CN102029710A - Method for manufacturing optical film, optical film, liquid crystal display device and image display device - Google Patents
Method for manufacturing optical film, optical film, liquid crystal display device and image display device Download PDFInfo
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- CN102029710A CN102029710A CN2010102988421A CN201010298842A CN102029710A CN 102029710 A CN102029710 A CN 102029710A CN 2010102988421 A CN2010102988421 A CN 2010102988421A CN 201010298842 A CN201010298842 A CN 201010298842A CN 102029710 A CN102029710 A CN 102029710A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0073—Optical laminates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J129/00—Adhesives based on 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; Adhesives based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Adhesives based on derivatives of such polymers
- C09J129/02—Homopolymers or copolymers of unsaturated alcohols
- C09J129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- 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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- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Mechanical Engineering (AREA)
- Polarising Elements (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
Provided is a method for manufacturing an optical film, where the possibility of fracture at jointed parts caused by stretching is low even if multiple jointed films are continuously stretched in the conveying direction. A film 36a is sent out and is stretched in a stretching groove 10 in the conveying direction. When the supply of the film 36a is finished, the rear end of the film 36a is jointed with the front end of a film 40a. At this time, a jointed part is formed, and a joint angle formed between the jointed part and a direction perpendicular to the stretching direction ranges from 10 DEG to 60 DEG. Finally, the film 40a is sent out and is stretched in the stretching groove 10 towards the conveying direction.
Description
Technical field
The present invention relates to manufacture method, blooming, liquid crystal indicator and the image display device of blooming.
Background technology
Use blooming in the image display device etc.Particularly use polarizer in liquid crystal indicator, electroluminescent (EL) display unit.Manufacture method as polarizer, it is known to the leading section of reel film is sent into stretching device from the reel film that the polyvinyl alcohol reel film with band shape is rolled into the formation of roller shape, the predetermined process limit is carried out on the limit makes it stretch the method for making (patent documentation 1,2).
Usually the treatment process of blooming is made of a plurality of treatment troughs.Making rectangular film is that hand is directly inserted in the bath by the operation of the deflector roll in the treatment trough, is undertaken by manual operations for a long time, or uses conductor rope to carry out.So, have the problem of operability and production efficiency difference.
In order to address this problem, proposed the rear end of reel film that will go ahead of the rest by heat-sealing and the front end of follow-up reel film and engaged, the junction surface is cut into circular-arc, prevent wide inhomogeneities of film or junction surface fracture (patent documentation 3,4) in stretching process thus.
[prior art document]
[patent documentation]
[patent documentation 1] spy opens the 2008-122988 communique
[patent documentation 2] spy opens the 2008-250326 communique
[patent documentation 3] spy opens the 2009-040034 communique
[patent documentation 4] spy opens the 2009-051202 communique
Summary of the invention
But, engage reel (former anti-) rear end of film and the front end of follow-up reel film and the junction surface cut into circular-arc method by heat-sealing suppress the wide inhomogeneities of film, junction surface fracture and insufficient in the stretching process in advance.Particularly when the aspect of performance of polarizer need to consider high stretching ratio (A-stage 5～7 times), the problem that exists the junction surface to rupture easily.
The present invention is in view of above-mentioned thing, though order be to provide engaged a plurality of symphysis are continued at carriage direction and stretch, produce the manufacture method that causes the also low blooming of the possibility that ruptures by stretching at the junction surface.
According to an embodiment of the invention, the manufacture method of blooming is characterised in that and comprises following operation: the rear end of the first polyvinyl alcohol film and the front end of the second polyvinyl alcohol film are engaged, to form the operation at junction surface in the mode below 60 ° more than 20 ° with the engagement angles that constitutes perpendicular to the direction of draw direction, follow the described first polyvinyl alcohol film and send the operation of the described second polyvinyl alcohol film, the engaged described first polyvinyl alcohol film and the described second polyvinyl alcohol symphysis are continued in stretch 3～8 times operation of carriage direction.
