CN103128968B - The joint method of polyvinyl alcohol resin thin film and the manufacture method of polarizing film - Google Patents

The joint method of polyvinyl alcohol resin thin film and the manufacture method of polarizing film Download PDF

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Publication number
CN103128968B
CN103128968B CN201210480342.9A CN201210480342A CN103128968B CN 103128968 B CN103128968 B CN 103128968B CN 201210480342 A CN201210480342 A CN 201210480342A CN 103128968 B CN103128968 B CN 103128968B
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thin film
polyvinyl alcohol
alcohol resin
water
film
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CN103128968A (en
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松尾直之
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Nitto Denko Corp
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Nitto Denko Corp
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Classifications

    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81266—Optical properties, e.g. transparency, reflectivity
    • B29C66/81267—Transparent to electromagnetic radiation, e.g. to visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • B29K2995/0027—Transparent for light outside the visible spectrum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Physics & Mathematics (AREA)
  • Polarising Elements (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The present invention provides the joint method of polyvinyl alcohol resin thin film and the manufacture method of polarizing film.The interface side making the region becoming lap of at least one in the 1st polyvinyl alcohol resin thin film and the 2nd polyvinyl alcohol resin thin film absorbs water, make the thickness of the aforementioned areas relative to drying regime, aforementioned thicknesses after water suction reaches more than 101% and less than 110%, after this water suction, by both of the aforesaid film overlay, the aforementioned area illumination having inhaled water is had in 1.9 μm ~ 2.2 μ m the laser of spike length, the water existing for region that aforementioned laser has been inhaled water by this is made to absorb, thus implementing laser welding.

