JP4147266B1 - Wide polarizing plate and method for producing the same - Google Patents

Wide polarizing plate and method for producing the same Download PDF

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JP4147266B1
JP4147266B1 JP2007170736A JP2007170736A JP4147266B1 JP 4147266 B1 JP4147266 B1 JP 4147266B1 JP 2007170736 A JP2007170736 A JP 2007170736A JP 2007170736 A JP2007170736 A JP 2007170736A JP 4147266 B1 JP4147266 B1 JP 4147266B1
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pva film
polarizing plate
stretching
roll
film
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JP2009008922A (en
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禎造 西
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NISHI INDUSTRY CO., LTD.
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NISHI INDUSTRY CO., LTD.
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Priority to KR1020080053545A priority patent/KR101383517B1/en
Priority to TW097122295A priority patent/TWI430878B/en
Priority to CNA2008101102384A priority patent/CN101334499A/en
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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
    • 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
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/16—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial simultaneously
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets

Abstract

【課題】１００インチ級液晶表示パネルに適用可能な広幅偏光板およびその製法を提供する。
【解決手段】広幅偏光板は、ロールから巻き出されたＰＶＡフィルムにロール幅方向に延伸しロール巻回方向に収縮させる延伸処理を施し、延伸処理後のＰＶＡフィルムの両面をタックフィルムでラミネート処理して製造される。
【選択図】図１A wide polarizing plate applicable to a 100-inch class liquid crystal display panel and a method for manufacturing the same are provided.
A wide polarizing plate is subjected to a stretching process for stretching a PVA film unwound from a roll in a roll width direction and shrinking in a roll winding direction, and laminating both sides of the stretched PVA film with a tack film Manufactured.
[Selection] Figure 1

Description

本発明は、ＰＶＡ（ポリビニルアルコール）を使用した偏光板およびその製法に係り、特に１００インチ級液晶表示パネルに適用可能な広幅偏光板およびその製法に関する。   The present invention relates to a polarizing plate using PVA (polyvinyl alcohol) and a manufacturing method thereof, and more particularly to a wide polarizing plate applicable to a 100 inch class liquid crystal display panel and a manufacturing method thereof.

近年高精細度テレビジョン放送に対応したテレビジョン放送受像装置にあっては画面の大型化が進み、１００インチ級の液晶表示パネルを搭載した受像機も出現している。   In recent years, television broadcast receivers compatible with high-definition television broadcasts have increased in screen size, and receivers equipped with 100-inch class liquid crystal display panels have also appeared.

液晶表示パネルは、背面から前面に向かって、白色光を発光するバックライト、バックライトの発光した白色光を第１の方向（例えば縦方向）の偏光に変換する第１の偏光板、第１の透明電極、液晶、第２の透明電極、および第１の方向と直交する第２の方向（例えば横方向）の偏光だけを透過する第２の偏光板を順次積層した構造を有する。   The liquid crystal display panel includes a backlight that emits white light from the back to the front, a first polarizing plate that converts white light emitted from the backlight into polarized light in a first direction (for example, a vertical direction), and a first polarizing plate. A transparent electrode, a liquid crystal, a second transparent electrode, and a second polarizing plate that transmits only polarized light in a second direction (for example, a lateral direction) orthogonal to the first direction.

バックライトの発光した白色光は、第１の偏光板で縦偏光に変換されて液晶層に入射する。   White light emitted from the backlight is converted into longitudinally polarized light by the first polarizing plate and enters the liquid crystal layer.

第１の透明電極と第２の透明電極との間に電圧が印加されていない場合は、縦偏光は縦偏光のまま液晶層を透過し第２の偏光板に入射するが、第２の偏光板は横偏光だけを透過する性質を有するため、縦偏光は遮蔽され、バックライト光は表示面に暗点を表示する。   When no voltage is applied between the first transparent electrode and the second transparent electrode, the vertically polarized light passes through the liquid crystal layer and remains incident on the second polarizing plate. Since the plate has a property of transmitting only the laterally polarized light, the vertically polarized light is shielded, and the backlight light displays a dark spot on the display surface.

逆に、第１の透明電極と第２の透明電極との間に電圧が印加された場合は、縦偏光は液晶層を通過する間に横偏光に変換され第２の偏光板を透過するため、バックライト光は表示面に明点を表示することとなる。   Conversely, when a voltage is applied between the first transparent electrode and the second transparent electrode, the longitudinally polarized light is converted into laterally polarized light while passing through the liquid crystal layer and is transmitted through the second polarizing plate. The backlight light displays a bright spot on the display surface.