Further investigations such as inventor in the stretching process of polyvinyl alcohol film the junction surface and near at the fracture characteristics at the junction surface that distortion (inhomogeneities that film is wide), the particularly inhomogeneities of film cross direction causes.The polyvinyl alcohol film is stretched 3～8 times the time at carriage direction, and banded film shrinks at width.But, even with the polyvinyl alcohol film when carriage direction stretches, also shrink hardly at width at the junction surface.Therefore, when forming the junction surface along the direction perpendicular to draw direction, the zone that has formed the junction surface on the banded film is wide remarkable different with other regional films.And, find inhomogeneities or fracture that this difference causes that film is wide.
According to the present invention,, be that the mode below 60 ° is formed obliquely more than 20 ° with engagement angles with respect to the direction vertical with draw direction with the junction surface that the front end of the rear end of the first polyvinyl alcohol film and the second polyvinyl alcohol film engages.The film cross direction composition (vector) at junction surface is reduced with the engagement angles increase.Even the engaged first polyvinyl alcohol film and the second polyvinyl alcohol symphysis are being continued under the situation that carriage direction stretches, formed the zone at junction surface and the contraction difference in other zones and also reduced.The result can suppress the fracture of wide inhomogeneities of film or film.
The engagement angles at junction surface is big more, and the effect that suppresses wide inhomogeneities of film and film fracture is big more.In a word, need only 90 ° of less thaies in theory.On the other hand, if engagement angles is excessive, equipment that then is used to form the junction surface etc. is excessive.Therefore, the upper limit of engagement angles is preferably below 60 °.Engagement angles is preferred more than 20 ° below 60 °, more preferably more than 30 ° below 60 °.
In the manufacture method of blooming of the present invention, preferably before above-mentioned stretching process, have circular-arc operation is cut at the two ends at above-mentioned junction surface.Circular-arc by the two ends at junction surface are cut into, can improve the anti-breaking property when stretching.
In blooming manufacture method of the present invention, preferably in that being cut in the circular-arc operation, the two ends at above-mentioned junction surface satisfy following formula.
0.01≤(1-(L/W0)) * 100≤29 (W0: cut off the length of cephacoria cross direction, L: the length of cutting off the film cross direction composition at junction surface, back)
In blooming manufacture method of the present invention, preferably form above-mentioned junction surface by thermal welding.
As joint method,, also utilize double-sided adhesive tape to carry out adhesive joint except that utilizing above-mentioned thermal welding (ripe melting) engages.But, when carrying out stretch processing in solution tank as polarizer manufacturing process, adhesive layer takes place easily peel off, adhesive joint is not preferred.Herein, thermal welding is meant and utilizes heat sealing machine or ultrasonic wave to heat and pressurize, and resin is softening, on other materials.
In the manufacture method of blooming of the present invention, preferably before forming above-mentioned junction surface, further comprise the operation that the front end of the rear end of the above-mentioned first polyvinyl alcohol film and the above-mentioned second polyvinyl alcohol film is cut into roughly the same engagement angles.
The unwanted part of the rear end by excising the first polyvinyl alcohol film and the front end of the second polyvinyl alcohol film can be carried out transporting of polyvinyl alcohol film smoothly.
Blooming of the present invention is characterised in that it is that manufacture method by above-mentioned record is made.
Liquid crystal indicator of the present invention is characterised in that and comprises above-mentioned blooming.
Image display device of the present invention is characterised in that and comprises above-mentioned blooming.
Manufacturing method according to the invention also can suppress the fracture at junction surface even engaged polyvinyl alcohol symphysis continued to stretch at carriage direction.
Description of drawings
The pie graph of the manufacturing circuit of [Fig. 1] expression blooming.
The plane of the configuration of [Fig. 2] expression film and engagement device.
The key diagram of the joint action of [Fig. 3] expression film.
The plane of the position relation at [Fig. 4] expression film and junction surface.
[Fig. 5] expression is with the plane of the state of two ends, junction surface cut-out.
[Fig. 6] expression engagement angles, film is wide, the plane of the relation of the width at junction surface.
[Fig. 7] gathered the chart of condition and evaluation result.
