CN102029710B - 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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- CN102029710B CN102029710B CN201010298842.1A CN201010298842A CN102029710B CN 102029710 B CN102029710 B CN 102029710B CN 201010298842 A CN201010298842 A CN 201010298842A CN 102029710 B CN102029710 B CN 102029710B
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- film
- junction surface
- polyvinyl alcohol
- optical film
- cut
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Classifications
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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
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 the manufacture method of blooming, blooming, liquid crystal indicator and image display device.
Background technology
Blooming is used in image display device etc.Particularly use polarizer in liquid crystal indicator, electroluminescent (EL) display unit.As the manufacture method of polarizer, it is known to stretching device is sent into from the reel film polyvinyl alcohol reel film of band shape being rolled into roll formation in the leading section of reel film, while the process limit carrying out specifying makes it stretch, carry out the method (patent document 1,2) manufactured.
The treatment process of usual blooming is made up of multiple treatment trough.Make rectangular film be directly inserted in bath by hand by the operation of the deflector roll in treatment trough, undertaken by manual operations for a long time, or use conductor rope to carry out.So, there is the problem of operability and production efficiency difference.
In order to solve this problem, propose and engaged by the front end of heat-sealing by the rear end of leading reel film and follow-up reel film, arc-shaped is cut at junction surface, prevents the wide inhomogeneities of the film in stretching process or junction surface fracture (patent document 3,4) thus.
[prior art document]
[patent document]
[patent document 1] JP 2008-122988 publication
[patent document 2] JP 2008-250326 publication
[patent document 3] JP 2009-040034 publication
[patent document 4] JP 2009-051202 publication
Summary of the invention
But, engage leading reel (former anti-) rear end of film and the front end of follow-up reel film by heat-sealing and method junction surface being cut into arc-shaped suppresses the wide inhomogeneities of film in stretching process, junction surface fracture insufficient.When particularly considering to need high stretching ratio (5 ~ 7 times of A-stage) from the aspect of performance of polarizer, there is the problem that junction surface easily occurs to rupture.
The present invention in view of above-mentioned thing, even if order be to provide engaged multiple films stretched at carriage direction continuously, produce the manufacture method of the also low blooming of the possibility that to cause by stretching rupturing at junction surface.
According to an embodiment of the invention, the feature of the manufacture method of blooming is to comprise following operation: engaged the front end of the rear end of the first polyvinyl alcohol film and the second polyvinyl alcohol film, the operation at junction surface is formed in the engagement angles formed with the direction perpendicular to draw direction mode of less than 60 ° more than 20 °, then described first polyvinyl alcohol film sends the operation of described second polyvinyl alcohol film, and stretch engaged described first polyvinyl alcohol film and described second polyvinyl alcohol film at carriage direction the operation of 3 ~ 8 times continuously.
The junction surface of further investigation in the stretching process of polyvinyl alcohol film such as inventor and near fracture characteristics at the junction surface that the distortion (inhomogeneities that film is wide) of film cross direction, particularly inhomogeneities cause.By polyvinyl alcohol film carriage direction stretch 3 ~ 8 times time, belt type film shrinks at width.But even if when being stretched at carriage direction by polyvinyl alcohol film, junction surface is also shunk hardly at width.Therefore, during along formation junction surface, direction perpendicular to draw direction, belt type film defines the region at junction surface and the wide remarkable difference of film in other regions.Further, the inhomogeneities that this difference causes film wide or fracture is found.
According to the present invention, by the junction surface that the front end of the rear end of the first polyvinyl alcohol film and the second polyvinyl alcohol film engages, being that the mode of more than 20 ° less than 60 ° is formed obliquely relative to the engagement angles in the direction vertical with draw direction.The film cross direction composition (vector) at junction surface is made to increase with engagement angles and reduce thus.Even if when the first engaged polyvinyl alcohol film and the second polyvinyl alcohol film being stretched at carriage direction continuously, the contraction difference in the region and other regions that define junction surface also reduces.The fracture of the inhomogeneities that result can suppress film wide or film.
