CN106199810B - Method for manufacturing polarizing plate - Google Patents

Method for manufacturing polarizing plate Download PDF

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Publication number
CN106199810B
CN106199810B CN201610576416.7A CN201610576416A CN106199810B CN 106199810 B CN106199810 B CN 106199810B CN 201610576416 A CN201610576416 A CN 201610576416A CN 106199810 B CN106199810 B CN 106199810B
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polarizing plate
adhesive
liquid crystal
crystal display
display panel
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CN106199810A (en
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野间弘道
竹内智康
松本力也
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Sumitomo Chemical Co Ltd
Fuji Kikai Kogyo Co Ltd
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Sumitomo Chemical Co Ltd
Fuji Kikai Kogyo Co Ltd
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    • 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
    • G02B5/3041—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 comprising multiple thin layers, e.g. multilayer stacks
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0007—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality
    • B32B37/0015—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality to avoid warp or curl
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • 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
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
    • C08L29/02—Homopolymers or copolymers of unsaturated alcohols
    • C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Quality & Reliability (AREA)
  • Mechanical Engineering (AREA)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention relates to a method for manufacturing a polarizing plate, wherein protective films (31, 32) are respectively laminated and bonded on both surfaces of a polarizing plate (35), wherein the polarizing plate (35) and the protective films (31, 32) are superposed through an adhesive to obtain a laminated body (37), then the laminated body (37) is adhered to the outer surface of a convex curved surface formed into an arc shape along the conveying direction of the laminated body (37), preferably a roller (38), and simultaneously active energy rays from active energy ray irradiation devices (39, 40) are irradiated to polymerize and solidify the adhesive.

Description

Method for manufacturing polarizing plate
The present application is a divisional application of an application having an application number of 200810191091.6 and an invention name of "method for manufacturing polarizing plate" filed on 24.11.2008 by the applicant.
Technical Field
The present invention relates to a method for manufacturing a polarizing plate which is useful as one of optical members constituting a liquid crystal display device.
Background
Polarizing plates have utility as one of optical components constituting liquid crystal display devices. Fig. 4 shows a structure in which a linear polarizing film, which is one type of polarizing plate, is laminated on a liquid crystal cell. A linearly polarizing film 12 is laminated on the light source side surface of a liquid crystal cell 10 constituting a liquid crystal display panel by an adhesive layer 11 to constitute the liquid crystal display panel.
The polarizing plate is generally used by being incorporated into a liquid crystal display device in a state where protective films are laminated on both surfaces of a polarizer. That is, as shown in fig. 5, in a general polarizing plate 20, protective films 22 and 23 are laminated and bonded to both surfaces of a polarizing plate 21 via adhesive layers 24 and 25 (JP 2004-245925 a and JP2005-173216 a).
However, the polarizing plate manufactured as described above may be curled to be concave (hereinafter, referred to as "reverse curling") on the side attached to the liquid crystal cell, or may be waved (hereinafter, referred to as "wavy curling") as a whole. Such reverse curling and wave curling tend to cause the liquid crystal panel to be scrapped because air bubbles remain on the surface of the polarizing plate when the polarizing plate is bonded to the liquid crystal cell. Therefore, it is desirable that the polarizing plate not generate reverse curl or wavy curl, not generate curl, or curl to form a protrusion (hereinafter referred to as "positive curl") on the side attached to the liquid crystal cell even if the curl is generated.
Disclosure of Invention
The invention aims to provide a method and an apparatus for manufacturing a polarizing plate, which can prevent generation of reverse curling and wave curling.
The present inventors have conducted extensive studies to achieve the above object, and as a result, have found that the occurrence of reverse curl and wavy curl can be suppressed by polymerizing and curing an adhesive in a state where a laminate formed by laminating a protective film on one surface or both surfaces of a polarizing plate via an adhesive is bent in a positive curl manner, and have completed the present invention.