Symbol description
1 ... make circuit, 2 ... film supply unit, 4 ... swelling groove, 6 ... staining trough, 8 ... dura mater groove, 10 ... stretch slot, 12 ... revise groove, 14 ... drying device, 16 ... stacked laminator, 18 ... film coiler device, 24 ... turret apparatus (タ one レ Star ト device), 26 ... engagement device, 28 ... accumulate (ア キ ユ one system) device, 36a ... film, 36b ... first film volume, 40a ... film, 40b ... second film volume, 80 ... the junction surface
The specific embodiment
Following with reference to description of drawings preferred implementation of the present invention.By following preferred implementation explanation the present invention, but can not depart from the scope of the present invention, change, can utilize present embodiment other embodiments in addition by multiple gimmick.Therefore, the whole changes in the scope of the invention are included within the claim scope.
Below, with reference to the accompanying drawings, the preferred implementation of blooming manufacture method of the present invention is described.As blooming is that example describes with the light polarizing film.Fig. 1 is the formation sketch that is used to make the manufacturing circuit of blooming.Make circuit 1 and have film supply unit 2, film handling part 3, film drying section 14, laminated section 16, film coiling portion 18.Herein, film supply unit 2 engagement device 26, the accumulation device 28 that comprise the turret apparatus 24 that keeps a plurality of films volumes, the film of going ahead of the rest and follow-up film are engaged.
Turret apparatus 24 has capstan head arm 30.Capstan head arm 30 is that fulcrum can be rotatably set on the pillar 32 with axle 34.At an end of capstan head arm 30, film 36a is made first film volume 36b that web-like obtains rotatably be supported on the axle 38.As shown in the figure, first film volume 36b is placed in film and supplies with the position.At the other end of capstan head arm 30, film 40a is made second film volume 40b that web-like obtains rotatably be supported on the axle 42.From first film volume 36b delivery film 36a.When first film volume 36b has supplied with film 36a, 30 rotations of capstan head arm.Second film volume 40b is moved, be placed in film and supply with the position.From second film volume 40b delivery film 40a.During delivery film 40a, first film volume 36b is installed in an end of capstan head arm 30.Implement aforesaid operations repeatedly, continuously delivery film 36a, 40a.
As shown in Figure 1, accumulation device 28 possesses stationary roll 50 and mobile rollers 52.By mobile rollers 52 is moved up and down, can adjust film and engage the required time etc.
The joint sequency of present embodiment is described below with reference to Fig. 1～Fig. 3.The 1st, from film supply unit 2 film 36a is supplied to the swelling groove 4.Film 36a is transported in swelling groove 4, staining trough 6, dura mater groove 8, stretch slot 10, the rinse bath 12.Film 36a passes through the niproll 39a of film handling part 3 to 3～8 times of carriage direction stretchings during by each groove.It is about 10 quality % that film 36a is dried to amount of moisture by drying device 14.The film 36a that is dried passes through laminated section 16 at two sides applying diaphragm 64a.Film 36a is wound into web-like by film coiling portion 18.
Then, when finishing, the rear end of film 36a is placed engagement device 26 from first film volume 36b delivery film 36a.Need to prove, in swelling groove 4, transport to be accommodated in and transport film 36a on the accumulation device 28.Therefore, need not stop in each groove, to transport film and the rear end of film 36a can be placed engagement device 26.
Supply with first film volume 36b is finished, rotation capstan head arm 30, and 40b places film to supply with the position with second film volume.By second film volume 40b delivery film 40a.Film 40a is transported to engagement device 26.The front end of film 40a is placed on the engagement device 26.
When the front end of the rear end of film 36a and film 40a is located,, add the rear end of press mold 36a and the front end of film 40a by bearing platform 44 and heated end socket 46 on engagement device 26.Thus with film 36a and film 40a thermal welding.In the present embodiment, engagement device 26 is to be obliquely installed below 60 ° more than 20 ° with respect to the direction vertical with the carriage direction (being the draw direction of film) of film 36a, 40a as shown in Figure 2.
As a result, as shown in Figure 4, the junction surface 80 that is formed on the front end of the rear end of film 36a and film 40a forms engagement angles θ 1 more than 20 ° below 60 °.Condition during as thermal welding, about 200 ℃ of preferred temperature.This is that thermal welding is insufficient because under 150 ℃, and in the time of 250 ℃, the excessive fusion of film can not fully keep the intensity at junction surface.Comprising the cool time after the heating, required time is preferably 2 seconds～and 10 seconds.Under 0.2～0.8MPa, pressurize.
