polyvinyl alcohol resin, and the polyvinyl alcohol resin film is dyed with a dichroic dye. It can be produced by a method including a step of adsorbing a chromatic dye, a step of treating a polyvinyl alcohol resin film adsorbed with a dichroic dye with a boric acid aqueous solution, and a step of washing with water after the treatment with the boric acid aqueous solution. You may provide the swelling process which performs the immersion process to water before a dyeing
  • the uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before, simultaneously with, or after the dyeing of the dichroic dye.
  • this uniaxial stretching may be performed before boric acid treatment or during boric acid treatment. Moreover, you may uniaxially stretch in these several steps.
  • the thickness (average thickness over the entire width) of the polarizer is, for example, 40 ⁇ m or less, preferably 25 ⁇ m or less. Particularly in a polarizing plate for mobile devices, it is more preferably 10 ⁇ m or less from the viewpoint of thinning the polarizing plate. preferable.
  • the thickness of the polarizer is usually 2 ⁇ m or more. Even when such a thin film polarizer is used, according to the present invention, it is possible to effectively suppress slack.
  • a polarizer is usually manufactured through a process of stretching a polyvinyl alcohol-based resin film in the longitudinal direction (film longitudinal direction), a film thickness distribution in which both end portions are thicker than the center portion in the width direction.
  • the polarizing plate also usually has the same thickness distribution.
  • the thickness of both end portions in the width direction of the polarizing plate can be about 1.01 to 1.2 times the thickness of the center portion in the width direction, about 1.04 to 1.2 times, and further 1.1 to 1 It may be about twice as large. Even if it has such a large film thickness difference, according to the present invention, it is possible to effectively suppress slack.
  • the protective film to be bonded to the polarizer is a light-transmitting (preferably optically transparent) thermoplastic resin such as a chain polyolefin resin (polypropylene resin, etc.), a cyclic polyolefin resin (norbornene-based).
  • Polyolefin resins such as resin); cellulose ester resins such as cellulose triacetate and cellulose diacetate; polyester resins; polycarbonate resins; (meth) acrylic resins; polystyrene resins; or a mixture or copolymer thereof. It can be a film made of an object or the like.
  • these may be protective films made of the same kind of resin or may be protective films made of different kinds of resins.
  • the protective film may be a protective film having both optical functions such as a retardation film and a brightness enhancement film.
  • a retardation film provided with an arbitrary retardation value by stretching a film made of the thermoplastic resin (uniaxial stretching or biaxial stretching) or by forming a liquid crystal layer or the like on the film. It can be.
  • chain polyolefin resin examples include a homopolymer of a chain olefin such as a polyethylene resin and a polypropylene resin, and a copolymer composed of two or more chain olefins.
  • Cyclic polyolefin-based resin is a general term for resins that are polymerized using cyclic olefins as polymerization units.
  • Specific examples of cyclic polyolefin resins include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins and chain olefins such as ethylene and propylene (typically Are random copolymers), graft polymers obtained by modifying them with unsaturated carboxylic acids or derivatives thereof, and hydrides thereof.
  • norbornene resins using norbornene monomers such as norbornene and polycyclic norbornene monomers as cyclic olefins are preferably used.
  • the cellulose ester resin is an ester of cellulose and a fatty acid.
  • Specific examples of the cellulose ester resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, and cellulose dipropionate.
  • these copolymers and those in which a part of the hydroxyl group is modified with other substituents can also be used.
  • cellulose triacetate triacetyl cellulose: TAC is particularly preferable.
  • the polyester-based resin is a resin other than the cellulose ester-based resin having an ester bond, and is generally made of a polycondensate of a polyvalent carboxylic acid or a derivative thereof and a polyhydric alcohol.
  • a dicarboxylic acid or a derivative thereof can be used, and examples thereof include terephthalic acid, isophthalic acid, dimethyl terephthalate, and dimethyl naphthalenedicarboxylate.
  • a diol can be used as the polyhydric alcohol, and examples thereof include ethylene glycol, propanediol, butanediol, neopentyl glycol, and cyclohexanedimethanol.
  • polyester resin examples include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexanedimethyl terephthalate, and polycyclohexanedimethyl naphthalate.
  • Polycarbonate resin is made of a polymer in which monomer units are bonded via a carbonate group.
  • the polycarbonate-based resin may be a resin called a modified polycarbonate having a modified polymer skeleton, a copolymer polycarbonate, or the like.
  • the (meth) acrylic resin is a resin containing a compound having a (meth) acryloyl group as a main constituent monomer.
  • Specific examples of the (meth) acrylic resin include, for example, poly (meth) acrylic acid esters such as polymethyl methacrylate; methyl methacrylate- (meth) acrylic acid copolymer; methyl methacrylate- (meth) acrylic acid Ester copolymer; methyl methacrylate-acrylate ester- (meth) acrylic acid copolymer; (meth) methyl acrylate-styrene copolymer (MS resin, etc.); methyl methacrylate and alicyclic hydrocarbon group And a copolymer with the compound (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate- (meth) acrylate norbornyl copolymer, etc.).
  • a polymer based on a poly (meth) acrylic acid C 1-6 alkyl ester such as poly (meth) acrylic acid methyl is used, and more preferably methyl methacrylate is used as a main component (50 to 100). % Methyl methacrylate-based resin is used.
  • the thickness of the protective film is preferably 90 ⁇ m or less, more preferably 50 ⁇ m or less, and even more preferably 30 ⁇ m or less, from the viewpoint of thinning the polarizing plate.
  • the thickness of the protective film is usually 5 ⁇ m or more from the viewpoint of strength and handleability. Even when such a thin protective film is used, according to the present invention, the slack can be effectively suppressed.
  • a protective film having a higher moisture permeability is used, the slack is likely to occur. This is considered to be because a film having a large moisture permeability is likely to change in dimensions.
  • a protective film / polarizer / TAC protective film made of TAC rather than a polarizing plate having a protective film / polarizer / TAC protective film made of a cyclic polyolefin resin or a (meth) acrylic resin, a protective film / polarizer / TAC protective film made of TAC.
  • the polarizing plate is more likely to sag. Therefore, the present invention is particularly advantageous when a polarizing plate including a protective film having a high moisture permeability such as TAC is handled.
  • the polarizing plate may include a film or layer other than the protective film.
  • films and layers other than the protective film include: an adhesive layer; a separate film that protects the outer surface of the adhesive layer (release film); a protective film that protects the surface of the protective film (surface protective film); Surface treatment layer (coating layer) for imparting functions; including various optical functional films.
  • a conventionally known appropriate pressure-sensitive adhesive can be used.
  • a (meth) acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, and a polyamide-based pressure-sensitive adhesive examples thereof include an adhesive, a polyether-based adhesive, a fluorine-based adhesive, and a rubber-based adhesive.
  • a (meth) acrylic pressure-sensitive adhesive is preferably used from the viewpoints of transparency, adhesive strength, reliability, reworkability, and the like.
  • the thickness of the pressure-sensitive adhesive layer can be generally 1 to 40 ⁇ m (for example, 3 to 25 ⁇ m).
  • the constituent material of the separate film can be a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate, and the like. Among these, a stretched film of polyethylene terephthalate is preferable.
  • constituent material of the protective film examples include polyethylene resins such as polyethylene, polypropylene resins such as polypropylene, and polyester resins such as polyethylene terephthalate. Among them, from the viewpoint of moisture permeability and mechanical strength A stretched film of polyethylene terephthalate is preferred.
  • Examples of the surface treatment layer include a hard coat layer, an antiglare layer, an antireflection layer, an antistatic layer, and an antifouling layer.
  • a reflective polarizing film that transmits a certain kind of polarized light and reflects polarized light that shows the opposite property
  • a film with an antiglare function having an uneven shape on the surface
  • a film with a surface antireflection function examples thereof include a reflective film having a reflective function on the surface; a transflective film having both a reflective function and a transmissive function; and a viewing angle compensation film.
  • the width of the polarizing plate wound around the convex core 10 is not particularly limited, but is usually about 300 to 2500 mm, and more typically about 500 to 2000 mm.
  • the length of the polarizing plate is not particularly limited, but is usually about several hundred m to 3000 m (for example, about 2000 m), and more typically about 1500 to 2500 m.
  • variety of the protective film bonded to this may be the same or different, the width
  • FIG. 3 shows the convex part of the core 10 with convex part and the polarizing plate 20 to be wound. It is sectional drawing which shows typically the positional relationship regarding the width direction between.
  • the polarizing plate 20 comprised from the polarizer 21 and the 1st protective film 22 bonded on the one surface and the 2nd protective film 23 bonded on the other surface is used as an example.
  • the layer configuration of the polarizing plate is not limited to this as described above.
  • FIG. 3 shows only the first convex portion 10a of the core 10 with convex portions, but the contents described below are similarly applied to the positional relationship with the second convex portion 10b.
  • the polarizing plate 20 has one end portion (end surface, T 1 in FIG. 3) in the width direction of the polarizer 21 located on the first convex portion 10a, which is not shown in FIG. However, it winds around the core 10 with a convex part so that the other edge part (end surface) may be located on the 2nd convex part 10b.
  • the end (end face) T 1 of the polarizer 21 is positioned on the first convex portion 10a. Referring to FIG. 3, the end T 1 of the polarizer 21 is the outer end T 2 of the first convex portion 10a. And the inner end T 3 (including the case where T 1 matches T 2 or T 3 ).
  • the end portion T 1 of the polarizer 21 is positioned outside the outer end portion (end surface) T 2 of the first convex portion 10a, or inside the inner end portion (end surface) T 3 of the first convex portion 10a. In the case of being positioned, it is not possible to sufficiently obtain a slack suppressing effect.
  • the end portion T 1 of the polarizer 21 is located outside the inner end portion T 3 of the first convex portion 10a.
  • the width W 2 (the overlapping width of the polarizer 21 and the first convex portion 10a) of the end region (region including the end portion T 1 ) of the polarizer 21 positioned (ridden) on the first convex portion 10a is as follows. 5 mm or more is preferable, and 10 mm or more is more preferable. Referring to FIG. 3, the overlap width W 2 corresponds to the distance from the end T 1 of the polarizer 21 to the inner end T 3 of the first convex portion 10a. If the overlap width W 2 is too small, it is difficult to obtain a sufficient slack suppressing effect.
  • the upper limit of the overlap width W 2 is not particularly limited, but can be about 30 mm, for example.
  • the width W 1 of the first convex portion 10a is preferably 5 mm or more so that the preferable overlapping width W 2 is obtained.
  • the upper limit of the width W 1 is not particularly limited, and is 100 mm, for example.
  • the position of the end T 1 of the polarizer 21 and the position of the outer end T 2 of the first convex portion 10a are matched or approximately matched (W 1 and W 2 are the same or approximately equal to each other). The same), and the end region of the polarizer 21 may be overlapped (mounted) over the entire width or almost the entire width of the first convex portion 10a.