上記の液晶表示パネルに使用する偏光板としては、ＰＶＡ偏光板を使用することが一般的である。   As a polarizing plate used for the liquid crystal display panel, a PVA polarizing plate is generally used.

本出願人は、ＰＶＡフィルムを膨潤し、ヨウ素を染着した後、ＰＶＡフィルムを巻回方向に延伸させるとともに幅方向に収縮させる延伸処理を施して偏光性を付与し、両面をタックフィルムでラミネートすることにより、ＰＶＡ偏光板を製造する方法を既に提案している（例えば、特許文献１参照）。   The present applicant swells the PVA film and dyes iodine, and then applies a polarizing treatment by stretching the PVA film in the winding direction and contracting in the width direction, and laminates both sides with a tack film. Thus, a method for producing a PVA polarizing plate has already been proposed (see, for example, Patent Document 1).

延伸処理前のＰＶＡフィルムの幅をＷ、長さをＨとし、延伸処理後のＰＶＡフィルムの幅をｗ、長さをｈとすると、次の式を満足するように延伸処理を行えば９９．９９％以上の偏光率、４３％以上の透過率を有する偏光板を製造できることが知られている。   If the width of the PVA film before the stretching process is W, the length is H, the width of the PVA film after the stretching process is w, and the length is h, the stretching process is performed so as to satisfy the following formula. It is known that a polarizing plate having a polarization rate of 99% or more and a transmittance of 43% or more can be produced.

ｗ＝Ｗ／２
ｈ＝５．５Ｈ
即ち、ＰＶＡフィルム巻回方向に５．５倍延伸することにより液晶表示パネルに適用可能な偏光率９９．９９％以上、透過率４３％以上の偏光板を製造することができるが、偏光板の幅は延伸処理前のＰＶＡフィルムの幅の半分に収縮することとなる。 w = W / 2
h = 5.5H
That is, a polarizing plate having a polarizing ratio of 99.99% or more and a transmittance of 43% or more that can be applied to a liquid crystal display panel by stretching 5.5 times in the PVA film winding direction can be produced. The width will shrink to half the width of the PVA film before stretching.

現在ＰＶＡ製造者から調達可能なＰＶＡフィルムロールの最大幅は３１００ミリメートルであるため、現在製造可能な偏光板の最大幅は３１００÷２＝１５５０ミリメートルとなる。   Since the maximum width of the PVA film roll that can be procured from the PVA manufacturer at present is 3100 millimeters, the maximum width of the polarizing plate that can be currently produced is 3100/2 = 1550 millimeters.

ところが、１００インチ級の液晶表示パネルには、幅２３００ミリメートル、高さ１３００ミリメートルの縦方向偏光板および横方向偏光板が必要となる。   However, a 100-inch class liquid crystal display panel requires a longitudinal polarizing plate and a lateral polarizing plate having a width of 2300 millimeters and a height of 1300 millimeters.

図４は幅１５５０ミリメートルの偏光板ロール５０から幅２３００ミリメートル、高さ１３００ミリメートルの縦方向偏光板および横方向偏光板を裁断する場合の裁断図であって、横方向偏光板５１は継ぎ目なしで製造可能であるものの、縦方向偏光板５２は少なくとも１箇所の継ぎ目があるものとせざるを得なかった。
特開２００２−３５０６３８公報（［０００９］、図３） FIG. 4 is a cutting diagram in the case of cutting a longitudinally polarizing plate and a laterally polarizing plate having a width of 2300 millimeters and a height of 1300 millimeters from a polarizing plate roll 50 having a width of 1550 millimeters. Although it can be manufactured, the longitudinally polarizing plate 52 has to have at least one joint.
JP 2002-350638 A ([0009], FIG. 3)

しかしながら、縦方向偏光板の継ぎ目からバックライト光が漏洩することを回避できないため、１００インチ級の液晶表示パネルでは縦方向に細い白線が生じ、画質の劣化を招来するという課題があった。   However, it is unavoidable that backlight light leaks from the joints of the vertical polarizing plates. Therefore, in the 100-inch liquid crystal display panel, a thin white line is generated in the vertical direction, causing deterioration in image quality.