That is, the method for manufacturing a polarizing plate of the present invention is a method for manufacturing a polarizing plate in which a protective film is laminated and bonded to one surface or both surfaces of a polarizing plate, wherein the polarizing plate and the protective film are stacked with an adhesive therebetween to obtain a laminate, and then the laminate is adhered to a convex curved surface formed in an arc shape along a longitudinal direction (transport direction) of the laminate, and the adhesive is polymerized and cured. The convex curved surface may be, for example, the outer peripheral surface of a roller.
The polarizing plate may be a polyvinyl alcohol film in which iodine or a dichroic dye stretched in one direction is adsorbed and oriented, one of the protective films may be an amorphous polyolefin resin film, and the other protective film may be a triacetyl cellulose film, but the polarizing plate is not limited thereto.
The laminate adhered to the convex curved surface may be polymerized and cured by irradiation with an active energy ray or may be polymerized and cured by heating.
The polarizing plate manufacturing apparatus of the present invention includes a mechanism for applying an adhesive to one side of a protective film or both sides of a polarizer; a mechanism for superposing the protective film on both sides of the polarizing plate via the adhesive layer; and a mechanism for polymerizing and curing the adhesive, wherein the mechanism for polymerizing and curing the adhesive comprises: a roller for adhering the polarizing plate on which the protective film is superposed to the outer peripheral surface and simultaneously conveying the polarizing plate, and an active energy ray irradiation device for irradiating the outer peripheral surface of the roller with active energy rays.
According to the present invention, the laminate in which the polarizing plate and the protective film are laminated with the adhesive interposed therebetween is formed into a convex curved surface in an arc shape along the longitudinal direction (transport direction) of the laminate, and the adhesive is polymerized and cured by irradiation with active energy rays, whereby when the polarizing plate is bonded to the liquid crystal cell, the occurrence of reverse curl and wavy curl, which are causes of the occurrence of air bubbles remaining on the bonding surface and deterioration of the liquid crystal panel, can be suppressed.
Drawings
FIG. 1 is a schematic side view showing an apparatus for manufacturing a polarizing plate according to an embodiment of the present invention.
Fig. 2(a) and (B) are schematic explanatory views showing a method for evaluating the waviness generated in the polarizing plate.
Fig. 3 is an explanatory view showing a method of polymerizing and curing an adhesive by irradiation with an active energy ray in comparative examples 1 and 2.
Fig. 4 is an explanatory view for explaining a structure in which a linear polarizing film, which is one of polarizing plates, is laminated on a liquid crystal cell.
Fig. 5 is an explanatory view illustrating the structure of the polarizing plate.
Description of the symbols
30: device for manufacturing polarizing plate
31. 32: protective film
33. 34: adhesive coating device
35: polarizing plate
36: clamping roller
37: laminated body
38: roller
39. 40, 41: active energy ray irradiation device
42: grip roller for conveying
50: polarizing plate
51: wavelength of light
52: amplitude of vibration
60: laminated body
61: ultraviolet irradiation device
Detailed Description
An embodiment of the present invention is explained below. The polarizing plate in this embodiment is formed of a polarizer and protective films laminated on both surfaces thereof with an adhesive. As the polarizer, a polarizer conventionally used for producing a polarizing plate (for example, a polarizer described in japanese unexamined patent application publication No. 2004-24925) can be used, and examples thereof include a film obtained by dyeing uniaxially stretched polyvinyl alcohol with iodine or a dichroic dye and then subjecting the dyed polyvinyl alcohol to a boric acid treatment. The thickness of the polarizing plate is preferably in the range of 5 to 50 μm.