  • the height H of the first convex portion 10a is preferably 50 ⁇ m or more, more preferably 120 ⁇ m or more, and 500 ⁇ m or more. More preferably it is. As the height H is larger, the slack suppression effect tends to be higher.
  • the upper limit of the height H can be 1500 ⁇ m (for example, 1000 ⁇ m).
  • FIG. Figure 4 is an example of forming a first convex portion 10a by superimposing winding the second resin film t 2 on the first resin film t 1.
  • the width of the protective film is made larger, and the protective film is generally pasted so that both ends in the width direction of the protective film are located outside the both ends in the width direction of the polarizer.
  • the protrusion width W 3 of the first protective film 22 and the second protective film 23 is: It can be about 1 to 100 mm (for example, about 5 to 60 mm).
  • the polarizing plate 20 is wound by rotating the winding core 10 with the convex portion around its rotation axis.
  • the fixing member 30 is used [FIG. 5 (a)]
  • the winding start end (longitudinal direction start end) of the polarizing plate 20 is provided with a convex portion. It is preferable to fix to the outer peripheral surface of the winding core 10 [FIG.5 (b)]. Since the polarizing plate 20 can be easily fixed, a double-sided tape can be preferably used as the fixing member 30.
  • a fixing member 30 that is a double-sided tape is attached to the outer peripheral surface of the core 10 with a convex portion parallel to the rotation axis of the core 10 with a convex portion, and the winding start end of the polarizing plate 20 is polarized on the fixing member 30. It sticks so that the short side direction of the board 20 may become parallel to the rotating shaft of the core 10 with a convex part.
  • winding streak defect means a difference in height generated between the winding start end and / or fixing member of the polarizing plate fixed on the fixing member and the outer peripheral surface of the core, that is, a step portion.
  • streak-like dent defect extending in the width direction of the polarizing plate, which is generated by pressing the wound polarizing plate.
  • a defect K 1 (defect generated by being pressed against the corner at the winding start end of the polarizing plate) derived from the corner at the winding start end of the polarizing plate (short side corner of the end), and
  • a defect K 2 (defect generated by being pressed against the corner of the fixing member) derived from the corner of the fixing member such as a double-sided tape (FIG. 6).
  • Winding streak defects are strongly generated in the polarizing plate inside the polarizing plate roll (initial polarizing plate at the start of winding), and become weaker toward the outer side of the polarizing plate roll. can occur over m.
  • a polarizing plate containing winding stripe defects is applied to an image display device such as a liquid crystal display device, the visibility may be lowered.
  • the polarizing plate roll according to the present invention is advantageous for suppressing such winding streak defects.
  • the smaller the height H of the convex portion the higher the effect of suppressing winding streak defects. Therefore, when it is desired to obtain a winding streak defect suppressing effect while obtaining a sufficient slack suppressing effect, the height H is preferably less than 500 ⁇ m, and preferably 400 ⁇ m or less. In order to obtain the effect of suppressing winding streak defects, the height H is preferably 50 ⁇ m or more (for example, 100 ⁇ m or more).
  • a long polarizing plate having a layer structure of a protective film [thickness 40 ⁇ m] / protective film [thickness 62 ⁇ m] made of an agent layer / TAC and a stretched polyethylene phthalate is continuously produced by a roll-to-roll method. Then, it was wound around a cylindrical core (no protrusion) to obtain a polarizing plate roll.
  • TAC triacetylcellulose
  • the specific conditions for producing the polarizing plate roll are as follows.
  • the winding start end (longitudinal direction start end) of the polarizing plate was fixed to the outer peripheral surface of the core using a double-sided tape having a thickness of 176 ⁇ m.
  • Cylindrical core (no protrusion) ⁇ Material: FRP (fiber reinforced plastic), ⁇ Width direction (rotating axis direction) length: 1480 mm, ⁇ Diameter: 167mm ⁇ , [2] Polarizing plate Width of protective film: 1330 mm, -Polarizer width: 1270 mm, - Figure 3 in W 3: 30 mm (both ends), -Polarizing plate length: about 2000m -Tension at the time of winding a polarizing plate: 250N.
  • Example 1 A polarizing plate roll was produced in the same manner as in Comparative Example 1 except that the same core with projections as in FIG. 1 was used and the specific conditions for producing the polarizing plate roll were as follows.
  • the polarizing plate was wound so that one end portion in the width direction of the polarizer was positioned on the first convex portion and the other end portion was positioned on the second convex portion.
  • the fixed-width resin film tape which has an adhesive layer on one side is stuck on the outer peripheral surface of a core main-body part over substantially the whole circumference like FIG. Formed by.
  • Example 2 A polarizing plate roll was produced in the same manner as in Example 1 except that the height of the first and second protrusions (H in FIG. 3) was 360 ⁇ m.
  • Example 3 A polarizing plate roll was produced in the same manner as in Example 1 except that the height of the first and second protrusions (H in FIG. 3) was 180 ⁇ m.
  • Example 4 A polarizing plate roll was produced in the same manner as in Example 1 except that the overlapping width (W 2 in FIG. 3) between the polarizer and the first and second convex portions was 2 mm.
  • Example 5 A polarizing plate roll was produced in the same manner as in Example 2 except that the first protective film was changed from the TAC film to a cyclic polyolefin resin (COP) film having a thickness of 20 ⁇ m.
  • COP cyclic polyolefin resin
  • ⁇ Comparative example 2> The overlapping width (W 2 in FIG. 3) between the polarizer and the first and second convex portions is 0 mm, that is, the end portion T 1 of the polarizer is the inner end portion T 3 of the first and second convex portions.
  • a polarizing plate roll was produced in the same manner as in Example 1 except that the polarizing plate was wound so as to be located on the inner side.
  • Table 1 summarizes the main production conditions for polarizing plate rolls in Examples 1 to 5 and Comparative Examples 1 and 2.
  • the produced polarizing plate roll was stored for 15 days in an environment of 25 ° C. and 50% RH, and then the following items were evaluated. The results are shown in Table 1.
  • the polarizing plate roll after the storage was unwound and the degree of slackness (length) was measured and evaluated according to the following criteria.
  • the degree of slack (length) is the length of slack (wave-like deformation) extending from the end of the polarizing plate in the width direction to the inside (center side) of the polarizing plate (more precisely, the protective film).
  • the degree of looseness was maximum at a point where the number of windings was 70 to 75 from the start of winding.
  • A The maximum value of the length of slack is less than 60 mm.
  • B The maximum value of the length of slack is 60 mm or more and less than 120 mm,
  • C The maximum value of the length of slack is 120 mm or more.
  • A The length by which a strong winding streak defect is observed visually is less than 10 m.
  • B The length at which a strong winding streak defect is observed visually is 10 m or more and less than 15 m.
  • C The length by which a strong winding streak defect is visually observed is 15 m or more.

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  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

Provided is a polarizing plate roll that includes: a winding core that has an outer circumferential surface that is provided with a first protrusion and a second protrusion that extend in the circumferential direction; and a polarizing plate that is wound around the winding core. The polarizing plate is provided with a polarizer and with a protective film that is laminated on at least one surface of the polarizer, and is wound around the winding core such that one width-direction end part of the polarizer is positioned above the first protrusion and the other end part is positioned above the second protrusion.

Description

偏光板ロールPolarizing plate roll
　本発明は、長尺の偏光板を巻芯に巻回してなる偏光板ロールに関する。 The present invention relates to a polarizing plate roll formed by winding a long polarizing plate around a winding core.
　偏光板は、液晶表示装置等の表示装置、とりわけ近年ではスマートフォンのような各種モバイル機器に広く用いられている。偏光板としては、偏光子の片面又は両面に保護フィルムを貼合した構成のものが一般的であるが、モバイル機器への展開に伴い、偏光板を構成する偏光子や保護フィルムの薄膜化が益々求められている。 The polarizing plate has been widely used in display devices such as liquid crystal display devices, especially in recent years for various mobile devices such as smartphones. As a polarizing plate, one having a configuration in which a protective film is bonded to one side or both sides of a polarizer is common, but with the development to mobile devices, the polarizer and protective film constituting the polarizing plate are made thinner. It is increasingly demanded.
　偏光板の製造は、長尺（帯状）の原料フィルムを用い、巻芯（巻付コア）に原料フィルムを巻き取ったロールから原料フィルムを巻き出しつつ、巻き出された原料フィルムに加工を施して長尺（帯状）の偏光板とし、得られた偏光板を巻芯に巻き取ってロールとする、いわゆるロール・トゥ・ロール方式で行われるのが一般的である。従って、偏光板は通常、長尺の偏光板を巻芯に巻き取った偏光板ロールとして得られる〔例えば特開２０１３－０２９７５４号公報（特許文献１）〕。 The polarizing plate is manufactured by using a long (band-shaped) raw material film and processing the unwound raw material film while unwinding the raw material film from a roll in which the raw material film is wound around a winding core (winding core). It is common to use a so-called roll-to-roll method in which a long (band-like) polarizing plate is used, and the obtained polarizing plate is wound around a core to make a roll. Accordingly, the polarizing plate is usually obtained as a polarizing plate roll obtained by winding a long polarizing plate around a core (for example, Japanese Patent Application Laid-Open No. 2013-029754 (Patent Document 1)).
特開２０１３－０２９７５４号公報JP 2013-029754 A
　上述のように偏光板は、偏光板ロールの形態で製造されるのが一般的である。例えば偏光板のフィルム長が２０００ｍであり、巻芯の直径が１５０ｍｍφである場合を例に挙げると、偏光板の巻回数は４０００回程度にも及ぶ。 As described above, the polarizing plate is generally manufactured in the form of a polarizing plate roll. For example, when the film length of the polarizing plate is 2000 m and the diameter of the core is 150 mmφ, the number of windings of the polarizing plate reaches about 4000 times.
　偏光板ロールとして製造された偏光板は、他のフィルムをさらに貼合したり塗工層を形成したりするなどの後工程に供されるまでの間、あるいは供給先へ輸送する間のようなある連続した期間、ロール状態で保持されることが多い。 The polarizing plate manufactured as a polarizing plate roll is used for subsequent processes such as further laminating another film or forming a coating layer, or while being transported to a supply destination. It is often held in a roll for a certain continuous period.
　しかしながら、ある連続した期間、ロール状態で保持された後に巻き出された偏光板は、その幅方向両端部に「弛み」と呼ぶ変形を伴いやすいという問題があった。この問題は、偏光板を構成する偏光子や保護フィルムが薄いほど顕著である。「弛み」とは、偏光板の幅方向両端部に生じる波打ち状の変形（撓み）である。この弛みが、幅方向端部から偏光板内側（中央部側）へ大きく広がって発生すると、上記後工程にて他のフィルムを貼合したり塗工層を形成したりするときに、偏光板にシワが発生したり気泡を噛み込みやすくなって、製品の品質低下を招いたり、場合によっては後工程の実施自体が困難になったりする。 However, the polarizing plate unwound after being held in a roll state for a certain continuous period has a problem that it is easily accompanied by deformation called “sagging” at both ends in the width direction. This problem becomes more prominent as the polarizer and the protective film constituting the polarizing plate are thinner. “Looseness” is wavy deformation (deflection) that occurs at both ends of the polarizing plate in the width direction. When this slackness is greatly spread from the end in the width direction to the inner side (center side) of the polarizing plate, the polarizing plate is used when another film is bonded or a coating layer is formed in the post-process. In other words, wrinkles are easily generated or bubbles are easily caught, resulting in a decrease in the quality of the product, and in some cases, it is difficult to perform the post-process itself.