本発明は、上記従来の課題を解決するものであって、１００インチ級液晶表示パネルに適用可能な広幅偏光板およびその製法を提供することを目的とする。   The present invention solves the above-described conventional problems, and an object thereof is to provide a wide polarizing plate applicable to a 100-inch class liquid crystal display panel and a manufacturing method thereof.

本発明に係る広幅偏光板の製造方法は、ロールから送り出されたＰＶＡフィルムをロール幅方向に延伸しロール巻回方向に収縮させる延伸処理段階と、前記延伸処理後の前記ＰＶＡフィルムの両面をタックフィルムでラミネートするラミネート処理段階とを含む。   The method for producing a wide polarizing plate according to the present invention includes a stretching process step of stretching a PVA film fed from a roll in the roll width direction and contracting in the roll winding direction, and tacking both surfaces of the PVA film after the stretching process. Laminating with a film.

これにより、広幅の偏光板を製造できることとなる。   Thereby, a wide polarizing plate can be manufactured.

本発明に係る広幅偏光板の製造方法は、前記延伸処理段階が、延伸槽において、前記ＰＶＡフィルムの両側端を把持手段で把持して前記ＰＶＡフィルムをロール幅方向に延伸し、前記ＰＶＡフィルムの前記延伸槽からの排出速度を前記ＰＶＡフィルムの前記延伸槽への供給速度より小として前記ＰＶＡフィルムをロール巻き出し方向に収縮させる２軸同時延伸処理段階である。   In the method for producing a wide polarizing plate according to the present invention, in the stretching step, in the stretching tank, the PVA film is stretched in the roll width direction by gripping both side ends of the PVA film with gripping means. This is a biaxial simultaneous stretching treatment stage in which the discharge speed from the stretching tank is made lower than the feeding speed of the PVA film to the stretching tank, and the PVA film is contracted in the roll unwinding direction.

これにより、連続で広幅偏光板を製造することができる。   Thereby, a wide-width polarizing plate can be manufactured continuously.

本発明に係る広幅偏光板の製造方法は、前記２軸同時延伸処理段階が、前記ＰＶＡフィルムを幅方向に５．５倍延伸し、前記ＰＶＡフィルをロール巻回方向に半分に収縮させる処理である。   In the method for producing a wide polarizing plate according to the present invention, the biaxial simultaneous stretching treatment step is a treatment of stretching the PVA film 5.5 times in the width direction and shrinking the PVA film in half in the roll winding direction. is there.

これにより、偏光率が９９．９９％以上、透過率が４３％以上の広幅偏光板を製造することができる。   Thereby, a wide polarizing plate having a polarization rate of 99.99% or more and a transmittance of 43% or more can be produced.

本発明に係る広幅偏光板の製造方法は、ラミネート処理が、前記延伸処理後の前記ＰＶＡフィルムの両側端を把持手段で把持した状態で前記タックフィルムをラミネートする処理である。   In the manufacturing method of the wide polarizing plate according to the present invention, the laminating process is a process of laminating the tack film in a state where both side ends of the PVA film after the stretching process are gripped by gripping means.

これにより、ＰＶＡフィルムに皺を生じることなくラミネートすることができる。   Thereby, it can laminate without producing a wrinkle in a PVA film.

本発明は、ロールから巻き出されたＰＶＡフィルムにロール幅方向に延伸しロール巻き出し方向に収縮させる延伸処理を施し、延伸処理後のＰＶＡフィルムの両面をタックフィルムでラミネート処理して製造することにより、１００インチ級液晶表示パネルに適用できる偏光板を製造できるという効果を有する広幅偏光板を提供することができるものである。   In the present invention, a PVA film unwound from a roll is stretched in the roll width direction and contracted in the roll unwinding direction, and both sides of the PVA film after the stretching process are laminated with a tack film to produce the PVA film. Accordingly, it is possible to provide a wide polarizing plate having an effect that a polarizing plate applicable to a 100-inch class liquid crystal display panel can be manufactured.

以下、本発明に係る偏光板の製造方法の実施形態について、図面を用いて説明する。   Hereinafter, an embodiment of a method for producing a polarizing plate according to the present invention will be described with reference to the drawings.

図１は、本発明に係る広幅偏光板製造装置１の上面図（Ａ）および側面図（Ｂ）である。   FIG. 1 is a top view (A) and a side view (B) of a wide polarizing plate manufacturing apparatus 1 according to the present invention.