The protective films laminated on both sides of the polarizing plate may be of the same type or different types. When different types of protective films are used, a resin film having a low moisture permeability, such as an amorphous polyolefin resin film, a polyester resin film, an acrylic resin film, a polycarbonate resin film, a polysulfone resin film, or an alicyclic polyimide resin film, is used as one of the protective films. Examples of the amorphous polyolefin resin film include "TOPAS" manufactured by Ticona of germany, "ARTON" manufactured by JSR, "ゼオノア (ZEONOR)" and ゼオネックス (ZEONEX) "manufactured by ZEON of japan, and" アペル (APPEL) "manufactured by mitsui chemical corporation. For the other side of the protective film, an acetyl cellulose ester film such as triacetyl cellulose film or diacetyl cellulose film is used in addition to the above film. Examples of the triacetyl cellulose film include "FUJITAC TD 80", "FUJITAC TD80 UF" and "FUJITAC TD80 UZ" manufactured by fuji film (co., ltd.), and "KC 8UX 2M" and "KC 8 UY" manufactured by simmon (co., uka).
Before the protective film is bonded to the polarizing plate, the bonding surface may be subjected to an easy-adhesion treatment such as an alkalization treatment, a corona discharge treatment, a primer treatment, an anchor coating treatment, or the like. The surface of the protective film opposite to the surface to be bonded to the polarizing plate may have various treatment layers such as a hard coat layer, an antireflection layer, and an antiglare layer. The thickness of the protective film is usually about 5 to 200. mu.m, preferably 10 to 120. mu.m, and more preferably 10 to 85 μm.
In view of weather resistance, refractive index, cationic polymerization property, and the like, for example, as described in JP2004-245925 a, an epoxy resin containing no aromatic ring in the molecule can be used as the adhesive, but the adhesive is not limited thereto, and various adhesives conventionally used for producing polarizing plates can be used. As the epoxy resin, for example, hydrogenated epoxy resin, alicyclic epoxy resin, aliphatic epoxy resin, or the like is used. The adhesive composition for coating can be prepared by adding a polymerization initiator such as a photo cation polymerization initiator for polymerization by irradiation of an active energy ray, a thermal cation polymerization initiator for polymerization by heating, and other additives (such as an activator) to the epoxy resin component.
The polarizing plate manufacturing apparatus and the polarizing plate manufacturing method according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing an example of an apparatus for producing a polarizing plate according to the present invention.
In the polarizing plate manufacturing apparatus 30 shown in fig. 1, in order along the transport direction, there are provided: adhesive coating devices 33 and 34 for coating an adhesive on one surface of the protective films 31 and 32; a nip roller 36 for superposing the protective films 31 and 32 and the polarizing plate 35; a roller 38 for adhering the laminate 37 to which the protective films 31 and 32 and the polarizing plate 35 are adhered; 1 st active energy ray irradiation devices 39 and 40 provided at positions facing the outer peripheral surface of the roller 38; a 2 nd active energy ray irradiation device 41 provided on the downstream side in the transport direction; and a nip roller 42 for conveyance.
That is, the adhesive is applied to one surface of the protective films 31 and 32 continuously drawn out from the roll-like wound state by the adhesive application devices 33 and 34. The protective films 31 and 32 are respectively overlapped on both surfaces of the polarizing plate 35 continuously drawn out in the same manner as the protective films 31 and 32 by a nip roller 36 via an adhesive, thereby forming a laminated body 37. While the laminate 37 is being conveyed while being adhered to the outer peripheral surface of the roller 38, the adhesive is polymerized and cured by irradiating the outer peripheral surface of the roller 38 with active energy rays from the 1 st active energy ray irradiation devices 39 and 40. The 2 nd active energy ray irradiation device 41 disposed on the downstream side in the conveyance direction is a device for completely polymerizing and curing the adhesive, and can be omitted as necessary.
The method for applying the adhesive to the protective films 31 and 32 is not particularly limited, and various application methods such as a doctor blade, a wire bar (wire bar), a roll and lick type application (die coater), a comma coater, and a gravure printing application can be used. Among these, in the film coating, the adhesive application devices 33 and 34 are preferably gravure rolls in consideration of the degree of freedom with respect to a pass line (pass line), the correspondence with the width, and the like.