　そこで本発明は、偏光板を巻芯に巻回してなる偏光板ロールであって、該ロールから偏光板を巻き出したときに確認し得る、偏光板の幅方向両端部に発生する「弛み」を抑制することができる偏光板ロールの提供を目的とする。 Therefore, the present invention is a polarizing plate roll formed by winding a polarizing plate around a winding core, which can be confirmed when the polarizing plate is unwound from the roll, and “sagging” occurring at both ends in the width direction of the polarizing plate. It aims at providing the polarizing plate roll which can suppress this.
　弛みについて追究したところ、偏光板に含まれる偏光子の膜厚分布が弛みの主な発生要因であることを見出した。すなわち、偏光子は通常、原料となる帯状の樹脂フィルム等を縦方向（フィルム長手方向）又は横方向（フィルム幅方向）に延伸する工程を経て製造されるため、幅方向中央部に比べて両端部の厚みが大きくなっている。かかる膜厚分布を有する偏光子を備えた偏光板も同じ傾向の膜厚分布を有しており、これを巻芯に巻回していくと、巻き重ねられた偏光板における幅方向両端部領域の全体厚みが高くなった状態のところに偏光板がさらに巻回されていくことになるため、巻回される偏光板の両端部領域において周方向応力が大きくなり、当該両端部領域が伸ばされた状態で巻回されることとなる。これが弛みの主な要因である。 Investigating about slackness, we found that the film thickness distribution of the polarizer contained in the polarizing plate is the main cause of slackness. That is, a polarizer is usually manufactured through a process of stretching a strip-shaped resin film or the like as a raw material in a longitudinal direction (film longitudinal direction) or a lateral direction (film width direction), so that both ends are compared with the central portion in the width direction. The thickness of the part is large. A polarizing plate provided with a polarizer having such a film thickness distribution also has a film thickness distribution having the same tendency. When the polarizing plate is wound around a winding core, the width direction end region of the stacked polarizing plates is reduced. Since the polarizing plate is further wound in the state where the overall thickness is increased, the circumferential stress is increased in both end regions of the wound polarizing plate, and the both end regions are stretched. It will be wound in a state. This is the main cause of slackness.
　以上の検討結果に基づき、上記課題の解決手段として本発明は、以下に示す偏光板ロールを提供する。 Based on the above examination results, the present invention provides the following polarizing plate roll as means for solving the above problems.
　［１］　周方向に延びる第１凸部及び第２凸部を外周面に備える巻芯と、前記巻芯に巻回される偏光板とを含み、
　前記偏光板は、偏光子とその少なくとも一方の面上に積層される保護フィルムとを備えるものであり、
　前記偏光板は、前記偏光子の幅方向における一方の端部が前記第１凸部上に位置し、他方の端部が前記第２凸部上に位置するように前記巻芯に巻回される、偏光板ロール。 [1] A core including a first convex portion and a second convex portion extending in the circumferential direction on the outer peripheral surface, and a polarizing plate wound around the core,
The polarizing plate comprises a polarizer and a protective film laminated on at least one surface thereof,
The polarizing plate is wound around the core so that one end in the width direction of the polarizer is positioned on the first convex portion and the other end is positioned on the second convex portion. A polarizing plate roll.
　［２］　前記第１凸部及び前記第２凸部上に位置する前記偏光子の端部領域の幅は、それぞれ５ｍｍ以上である、［１］に記載の偏光板ロール。 [2] The polarizing plate roll according to [1], wherein the widths of the end regions of the polarizer located on the first convex portion and the second convex portion are each 5 mm or more.
　［３］　前記第１凸部及び前記第２凸部の高さは、それぞれ５０μｍ以上である、［１］又は［２］に記載の偏光板ロール。 [3] The polarizing plate roll according to [1] or [2], wherein each of the first convex portion and the second convex portion has a height of 50 μm or more.
　［４］　前記第１凸部及び前記第２凸部は、前記外周面に貼着された樹脂フィルムで構成される、［１］～［３］のいずれかに記載の偏光板ロール。 [4] The polarizing plate roll according to any one of [1] to [3], wherein the first convex portion and the second convex portion are configured by a resin film adhered to the outer peripheral surface.
　［５］　前記偏光板の幅方向両端部の厚みは、幅方向中央部の厚みの１．０１～１．２倍である、［１］～［４］のいずれかに記載の偏光板ロール。 [5] The polarizing plate roll according to any one of [1] to [4], wherein the thickness of both end portions in the width direction of the polarizing plate is 1.01 to 1.2 times the thickness of the central portion in the width direction.
　本発明によれば、偏光板の幅方向両端部の弛みを抑制可能な偏光板ロールを提供することができる。弛みの抑制により、偏光板それ自体及び上述のような後工程によって得られる製品の品質や当該製品の収率を改善したり、後工程の実施容易性を高めたりすることができる。 According to the present invention, it is possible to provide a polarizing plate roll capable of suppressing slackening at both ends in the width direction of the polarizing plate. By suppressing the slack, it is possible to improve the quality of the polarizing plate itself and the product obtained by the post-process as described above, the yield of the product, and the ease of performing the post-process.
本発明に係る偏光板ロールに用いる凸部付き巻芯の一例を示す模式図である。It is a schematic diagram which shows an example of the core with a convex part used for the polarizing plate roll which concerns on this invention. 図１に示される凸部付き巻芯の第１凸部を有する部分における断面図である。It is sectional drawing in the part which has the 1st convex part of the core with a convex part shown by FIG. 凸部付き巻芯の凸部と巻回される偏光板との間の幅方向に関する位置関係を模式的に示す断面図である。It is sectional drawing which shows typically the positional relationship regarding the width direction between the convex part of the core with a convex part, and the polarizing plate wound. 凸部付き巻芯の他の一例を示す断面図である。It is sectional drawing which shows another example of the core with a convex part. 偏光板の巻き始め端部を、固定部材を用いて凸部付き巻芯に固定する様子を示す概略図である。It is the schematic which shows a mode that the winding start end part of a polarizing plate is fixed to a core with a convex part using a fixing member. 巻きスジ欠陥を説明するための概略図である。It is the schematic for demonstrating a winding stripe defect.
　本発明に係る偏光板ロールは、図１及び図２にその一例を示すように、巻芯として、周方向に延びる第１凸部１０ａ及び第２凸部１０ｂを外周面に備える凸部付き巻芯１０を用い、これに長尺の偏光板を巻回してなるロール形態の偏光板である。本発明では上述の「弛み」の発生を抑制するために、偏光板は、これを構成する偏光子の幅方向における一方の端部が第１凸部１０ａ上に位置し、他方の端部が第２凸部１０ｂ上に位置するように凸部付き巻芯１０に巻回される。凸部付き巻芯１０の凸部１０ａ，１０ｂと巻回される偏光板との間の幅方向に関する位置関係については、下記（３）の項で詳細に説明する。 As shown in FIG. 1 and FIG. 2, the polarizing plate roll according to the present invention has a convex winding having a first convex portion 10 a and a second convex portion 10 b extending in the circumferential direction as a winding core on the outer peripheral surface. This is a roll-type polarizing plate in which a core 10 is used and a long polarizing plate is wound around the core 10. In the present invention, in order to suppress the occurrence of the above-mentioned “sag”, the polarizing plate has one end in the width direction of the polarizer constituting the polarizing plate positioned on the first convex portion 10a and the other end. It winds around the core 10 with a convex part so that it may be located on the 2nd convex part 10b. The positional relationship in the width direction between the convex portions 10a and 10b of the core with convex portion 10 and the polarizing plate to be wound will be described in detail in the section (3) below.
　上記のような位置関係で偏光板を巻回することで弛みが抑制されるのは、偏光板の幅方向に関し、最も厚みの大きい偏光子の両端部を凸部付き巻芯１０の凸部上に置くことで、巻回される偏光板両端部領域における上述の周方向応力が緩和されるためと考えられる。なお、下記比較例１のとおり、概して、弛みの程度（長さ）が極大に達するのは、巻き始めからの巻回数でいえば、およそ７０～７５回の地点（巻芯の直径にもよるが、巻き始め端部からの距離（巻き長さ）でいえば、３０～４０ｍ付近）であり、これより巻回数が多くなると、徐々にではあるが、弛みの程度は減少していく。ここでいう弛みの程度（長さ）とは、波打ち状の変形が偏光板の幅方向端部から偏光板内側（中央部側）へ延びている長さをいう。 The slack is suppressed by winding the polarizing plate in the above positional relationship, with respect to the width direction of the polarizing plate, both ends of the thickest polarizer are placed on the convex portion of the core 10 with the convex portion. This is because the above-described circumferential stress in the both end regions of the wound polarizing plate is relaxed. As in Comparative Example 1 below, the degree of slack (length) generally reaches the maximum when the number of turns from the beginning of winding is about 70 to 75 times (depending on the diameter of the core). However, in terms of the distance (winding length) from the winding start end, it is around 30 to 40 m). As the number of windings increases, the degree of looseness gradually decreases. The degree of slack (length) here refers to the length of the wavy deformation extending from the width direction end of the polarizing plate to the inner side of the polarizing plate (center side).
　（１）凸部付き巻芯
　凸部付き巻芯１０は、第１凸部１０ａ及び第２凸部１０ｂを有すること以外は、従来公知の巻芯と同様の形状を有することができ、これらの凸部を除く巻芯の本体部分は、例えば円柱状又は円筒状であることができる。材質も特に制限はなく、金属、合金、樹脂（熱可塑性樹脂等）を用いることができる。凸部付き巻芯１０の幅方向（回転軸方向）の長さは、巻回される偏光板の幅と同程度か、又はそれより長い。凸部付き巻芯１０が円柱状又は円筒状である場合においてその直径は、巻芯の一般的な直径であってよく、例えば１００～２００ｍｍφ程度である。 (1) Core with convex part The core 10 with convex part can have the same shape as a conventionally well-known core except having the 1st convex part 10a and the 2nd convex part 10b, These The main body portion of the core excluding the convex portion can be, for example, a columnar shape or a cylindrical shape. The material is not particularly limited, and a metal, an alloy, or a resin (such as a thermoplastic resin) can be used. The length in the width direction (rotation axis direction) of the core 10 with the convex portion is approximately the same as or longer than the width of the polarizing plate to be wound. When the convex core 10 with a convex portion is a columnar shape or a cylindrical shape, the diameter may be a general diameter of the core, for example, about 100 to 200 mmφ.