図２は本発明に係る広幅偏光板製造工程を示す流れ図であって、本発明に係る広幅偏光板は以下の工程を経て製造される。
１．ＰＶＡフィルム巻き出し装置１１から巻き出されたＰＶＡフィルム１０を、水洗槽１２内で水洗する。
２．水洗したＰＶＡフィルム１０を、膨潤槽１３内で膨潤する。
３．膨潤したＰＶＡフィルム１０に、染色槽１４内においてヨウ素で染色する。
４．ヨウ素で染色されたＰＶＡフィルム１０を、ホウ酸水溶液を満たした洗浄槽１５内で洗浄する。
５．洗浄されたＰＶＡフィルム１０を、延伸槽２において液体雰囲気中で２軸同時延伸処理する。 FIG. 2 is a flowchart showing a wide polarizing plate manufacturing process according to the present invention. The wide polarizing plate according to the present invention is manufactured through the following steps.
1. The PVA film 10 unwound from the PVA film unwinding device 11 is washed with water in the water washing tank 12.
2. The washed PVA film 10 is swollen in the swelling tank 13.
3. The swollen PVA film 10 is dyed with iodine in the dyeing tank 14.
4). The PVA film 10 dyed with iodine is washed in a washing tank 15 filled with an aqueous boric acid solution.
5. The washed PVA film 10 is subjected to biaxial simultaneous stretching in a stretching tank 2 in a liquid atmosphere.

２軸同時延伸処理では、ＰＶＡフィルム１０の両側端を把持手段の１実施例である把持具２１で把持してＰＶＡフィルム１０を幅方向に延伸するとともに、延伸槽２からのＰＡＶフィルム１０の排出速度を延伸槽２へのＰＶＡフィルム１０の供給速度より低速としてＰＶＡフィルム１０を巻回方向に収縮して、架橋状態を維持したまま、ＰＶＡ分子およびヨウ素を幅方向に配向してＰＶＡフィルム１０に偏光性を付与する。   In the biaxial simultaneous stretching process, both ends of the PVA film 10 are gripped by the gripping tool 21 which is one embodiment of the gripping means, the PVA film 10 is stretched in the width direction, and the PAV film 10 is discharged from the stretching tank 2. The PVA film 10 is contracted in the winding direction at a speed lower than the supply speed of the PVA film 10 to the stretching tank 2, and the PVA molecules and iodine are oriented in the width direction while maintaining the cross-linked state. Gives polarization.

なお、９９．９９％以上の偏光率および４３％以上の透過率を実現するためには、ＰＶＡフィルムを幅方向に５．５倍以上に延伸する必要がある。   In order to realize a polarization rate of 99.99% or more and a transmittance of 43% or more, the PVA film needs to be stretched by 5.5 times or more in the width direction.

そして、幅方向に５．５倍以上に延伸した場合にＰＶＡフィルムが裂けることを防止するために、ＰＶＡフィルムを巻回方向に半分に収縮させることが必要となる。   And in order to prevent a PVA film from tearing when it extends | stretches 5.5 times or more to the width direction, it is necessary to shrink | contract a PVA film in half to the winding direction.

従って、延伸槽２からのＰＡＶフィルム１０の取り出し速度を延伸槽２へのＰＶＡフィルム１０の供給速度の半分に制御することが必要となる。
６．延伸処理したＰＶＡフィルム１０を、脱水装置１６で脱水する。
７．脱水後のＰＶＡフィルム１０を、第１の乾燥装置１７で乾燥する。
８．ラミネート装置３において、乾燥後のＰＶＡフィルム１０の両面をタックフィルム巻き出し装置３１から巻き出されたタックフィルム３２でラミネートする。 Therefore, it is necessary to control the take-off speed of the PAV film 10 from the drawing tank 2 to half the supply speed of the PVA film 10 to the drawing tank 2.
6). The stretched PVA film 10 is dehydrated by a dehydrator 16.
7). The dehydrated PVA film 10 is dried by the first drying device 17.
8). In the laminating apparatus 3, both sides of the dried PVA film 10 are laminated with the tack film 32 unwound from the tack film unwinding apparatus 31.