Description

The joint method of polyvinyl alcohol resin thin film and the manufacture method of polarizing film
Technical field
The present invention relates to the surface making a polyvinyl alcohol resin thin film overlapping with the surface of another polyvinyl alcohol resin thin film, its interface is carried out the joint method of the polyvinyl alcohol resin thin film of laser welding again, and uses the reel thin film being connected to more than 2 polyvinyl alcohol resin thin film to make the manufacture method of the polarizing film of polarizing film.
Background technology
At present, as the resin film of display higher water absorption, it is known to polyvinyl alcohol resin (PVA) thin film, this polyvinyl alcohol resin thin film can utilize as the raw material of polarizing film etc..
In the image display devices such as liquid crystal indicator, use the polarizing film of high-quality, in the manufacture method of this polarizing film, implement to make polyvinyl alcohol resin thin film impregnate in swelling bath, dye bath, stretch bath carries out the various process such as stretch processing.
Such as, this polarizing film following methods manufactures: the reel roller being coiled into roll from the banding polyvinyl alcohol resin film rolling as reel sends polyvinyl alcohol resin thin film (reel thin film), reel thin film is made to move along its length, it is immersed in swelling bath, dye bath continuously, afterwards, clamp reel thin film at front and back 2 place with aforementioned roller, reel thin film is applied tension force by producing rate of delivery difference, stretch.
But, in this manufacture method, whenever changing reel roller, again new reel film rolling is suspended to roller etc. is upper and that be set on device process is very loaded down with trivial details and time-consuming.Therefore, carried out following operation: the leading section of the reel thin film that the terminal part joint at the reel thin film got ahead stretches out from ensuing reel roller makes it connect, and is continuously fed to successively in said apparatus by 2 reel thin film.
As joint method now, adopting at present: the bonding joint method such as adhesive tape, bonding agent, utilize the stitching joint method of rivet, line etc., what utilize heat sealing machine (heatsealer) etc. adds heat fusing joint method etc..
But, in the above-mentioned methods, it is respectively provided with following problems.
The problem utilizing the bonding joint of adhesive tape, bonding agent etc.
By reel thin film in swelling bath, the dye bath etc. in the operation of dipping, owing to the dissolution such as composition of bonding agent is in medicinal liquid, therefore can become and pollute medicinal liquid, on goods, adhere to the main cause of foreign body.Moreover, there is also following worry: bonding agent is dissolved in medicinal liquid or swelling because of the composition of medicinal liquid, thus bond strength reduces, in stretching process, before reaching desired stretching ratio, connecting portion ruptures.
What utilize rivet, line etc. sews up the problem engaged
In the method, reel thin film wears for the hole by rivet, line, therefore, when connecting portion is applied tension force, there is the worry that fracture occurs with aforementioned apertures for starting point.
Reduce hole count in order to prevent this situation and guarantee, when the interval in hole is wider, exists and easily produce gauffer when applying tension force, it is possible to the main cause of fault when becoming mobile.
What utilize heat sealing machine etc. adds the problem that heat fusing engages
Joint method as the problem can sought in the above-mentioned bonding joint of solution, stitching joint, it is known to the method utilizing heat sealing machine to engage shown in following patent documentation 1 and 2 etc..
Owing to the method makes directly to engage between the parts of joint, therefore, compared with bonding joint, the probability of stained medicinal liquid is low, it is possible to achieve the joint of cleaning.It addition, compared with sewing up joint etc., it is possible to make junction surface form the state of more homogenizing, accordingly it is possible to prevent the formation of gauffer etc..
So, by utilizing heat sealing machine to engage, with bonding joint, sew up joint etc. compared with, it is possible to suppress when carrying out impregnation process because of medicinal liquid etc. cause stained.
Prior art literature
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2007-171897 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2010-8509 publication
Summary of the invention
The problem that invention to solve
But, in the joint utilizing heat sealing machine, as the degeneration due to the heat that is subject to when welding of the junction surface of weld portion and periphery thereof, compared with the region not having heating, there is the trend forming solid state.Therefore, when manufacturing above-mentioned polarizing film, after by heat sealing machine the reel thin film that formed by polyvinyl alcohol resin thin film being engaged, in order to give high polarisation function, when implementing stretch processing continuously with the stretching ratio of more than 5.25 times, stress concentrates on the region of above-mentioned solidification and the boundary member in the region not having solidification, it is possible to rupture.
Therefore, replace above-mentioned heat sealing machine, further contemplate at present and adopt joint for joint between resin parts etc., based on laser welding.
In existing laser welding, utilize the laser of the wavelength with infrared or near infrared region.It addition, 2 the resin film overlaps that will engage, on its interface, the compounding light absorber containing phthualocyanine pigment etc., is irradiated in this overlapping part by aforementioned laser.
In this laser welding, owing to few region of interface portion is heated by selectivity, therefore, it can suppress the solidification of above-mentioned junction surface and periphery thereof, thus, it is possible to form the conjugant of the stretch processing being resistant to high stretching ratio.
But, the light absorber likely stained above-mentioned medicinal liquid etc. of residual around welding position.
That is, in existing joint method, there is problems of, it is difficult to formed and there is the conjugant being suitable at the junction surface of the middle impregnation process such as medicinal liquid and the polyvinyl alcohol resin thin film of the stretching being resistant to high stretching ratio.