The engagement angles at junction surface is larger, and the effect of the inhomogeneities suppressing film wide and film fracture is larger.In a word, as long as in theory less than 90 °.On the other hand, if engagement angles is excessive, then the equipment etc. for the formation of junction surface is excessive.Therefore, the upper limit of engagement angles is preferably below 60 °.Engagement angles preferably more than 20 ° less than 60 °, more preferably more than 30 ° less than 60 °.
In the manufacture method of blooming of the present invention, preferably before above-mentioned stretching process, there is the operation two ends at above-mentioned junction surface being cut into arc-shaped.By arc-shaped is cut at the two ends at junction surface, resistance to breaking property during stretching can be improved.
In optical film producing method of the present invention, preferably in the operation two ends at above-mentioned junction surface being cut into arc-shaped, meet following formula.
0.01≤(1-(L/W0)) × 100≤29 (W0: the length cutting off cephacoria cross direction, L: the length of the film cross direction composition at junction surface after cutting off)
In optical film producing method of the present invention, form above-mentioned junction surface preferably by thermal welding.
As joint method, except utilizing above-mentioned thermal welding (ripe melt) and engaging, double-sided adhesive tape is also utilized to carry out adhesive joint.But when carrying out stretch processing in solution tank as polarizer manufacturing process, adhesive layer easily occurs and peels off, adhesive joint is not preferred.Herein, thermal welding refers to and utilizes heat sealing machine or ultrasonic wave to carry out heating and pressurizeing, and is softened by resin, is attached on other materials.
In the manufacture method of blooming of the present invention, preferably before the above-mentioned junction surface of formation, comprise the operation front end of the rear end of above-mentioned first polyvinyl alcohol film and above-mentioned second polyvinyl alcohol film being cut into roughly the same engagement angles further.
By the unwanted part of the front end of the rear end and the second polyvinyl alcohol film of excising the first polyvinyl alcohol film, the transport of polyvinyl alcohol film can be carried out smoothly.
The feature of blooming of the present invention is it is that manufacture method by above-mentioned record manufactures.
The feature of liquid crystal indicator of the present invention is to comprise above-mentioned blooming.
The feature of image display device of the present invention is to comprise above-mentioned blooming.
Manufacturing method according to the invention, even if stretch engaged polyvinyl alcohol film at carriage direction continuously also to suppress the fracture at junction surface.
Accompanying drawing explanation
[Fig. 1] represents the pie graph of the manufacture circuit of blooming.
[Fig. 2] represents the plane of the configuration of film and engagement device.
[Fig. 3] represents the key diagram of the joint action of film.
[Fig. 4] represents the plane of the position relationship at film and junction surface.
[Fig. 5] represents the plane of the state cut off at two ends, junction surface.
[Fig. 6] represents that engagement angles, film are wide, the plane of the relation of the width at junction surface.
[Fig. 7] summarizes the chart of condition and evaluation result.
Symbol description
1 ... manufacture 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 mono-レ Star ト device), 26 ... engagement device, 28 ... accumulation (ア キ ユ mono-system) device, 36a ... film, 36b ... first film volume, 40a ... film, 40b ... second film volume, 80 ... junction surface
Detailed description of the invention
Referring to accompanying drawing, the preferred embodiment of the present invention is described.By following preferred embodiment, the present invention is described, but can not departs from the scope of the present invention, changed by multiple gimmick, other embodiments beyond present embodiment can be utilized.Therefore, the whole changes in the scope of the invention are included within right.
Below, with reference to accompanying drawing, the preferred embodiment of optical film producing method of the present invention is described.Be described for light polarizing film as blooming.Fig. 1 is the formation sketch of the manufacture circuit for the manufacture of blooming.Manufacture circuit 1 and there is film supply unit 2, film handling part 3, film drying section 14, laminated section 16, film winder 18.Herein, film supply unit 2 comprises the turret apparatus 24 keeping multiple film volume, the engagement device 26, the accumulation device 28 that leading film and follow-up film are engaged.