ラミネートする際には、撓み、緩み等が発生しないようにＰＶＡフィルム１０に張力を加えた状態にしておく必要がある。しかし、ＰＶＡフィルム１０をＰＶＡ分子の配向方向の直交方向（即ち、ＰＶＡフィルム１０の巻回方向）に張力をかけ過ぎるとＰＶＡフィルム１０は幅方向に裂けることを回避できない。   When laminating, it is necessary to keep the PVA film 10 in a tensioned state so as not to bend or loosen. However, if the PVA film 10 is excessively tensioned in the direction perpendicular to the orientation direction of the PVA molecules (that is, the winding direction of the PVA film 10), the PVA film 10 cannot be prevented from being split in the width direction.

そこで、本発明に係る偏光板の製造方法にあっては、延伸処理において使用した把持具２１でＰＶＡフィルム１０の両側端を把持したまま、脱水、乾燥およびラミネート処理を行い、ラミネート処理後に把持具２１を取り外すようにしている。
９．ラミネート後のＰＶＡフィルム１０を、第２の乾燥装置１８で乾燥する。
１０．トリミング装置４において、耳切り装置４１によって乾燥後のＰＶＡフィルム１０の両側端の耳を切り落とす。なお、切り落とされた耳屑は耳屑巻き取り装置４２で巻き取られる。
１１．トリミング後のＰＶＡフィルム１０を巻き取り装置１９でロール状に巻き取り、偏光板ロールとする。 Therefore, in the method for manufacturing a polarizing plate according to the present invention, dehydration, drying and laminating processes are performed while holding both side ends of the PVA film 10 with the gripping tool 21 used in the stretching process. 21 is removed.
9. The laminated PVA film 10 is dried by the second drying device 18.
10. In the trimming device 4, the ears on both sides of the dried PVA film 10 are cut off by the ear clip device 41. The trimmed eardust is taken up by the eardust take-up device 42.
11. The trimmed PVA film 10 is wound into a roll by a winder 19 to obtain a polarizing plate roll.

以上説明したように、本発明に係る偏光板の製造方法によれば、延伸処理前の幅が４２０ミリメートルのＰＶＡフィルムを使用して幅２３００ミリメートルの偏光板を作成することができることとなる。   As described above, according to the method for producing a polarizing plate according to the present invention, a polarizing plate having a width of 2300 mm can be produced using a PVA film having a width of 420 mm before the stretching treatment.

図３は、本発明に係る偏光板の製造方法により製造した偏光板ロールから１００インチ級の液晶表示装置に使用する偏光板を裁断する場合の裁断図であって、１００インチ級の液晶表示装置に使用する幅２３００ミリメートル、高さ１３００ミリメートルの横方向偏光板２２および縦方向偏光板２３を継ぎ目無しで製造することが可能となる。   FIG. 3 is a cutting diagram for cutting a polarizing plate used in a 100-inch class liquid crystal display device from a polarizing plate roll manufactured by the polarizing plate manufacturing method according to the present invention, and is a 100-inch class liquid crystal display device. The horizontal polarizing plate 22 and the vertical polarizing plate 23 having a width of 2300 millimeters and a height of 1300 millimeters used in the above can be manufactured without a seam.

さらに、現在入手可能な最大幅である幅３１００ミリメートルのＰＶＡフィルムを使用すれば、１７０００ミリメートル幅の偏光板を継ぎ目無しで製造することも可能となる。   Furthermore, if a PVA film having a width of 3100 millimeters, which is the maximum width currently available, is used, a polarizing plate having a width of 17000 millimeters can be produced without a seam.

以上のように、本発明に係る広幅偏光板およびその製法は、１００インチ級の液晶表示装置に使用可能な広幅偏光板を継ぎ目無しで製造できるという効果を有する。   As described above, the wide polarizing plate and the method for producing the same according to the present invention have an effect that a wide polarizing plate that can be used for a 100-inch class liquid crystal display device can be produced without a seam.