　凸部付き巻芯１０の外周面に設けられる第１凸部１０ａ及び第２凸部１０ｂの設置位置は、巻回される偏光板の幅に依存する。具体的には、第１凸部１０ａ及び第２凸部１０ｂは、上記外周面において互いに異なる位置であって、かつ、偏光板を構成する偏光子の幅方向における一方の端部が第１凸部１０ａ上に位置し、他方の端部が第２凸部１０ｂ上に位置するように設置される。図１に示されるように、第１凸部１０ａ及び第２凸部１０ｂは通常、凸部付き巻芯１０の幅方向（回転軸方向）の端部領域（端部を含む。）又は端部寄りに設けられる。 The installation position of the 1st convex part 10a and the 2nd convex part 10b provided in the outer peripheral surface of the core 10 with a convex part is dependent on the width | variety of the polarizing plate wound. Specifically, the first convex portion 10a and the second convex portion 10b are positions different from each other on the outer peripheral surface, and one end portion in the width direction of the polarizer constituting the polarizing plate is the first convex portion. It is located on the part 10a and installed so that the other end is located on the second convex part 10b. As FIG. 1 shows, the 1st convex part 10a and the 2nd convex part 10b are the edge part area | region (an edge part is included) or edge part of the width direction (rotating-axis direction) of the core 10 with a convex part normally. It is provided near.
　第１凸部１０ａ及び第２凸部１０ｂは、凸部付き巻芯１０の外周面において、凸部付き巻芯１０の周方向に延びるように設けられ、好ましくは凸部付き巻芯１０の周方向に対して平行に（凸部付き巻芯１０の回転軸方向に対して垂直方向）に延びる。図２に示されるように第１凸部１０ａ及び第２凸部１０ｂは、帯状であることが好ましく、かつ、凸部付き巻芯１０の外周面における全周又はおよそ全周にわたって環状に設けられることが好ましい。 The 1st convex part 10a and the 2nd convex part 10b are provided in the outer peripheral surface of the core 10 with a convex part so that it may extend in the circumferential direction of the core 10 with a convex part, Preferably the circumference | surroundings of the core 10 with a convex part are provided. It extends in parallel to the direction (perpendicular to the rotational axis direction of the core 10 with protrusions). As shown in FIG. 2, the first convex portion 10 a and the second convex portion 10 b are preferably strip-shaped, and are provided in an annular shape over the entire circumference or approximately the entire circumference of the outer peripheral surface of the core 10 with the convex portion. It is preferable.
　第１凸部１０ａ及び第２凸部１０ｂは、凸部付き巻芯１０の本体部分と一体的に成形されていてもよいし、該本体部分とは異なる別部材を用いて形成されていてもよい。別部材を用いて凸部を形成する方法としては、凸部付き巻芯１０の本体部分としての円柱状又は円筒状の巻芯の外周面に、第１凸部１０ａ及び第２凸部１０ｂを形成する樹脂フィルム（例えば熱可塑性樹脂からフィルムテープ）を貼着する方法を挙げることができる。この樹脂フィルムは、巻芯の外周面への貼着のために、片面に粘着剤層を有するものであってもよい。樹脂フィルムを粘着剤を用いて貼着する方法によれば、貼り直しが可能になるため、凸部の位置調整又は位置変更が容易となる。樹脂フィルムの貼着によって凸部を形成する方法は、凸部付き巻芯１０の製造コスト面及び製造の簡便性の面でも有利であり、また、十分な強度を有する凸部付き巻芯１０を得ることができる。樹脂フィルムは、接着剤を用いて巻芯の外周面に貼着されてもよい。 The 1st convex part 10a and the 2nd convex part 10b may be shape | molded integrally with the main-body part of the core 10 with a convex part, or may be formed using another member different from this main-body part. Good. As a method of forming a convex part using another member, the 1st convex part 10a and the 2nd convex part 10b are provided in the outer peripheral surface of the columnar or cylindrical core as a main-body part of the core 10 with a convex part. The method of sticking the resin film to form (for example, a film tape from a thermoplastic resin) can be mentioned. This resin film may have an adhesive layer on one side for sticking to the outer peripheral surface of the core. According to the method of sticking the resin film using an adhesive, it is possible to reattach the film, so that the position adjustment or position change of the convex portion is facilitated. The method of forming the convex portion by sticking the resin film is advantageous in terms of the manufacturing cost of the convex core 10 and the simplicity of manufacturing, and the convex core 10 having sufficient strength is provided. Obtainable. The resin film may be attached to the outer peripheral surface of the core using an adhesive.
　（２）偏光板
　凸部付き巻芯１０に巻回される偏光板は、偏光子とその少なくとも一方の面上に積層される保護フィルムとを備えるものである。偏光子の両面に保護フィルムが積層されていてもよい。保護フィルムは通常、接着剤層を介して偏光子に貼合される。接着剤としては、紫外線硬化性接着剤のような活性エネルギー線硬化性接着剤や、ポリビニルアルコール系樹脂水溶液のような水系接着剤を用いることができる。偏光板の全体厚みは、一般に３０～３００μｍ程度である。 (2) Polarizing plate The polarizing plate wound around the convex core 10 includes a polarizer and a protective film laminated on at least one surface thereof. The protective film may be laminated | stacked on both surfaces of the polarizer. The protective film is usually bonded to the polarizer via an adhesive layer. As the adhesive, an active energy ray-curable adhesive such as an ultraviolet curable adhesive or a water-based adhesive such as a polyvinyl alcohol resin aqueous solution can be used. The total thickness of the polarizing plate is generally about 30 to 300 μm.
　偏光子としては、一軸延伸された樹脂フィルムに二色性色素が吸着配向されたものを好適に用いることができる。樹脂フィルムとしては、ポリビニルアルコール系樹脂フィルムが挙げられる。二色性色素としては、ヨウ素又は二色性染料を用いることができる。偏光子を構成するポリビニルアルコール系樹脂としては、ポリ酢酸ビニル系樹脂をケン化したものを用いることができる。ポリ酢酸ビニル系樹脂としては、酢酸ビニルの単独重合体であるポリ酢酸ビニルのほか、酢酸ビニルとこれに共重合可能な他の単量体との共重合体が例示される。酢酸ビニルに共重合可能な他の単量体の例は、不飽和カルボン酸類、オレフィン類、ビニルエーテル類、不飽和スルホン酸類及びアンモニウム基を有する（メタ）アクリルアミド類を含む。本明細書において「（メタ）アクリル」とは、アクリル及びメタクリルから選択される少なくとも一方を意味する。「（メタ）アクリロイル」についても同様である。 As the polarizer, a uniaxially stretched resin film having a dichroic dye adsorbed and oriented can be suitably used. An example of the resin film is a polyvinyl alcohol resin film. As the dichroic dye, iodine or a dichroic dye can be used. As the polyvinyl alcohol resin constituting the polarizer, a saponified polyvinyl acetate resin can be used. Examples of the polyvinyl acetate-based resin include polyvinyl acetate, which is a homopolymer of vinyl acetate, and copolymers of vinyl acetate and other monomers copolymerizable therewith. Examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids and (meth) acrylamides having ammonium groups. In the present specification, “(meth) acryl” means at least one selected from acryl and methacryl. The same applies to “(meth) acryloyl”.
　ポリビニルアルコール系樹脂のケン化度は通常、８５～１００ｍｏｌ％程度であり、９８ｍｏｌ％以上が好ましい。ポリビニルアルコール系樹脂は変性されていてもよく、例えば、アルデヒド類で変性されたポリビニルホルマール及びポリビニルアセタール等を用いることもできる。ポリビニルアルコール系樹脂の重合度は通常、１０００～１００００程度であり、１５００～５０００程度が好ましい。 The degree of saponification of the polyvinyl alcohol resin is usually about 85 to 100 mol%, preferably 98 mol% or more. The polyvinyl alcohol resin may be modified, and for example, polyvinyl formal and polyvinyl acetal modified with aldehydes may be used. The degree of polymerization of the polyvinyl alcohol resin is usually about 1000 to 10,000, and preferably about 1500 to 5,000.
　偏光子は、上記ポリビニルアルコール系樹脂からなる原反フィルムを一軸延伸（典型的にはフィルム長手方向への縦一軸延伸）する工程、ポリビニルアルコール系樹脂フィルムを二色性色素で染色してその二色性色素を吸着させる工程、二色性色素が吸着されたポリビニルアルコール系樹脂フィルムをホウ酸水溶液で処理する工程、及びホウ酸水溶液による処理後に水洗する工程を含む方法によって製造することができる。染色処理の前に水への浸漬処理を施す膨潤工程を設けてもよい。 The polarizer is a step of uniaxially stretching (typically, longitudinally uniaxially stretching in the longitudinal direction of the film) the original film made of the polyvinyl alcohol resin, and the polyvinyl alcohol resin film is dyed with a dichroic dye. It can be produced by a method including a step of adsorbing a chromatic dye, a step of treating a polyvinyl alcohol resin film adsorbed with a dichroic dye with a boric acid aqueous solution, and a step of washing with water after the treatment with the boric acid aqueous solution. You may provide the swelling process which performs the immersion process to water before a dyeing | staining process.
　ポリビニルアルコール系樹脂フィルムの一軸延伸は、二色性色素の染色前、染色と同時、又は染色の後に行うことができる。一軸延伸を染色の後で行う場合、この一軸延伸は、ホウ酸処理の前又はホウ酸処理中に行ってもよい。また、これらの複数の段階で一軸延伸を行ってもよい。 The uniaxial stretching of the polyvinyl alcohol-based resin film can be performed before, simultaneously with, or after the dyeing of the dichroic dye. When uniaxial stretching is performed after dyeing, this uniaxial stretching may be performed before boric acid treatment or during boric acid treatment. Moreover, you may uniaxially stretch in these several steps.
　偏光子の厚み（全幅における平均厚み）は、例えば４０μｍ以下であり、好ましくは２５μｍ以下であり、とりわけモバイル機器用の偏光板においては、偏光板の薄型化の観点から１０μｍ以下であることがより好ましい。偏光子の厚みは通常、２μｍ以上である。このような薄膜の偏光子を用いる場合であっても、本発明によれば、弛みを効果的に抑制することができる。 The thickness (average thickness over the entire width) of the polarizer is, for example, 40 μm or less, preferably 25 μm or less. Particularly in a polarizing plate for mobile devices, it is more preferably 10 μm or less from the viewpoint of thinning the polarizing plate. preferable. The thickness of the polarizer is usually 2 μm or more. Even when such a thin film polarizer is used, according to the present invention, it is possible to effectively suppress slack.