Turret apparatus 24 has capstan head arm 30.Capstan head arm 30 with axle 34 for fulcrum can be rotatably set on pillar 32.In one end of capstan head arm 30, film 36a is made the first film volume 36b that web-like obtains and be rotatably supported on axle 38.As shown in the figure, the first film volume 36b is placed in film supply position.At the other end of capstan head arm 30, film 40a is made the second film volume 40b that web-like obtains and be rotatably supported on axle 42.From the first film volume 36b delivery film 36a.First film volume 36b is for when giving film 36a, and capstan head arm 30 rotates.Make the second film volume 40b move thus, be placed in film supply position.From the second film volume 40b delivery film 40a.During delivery film 40a, the first film volume 36b is installed in one end of capstan head arm 30.Repeatedly implement aforesaid operations, continuous delivery film 36a, 40a.
Engagement device 26 has pedestal 44 and end socket 46.End socket 46 possesses heater.The part with pedestal 44 subtend is heated by the front end of end socket 46 by heater.The front end of leading film 36a and the rear end of follow-up film 40a are by being pressurizeed by the end socket 46 that heats and pedestal 44.Thus by film 36a and film 40a thermal welding.In the present invention, as shown in Figure 2, configured obliquely by engagement device 26 relative to film 36a, 40a, the angle (θ) that the direction vertical with the carriage direction of arrow (draw direction) is formed is more than 20 ° less than 60 °.
As shown in Figure 1, accumulation device 28 possesses stationary roll 50 and mobile rollers 52.By making mobile rollers 52 move up and down, the time etc. needed for film joint can be adjusted.
Film handling part 3 comprises swelling groove 4, staining trough 6, dura mater groove 8, stretch slot 10, rinse bath 12, is configured to by so-called roller stretching mode successively stretched film 36a, 40a.Arrange multiple clamping parts of being made up of 1 couple of niproll 39a, it is arranged to film 36a, 40a of being transfused to be clamped between roller and sends to carriage direction.By making the niproll 39a in the downstream of carriage direction than the niproll 39a high speed of upstream side, stretched film 36a, 40a.Film handling part 3, except niproll 39a, in order to make film 36a, 40a by each groove, also possesses multiple deflector roll 39b of the mobile path of restriction film.
The joint sequency of present embodiment is described referring to Fig. 1 ~ Fig. 3.1st, from film supply unit 2, film 36a is supplied to swelling groove 4.Film 36a is transported in swelling groove 4, staining trough 6, dura mater groove 8, stretch slot 10, rinse bath 12.Film 36a stretches 3 ~ 8 times to carriage direction at the niproll 39a by passing through film handling part 3 during each groove.It is about 10 quality % that film 36a is dried to amount of moisture by drying device 14.Dried film 36a passes through laminated section 16 at two sides laminating diaphragm 64a.Film 36a is by film winder 18 wound into rolls.
Then, when completing from the first film volume 36b delivery film 36a, the rear end of film 36a is placed in engagement device 26.It should be noted that, in swelling groove 4, transport the transport film 36a be accommodated on accumulation device 28.Therefore, need not stop in each groove, transport film and the rear end of film 36a can be placed in engagement device 26.
Supply with the first film volume 36b completes, rotary turret arm 30, and the second film volume 40b is placed in film supply position.40b delivery film 40a is rolled up by the second film.Film 40a is transported to engagement device 26.The front end of film 40a is placed on engagement device 26.
When the rear end of film 36a and the front end of film 40a are located on engagement device 26, by pedestal 44 with by the end socket 46 heated, add the rear end of press mold 36a and the front end of film 40a.Thus by film 36a and film 40a thermal welding.In the present embodiment, the direction that engagement device 26 is vertical relative to the carriage direction (i.e. the draw direction of film) with film 36a, 40a is as shown in Figure 2 be obliquely installed more than 20 ° by less than 60 °.