And then, in the present embodiment, preferably at film supply unit 2, configuration film clipper (not having diagram) before engagement device 26.By the film clipper, can be with the rear end of film 36a and front end edge engagement angles θ 1 excision of film 40a.Then, the rear end of film 36a and the front end of film 40a are engaged by engagement device 20.Because with the rear end of film 36a and front end edge engagement angles θ 1 excision of film 40a, do not have remainder at film 36a, 40a in advance so engage the back.
Herein, remainder is meant as shown in Figure 4, is junction surface 80 and the zone of arriving the rear end of film 36a for the film 36a that goes ahead of the rest, and is junction surface 80 and the zone of arriving the front end of film 40a for follow-up film 40a.Because above-mentioned remainder is not fixed, so shake sometimes in the transporting of film.This may influence transporting smoothly of film.Therefore, preferably excise the remainder of film in advance.
The manufacture method of the blooming of present embodiment with the front end of the rear end of film 36a and film 40a by engaging at the junction surface below 60 ° more than 20 ° with engagement angles that direction perpendicular to draw direction constitutes, import film handling part 3 in turn continuously, the limit is implemented the predetermined process limit and is made its stretching, makes blooming.
Fig. 5 represents state that the front end of the rear end of the film of will go ahead of the rest and follow-up film engages and circular-arc state is cut at the two ends at junction surface.Be used for junction surface 80 that the front end with the rear end of film 36a and film 40a engages and be formed engagement angles θ 1 more than 20 ° below 60 °.In the present embodiment, excise the rear end of film 36a and the front end of film 40a by the film clipper along engagement angles θ 1.Junction surface 80 is cut into circular-arc at its two ends.Circular-arc by being cut into, the anti-breaking property that stretches that results from improves.Its reason is described.Suppose the rear end of film 36a and the front end (Fig. 5 (A)) when the film cross direction staggers of film 40a, stress concentrates on this part.By the two ends at junction surface being cut into circular-arc (Fig. 5 (B)), avoided the rear end of film 36a and the front end of film 40a to stagger at the film cross direction.Can prevent that thus stress from concentrating on the both ends at junction surface.Therefore, the two ends at junction surface are cut into when circular-arc, get final product so long as can eliminate the curvature of the degree of the jump (staggering) that the joint by film of going ahead of the rest and follow-up film produces.After junction surface 80 cut off, the length L of the film cross direction composition at the junction surface after wide W0 of film and the cut-out preferably satisfied following formula.
0.01(％)≤(1-(L/W0))×100≤29(％)
This is because if greater than 29%, and film may rupture when then stretching, if less than 0.01%, then can't bring into play in fact and be cut into circular-arc effect.
Required material and the manufacturing process of common polaroid below is described.In the present embodiment, as blooming, can enumerate light polarizing film.As banded film, can enumerate the polyvinyl alcohol film that uses in the light polarizing film.As the polyvinyl alcohol film, can enumerate the processed film of polyvinyl alcohol (PVA) film, partly-hydrolysed polyvinyl alcohol film or polyvinyl alcohol etc.Usually, above-mentioned film uses with the state of the film volume that is wound into web-like.
The degree of polymerization as the polymer of the material of polyvinyl alcohol film is generally 500～10, and 000, be preferably 1000～6000 scope, more preferably in 1400～4000 scope.And then when being partly-hydrolysed polyvinyl alcohol film, for example consider that from dissolubility aspect its saponification degree is preferably 75 moles more than the % to water, and more preferably 98 moles more than the %, the scope of 98.3～99.8 moles of % more preferably.
As the method for making of polyvinyl alcohol film, can suitably use by with any means film forming such as the The tape casting of the stoste casting film-forming of water-soluble or organic solvent, casting method, extrusion moldings.The phase difference value of film is preferably 5nm～100nm.In addition, in order to obtain in the face light polarizing film uniformly, the phase difference inequality in the preferably polyethylene alcohols face is as far as possible little, is below the 10nm measuring under the wavelength 1000nm preferably as phase difference inequality in the face of the polyvinyl alcohol film of film, more preferably below 5nm.
In the present embodiment, send film 36a,, implement the processing of the dipping operation by a plurality of grooves etc. at film handling part 3.Implement stretch processing by niproll 39a simultaneously, the mobile path of film 36a is limited by a plurality of deflector roll 39b.