　上述のように、偏光子は通常、ポリビニルアルコール系樹脂フィルムを縦方向（フィルム長手方向）に延伸する工程を経て製造されるため、幅方向中央部に比べて両端部の厚みが大きい膜厚分布を有する。これに伴って偏光板もまた、同じ傾向の膜厚分布を有するのが通常である。偏光板の幅方向両端部の厚みは、幅方向中央部の厚みの１．０１～１．２倍程度であることができ、１．０４～１．２倍程度、さらには１．１～１．２倍程度大きくてもよい。このような大きい膜厚差を有する場合であっても、本発明によれば、弛みを効果的に抑制することができる。 As described above, since a polarizer is usually manufactured through a process of stretching a polyvinyl alcohol-based resin film in the longitudinal direction (film longitudinal direction), a film thickness distribution in which both end portions are thicker than the center portion in the width direction. Have Along with this, the polarizing plate also usually has the same thickness distribution. The thickness of both end portions in the width direction of the polarizing plate can be about 1.01 to 1.2 times the thickness of the center portion in the width direction, about 1.04 to 1.2 times, and further 1.1 to 1 It may be about twice as large. Even if it has such a large film thickness difference, according to the present invention, it is possible to effectively suppress slack.
　偏光子に貼合される保護フィルムは、透光性を有する（好ましくは光学的に透明な）熱可塑性樹脂、例えば、鎖状ポリオレフィン系樹脂（ポリプロピレン系樹脂等）、環状ポリオレフィン系樹脂（ノルボルネン系樹脂等）のようなポリオレフィン系樹脂；セルローストリアセテート、セルロースジアセテートのようなセルロースエステル系樹脂；ポリエステル系樹脂；ポリカーボネート系樹脂；（メタ）アクリル系樹脂；ポリスチレン系樹脂；又はこれらの混合物、共重合物等からなるフィルムであることができる。偏光子の両面に保護フィルムが貼合される場合、これらは互いに同種の樹脂からなる保護フィルムであってもよいし、異種の樹脂からなる保護フィルムであってもよい。 The protective film to be bonded to the polarizer is a light-transmitting (preferably optically transparent) thermoplastic resin such as a chain polyolefin resin (polypropylene resin, etc.), a cyclic polyolefin resin (norbornene-based). Polyolefin resins such as resin); cellulose ester resins such as cellulose triacetate and cellulose diacetate; polyester resins; polycarbonate resins; (meth) acrylic resins; polystyrene resins; or a mixture or copolymer thereof. It can be a film made of an object or the like. When a protective film is bonded on both surfaces of a polarizer, these may be protective films made of the same kind of resin or may be protective films made of different kinds of resins.
　保護フィルムは、位相差フィルム、輝度向上フィルムのような光学機能を併せ持つ保護フィルムであることもできる。例えば、上記熱可塑性樹脂からなるフィルムを延伸（一軸延伸又は二軸延伸等）したり、該フィルム上に液晶層等を形成したりすることにより、任意の位相差値が付与された位相差フィルムとすることができる。 The protective film may be a protective film having both optical functions such as a retardation film and a brightness enhancement film. For example, a retardation film provided with an arbitrary retardation value by stretching a film made of the thermoplastic resin (uniaxial stretching or biaxial stretching) or by forming a liquid crystal layer or the like on the film. It can be.
　鎖状ポリオレフィン系樹脂としては、ポリエチレン樹脂、ポリプロピレン樹脂のような鎖状オレフィンの単独重合体のほか、２種以上の鎖状オレフィンからなる共重合体を挙げることができる。 Examples of the chain polyolefin resin include a homopolymer of a chain olefin such as a polyethylene resin and a polypropylene resin, and a copolymer composed of two or more chain olefins.
　環状ポリオレフィン系樹脂は、環状オレフィンを重合単位として重合される樹脂の総称である。環状ポリオレフィン系樹脂の具体例を挙げれば、環状オレフィンの開環（共）重合体、環状オレフィンの付加重合体、環状オレフィンとエチレン、プロピレンのような鎖状オレフィンとの共重合体（代表的にはランダム共重合体）、及びこれらを不飽和カルボン酸やその誘導体で変性したグラフト重合体、並びにそれらの水素化物等である。中でも、環状オレフィンとしてノルボルネンや多環ノルボルネン系モノマー等のノルボルネン系モノマーを用いたノルボルネン系樹脂が好ましく用いられる。 Cyclic polyolefin-based resin is a general term for resins that are polymerized using cyclic olefins as polymerization units. Specific examples of cyclic polyolefin resins include ring-opening (co) polymers of cyclic olefins, addition polymers of cyclic olefins, copolymers of cyclic olefins and chain olefins such as ethylene and propylene (typically Are random copolymers), graft polymers obtained by modifying them with unsaturated carboxylic acids or derivatives thereof, and hydrides thereof. Among these, norbornene resins using norbornene monomers such as norbornene and polycyclic norbornene monomers as cyclic olefins are preferably used.
　セルロースエステル系樹脂は、セルロースと脂肪酸とのエステルである。セルロースエステル系樹脂の具体例は、セルローストリアセテート、セルロースジアセテート、セルローストリプロピオネート、セルロースジプロピオネートを含む。また、これらの共重合物や、水酸基の一部が他の置換基で修飾されたものを用いることもできる。これらの中でも、セルローストリアセテート（トリアセチルセルロース：ＴＡＣ）が特に好ましい。 The cellulose ester resin is an ester of cellulose and a fatty acid. Specific examples of the cellulose ester resin include cellulose triacetate, cellulose diacetate, cellulose tripropionate, and cellulose dipropionate. Moreover, these copolymers and those in which a part of the hydroxyl group is modified with other substituents can also be used. Among these, cellulose triacetate (triacetyl cellulose: TAC) is particularly preferable.
　ポリエステル系樹脂はエステル結合を有する、上記セルロースエステル系樹脂以外の樹脂であり、多価カルボン酸又はその誘導体と多価アルコールとの重縮合体からなるものが一般的である。多価カルボン酸又はその誘導体としてはジカルボン酸又はその誘導体を用いることができ、例えばテレフタル酸、イソフタル酸、ジメチルテレフタレート、ナフタレンジカルボン酸ジメチル等が挙げられる。多価アルコールとしてはジオールを用いることができ、例えばエチレングリコール、プロパンジオール、ブタンジオール、ネオペンチルグリコール、シクロヘキサンジメタノール等が挙げられる。 The polyester-based resin is a resin other than the cellulose ester-based resin having an ester bond, and is generally made of a polycondensate of a polyvalent carboxylic acid or a derivative thereof and a polyhydric alcohol. As the polyvalent carboxylic acid or a derivative thereof, a dicarboxylic acid or a derivative thereof can be used, and examples thereof include terephthalic acid, isophthalic acid, dimethyl terephthalate, and dimethyl naphthalenedicarboxylate. A diol can be used as the polyhydric alcohol, and examples thereof include ethylene glycol, propanediol, butanediol, neopentyl glycol, and cyclohexanedimethanol.
　ポリエステル系樹脂の具体例は、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンナフタレート、ポリトリメチレンテレフタレート、ポリトリメチレンナフタレート、ポリシクロへキサンジメチルテレフタレート、ポリシクロヘキサンジメチルナフタレートを含む。 Specific examples of the polyester resin include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polytrimethylene terephthalate, polytrimethylene naphthalate, polycyclohexanedimethyl terephthalate, and polycyclohexanedimethyl naphthalate.
　ポリカーボネート系樹脂は、カルボナート基を介してモノマー単位が結合された重合体からなる。ポリカーボネート系樹脂は、ポリマー骨格を修飾したような変性ポリカーボネートと呼ばれる樹脂や、共重合ポリカーボネート等であってもよい。 Polycarbonate resin is made of a polymer in which monomer units are bonded via a carbonate group. The polycarbonate-based resin may be a resin called a modified polycarbonate having a modified polymer skeleton, a copolymer polycarbonate, or the like.
　（メタ）アクリル系樹脂は、（メタ）アクリロイル基を有する化合物を主な構成モノマーとする樹脂である。（メタ）アクリル系樹脂の具体例は、例えば、ポリメタクリル酸メチルのようなポリ（メタ）アクリル酸エステル；メタクリル酸メチル－（メタ）アクリル酸共重合体；メタクリル酸メチル－（メタ）アクリル酸エステル共重合体；メタクリル酸メチル－アクリル酸エステル－（メタ）アクリル酸共重合体；（メタ）アクリル酸メチル－スチレン共重合体（ＭＳ樹脂等）；メタクリル酸メチルと脂環族炭化水素基を有する化合物との共重合体（例えば、メタクリル酸メチル－メタクリル酸シクロヘキシル共重合体、メタクリル酸メチル－（メタ）アクリル酸ノルボルニル共重合体等）を含む。好ましくは、ポリ（メタ）アクリル酸メチルのようなポリ（メタ）アクリル酸Ｃ1-6アルキルエステルを主成分とする重合体が用いられ、より好ましくは、メタクリル酸メチルを主成分（５０～１００重量％、好ましくは７０～１００重量％）とするメタクリル酸メチル系樹脂が用いられる。 The (meth) acrylic resin is a resin containing a compound having a (meth) acryloyl group as a main constituent monomer. Specific examples of the (meth) acrylic resin include, for example, poly (meth) acrylic acid esters such as polymethyl methacrylate; methyl methacrylate- (meth) acrylic acid copolymer; methyl methacrylate- (meth) acrylic acid Ester copolymer; methyl methacrylate-acrylate ester- (meth) acrylic acid copolymer; (meth) methyl acrylate-styrene copolymer (MS resin, etc.); methyl methacrylate and alicyclic hydrocarbon group And a copolymer with the compound (for example, methyl methacrylate-cyclohexyl methacrylate copolymer, methyl methacrylate- (meth) acrylate norbornyl copolymer, etc.). Preferably, a polymer based on a poly (meth) acrylic acid C 1-6 alkyl ester such as poly (meth) acrylic acid methyl is used, and more preferably methyl methacrylate is used as a main component (50 to 100). % Methyl methacrylate-based resin is used.
　保護フィルムの厚みは、偏光板の薄型化の観点から、好ましくは９０μｍ以下、より好ましくは５０μｍ以下、さらに好ましくは３０μｍ以下である。保護フィルムの厚みは、強度及び取扱性の観点から、通常５μｍ以上である。このような薄膜の保護フィルムを用いる場合であっても、本発明によれば、弛みを効果的に抑制することができる。 The thickness of the protective film is preferably 90 μm or less, more preferably 50 μm or less, and even more preferably 30 μm or less, from the viewpoint of thinning the polarizing plate. The thickness of the protective film is usually 5 μm or more from the viewpoint of strength and handleability. Even when such a thin protective film is used, according to the present invention, the slack can be effectively suppressed.