As a result, as shown in Figure 4, the junction surface 80 being formed in the rear end of film 36a and the front end of film 40a is formed as engagement angles θ 1 more than 20 ° less than 60 °.As condition during thermal welding, preferable temperature about 200 DEG C.This is because at 150 DEG C, thermal welding is insufficient, 250 DEG C time, the excessive melting of film, fully can not keep the intensity at junction surface.Comprise the cool time after heating, required time is preferably 2 seconds ~ 10 seconds.Pressurize under 0.2 ~ 0.8MPa.
And then, in the present embodiment, preferably at film supply unit 2, before engagement device 26, configure film clipper (not shown).By film clipper, the front end edge engagement angles θ 1 of the rear end of film 36a and film 40a can be excised.Then, the front end of the rear end of film 36a and film 40a is engaged by engagement device 20.Because in advance the front end edge engagement angles θ 1 of the rear end of film 36a and film 40a is excised, so there is no remainder at film 36a, 40a after engaging.
Herein, remainder refers to as shown in Figure 4, is the region of junction surface 80 and the rear end to film 36a for leading film 36a, is the region of junction surface 80 and the front end to film 40a for follow-up film 40a.Because above-mentioned remainder is not fixed, so shake sometimes in the transport of film.This may affect the smooth transport of film.Therefore, the remainder of film is preferably excised in advance.
The front end of the rear end of film 36a and film 40a is engaged by the engagement angles that forms with the direction perpendicular to the draw direction junction surface of less than 60 ° more than 20 ° by the manufacture method of the blooming of present embodiment, input film handling part 3 continuously in turn, the process limit that regulation is implemented on limit makes it stretch, and makes blooming.
Fig. 5 represents the state engaged the front end of the rear end of leading film and follow-up film and the state two ends at junction surface being cut into arc-shaped.Junction surface 80 for being engaged the front end of the rear end of film 36a and film 40a is formed engagement angles θ 1 more than 20 ° less than 60 °.In the present embodiment, the rear end of film 36a and the front end of film 40a is excised by film clipper along engagement angles θ 1.Junction surface 80 is cut into arc-shaped at its two ends.By being cut into arc-shaped, the resistance to breaking property stretched that results from improves.Its reason is described.Suppose the rear end of film 36a and the front end of film 40a when film cross direction staggers (Fig. 5 (A)), stress concentrates on this part.By the two ends at junction surface being cut into arc-shaped (Fig. 5 (B)), stagger at film cross direction in the front end of the rear end and film 40a that avoid film 36a.Can prevent stress from concentrating on the both ends at junction surface thus.Therefore, when arc-shaped is cut at the two ends at junction surface, as long as the curvature of the degree of the jump (staggering) produced by the joint of leading film and follow-up film can be eliminated.After junction surface 80 cuts off, the length L of the film cross direction composition at the wide W0 of film and the junction surface after cutting off preferably meets following formula.
0.01(％)≤(1-(L/W0))×100≤29(％)
If this is because be greater than 29%, then when stretching, film may rupture, if be less than 0.01%, then cannot play in fact the effect being cut into arc-shaped.
Material needed for common polaroid and manufacturing process are below described.In the present embodiment, as blooming, light polarizing film can be enumerated.As belt type film, the polyvinyl alcohol film used in light polarizing film can be enumerated.As polyvinyl alcohol film, the processed film etc. of polyvinyl alcohol (PVA) film, partly-hydrolysed polyvinyl alcohol film or polyvinyl alcohol can be enumerated.Usually, the state that above-mentioned film is rolled up with the film of wound into rolls uses.