Processing as the dipping operation, as shown in Figure 1, implement by feed swelling groove 4 with the swelling operation of film swelling, by feed staining trough 6 with the dyeing process of film dyeing, by feed dura mater groove 8 etc. make the crosslinked dura mater operation of the macromolecule that constitutes film, by feed stretch slot dipping operation that stretch slot 10 stretches easily, by feeding the processing of the matting that rinse bath 12 cleans film.Need to prove, after rinse bath 12 enforcement mattings, implement drying processes with drying device 14 usually.
As the swelling operation, for example be immersed in the water-filled swelling groove 4.Film water can be washed thus, clean the dirt or the anticaking agent on film surface.And then, can prevent the unequal inhomogeneities that dyes by making the film swelling.
Can in swelling groove 4, suitably add glycerine or KI etc.During interpolation, its concentration preferably glycerine below the 5 weight %, KI is below 10 weight %.The temperature of swelling groove 4 is preferably 20～50 ℃ scope, more preferably 25～45 ℃.Dip time in swelling groove 4 is preferably 2～180 seconds, more preferably 10～150 seconds, is preferably 60～120 seconds especially.Also can be in swelling groove 4 stretching polymer film.Stretching ratio comprises that also the stretching, extension that swelling causes is preferably about 1.1～3.5 times.
As dyeing process, for example by will in the staining trough 6 that comprises dichroic substance such as iodine, above-mentioned dichroic substance being adsorbed on the film through the film immersion of swelling operation.
As dichroic substance, can use existing known material, for example can enumerate iodine or organic dyestuff etc.As organic dyestuff, for example can use Red BR, Red LR, Red R, Pink LB, Rubin BL, Bordeaux (ボ Le De one) GS, Sky Blue LG, lemon yellow, Blue BR, Blue 2R, Navy RY, Green LG, Violet LB, Violet B, Black H, Black B, Black GSP, Yellow 3G, Yellow R, Orange LR, Orange 3R, Scarlet GL, Scarlet KGL, Congo Red, Brilliant Violet BK, Supra Blue G, Supra Blue GL, Supra Orange GL, Direct Sky B lue, Direct Fast Orange S, Fast B lack etc.
Above-mentioned dichroic substance can only be used a kind of, also can be also with more than two kinds.
When using above-mentioned organic dyestuff, for example consider that from the neutralisation aspect that realizes the visible region preferred compositions is more than two kinds.As concrete example, can enumerate Congo Red and Supra Blue G, SupraOrange GL and Direct Sky Blue combination or, the combination of Direct Sky Blue and Fast Black.
As the solution of staining trough 6, can use above-mentioned dichroic substance is dissolved in the solution that solvent obtains.As above-mentioned solvent, can make water usually, there is the organic solvent of intermiscibility to use but also can further add with water.As the concentration of dichroic substance, be preferably the scope of 0.010～10 weight %, the scope of 0.020～7 weight % more preferably is preferably the scope of 0.025～5 weight % especially.
When using iodine, consider the preferred iodide that further add from can further improving dyeing efficient aspect as above-mentioned dichroic substance.As these iodide, can enumerate for example KI, lithium iodide, sodium iodide, zinc iodide, silver iodide, lead iodide, cupric iodide, barium iodide, calcium iodide, stannic iodide, titanium iodide etc.The adding proportion of above-mentioned iodide is preferably 0.010～10 weight % in above-mentioned dye bath, more preferably 0.10～5 weight %.Wherein, preferably add KI, the ratio of iodine and KI (weight ratio) is preferably 1: 5～1: 100 scope, more preferably 1: 6～1: 80 scope is preferably 1: 7～1: 70 scope especially.
The dip time of film in staining trough 6 is not particularly limited, and is preferably 1～5 minute, more preferably 2～4 minutes.In addition, the temperature of dye bath is preferably 5～42 ℃ scope, more preferably 10～35 ℃ scope.In addition, also can be in this dye bath stretched film, this moment, total stretching ratio of accumulation was preferably about 1.1～4.0 times.