When the gravure roll is used as the adhesive coating devices 33 and 34 to coat the adhesive, the thickness of the adhesive layer is adjusted by the draw ratio, which is the ratio of the speed of the gravure roll to the linear speed. The linear speed of the protective films 31, 32 is set to 15 to 50 m/min, the gravure roll is rotated in the direction opposite to the direction of conveyance of the protective films 31, 32, and the speed of the gravure roll is set to 5 to 500 m/min (draw ratio 1 to 10), thereby adjusting the coating thickness of the adhesive layer to about 1 to 10 μm.
The outer peripheral surface of the roller 38 is formed into a convex curved surface by mirror finishing, and the laminate 37 is conveyed while being adhered to the surface, and the adhesive is polymerized and cured by the active energy ray irradiation devices 39 and 40 in the process. The diameter of the roller 38 is not particularly limited as long as the laminate 37 is sufficiently adhered when the adhesive is polymerized and cured, but the laminate 37 with the adhesive layer in an uncured state is preferably 30mJ/cm while passing through the roller 382The cumulative quantity of ultraviolet rays of (1) is irradiated with the active energy rays. The roller 38 may be moved or driven to rotate following the line of the stacked body 37, or may be fixed so that the stacked body 37 slides on its surface.Further, the roller 38 may function as a cooling roller so that heat is not easily added to the laminate 37 when polymerization and solidification are performed by irradiation of an active energy ray. The surface temperature of the cooling roller at this time is preferably 20 to 25 ℃.
The light source used in the polymerization curing by irradiation with active energy rays is not particularly limited, and a light emitting distribution having a wavelength of 400nm or less, for example, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a chemical lamp, an ultraviolet lamp, a microwave excitation mercury lamp, a metal halide lamp, or the like can be used. The intensity of light irradiation to the epoxy resin composition is not particularly limited depending on the intended composition, but the intensity of irradiation in a wavelength region effective for activation of the initiator is preferably 0.1 to 100mJ/cm2. If the intensity of light irradiation to the resin composition is less than 0.1mJ/cm2The reaction time is too long, and if it exceeds 100mJ/cm2Yellowing of the epoxy resin composition and deterioration of the polarizing plate may occur due to heat from lamp radiation and heat generation at the time of polymerization of the composition.
The time for irradiating the composition with the active energy ray is controlled for each polymerized composition, and is not particularly limited, but is preferably set to a cumulative light amount expressed as a product of irradiation intensity and irradiation time of 10 to 5000mJ/cm2. For example, if the cumulative light amount for the above epoxy resin composition is less than 10mJ/cm2Then generation of an activating substance from the initiator is insufficient and curing of the resulting protective film may be insufficient, and on the other hand, if the cumulative light amount exceeds 5000mJ/cm2The irradiation time is very long, which is disadvantageous in improving productivity.
When ultraviolet rays are used as the active energy rays, the linear velocity of the laminate 37 is not particularly limited, but preferably at least 30mJ/cm with a tension of 100 to 800N in the longitudinal direction (conveyance direction)2The laminate 37 is irradiated with the active energy ray under the conditions of the irradiation intensity of 0.3 seconds or more. In addition, when the cumulative light quantity irradiated with the active energy rays by the active energy ray devices 39 and 40 is insufficient, an auxiliary 2 nd active energy ray device 41 may be provided to additionally irradiate the active energy rayThe polymerization of the adhesive of the laminate 37 is completed by the metering.
The polarizing plate thus obtained is less likely to cause reverse curling and wavy curling than the conventional polarizing plate that is conveyed horizontally under a predetermined tension below the active energy ray device (see fig. 3), and therefore, when the polarizing plate is stuck to a liquid crystal cell, no air bubbles remain on the adhesive surface, and the occurrence of defects in the liquid crystal panel can be reduced.
The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples.