The degree of polymerization as the polymer of the material of polyvinyl alcohol film is generally 500 ~ 10, and 000, be preferably the scope of 1000 ~ 6000, more preferably in the scope of 1400 ~ 4000.And then when being partly-hydrolysed polyvinyl alcohol film, such as, from the viewpoint of the dissolubility to water, its saponification degree is preferably more than 75 % by mole, is more preferably more than 98 % by mole, more preferably the scope of 98.3 ~ 99.8 % by mole.
As the method for making of polyvinyl alcohol film, any means film forming such as the tape casting, casting method, extrusion molding by the stoste casting film-forming by water-soluble or organic solvent suitably can be used.The phase difference value of film is preferably 5nm ~ 100nm.In addition, in order to obtain uniform light polarizing film in face, the phase difference inequality in preferably polyethylene alcohols face is little as far as possible, and uneven as phase difference in the face of the polyvinyl alcohol film of film is preferably below 10nm under mensuration wavelength 1000nm, more preferably at below 5nm.
In the present embodiment, send film 36a, at film handling part 3, implement the process etc. of the dipping process by multiple groove.Implement stretch processing by niproll 39a, the mobile path of film 36a is limited by multiple deflector roll 39b simultaneously.
As the process of dipping process, as shown in Figure 1, implement by passing into swelling groove 4 by the swelling operation of film swelling, by passing into dyeing process that film dyes by staining trough 6, making the dura mater operation of the high molecular crosslink of formation film, by passing into stretch slot dipping process that stretch slot 10 easily carries out stretching, by passing into rinse bath 12 by the process of the matting of Membrane cleaning by passing into dura mater groove 8 etc.It should be noted that, after implementing matting with rinse bath 12, usually implement drying process with drying device 14.
As swelling operation, such as, be immersed in water-filled swelling groove 4.Film water can be washed thus, the dirt on cleaning film surface or anticaking agent.And then by making film swelling, the unequal inhomogeneities that dyes can be prevented.
Suitably glycerine or KI etc. can be added in swelling groove 4.During interpolation, its concentration preferably glycerine below 5 % by weight, KI is below 10 % by weight.The temperature of swelling groove 4 is preferably the scope of 20 ~ 50 DEG C, is more preferably 25 ~ 45 DEG C.Dip time in swelling groove 4 is preferably 2 ~ 180 seconds, is more preferably 10 ~ 150 seconds, is particularly preferably 60 ~ 120 seconds.Also can in swelling groove 4 stretching polymer film.Stretching ratio also comprises the stretching, extension that swelling causes and is preferably about 1.1 ~ 3.5 times.
As dyeing process, such as, by making above-mentioned dichroic substance be adsorbed on film in the staining trough 6 comprising the dichroic substance such as iodine the film immersion through swelling operation.
As dichroic substance, existing known material can be used, such as, can enumerate iodine or organic dyestuff etc.As organic dyestuff, such as 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 only can use one, also can be used together more than two kinds.
When using above-mentioned organic dyestuff, such as, from the viewpoint of the neutralisation realizing visible region, preferred compositions 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, the solution above-mentioned dichroic substance being dissolved in solvent and obtaining can be used.As above-mentioned solvent, usually can use water, but also can add further and have the organic solvent of intermiscibility to use with water.As the concentration of dichroic substance, be preferably the scope of 0.010 ~ 10 % by weight, be more preferably the scope of 0.020 ~ 7 % by weight, be particularly preferably the scope of 0.025 ~ 5 % by weight.
During as above-mentioned dichroic substance use iodine, from the viewpoint of staining efficiency can be improved further, preferably add iodide further.As these iodide, such as KI, lithium iodide, sodium iodide, zinc iodide, silver iodide, lead iodide, cupric iodide, barium iodide, calcium iodide, stannic iodide, titanium iodide etc. can be enumerated.The adding proportion of above-mentioned iodide is preferably 0.010 ~ 10 % by weight in above-mentioned dye bath, is more preferably 0.10 ~ 5 % by weight.Wherein, preferably add KI, the ratio (weight ratio) of iodine and KI is preferably the scope of 1: 5 ~ 1: 100, is more preferably the scope of 1: 6 ~ 1: 80, is particularly preferably the scope of 1: 7 ~ 1: 70.