　弛みの生じやすさは、用いる保護フィルムの透湿度にも依存することが明らかとなっており、透湿度のより大きい保護フィルムを用いると弛みが発生しやすい。これは、透湿度が大きいフィルムは、寸法変化もしやすいためであると考えられる。例えば、環状ポリオレフィン系樹脂又は（メタ）アクリル系樹脂からなる保護フィルム／偏光子／ＴＡＣからなる保護フィルムの構成の偏光板よりも、ＴＡＣからなる保護フィルム／偏光子／ＴＡＣからなる保護フィルムの構成の偏光板の方が弛みを生じやすい。従って、ＴＡＣのような透湿度の高い保護フィルムを含む偏光板を取り扱う場合に、本発明はとりわけ有利である。 It has been clarified that the ease of occurrence of slack depends on the moisture permeability of the protective film to be used. If a protective film having a higher moisture permeability is used, the slack is likely to occur. This is considered to be because a film having a large moisture permeability is likely to change in dimensions. For example, rather than a polarizing plate having a protective film / polarizer / TAC protective film made of a cyclic polyolefin resin or a (meth) acrylic resin, a protective film / polarizer / TAC protective film made of TAC. The polarizing plate is more likely to sag. Therefore, the present invention is particularly advantageous when a polarizing plate including a protective film having a high moisture permeability such as TAC is handled.
　偏光板は、保護フィルム以外のフィルムや層を含むものであってもよい。保護フィルム以外のフィルムや層の具体例は、粘着剤層；粘着剤層の外面を保護するセパレートフィルム（剥離フィルム）；保護フィルムの表面を保護するプロテクトフィルム（表面保護フィルム）；偏光板に各種機能を付与するための表面処理層（コーティング層）；各種光学機能フィルムを含む。 The polarizing plate may include a film or layer other than the protective film. Specific examples of films and layers other than the protective film include: an adhesive layer; a separate film that protects the outer surface of the adhesive layer (release film); a protective film that protects the surface of the protective film (surface protective film); Surface treatment layer (coating layer) for imparting functions; including various optical functional films.
　粘着剤層に用いられる粘着剤としては、従来公知の適宜の粘着剤を用いることができ、例えば（メタ）アクリル系粘着剤、ウレタン系粘着剤、シリコーン系粘着剤、ポリエステル系粘着剤、ポリアミド系粘着剤、ポリエーテル系粘着剤、フッ素系粘着剤、ゴム系粘着剤等が挙げられる。中でも、透明性、粘着力、信頼性、リワーク性等の観点から、（メタ）アクリル系粘着剤が好ましく用いられる。粘着剤層の厚みは、一般に１～４０μｍ（例えば３～２５μｍ）であることができる。 As the pressure-sensitive adhesive used in the pressure-sensitive adhesive layer, a conventionally known appropriate pressure-sensitive adhesive can be used. For example, a (meth) acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, and a polyamide-based pressure-sensitive adhesive. Examples thereof include an adhesive, a polyether-based adhesive, a fluorine-based adhesive, and a rubber-based adhesive. Among these, a (meth) acrylic pressure-sensitive adhesive is preferably used from the viewpoints of transparency, adhesive strength, reliability, reworkability, and the like. The thickness of the pressure-sensitive adhesive layer can be generally 1 to 40 μm (for example, 3 to 25 μm).
　セパレートフィルムの構成材料は、ポリエチレンのようなポリエチレン系樹脂、ポリプロピレンのようなポリプロピレン系樹脂、ポリエチレンテレフタレートのようなポリエステル系樹脂等であることができる。中でも、ポリエチレンテレフタレートの延伸フィルムが好ましい。 The constituent material of the separate film can be a polyethylene resin such as polyethylene, a polypropylene resin such as polypropylene, a polyester resin such as polyethylene terephthalate, and the like. Among these, a stretched film of polyethylene terephthalate is preferable.
　プロテクトフィルムの構成材料としては、ポリエチレンのようなポリエチレン系樹脂、ポリプロピレンのようなポリプロピレン系樹脂、ポリエチレンテレフタレートのようなポリエステル系樹脂等が挙げられるが、その中でも、透湿性や機械的強度の観点からポリエチレンテレフタレートの延伸フィルムが好ましい。 Examples of the constituent material of the protective film include polyethylene resins such as polyethylene, polypropylene resins such as polypropylene, and polyester resins such as polyethylene terephthalate. Among them, from the viewpoint of moisture permeability and mechanical strength A stretched film of polyethylene terephthalate is preferred.
　表面処理層としては、ハードコート層、防眩層、反射防止層、帯電防止層、防汚層を挙げることができる。 Examples of the surface treatment layer include a hard coat layer, an antiglare layer, an antireflection layer, an antistatic layer, and an antifouling layer.
　光学機能フィルムとしては、ある種の偏光光を透過し、それと逆の性質を示す偏光光を反射する反射型偏光フィルム；表面に凹凸形状を有する防眩機能付フィルム；表面反射防止機能付フィルム；表面に反射機能を有する反射フィルム；反射機能と透過機能とを併せ持つ半透過反射フィルム；視野角補償フィルムが挙げられる。 As the optical functional film, a reflective polarizing film that transmits a certain kind of polarized light and reflects polarized light that shows the opposite property; a film with an antiglare function having an uneven shape on the surface; a film with a surface antireflection function; Examples thereof include a reflective film having a reflective function on the surface; a transflective film having both a reflective function and a transmissive function; and a viewing angle compensation film.
　凸部付き巻芯１０に巻回される偏光板の幅は特に制限されないが、通常３００～２５００ｍｍ程度であり、より典型的には５００～２０００ｍｍ程度である。また、偏光板の長さも特に制限されないが、通常数百ｍ～３０００ｍ程度（例えば２０００ｍ程度）であり、より典型的には１５００～２５００ｍ程度である。偏光子の幅とこれに貼合される保護フィルムの幅とは同じであっても異なっていてもよいが、保護フィルムの幅をより大きくし、保護フィルムの幅方向両端部（両端面）が偏光子の幅方向両端部（両端面）よりも外側に位置するように保護フィルムを貼合するのが一般的である。 The width of the polarizing plate wound around the convex core 10 is not particularly limited, but is usually about 300 to 2500 mm, and more typically about 500 to 2000 mm. The length of the polarizing plate is not particularly limited, but is usually about several hundred m to 3000 m (for example, about 2000 m), and more typically about 1500 to 2500 m. Although the width | variety of a polarizer and the width | variety of the protective film bonded to this may be the same or different, the width | variety of a protective film is made larger and the width direction both ends (end surface) of a protective film are It is common to paste a protective film so that it may be located outside both ends (both end surfaces) in the width direction of the polarizer.
　（３）凸部付き巻芯の凸部と巻回される偏光板との間の幅方向に関する位置関係
　図３は、凸部付き巻芯１０の凸部と巻回される偏光板２０との間の幅方向に関する位置関係を模式的に示す断面図である。図３では、一例として、偏光子２１とその一方の面に貼合される第１保護フィルム２２と他方の面に貼合される第２保護フィルム２３から構成される偏光板２０を用いる場合を示しているが、上述のように偏光板の層構成はこれに限定されるものではない。また図３は、凸部付き巻芯１０の第１凸部１０ａのみを採り上げているが、以下に説明する内容は、第２凸部１０ｂとの位置関係に対しても同様に適用される。 (3) Positional relationship regarding width direction between convex part of winding core with convex part and polarizing plate wound FIG. 3 shows the convex part of the core 10 with convex part and the polarizing plate 20 to be wound. It is sectional drawing which shows typically the positional relationship regarding the width direction between. In FIG. 3, the case where the polarizing plate 20 comprised from the polarizer 21 and the 1st protective film 22 bonded on the one surface and the 2nd protective film 23 bonded on the other surface is used as an example. Although shown, the layer configuration of the polarizing plate is not limited to this as described above. FIG. 3 shows only the first convex portion 10a of the core 10 with convex portions, but the contents described below are similarly applied to the positional relationship with the second convex portion 10b.
　本発明の偏光板ロールにおいて偏光板２０は、偏光子２１の幅方向における一方の端部（端面、図３におけるＴ1）が第１凸部１０ａ上に位置し、図３において図示されていないが、他方の端部（端面）が第２凸部１０ｂ上に位置するように凸部付き巻芯１０に巻回される。偏光子２１の端部（端面）Ｔ1が第１凸部１０ａ上に位置するとは、図３を参照して、偏光子２１の端部Ｔ1が第１凸部１０ａの外側端部Ｔ2と内側端部Ｔ3の間に位置することをいう（Ｔ1がＴ2又はＴ3と一致する場合を含む。）。これにより、十分な弛み抑制効果を得ることができる。偏光子２１の端部Ｔ1が第１凸部１０ａの外側端部（端面）Ｔ2よりも外側に位置する場合や、第１凸部１０ａの内側端部（端面）Ｔ3よりも内側に位置する場合には、弛み抑制効果を十分に得ることができない。好ましくは、偏光子２１の端部Ｔ1は、第１凸部１０ａの内側端部Ｔ3よりも外側に位置している。 In the polarizing plate roll of the present invention, the polarizing plate 20 has one end portion (end surface, T 1 in FIG. 3) in the width direction of the polarizer 21 located on the first convex portion 10a, which is not shown in FIG. However, it winds around the core 10 with a convex part so that the other edge part (end surface) may be located on the 2nd convex part 10b. The end (end face) T 1 of the polarizer 21 is positioned on the first convex portion 10a. Referring to FIG. 3, the end T 1 of the polarizer 21 is the outer end T 2 of the first convex portion 10a. And the inner end T 3 (including the case where T 1 matches T 2 or T 3 ). Thereby, sufficient slack suppression effect can be acquired. When the end portion T 1 of the polarizer 21 is positioned outside the outer end portion (end surface) T 2 of the first convex portion 10a, or inside the inner end portion (end surface) T 3 of the first convex portion 10a. In the case of being positioned, it is not possible to sufficiently obtain a slack suppressing effect. Preferably, the end portion T 1 of the polarizer 21 is located outside the inner end portion T 3 of the first convex portion 10a.
　第１凸部１０ａ上に位置する（乗っている）偏光子２１の端部領域（端部Ｔ1を含む領域）の幅Ｗ2（偏光子２１と第１凸部１０ａとの重複幅）は、５ｍｍ以上であることが好ましく、１０ｍｍ以上であることがより好ましい。図３を参照して、当該重複幅Ｗ2は、偏光子２１の端部Ｔ1から第１凸部１０ａの内側端部Ｔ3までの距離に相当する。重複幅Ｗ2があまりに小さいと十分な弛み抑制効果が得られにくい。重複幅Ｗ2の上限は特に制限されないが、例えば３０ｍｍ程度とすることができる。第１凸部１０ａの幅Ｗ1は、上記好ましい重複幅Ｗ2が得られるよう５ｍｍ以上とすることが好ましい。幅Ｗ1の上限は特に制限されず、例えば１００ｍｍである。１つの好ましい実施形態として、偏光子２１の端部Ｔ1の位置と第１凸部１０ａの外側端部Ｔ2との位置を一致又はおよそ一致させ（Ｗ1とＷ2が同じか、又はおよそ同じとし）、第１凸部１０ａの全幅又はほぼ全幅にわたって偏光子２１の端部領域を重複させる（乗せる）形態を挙げることができる。 The width W 2 (the overlapping width of the polarizer 21 and the first convex portion 10a) of the end region (region including the end portion T 1 ) of the polarizer 21 positioned (ridden) on the first convex portion 10a is as follows. 5 mm or more is preferable, and 10 mm or more is more preferable. Referring to FIG. 3, the overlap width W 2 corresponds to the distance from the end T 1 of the polarizer 21 to the inner end T 3 of the first convex portion 10a. If the overlap width W 2 is too small, it is difficult to obtain a sufficient slack suppressing effect. The upper limit of the overlap width W 2 is not particularly limited, but can be about 30 mm, for example. The width W 1 of the first convex portion 10a is preferably 5 mm or more so that the preferable overlapping width W 2 is obtained. The upper limit of the width W 1 is not particularly limited, and is 100 mm, for example. As one preferred embodiment, the position of the end T 1 of the polarizer 21 and the position of the outer end T 2 of the first convex portion 10a are matched or approximately matched (W 1 and W 2 are the same or approximately equal to each other). The same), and the end region of the polarizer 21 may be overlapped (mounted) over the entire width or almost the entire width of the first convex portion 10a.