Example 1
A75 μm thick amorphous polyolefin resin film [ ZEONOR ] (manufactured by Zeon corporation) and a 80 μm thick triacetylcellulose film [ KC8U2MW ] (manufactured by コニカミノルタ corporation) were prepared. An epoxy resin composition [ KRX492-30] (manufactured by ADEKA corporation) as an adhesive was applied to one surface of each of the amorphous polyolefin resin film and the triacetylcellulose film by a microchamber coater (manufactured by fuji machine) as an adhesive application device. The linear velocity of the laminate was set to 11 m/min, the gravure roll was rotated in the direction opposite to the conveying direction of the laminate, and the speed of the gravure roll was set to 22 m/min, so that the thickness of the adhesive layer was about 2 μm.
Then, the amorphous polyolefin resin film and the triacetyl cellulose film were laminated on both sides of the polyvinyl alcohol film having a thickness of 25 μm and having iodine adsorbed and oriented thereon, with a nip roll, via the epoxy resin composition.
The polarizing plate was adhered to the outer peripheral surface of a cooling roll of 23 ℃ under a tension of 600N in the longitudinal direction, and passed through an EHAN1700NAL high pressure mercury lamp 2 as an ultraviolet lamp provided in an ultraviolet irradiation apparatus (manufactured by GS-YUASA) at a linear velocity of 11 m/min. The cumulative quantity of ultraviolet light at this time was 110 (mJ/cm)2). The cumulative quantity of ultraviolet light is measured by irradiation in the UVB region of a wavelength range of 280 to 320 nm. Then, the laminate with a width direction of 1330mm was aligned in the longitudinal directionThe cut pieces were cut at 600mm, and the degree of wave curling was evaluated by the following method.
That is, as shown in fig. 2, the wave number, wavelength, and amplitude of the polarizing plate 50 facing downward and to which the triacetyl cellulose film was bonded were measured. The wave number is the number of peaks aligned in the width direction of the polarizing plate 50, and as shown in fig. 2(B), the wavelength 51 is the distance between the peaks of the polarizing plate 50 measured. As shown in fig. (a), the amplitude 52 is a length measured between the peaks and valleys at each of positions a to e equally dividing the polarizing plate 50 in the width direction 5, and is a half of the length. The measurement results are shown in fig. 1.
Example 2
Except that the cumulative light amount of the ultraviolet rays was 143 (mJ/cm)2) A polarizing plate was obtained in the same manner as in example 1. The results are shown in Table 1.
Comparative example 1
An epoxy resin composition [ KRX492-32 ] as an adhesive was applied to both surfaces of a polyvinyl alcohol film]A laminate 60 obtained by laminating an amorphous polyolefin resin film and a triacetyl cellulose film (manufactured by ADEKA) was polymerized and cured by passing ultraviolet rays irradiated from an LH10-60UV electrodeless lamp 1, which is an ultraviolet lamp provided in an ultraviolet irradiation device 61 (manufactured by FUSION: フュ - ジョン) at a horizontal line speed of 11 m/min under a tension of 600N without adhering to a roll, as shown in FIG. 3. The cumulative quantity of ultraviolet light at this time was 119 (mJ/cm)2). In addition, a polarizing plate was obtained in the same manner as in example 1. The results are shown in FIG. 1.
Comparative example 2
Except that the cumulative light amount of the ultraviolet rays was 27 (mJ/cm)2) In the same manner as in comparative example 1, a polarizing plate was obtained. The results are shown in Table 1.
TABLE 1
Figure BDA0001054527250000081
As shown in table 1, the polarizing plates of comparative examples 1 and 2 each had wavy curls, and the polarizing plate of comparative example 1 having a larger amount of accumulated ultraviolet light had stronger wavy curls than comparative example 2. On the other hand, the polarizing plates obtained in examples 1 and 2 had a wave number of 0, and the generation of reverse curl and wavy curl was suppressed. In example 1 and example 2, the obtained film was cut into a 20cm × 30cm rectangular shape and set on a flat plate, and the state of the four corners bent (curled) was confirmed, and as a result, no curling was observed at all.