The dip time of film in staining trough 6 is not particularly limited, and is preferably 1 ~ 5 minute, is more preferably 2 ~ 4 minutes.In addition, the temperature of dye bath is preferably the scope of 5 ~ 42 DEG C, is more preferably the scope of 10 ~ 35 DEG C.In addition, also can in this dye bath stretched film, the total stretching ratio now accumulated is preferably about 1.1 ~ 4.0 times.
It should be noted that, as dyeing process, except the method for flooding in aforementioned staining trough 6, such as, can adopt the method that the aqueous solution containing dichroic substance is coated with or is sprayed on above-mentioned polymer film.In addition, in the present invention, also can not carry out dyeing process, as film, adopt the film obtained by the polymer raw material masking being pre-mixed dichroic substance.
As dura mater operation, such as in the dura mater groove 8 comprising crosslinking agent, impregnated membranes is cross-linked.As crosslinking agent, existing known material can be used.Such as can use the boron compound such as boric acid, borax, glyoxal, glutaraldehyde etc.Above-mentioned substance only can use one, also can be used together more than two kinds.Such as, and during with more than two kinds, the combination of preferred boric acid and borax, in addition, its adding proportion (mol ratio) is preferably the scope of 4: 6 ~ 9: 1, is more preferably the scope of 5.5: 4.5 ~ 7: 3, most preferably is 6: 4.
As the solution of dura mater groove 8, can use and above-mentioned crosslinking agent is dissolved the solution obtained in a solvent.As above-mentioned solvent, such as, can use water, and then also can be used together the organic solvent having intermiscibility with water.The concentration of crosslinking agent is not particularly limited, and is preferably the scope of 1 ~ 10 % by weight, is more preferably 2 ~ 6 % by weight.
Uniform properties in the face obtaining light polarizing film, can add iodide in dura mater groove 8.As iodide, such as can enumerate KI, lithium iodide, sodium iodide, zinc iodide, silver iodide, lead iodide, cupric iodide, barium iodide, calcium iodide, stannic iodide, titanium iodide, during interpolation, the content of iodide is preferably 0.05 ~ 15 % by weight, is more preferably 0.5 ~ 8 % by weight.As the combination of crosslinking agent and iodide, preferred boric acid is the combination of KI, and the ratio (weight ratio) of boric acid and KI is preferably the scope of 1: 0.1 ~ 1: 3.5, is more preferably the scope of 1: 0.5 ~ 1: 2.5.
The temperature of dura mater groove 8 is preferably the scope of 20 ~ 70 DEG C usually, and the dip time of polymer film is generally 1 second ~ 5 minutes, is preferably 5 seconds ~ 4 minutes.In dura mater cross-linking process step, can by polymer film stretching in dura mater groove 8, the total stretching ratio now accumulated is preferably about 1.1 ~ 5.0 times.As dura mater operation, the process by dura mater groove 8 can be replaced in the same manner as dyeing process, use coating or spraying to contain the method for the solution of crosslinking agent.
In stretch bath dipping process, under the state that impregnated in stretch slot 10, the total stretching ratio being stretched to accumulation is such as about 2 ~ 7 times.As the solution of stretch slot 10, be not particularly limited, but such as can use the solution of the compound that with the addition of various slaine, iodine, boron or zinc.As the solvent of this solution, water, alcohol or various organic solvent suitably can be used.Particularly preferably use and with the addition of the boric acid of 2 ~ 18 about % by weight and/or the solution of KI respectively.When using this boric acid and KI, it preferably uses with the ratio of about 1: 0.1 ~ 1: 4, more preferably about 1: 0.5 ~ 1: 3 containing proportional (weight ratio) simultaneously.As the temperature of stretch slot 10, such as, be preferably the scope of 40 ~ 67 DEG C, be more preferably 50 ~ 62 DEG C.