　弛み抑制効果をより効果的に得るために、図３を参照して、第１凸部１０ａの高さＨは、５０μｍ以上であることが好ましく、１２０μｍ以上であることがより好ましく、５００μｍ以上であることがさらに好ましい。高さＨが大きいほど、弛み抑制効果は高い傾向にある。高さＨの上限は、１５００μｍ（例えば１０００μｍ）であることができる。例えば樹脂フィルムの貼着によって凸部を形成する場合、図４に示されるように、高さＨを大きくするために、樹脂フィルムを複数層巻き重ねてもよい。図４は、第１樹脂フィルムｔ1の上に第２樹脂フィルムｔ2を巻き重ねることによって第１凸部１０ａを形成した例である。 In order to more effectively obtain the slack suppressing effect, referring to FIG. 3, the height H of the first convex portion 10a is preferably 50 μm or more, more preferably 120 μm or more, and 500 μm or more. More preferably it is. As the height H is larger, the slack suppression effect tends to be higher. The upper limit of the height H can be 1500 μm (for example, 1000 μm). For example, when forming a convex part by sticking of a resin film, in order to enlarge height H, as shown in FIG. Figure 4 is an example of forming a first convex portion 10a by superimposing winding the second resin film t 2 on the first resin film t 1.
　上述のように、保護フィルムの幅をより大きくし、保護フィルムの幅方向両端部が偏光子の幅方向両端部よりも外側に位置するように保護フィルムを貼合するのが一般的であるところ、図３を参照して、第１保護フィルム２２及び第２保護フィルム２３のはみ出し幅Ｗ3（保護フィルム２２，２３の端部Ｔ4から偏光子２１の端部Ｔ1までの距離）は、１～１００ｍｍ程度（例えば５～６０ｍｍ程度）とすることができる。 As described above, the width of the protective film is made larger, and the protective film is generally pasted so that both ends in the width direction of the protective film are located outside the both ends in the width direction of the polarizer. 3, the protrusion width W 3 of the first protective film 22 and the second protective film 23 (distance from the end T 4 of the protective films 22 and 23 to the end T 1 of the polarizer 21) is: It can be about 1 to 100 mm (for example, about 5 to 60 mm).
　（４）凸部付き巻芯への偏光板の巻き取りと巻きスジ欠陥の抑制
　凸部付き巻芯１０をその回転軸を中心に回転させることによって偏光板２０が巻き取られる。この際、図５に示されるように、巻き取りを開始する前に、固定部材３０を用いて〔図５（ａ）〕、偏光板２０の巻き始め端（長手方向始端）を、凸部付き巻芯１０の外周面に固定することが好ましい〔図５（ｂ）〕。簡便に偏光板２０を固定できることから、固定部材３０としては、両面テープを好ましく用いることができる。例えば、両面テープである固定部材３０を凸部付き巻芯１０の回転軸と平行に、凸部付き巻芯１０の外周面に貼着し、その上に偏光板２０の巻き始め端を、偏光板２０の短辺方向が凸部付き巻芯１０の回転軸と平行となるように貼着する。偏光板２０の巻き始め端を凸部付き巻芯１０に固定しておくことにより、特に初期における偏光板２０の巻き取りをスムーズに行うことができる。 (4) Winding of the polarizing plate on the winding core with the convex portion and suppression of winding streak defects The polarizing plate 20 is wound by rotating the winding core 10 with the convex portion around its rotation axis. At this time, as shown in FIG. 5, before starting winding, the fixing member 30 is used [FIG. 5 (a)], and the winding start end (longitudinal direction start end) of the polarizing plate 20 is provided with a convex portion. It is preferable to fix to the outer peripheral surface of the winding core 10 [FIG.5 (b)]. Since the polarizing plate 20 can be easily fixed, a double-sided tape can be preferably used as the fixing member 30. For example, a fixing member 30 that is a double-sided tape is attached to the outer peripheral surface of the core 10 with a convex portion parallel to the rotation axis of the core 10 with a convex portion, and the winding start end of the polarizing plate 20 is polarized on the fixing member 30. It sticks so that the short side direction of the board 20 may become parallel to the rotating shaft of the core 10 with a convex part. By fixing the winding start end of the polarizing plate 20 to the core 10 with the convex portion, the winding of the polarizing plate 20 in the initial stage can be smoothly performed.
　ただし、両面テープのような固定部材を用いて偏光板の巻き始め端を、凸部を有しない一般的な巻芯に固定してから偏光板を巻き取る場合にはとりわけ、「巻きスジ欠陥」と呼ぶ不具合を生じることがある。図６を参照して、「巻きスジ欠陥」とは、固定部材上に固定された偏光板の巻き始め端及び／又は固定部材と、巻芯外周面との間に生じる高低差、すなわち段差部分に、巻回される偏光板が押し付けられることにより発生する、偏光板の幅方向に延びるスジ状の凹み欠陥である。巻きスジ欠陥には、偏光板の巻き始め端における角部（端部の短辺角）に由来する欠陥Ｋ1（偏光板の巻き始め端における角部に押し付けられることにより発生する欠陥）と、両面テープのような固定部材の角部に由来する欠陥Ｋ2（固定部材の角部に押し付けられることにより発生する欠陥）とがある（図６）。 However, especially when winding the polarizing plate after fixing the winding start end of the polarizing plate to a general winding core having no convex portion using a fixing member such as a double-sided tape, "winding streak defect" May cause a problem. Referring to FIG. 6, “winding streak defect” means a difference in height generated between the winding start end and / or fixing member of the polarizing plate fixed on the fixing member and the outer peripheral surface of the core, that is, a step portion. In addition, it is a streak-like dent defect extending in the width direction of the polarizing plate, which is generated by pressing the wound polarizing plate. In the winding streak defect, a defect K 1 (defect generated by being pressed against the corner at the winding start end of the polarizing plate) derived from the corner at the winding start end of the polarizing plate (short side corner of the end), and There is a defect K 2 (defect generated by being pressed against the corner of the fixing member) derived from the corner of the fixing member such as a double-sided tape (FIG. 6).
　巻きスジ欠陥は、偏光板ロールの内側にある偏光板（巻き始め初期の偏光板）に強く生じ、偏光板ロールの外側にいくほど弱くなっていくが、偏光板の巻き始めから長手方向数十ｍにわたって発生し得る。巻きスジ欠陥を含む偏光板を液晶表示装置のような画像表示装置に適用した場合、視認性が低下するおそれがある。 Winding streak defects are strongly generated in the polarizing plate inside the polarizing plate roll (initial polarizing plate at the start of winding), and become weaker toward the outer side of the polarizing plate roll. can occur over m. When a polarizing plate containing winding stripe defects is applied to an image display device such as a liquid crystal display device, the visibility may be lowered.
　本発明に係る偏光板ロールは、このような巻きスジ欠陥の抑制にも有利である。概して、凸部の高さＨが小さいほど、巻きスジ欠陥の抑制効果は高い傾向にある。従って、十分な弛み抑制効果を得ながら、巻きスジ欠陥の抑制効果を得たい場合には、高さＨは５００μｍ未満とすることが好ましく、４００μｍ以下とすることが好ましい。巻きスジ欠陥の抑制効果を得るためには、高さＨは５０μｍ以上（例えば１００μｍ以上）であることが好ましい。 The polarizing plate roll according to the present invention is advantageous for suppressing such winding streak defects. In general, the smaller the height H of the convex portion, the higher the effect of suppressing winding streak defects. Therefore, when it is desired to obtain a winding streak defect suppressing effect while obtaining a sufficient slack suppressing effect, the height H is preferably less than 500 μm, and preferably 400 μm or less. In order to obtain the effect of suppressing winding streak defects, the height H is preferably 50 μm or more (for example, 100 μm or more).
　以下、実施例及び比較例を示して本発明をさらに具体的に説明するが、本発明はこれらの例によって限定されるものではない。 Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples.
　＜比較例１＞
　トリアセチルセルロース（ＴＡＣ）からなる第１保護フィルム〔厚み４０μｍ〕／接着剤層／縦一軸延伸されたポリビニルアルコール系樹脂フィルムに二色性色素を吸着配向してなる偏光子〔厚み２８μｍ〕／接着剤層／ＴＡＣからなる第２保護フィルム〔厚み４０μｍ〕／延伸ポリエチレンフタレートからなるプロテクトフィルム〔厚み６２μｍ〕の層構成からなる長尺の偏光板をロール・トゥ・ロール方式で連続的に作製するとともに、円柱状巻芯（凸部なし）に巻回していき、偏光板ロールを得た。偏光板ロール作製における具体的条件は次のとおりである。なお、偏光板の巻き始め端（長手方向始端）は、厚み１７６μｍの両面テープを用いて、巻芯の外周面に固定した。 <Comparative Example 1>
First protective film made of triacetylcellulose (TAC) [thickness 40 μm] / adhesive layer / polarizer obtained by adsorbing and orienting a dichroic dye to a longitudinally uniaxially stretched polyvinyl alcohol resin film / thickness 28 μm / adhesion A long polarizing plate having a layer structure of a protective film [thickness 40 μm] / protective film [thickness 62 μm] made of an agent layer / TAC and a stretched polyethylene phthalate is continuously produced by a roll-to-roll method. Then, it was wound around a cylindrical core (no protrusion) to obtain a polarizing plate roll. The specific conditions for producing the polarizing plate roll are as follows. In addition, the winding start end (longitudinal direction start end) of the polarizing plate was fixed to the outer peripheral surface of the core using a double-sided tape having a thickness of 176 μm.
　〔１〕円柱状巻芯（凸部なし）
　・材質：ＦＲＰ（繊維強化プラスチック）、
　・幅方向（回転軸方向）長さ：１４８０ｍｍ、
　・直径：１６７ｍｍφ、
　〔２〕偏光板
　・保護フィルムの幅：１３３０ｍｍ、
　・偏光子の幅：１２７０ｍｍ、
　・図３におけるＷ3：３０ｍｍ（両端とも）、
　・偏光板長さ：約２０００ｍ、
　・偏光板巻き取り時の張力：２５０Ｎ。 [1] Cylindrical core (no protrusion)
・ Material: FRP (fiber reinforced plastic),
・ Width direction (rotating axis direction) length: 1480 mm,
・ Diameter: 167mmφ,
[2] Polarizing plate Width of protective film: 1330 mm,
-Polarizer width: 1270 mm,
- Figure 3 in W 3: 30 mm (both ends),
-Polarizing plate length: about 2000m
-Tension at the time of winding a polarizing plate: 250N.