Claims (11)

1. A method for manufacturing a liquid crystal display panel in which the occurrence of wavy curling is suppressed, comprising a method for manufacturing a polarizing plate in which protective films are laminated and bonded to both surfaces of a polarizing plate,
subjecting the surface of the protective film to which the polarizing plate is bonded to an easy adhesion treatment, and superposing the polarizing plate and the protective film with an adhesive therebetween to obtain a laminate, and then adhering the laminate to a convex curved surface formed in an arc shape along the longitudinal direction of the laminate, and curling the laminate on the side of a liquid crystal cell bonded to a liquid crystal display panel to form a protrusion, while irradiating the laminate with an active energy ray to polymerize and cure the adhesive, and conveying the laminate with a conveying nip roller,
the irradiation intensity of the active energy ray is 0.1mJ/cm2～100mJ/cm2。
2. The method for manufacturing a liquid crystal display panel according to claim 1,
the convex curved surface is the outer peripheral surface of the roller.
3. The method for manufacturing a liquid crystal display panel according to claim 2,
the surface temperature of the roller is 20-25 ℃.
4. The method for manufacturing a liquid crystal display panel according to claim 2,
the laminate with the adhesive in an uncured state was passed through the roller at 30mJ/cm2Ultraviolet ray cumulative light quantity irradiation activity ofAn energy line.
5. The method of manufacturing a liquid crystal display panel according to claim 1 or 2,
the polarizer is a polyvinyl alcohol film which is uniaxially stretched and in which iodine or a dichroic dye is adsorbed and oriented, and one of the protective films is an amorphous polyolefin resin film and the other is a triacetyl cellulose film.
6. The method for manufacturing a liquid crystal display panel according to claim 1,
the thickness of the adhesive is 1-10 μm.
7. The method for manufacturing a liquid crystal display panel according to claim 1,
and irradiating the adhesive with active energy rays on the downstream side of the convex curved surface in the conveying direction to completely polymerize and cure the adhesive.
8. An apparatus for manufacturing a liquid crystal display panel having a polarizing plate, in which the occurrence of wavy curling is suppressed, includes:
a mechanism for performing an easy adhesion treatment on the surface of the protective film, which is bonded to the polarizing plate;
a mechanism for coating adhesive on one side of the protective film or both sides of the polarizing plate;
a mechanism for superposing the protective film on both sides of the polarizing plate via an adhesive; and
a mechanism for polymerizing and curing the adhesive, wherein,
the polarizing plate manufacturing apparatus further includes a conveying nip roller for conveying the polarizing plate on the downstream side in the conveying direction of the mechanism for polymerizing and curing the adhesive,
the mechanism for polymerizing and curing the adhesive comprises: a roller for curling the polarizing plate on which the protective film is laminated on one side of the liquid crystal cell attached to the liquid crystal display panel to form a protrusion and conveying the polarizing plate while adhering to the outer peripheral surface of the roller, and an active energy ray irradiation device for irradiating the outer peripheral surface of the roller with active energy rays,
the irradiation intensity of the active energy ray is 0.1mJ/cm2～100mJ/cm2。
9. The manufacturing apparatus of a liquid crystal display panel according to claim 8, wherein the active energy ray irradiation apparatus is an ultraviolet irradiation apparatus.
10. The manufacturing apparatus of liquid crystal display panel according to claim 8,
the adhesive curing apparatus is provided with a 2 nd active energy ray irradiation device which is arranged on the downstream side of the active energy ray irradiation device in the conveying direction and is used for completely curing the adhesive.
11. The manufacturing apparatus of liquid crystal display panel according to claim 8,
the surface temperature of the roller is 20-25 ℃.
CN201610576416.7A 2007-11-30 2008-11-24 Method for manufacturing polarizing plate Active CN106199810B (en)

Applications Claiming Priority (3)

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