Matting such as makes film by the rinse bath 12 of water storage, washes away the operation of the unwanted remnants such as the boric acid adhered in process before this thus.Preferably in water, add iodide, such as, preferably add sodium iodide or KI.When adding KI in the water of rinse bath 12, its concentration is generally 0.1 ~ 10 % by weight, is preferably 3 ~ 8 % by weight.And then the temperature of rinse bath 12 is preferably 10 ~ 60 DEG C, is more preferably 15 ~ 40 DEG C.In addition, the number of times of cleaning treatment is not particularly limited, and can be repeatedly.The water different from the kind of additive or concentration can be stored in advance in multiple rinse bath 12, make film pass through wherein, to implement matting thus.
It should be noted that, when film is taken out from the groove each operation, in order to prevent dropping liquid, also can by using the draining rollers (liquid cuts れ ロ mono-Le) such as current known pinch roll or scraping the method removing residual moistures such as liquid with air knife.
As drying process, the method that natural drying, air-dry, heat drying etc. are suitable can be adopted, usually preferred heat drying.The preferred heating-up temperature of condition of heat drying is about 20 ~ 80 DEG C, drying time is about 1 ~ 10 minute.
Laminated section 16 is configured in the downstream of drying device 14.Laminated section 16 has machine of sending (not shown) and a pair stacked roller (not shown) that diaphragm 64a is made the film volume that web-like obtains by supply.By laminated section 16, at the two sides of film F1, F2 or one side bonding protective film 64a.As diaphragm, TAC (trivinyl fthre element) can be used.
Film winder 18 is configured in the downstream of laminated section 16.By film winder 18 by film 36a, 40a wound into rolls.
Embodiment
Below enumerate specific embodiments of the invention, illustrate in greater detail the present invention.
By thick 75 μm, 2 PVA films of wide 480mm by engagement device 26 thermal welding, form junction surface 80.Engagement angles is changed in the scope of 0 ° ~ 60 °.And then, arc-shaped is cut at the two ends at junction surface.Change the size of the circular arc cut off, change so-called stock removal rate (く り order I rate).Confirm film break-draw multiplying power and arrive stretching ratio (being stretched to the multiplying power do not ruptured) to carry out synthetic determination.Break-draw multiplying power is less than 6 times and is called " bad ", and break-draw multiplying power is about 6 times and is called "available", break-draw multiplying power is greater than 6 times, at 7.5 times hereinafter referred to as " good ", break-draw multiplying power is called " best " more than 7.5 times.As shown in Figure 6, make the width of film be W0, 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, the length making the film cross direction composition at the junction surface after cut-out 80 is L.Fig. 7 is the chart summarizing condition and evaluation result.
In comparative example 1, engagement angles is 0 °, is 15 ° in comparative example 2, is 70 ° in comparative example 3.As shown in Table 1, the stretching ratio not occurring to rupture in comparative example 1-3 is 4.5 times.In addition, if stretching ratio is more than 5.2 times, then rupture.
On the other hand, in embodiment 1 ~ 5, because engagement angles is more than 20 °, so the stretching ratio not occurring to rupture is more than 5.6, be greater than comparative example 1-3.In addition, stretching ratio does not rupture till 6.2 times.Particularly in embodiment 3-5, by making engagement angles more than 30 °, the stretching ratio not occurring to rupture is 7.2, and the stretching ratio that fracture occurs is 7.5.In a word, the patience raising to stretching can be understood.In addition, under the stretching ratio (7.2) not occurring to rupture and the stretching ratio (7.5) that fracture occurs, almost difference is not had.Be appreciated that thus and can be stretched to close to boundary.
In comparative example 4-6, make engagement angles be 0 °, arc-shaped is cut at the two ends at junction surface.Change the size of cutting portion, stock removal rate is changed.In comparative example 4-6, be not formed obliquely junction surface.Therefore, break-draw multiplying power, stretching ratio are identical with comparative example 1-3.