Need to prove,, except that the method for dipping in aforementioned staining trough 6, for example can adopt the aqueous solution coating that will contain dichroic substance or be sprayed to method on the above-mentioned polymer film as dyeing process.In addition, in the present invention, also can not carry out dyeing process,, adopt the film that obtains by the polymer raw material system film that has been pre-mixed dichroic substance as film.
As the dura mater operation, for example impregnated membranes is carried out crosslinked in comprising the dura mater groove 8 of crosslinking agent.As crosslinking agent, can use existing known material.For example can use boron compounds such as boric acid, borax, glyoxal, glutaraldehyde etc.Above-mentioned substance can only use a kind of, also can be also with more than two kinds.And with more than two kinds the time, for example combination of preferred boric acid and borax, in addition, its adding proportion (mol ratio) is preferably 4: 6～9: 1 scope, more preferably 5.5: 4.5～7: 3 scope most preferably is 6: 4.
As the solution of dura mater groove 8, can use above-mentioned crosslinking agent is dissolved in the solution that obtains in the solvent.As above-mentioned solvent, for example can make water, and then also can and use the organic solvent that intermiscibility is arranged with water.The concentration of crosslinking agent is not particularly limited, and is preferably the scope of 1～10 weight %, more preferably 2～6 weight %.
The uniform properties aspect is considered in the face that obtains light polarizing film, can add iodide in dura mater groove 8.As iodide, for example can enumerate KI, lithium iodide, sodium iodide, zinc iodide, silver iodide, lead iodide, cupric iodide, barium iodide, calcium iodide, stannic iodide, titanium iodide, the content of iodide is preferably 0.05～15 weight % during interpolation, more preferably 0.5～8 weight %.As the combination of crosslinking agent and iodide, preferred boric acid is the combination of KI, the ratio of boric acid and KI (weight ratio) is preferably 1: 0.1～and 1: 3.5 scope, more preferably 1: 0.5～1: 2.5 scope.
The temperature of dura mater groove 8 is preferably 20～70 ℃ scope usually, and the dip time of polymer film is generally 1 second～and 5 minutes, be preferably 5 seconds～4 minutes.In the crosslinked operation of dura mater, can be with polymer film stretching in dura mater groove 8, this moment, total stretching ratio of accumulation was preferably about 1.1～5.0 times.As the dura mater operation, can similarly replace processing with dyeing process by dura mater groove 8, use coating or spraying to contain the method for the solution of crosslinking agent.
In stretch bath dipping operation, under the state that impregnated in stretch slot 10, the total stretching ratio that is stretched to accumulation is for for example about 2～7 times.Solution as stretch slot 10 is not particularly limited, but for example can use the solution of the compound that has added various slaines, iodine, boron or zinc.As the solvent of this solution, can suitably make water, alcohol or various organic solvent.The boric acid about 2～18 weight % and/or the solution of KI have been added in preferred especially use respectively.When using this boric acid and KI simultaneously, it contains proportional (weight ratio) and preferably uses with about about 1: 0.1～1: 4, more preferably 1: 0.5～1: 3 ratio.As the temperature of stretch slot 10, for example be preferably 40～67 ℃ scope, more preferably 50～62 ℃.
Matting is for example to make film pass through the rinse bath 12 of water storage, the operation of the unwanted remnants such as boric acid that adhere in the flush away processing before this thus.Preferably in water, add iodide, for example preferably add sodium iodide or KI.When adding KI in the water of rinse bath 12, its concentration is generally 0.1～10 weight %, is preferably 3～8 weight %.And then the temperature of rinse bath 12 is preferably 10～60 ℃, more preferably 15～40 ℃.In addition, the number of times of cleaning treatment is not particularly limited, can be for repeatedly.Can be in advance in a plurality of rinse baths 12, store kind or the different water of concentration with additive, film is passed through wherein, implement matting thus.
Need to prove, when taking out in the groove of film from each operation,, also can remove residual moisture by using draining roller (liquid is cut れ ロ one Le) such as present known pinch roll or scraping method such as liquid with air knife in order to prevent dropping liquid.
As drying process, can adopt suitable methods such as air dry, air-dry, heat drying, usually preferred heat drying.The preferred heating-up temperature of the condition of heat drying is about 20～80 ℃, be about 1～10 minute drying time.