　＜実施例１＞
　図１と同様の凸部付き巻芯を用い、偏光板ロール作製における具体的条件を次のとおりとしたこと以外は、比較例１と同様にして偏光板ロールを作製した。偏光板は、偏光子の幅方向における一方の端部が第１凸部上に位置し、他方の端部が第２凸部上に位置するように巻回した。凸部付き巻芯の第１及び第２凸部は、片面に粘着剤層を有する一定幅の樹脂フィルムテープを、図２のように巻芯本体部分の外周面にほぼ全周にわたって貼着することによって形成した。 <Example 1>
A polarizing plate roll was produced in the same manner as in Comparative Example 1 except that the same core with projections as in FIG. 1 was used and the specific conditions for producing the polarizing plate roll were as follows. The polarizing plate was wound so that one end portion in the width direction of the polarizer was positioned on the first convex portion and the other end portion was positioned on the second convex portion. As for the 1st and 2nd convex part of the core with a convex part, the fixed-width resin film tape which has an adhesive layer on one side is stuck on the outer peripheral surface of a core main-body part over substantially the whole circumference like FIG. Formed by.
　〔１〕凸部付き巻芯（本体部分：円柱状）
　・材質：ＦＲＰ（繊維強化プラスチック）、
　・幅方向（回転軸方向）長さ：１４８０ｍｍ、
　・本体部分の直径：１６７ｍｍφ、
　・第１及び第２凸部の幅（図３におけるＷ1）：１０ｍｍ、
　・第１及び第２凸部の高さ（図３におけるＨ）：７２０μｍ、
　〔２〕偏光板
　・保護フィルムの幅：１３３０ｍｍ、
　・偏光子の幅：１２７０ｍｍ、
　・保護フィルムのはみ出し幅（図３におけるＷ3）：３０ｍｍ（両端とも）、
　・偏光板長さ：約２０００ｍ、
　・偏光板巻き取り時の張力：２５０Ｎ、
　〔３〕偏光子と凸部付き巻芯との位置関係
　・偏光子と第１及び第２凸部との重複幅（図３におけるＷ2）：１０ｍｍ。 [1] Convex core (main body part: cylindrical)
・ Material: FRP (fiber reinforced plastic),
・ Width direction (rotating axis direction) length: 1480 mm,
・ Diameter of body part: 167mmφ,
The width of the first and second convex portions (W 1 in FIG. 3): 10 mm,
-Height of 1st and 2nd convex part (H in FIG. 3): 720 micrometers,
[2] Polarizing plate Width of protective film: 1330 mm,
-Polarizer width: 1270 mm,
-The protruding width of the protective film (W 3 in FIG. 3 ): 30 mm (both ends),
-Polarizing plate length: about 2000m
・ Tension during winding of polarizing plate: 250 N,
[3] the overlapping width of the positional relationship, the polarizer and the first and second protrusions of the polarizer and the lug core (W 2 in FIG. 3): 10 mm.
　＜実施例２＞
　第１及び第２凸部の高さ（図３におけるＨ）を３６０μｍとしたこと以外は実施例１と同様にして偏光板ロールを作製した。 <Example 2>
A polarizing plate roll was produced in the same manner as in Example 1 except that the height of the first and second protrusions (H in FIG. 3) was 360 μm.
　＜実施例３＞
　第１及び第２凸部の高さ（図３におけるＨ）を１８０μｍとしたこと以外は実施例１と同様にして偏光板ロールを作製した。 <Example 3>
A polarizing plate roll was produced in the same manner as in Example 1 except that the height of the first and second protrusions (H in FIG. 3) was 180 μm.
　＜実施例４＞
　偏光子と第１及び第２凸部との重複幅（図３におけるＷ2）を２ｍｍとしたこと以外は実施例１と同様にして偏光板ロールを作製した。 <Example 4>
A polarizing plate roll was produced in the same manner as in Example 1 except that the overlapping width (W 2 in FIG. 3) between the polarizer and the first and second convex portions was 2 mm.
　＜実施例５＞
　第１保護フィルムをＴＡＣフィルムから厚み２０μｍの環状ポリオレフィン系樹脂（ＣＯＰ）フィルムに変更したこと以外は実施例２と同様にして偏光板ロールを作製した。 <Example 5>
A polarizing plate roll was produced in the same manner as in Example 2 except that the first protective film was changed from the TAC film to a cyclic polyolefin resin (COP) film having a thickness of 20 μm.
　＜比較例２＞
　偏光子と第１及び第２凸部との重複幅（図３におけるＷ2）を０ｍｍとしたこと、すなわち、偏光子の端部Ｔ1が第１及び第２凸部の内側端部Ｔ3よりも内側に位置するように偏光板を巻回したこと以外は実施例１と同様にして偏光板ロールを作製した。 <Comparative example 2>
The overlapping width (W 2 in FIG. 3) between the polarizer and the first and second convex portions is 0 mm, that is, the end portion T 1 of the polarizer is the inner end portion T 3 of the first and second convex portions. A polarizing plate roll was produced in the same manner as in Example 1 except that the polarizing plate was wound so as to be located on the inner side.
　実施例１～５及び比較例１～２における偏光板ロールの主要な製造条件を表１にまとめた。作製した偏光板ロールを２５℃５０％ＲＨの環境下で１５日間保管した後、下記項目について評価を行った。結果を表１に示す。 Table 1 summarizes the main production conditions for polarizing plate rolls in Examples 1 to 5 and Comparative Examples 1 and 2. The produced polarizing plate roll was stored for 15 days in an environment of 25 ° C. and 50% RH, and then the following items were evaluated. The results are shown in Table 1.
　（ａ）弛みの程度
　上記保管後の偏光板ロールを巻き出し、弛みの程度（長さ）を測定して、下記の基準に従って評価した。弛みの程度（長さ）とは、弛み（波打ち状の変形）が偏光板の幅方向端部から偏光板（より正確には保護フィルム）の内側（中央部側）へ延びている長さをいう。凸部を有しない巻芯を用いた比較例１の偏光板ロールから偏光板を巻き出したところ、巻き始めからの巻回数７０～７５回の地点で弛みの程度が最大であった。 (A) Degree of slackness The polarizing plate roll after the storage was unwound and the degree of slackness (length) was measured and evaluated according to the following criteria. The degree of slack (length) is the length of slack (wave-like deformation) extending from the end of the polarizing plate in the width direction to the inside (center side) of the polarizing plate (more precisely, the protective film). Say. When the polarizing plate was unwound from the polarizing plate roll of Comparative Example 1 using a winding core having no convex portion, the degree of looseness was maximum at a point where the number of windings was 70 to 75 from the start of winding.
　Ａ：弛みの長さの最大値が６０ｍｍ未満である、
　Ｂ：弛みの長さの最大値が６０ｍｍ以上１２０ｍｍ未満である、
　Ｃ：弛みの長さの最大値が１２０ｍｍ以上である。 A: The maximum value of the length of slack is less than 60 mm.
B: The maximum value of the length of slack is 60 mm or more and less than 120 mm,
C: The maximum value of the length of slack is 120 mm or more.
　（ｂ）巻きスジ欠陥の程度
　上記保管後の偏光板ロールを巻き出し、偏光板の巻き始めからの巻きスジ欠陥について以下の基準で発生長さを測定して、巻きスジ欠陥の程度を評価した。 (B) Degree of winding streak defect The polarizing plate roll after the above storage was unwound, and the generation length was measured according to the following criteria for the winding streak defect from the beginning of the polarizing plate, and the degree of the winding streak defect was evaluated. .
　Ａ：目視で強い巻きスジ欠陥が観察される長さが１０ｍ未満である、
　Ｂ：目視で強い巻きスジ欠陥が観察される長さが１０ｍ以上１５ｍ未満である、
　Ｃ：目視で強い巻きスジ欠陥が観察される長さが１５ｍ以上である。 A: The length by which a strong winding streak defect is observed visually is less than 10 m.
B: The length at which a strong winding streak defect is observed visually is 10 m or more and less than 15 m.
C: The length by which a strong winding streak defect is visually observed is 15 m or more.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　１０　凸部付き巻芯、１０ａ　第１凸部、１０ｂ　第２凸部、２０　偏光板、２１　偏光子、２２　第１保護フィルム、２３　第２保護フィルム、３０　固定部材。 10 winding core with convex part, 10a first convex part, 10b second convex part, 20 polarizing plate, 21 polarizer, 22 first protective film, 23 second protective film, 30 fixing member.

Claims (5)

  1. 　周方向に延びる第１凸部及び第２凸部を外周面に備える巻芯と、前記巻芯に巻回される偏光板とを含み、
    　前記偏光板は、偏光子とその少なくとも一方の面上に積層される保護フィルムとを備えるものであり、
    　前記偏光板は、前記偏光子の幅方向における一方の端部が前記第１凸部上に位置し、他方の端部が前記第２凸部上に位置するように前記巻芯に巻回される、偏光板ロール。     Including a core provided with a first protrusion and a second protrusion extending in the circumferential direction on the outer peripheral surface, and a polarizing plate wound around the core,
    The polarizing plate comprises a polarizer and a protective film laminated on at least one surface thereof,
    The polarizing plate is wound around the core so that one end in the width direction of the polarizer is positioned on the first convex portion and the other end is positioned on the second convex portion. A polarizing plate roll.
  2. 　前記第１凸部及び前記第２凸部上に位置する前記偏光子の端部領域の幅は、それぞれ５ｍｍ以上である、請求項１に記載の偏光板ロール。 2. The polarizing plate roll according to claim 1, wherein widths of end regions of the polarizer located on the first convex portion and the second convex portion are each 5 mm or more.
  3. 　前記第１凸部及び前記第２凸部の高さは、それぞれ５０μｍ以上である、請求項１又は２に記載の偏光板ロール。 The polarizing plate roll according to claim 1 or 2, wherein the height of each of the first convex portion and the second convex portion is 50 µm or more.
  4. 　前記第１凸部及び前記第２凸部は、前記外周面に貼着された樹脂フィルムで構成される、請求項１～３のいずれか１項に記載の偏光板ロール。 The polarizing plate roll according to any one of claims 1 to 3, wherein the first convex portion and the second convex portion are made of a resin film adhered to the outer peripheral surface.
  5. 　前記偏光板の幅方向両端部の厚みは、幅方向中央部の厚みの１．０１～１．２倍である、請求項１～４のいずれか１項に記載の偏光板ロール。 The polarizing plate roll according to any one of claims 1 to 4, wherein the thickness of both end portions in the width direction of the polarizing plate is 1.01 to 1.2 times the thickness of the central portion in the width direction.
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