本発明に係る広幅偏光板製造装置の上面図（Ａ）および側面図（Ｂ）Top view (A) and side view (B) of wide polarizing plate manufacturing apparatus according to the present invention 本発明に係る広幅偏光板製造工程を示す流れ図Flow chart showing wide polarizing plate manufacturing process according to the present invention 本発明に係る偏光板の製造方法により製造した偏光板ロールから１００インチ級の液晶表示装置に使用する偏光板を裁断する場合の裁断図Cutting diagram for cutting a polarizing plate for use in a 100 inch liquid crystal display device from a polarizing plate roll produced by the method for producing a polarizing plate according to the present invention. 幅１５５０ミリメートルの偏光板ロールから幅２３００ミリメートル、高さ１３００ミリメートルの縦方向偏光板および横方向偏光板を裁断する場合の裁断図Cutting diagram when cutting a longitudinal polarizing plate and a lateral polarizing plate having a width of 2300 mm and a height of 1300 mm from a polarizing plate roll having a width of 1550 mm

符号の説明Explanation of symbols

１ 広幅偏光板製造装置
１０ ＰＶＡフィルム
１１ ＰＶＡフィルム巻き出し装置
１２ 水洗槽
１３ 膨潤槽
１４ 染色槽
１５ 洗浄槽
１６ 脱水装置
１７ 第１の乾燥装置
１８ 第２の乾燥装置
１９ 巻き取り装置
２ 延伸槽
２１ 把持具
３ ラミネート装置
３１ タックフィルム巻き出し装置
３２ タックフィルム
４ トリミング装置
４１ 耳切り装置
４２ 耳屑巻き取り装置 DESCRIPTION OF SYMBOLS 1 Wide polarizing plate manufacturing apparatus 10 PVA film 11 PVA film unwinding apparatus 12 Washing tank 13 Swelling tank 14 Dyeing tank 15 Washing tank 16 Dehydrating apparatus 17 1st drying apparatus 18 2nd drying apparatus 19 Winding apparatus 2 Stretching tank 21 Gripping tool 3 Laminating device 31 Tack film unwinding device 32 Tack film 4 Trimming device 41 Ear cutting device 42 Ear waste winding device

Claims (4)

ロールから送り出されたＰＶＡフィルムをロール幅方向に延伸しロール巻回方向に収縮させる延伸処理段階と、A stretching process step of stretching the PVA film fed from the roll in the roll width direction and contracting in the roll winding direction;
前記延伸処理後の前記ＰＶＡフィルムの両面をタックフィルムでラミネートするラミネート処理段階とを含む広幅偏光板の製造方法。And a laminating step of laminating both surfaces of the PVA film after the stretching treatment with a tack film. 前記延伸処理段階が、延伸槽において、前記ＰＶＡフィルムの両側端を把持手段で把持して前記ＰＶＡフィルムをロール幅方向に延伸し、前記ＰＶＡフィルムの前記延伸槽からの排出速度を前記ＰＶＡフィルムの前記延伸槽への供給速度より小として前記ＰＶＡフィルムをロール巻き出し方向に収縮させる２軸同時延伸処理段階である請求項１に記載の広幅偏光板の製造方法。In the stretching tank, the stretching process step grips both ends of the PVA film with gripping means, stretches the PVA film in the roll width direction, and sets the discharge rate of the PVA film from the stretching tank to that of the PVA film. 2. The method for producing a wide polarizing plate according to claim 1, wherein the PVA film is contracted in a roll unwinding direction at a speed lower than a supply speed to the stretching tank, and is a biaxial simultaneous stretching treatment stage. 前記２軸同時延伸処理段階が、前記ＰＶＡフィルムを幅方向に５．５倍延伸し、前記ＰＶＡフィルムをロール巻回方向に半分に収縮させる処理である請求項２に記載の広幅偏光板の製造方法。The production of the wide polarizing plate according to claim 2, wherein the biaxial simultaneous stretching treatment step is a treatment of stretching the PVA film 5.5 times in the width direction and shrinking the PVA film in half in the roll winding direction. Method. ラミネート処理が、前記延伸処理後の前記ＰＶＡフィルムの両側端を把持手段で把持した状態で前記タックフィルムをラミネートする処理である請求項２または請求項３に記載の広幅偏光板の製造方法。The method for producing a wide polarizing plate according to claim 2 or 3, wherein the laminating process is a process of laminating the tack film in a state where both side ends of the PVA film after the stretching process are gripped by gripping means.
JP2007170736A 2007-06-28 2007-06-28 Wide polarizing plate and method for producing the same Expired - Fee Related JP4147266B1 (en)

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KR1020080053545A KR101383517B1 (en) 2007-06-28 2008-06-09 Fabrication method of wide width polarizing plate
TW097122295A TWI430878B (en) 2007-06-28 2008-06-13 Wide polarizing plate and its preparation method
CNA2008101102384A CN101334499A (en) 2007-06-28 2008-06-18 Wide polarizing plate and manufacturing method thereof

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