In embodiment 6-10, make engagement angles be 30 °, arc-shaped is cut at the two ends at junction surface.Change the size in disconnected portion, stock removal rate is changed.
Make stock removal rate at the embodiment 6-9 of the scope of 0.01 (%) ~ 29 (%) compared with embodiment 3, break-draw multiplying power, stretching ratio improve.Be appreciated that by being formed obliquely junction surface with predetermined angular, arc-shaped being cut into prescribed level in the two ends at junction surface simultaneously thus, break-draw multiplying power, stretching ratio improve.
Claims (9)
1. an optical film producing 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 engagement angles formed with the direction perpendicular to draw direction mode of less than 60 ° more than 20 °,
Then described first polyvinyl alcohol film sends the operation of described second polyvinyl alcohol film,
Stretch engaged described first polyvinyl alcohol film and described second polyvinyl alcohol film at carriage direction the operation of 3 ~ 8 times continuously.
2. optical film producing method as claimed in claim 1, wherein, described engagement angles more than 30 ° less than 60 °.
3. optical film producing method as claimed in claim 1 or 2, wherein, before described stretching process, has the operation two ends at described junction surface being cut into arc-shaped.
4. the two ends at described junction surface wherein, are being cut in the operation of arc-shaped, are being met following formula by optical film producing method as claimed in claim 3:
0.01≤(1-(L/W0))×100≤29
Wherein, W0: the film cross direction length before cut-out, L: the length of the film cross direction composition at the junction surface after cut-out.
5. optical film producing method as claimed in claim 1 or 2, wherein, described junction surface is formed by thermal welding.
6. optical film producing method as claimed in claim 1 or 2, wherein,
Before the described junction surface of formation, also comprise the operation front end of the rear end of described first polyvinyl alcohol film and described second polyvinyl alcohol film being cut into roughly the same engagement angles.
7. a blooming, it is manufactured by the manufacture method described in any one in claim 1 ~ 6.
8. a liquid crystal indicator, it comprises blooming according to claim 7.
9. an image display device, it comprises blooming according to claim 7.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| JP2009232650 | 2009-10-06 | ||
| JP2009-232650 | 2009-10-06 | ||
| JP2010-203998 | 2010-09-13 | ||
| JP2010203998A JP5441225B2 (en) | 2009-10-06 | 2010-09-13 | Optical film manufacturing method, optical film, liquid crystal display device, and image display device |
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| CN102029710A CN102029710A (en) | 2011-04-27 |
| CN102029710B true CN102029710B (en) | 2015-04-01 |
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| JP5767891B2 (en) * | 2011-08-05 | 2015-08-26 | 日東電工株式会社 | Manufacturing method of polarizing film |
| JP5767892B2 (en) * | 2011-08-05 | 2015-08-26 | 日東電工株式会社 | Manufacturing method of polarizing film |
| KR101990222B1 (en) * | 2014-08-04 | 2019-06-17 | 스미또모 가가꾸 가부시키가이샤 | Production method for polarizing film |
| TWI620905B (en) * | 2017-06-14 | 2018-04-11 | 住華科技股份有限公司 | Device for removing liquid |
| KR102481275B1 (en) | 2021-05-12 | 2022-12-27 | 주식회사제이에스텍 | Pva film stretching device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| JP2004160665A (en) * | 2002-11-08 | 2004-06-10 | Fuji Photo Film Co Ltd | Manufacturing method for optical film |
| CN101398506B (en) * | 2004-11-11 | 2012-05-09 | 日东电工株式会社 | Combination optical film, laminated combination optical film, and image display |
| JP2008238678A (en) * | 2007-03-28 | 2008-10-09 | Fujifilm Corp | Method for stretching polymer film |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| KR101723469B1 (en) | 2017-04-05 |
| CN102029710A (en) | 2011-04-27 |
| KR20110037868A (en) | 2011-04-13 |
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