Embodiment
Below enumerate specific embodiments of the invention, illustrate in greater detail the present invention.
2 PVA films of thick 75 μ m, wide 480mm are passed through engagement device 26 thermal weldings, form junction surface 80.Engagement angles is changed in 0 °～60 ° scope.And then, be cut into the two ends at junction surface circular-arc.Change the size of the circular arc that cuts off, change so-called stock removal rate (く り order I rate).Confirm film fracture stretching ratio and arrive stretching ratio (being stretched to the multiplying power that does not rupture) to carry out synthetic determination.The fracture stretching ratio is called " bad " less than 6 times, the fracture stretching ratio be called about 6 times " can ", the fracture stretching ratio greater than 6 times, 7.5 times hereinafter referred to as " good ", the fracture stretching ratio surpasses 7.5 times and is called " best ".As shown in Figure 6, the width that makes film is W0, and the width at junction surface is W1, and the width at the junction surface of film cross direction is W2.In addition, as shown in Figure 5, making the length of the film cross direction composition at the junction surface 80 after the cut-out is L.Fig. 7 is the chart that has gathered condition and evaluation result.
Engagement angles is 0 ° in the comparative example 1, is 15 ° in the comparative example 2, is 70 ° in the comparative example 3.As shown in Table 1, the stretching ratio that does not rupture in comparative example 1-3 is 4.5 times.In addition, if stretching ratio surpasses 5.2 times, then fracture.
On the other hand, in embodiment 1～5, because engagement angles is more than 20 °, so the stretching ratio that does not rupture is more than 5.6, greater than comparative example 1-3.In addition, stretching ratio does not rupture till surpassing 6.2 times.Particularly in embodiment 3-5, by making engagement angles more than 30 °, the stretching ratio that does not rupture is 7.2, and the stretching ratio that fracture takes place is 7.5.In a word, the patience that can understand stretching improves.In addition, almost there is not difference at the stretching ratio that does not rupture (7.2) with under the stretching ratio (7.5) that takes place to rupture.Be appreciated that thus and can be stretched near boundary.
In comparative example 4-6, making engagement angles is 0 °, is cut into the two ends at junction surface circular-arc.Change the size of cut-out portion, stock removal rate is changed.In comparative example 4-6, be not formed obliquely the junction surface.Therefore, fracture stretching ratio, stretching ratio is identical with comparative example 1-3.
In embodiment 6-10, making engagement angles is 30 °, is cut into the two ends at junction surface circular-arc.Change the size of disconnected portion, stock removal rate is changed.
Stock removal rate is compared with embodiment 3 at the embodiment 6-9 of the scope of 0.01 (%)～29 (%), and fracture stretching ratio, stretching ratio improve.Be appreciated that thus fracture stretching ratio, stretching ratio improve by being formed obliquely the junction surface with predetermined angular, the two ends at junction surface being cut into circular-arc with prescribed level simultaneously.
Claims (9)
1. a blooming manufacture method is characterized in that, comprises following operation:
The front end of the rear end of the first polyvinyl alcohol film and the second polyvinyl alcohol film is engaged, forms the operation at junction surface in the mode below 60 ° more than 20 ° with the engagement angles that constitutes with direction perpendicular to draw direction,
Follow the described first polyvinyl alcohol film and send the operation of the described second polyvinyl alcohol film,
The engaged described first polyvinyl alcohol film and the described second polyvinyl alcohol symphysis are continued in stretch 3～8 times operation of carriage direction.
2. blooming manufacture method as claimed in claim 1, wherein, described engagement angles is more than 30 ° below 60 °.
3. blooming manufacture method as claimed in claim 1 or 2 wherein, before described stretching process, has circular-arc operation is cut at the two ends at described junction surface.
4. blooming manufacture method as claimed in claim 3 wherein, is being cut into the two ends at described junction surface in the circular-arc operation, satisfies following formula:
0.01≤(1-(L/W0))×100≤29
Wherein, W0: the film cross direction length before cutting off, L: the length of the film cross direction composition at the junction surface after the cut-out.
5. as each the described blooming manufacture method in the claim 1～4, wherein, described junction surface forms by thermal welding.
6. as each the described blooming manufacture method in the claim 1～5, wherein,
Before forming described junction surface, also comprise the operation that the front end of the rear end of the described first polyvinyl alcohol film and the described second polyvinyl alcohol film is cut into roughly the same engagement angles.
7. blooming, it is to make by each the described manufacture method in the claim 1～6.
8. liquid crystal indicator, it comprises the described blooming of claim 7.
9. image display device, it comprises the described blooming of claim 7.
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| JP2009232650 | 2009-10-06 | ||
| JP2009-232650 | 2009-10-06 | ||
| JP2010203998A JP5441225B2 (en) | 2009-10-06 | 2010-09-13 | Optical film manufacturing method, optical film, liquid crystal display device, and image display device |
| JP2010-203998 | 2010-09-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102909862A (en) * | 2011-08-05 | 2013-02-06 | 日东电工株式会社 | Manufacturing method for polarizing film |
| CN102909863A (en) * | 2011-08-05 | 2013-02-06 | 日东电工株式会社 | Method of manufacturing polarizing film |
| CN107497733A (en) * | 2017-06-14 | 2017-12-22 | 住华科技股份有限公司 | Liquid removing device and method for manufacturing optical film material |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016021432A1 (en) * | 2014-08-04 | 2016-02-11 | 住友化学株式会社 | Production method for polarizing film |
| KR102481275B1 (en) | 2021-05-12 | 2022-12-27 | 주식회사제이에스텍 | Pva film stretching device |
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| US20040100708A1 (en) * | 2002-11-08 | 2004-05-27 | Yoshiaki Noda | Producing method of optical film |
| US20080237913A1 (en) * | 2007-03-28 | 2008-10-02 | Fujifilm Corporation | Method for stretching polymer film |
| JP2008249766A (en) * | 2007-03-29 | 2008-10-16 | Sumitomo Chemical Co Ltd | Method for manufacturing polarizing film, and method for manufacturing polarizing plate |
| JP2009040034A (en) * | 2007-07-19 | 2009-02-26 | Nitto Denko Corp | Method of manufacturing optical film, optical film, liquid crystal display, image display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101398503A (en) | 2004-11-11 | 2009-04-01 | 日东电工株式会社 | Combination optical film, laminated combination optical film, and image display |
| JP2009051202A (en) | 2007-07-27 | 2009-03-12 | Nitto Denko Corp | Manufacturing process of optical film, optical film, liquid crystal display device, image display device |
| JP4824041B2 (en) | 2008-01-17 | 2011-11-24 | 日東電工株式会社 | Manufacturing method of polarizer |
| JP4651054B2 (en) | 2008-04-11 | 2011-03-16 | 日東電工株式会社 | Manufacturing method of polarizer and wet stretching apparatus used therefor |
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2010
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040100708A1 (en) * | 2002-11-08 | 2004-05-27 | Yoshiaki Noda | Producing method of optical film |
| US20080237913A1 (en) * | 2007-03-28 | 2008-10-02 | Fujifilm Corporation | Method for stretching polymer film |
| JP2008249766A (en) * | 2007-03-29 | 2008-10-16 | Sumitomo Chemical Co Ltd | Method for manufacturing polarizing film, and method for manufacturing polarizing plate |
| JP2009040034A (en) * | 2007-07-19 | 2009-02-26 | Nitto Denko Corp | Method of manufacturing optical film, optical film, liquid crystal display, image display device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102909862A (en) * | 2011-08-05 | 2013-02-06 | 日东电工株式会社 | Manufacturing method for polarizing film |
| CN102909863A (en) * | 2011-08-05 | 2013-02-06 | 日东电工株式会社 | Method of manufacturing polarizing film |
| TWI551425B (en) * | 2011-08-05 | 2016-10-01 | 日東電工股份有限公司 | Method of manufacturing polarizing film |
| CN102909862B (en) * | 2011-08-05 | 2016-12-21 | 日东电工株式会社 | The manufacture method of polarizing film |
| CN107497733A (en) * | 2017-06-14 | 2017-12-22 | 住华科技股份有限公司 | Liquid removing device and method for manufacturing optical film material |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102029710B (en) | 2015-04-01 |
| KR20110037868A (en) | 2011-04-13 |
| KR101723469B1 (en) | 2017-04-05 |
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