In view of the above problems, the problem of the present invention is to provide to be formed has the joint method being suitable at the junction surface of the middle impregnation process such as medicinal liquid and the polyvinyl alcohol resin thin film of the conjugant of the polyvinyl alcohol resin thin film of the stretching being resistant to high stretching ratio, and uses the manufacture method of the polarizing film of this joint method.
For solving the scheme of problem
It is that the surface making the 1st polyvinyl alcohol resin thin film is overlapping with the surface of the 2nd polyvinyl alcohol resin thin film, the joint method of the polyvinyl alcohol resin thin film of joint as the present invention of joint method being used for solving the polyvinyl alcohol resin thin film of the problems referred to above, wherein
The interface side making the region becoming lap of at least one the polyvinyl alcohol resin thin film in aforementioned 1st polyvinyl alcohol resin thin film and the 2nd polyvinyl alcohol resin thin film absorbs water, make the thickness of the aforementioned areas relative to drying regime, the thickness of the aforementioned areas after water suction reaches more than 101% and less than 110%
After this water suction, by aforementioned 1st polyvinyl alcohol film and the 2nd polyvinyl alcohol resin film overlay,
The aforementioned area illumination having inhaled water is had in 1.9 μm ~ 2.2 μ m the laser of spike length, makes the water existing for region that aforementioned laser has been inhaled water by this absorb, thus the interface of the aforementioned lap of laser welding.
Herein, the thickness of the aforementioned areas of drying regime refers to and arranges 1 hour, the thickness of weight aforementioned areas when reaching poised state under the environment of 83 DEG C.It addition, after the thickness after water suction refers to the water suction of the above-mentioned region becoming lap, the thickness in this region reaches thickness during poised state.
It addition, the manufacture method of the polarizing film of the present invention is to impregnate in medicinal liquid and stretch by making to be connected to the reel thin film of more than 2 polyvinyl alcohol resin thin film, thus making the manufacture method of the polarizing film of polarizing film, wherein,
The joint method of the polyvinyl alcohol resin thin film of the aforementioned present invention of connecting through of aforementioned reel thin film is implemented.
Accompanying drawing explanation
Fig. 1 indicates that the schematic perspective view of the device used in the manufacture method of the polarizing film of an embodiment.
Fig. 2 indicates that the schematic perspective view that reel thin film connects and supplies the situation manufacturing device to polarizing film.
Fig. 3 indicates that the schematic elevational view of the mechanism of the major part of the connecting device for connecting reel thin film.
Fig. 4 indicates that the signal side cross-sectional views of reel thin film water suction state.
Description of reference numerals
1: reel thin film (polyvinyl alcohol resin thin film), 1a: terminal part, 1b: leading section, 4d: stretch bath, 9: roller, 20: water-holding portion
Detailed description of the invention
Hereinafter enumerate the example of the manufacture method being applied to polarizing film so that the embodiment of the joint method of the polyvinyl alcohol resin thin film of the present invention to be described.
More specifically, illustrating connecting between banding polyvinyl alcohol resin thin film, these banding polyvinyl alcohol resin thin film being continuously fed stretching device, thus manufacturing the situation of polarizing film.
First, the preferred stretching device of the manufacture method of polarizing film for implementing present embodiment it is explained with reference to.
The stretching device of present embodiment possesses: be wound into roll from banding polyvinyl alcohol resin thin film (hereinafter also referred to " reel thin film " or referred to as " thin film ") and the reel roller that obtains sends the reel membrane supplying portion 3 of aforementioned reel thin film 1；For the reel sent thin film 1 being immersed in the multiple dipping baths 4 in the medicinal liquid of regulation；Multiple rollers 9 of the mobile route of reel thin film 1 are specified in the way of aforementioned reel thin film 1 passes through in this dipping bath 4；This mobile route stretches the extension section of reel thin film 1；And the thin film impregnated in multiple dipping baths 4 and stretched is batched the polarizing film reeling end 10 into roll as polarizing film.
Fig. 1, Fig. 2 indicate that the schematic perspective view of a mode of preferred stretching device.
As it is shown in figure 1, as multiple dipping baths 4, in stretching device, start from the moving direction upstream side of thin film to possess successively: storage has the swelling bath 4a of the swelling solution for making polyvinyl alcohol resin films swell；Storage has for the dye bath 4b by the dyeing liquor of swelling dyeing films；Storage has the crosslinking bath 4c of the cross-linking agent liquid of the strand crosslinking of the resin for making composition thin film；For the stretch bath 4d at bath stretch thin film；And storage has these 5 kinds of dipping baths 4 of washing bath 4f of the cleaning mixture for washing the thin film by this stretch bath 4d.
It addition, in the stretching device of which, the downstream of the washing bath 4f in the mobile route of thin film and the upstream side of reeling end 10 possess drying device 11 that the cleaning mixture making thin film adhere to dries, specifically drying oven.
And then, in the stretching device of which, it is respectively configured the film for laminating 12 such as the surface protective film (such as triacetylcellulose film, cyclic olefin polymer film) that is wound into roll in the side, two sides of the thin film dried with aforementioned drying device 11.Additionally, be also equipped with the laminater (not shown) of the two sides stacking film for laminating 12 for thin film after the drying.
As aforementioned extension section, adopt so-called roller extension section 9a.That is, adopt following composition: in aforementioned mobile route, configure many groups and clamp thin film and the paired roll 9a constituted in the way of sending to moving direction downstream by centre, and make the peripheral speed of the group in moving direction downstream higher than upstream side.
In addition, in this stretching device, as shown in Figure 2, possess: at the terminal part 1a of reel thin film 1 by before before the mobile route that defines, specifically by dipping bath 4, the connecting device (not shown in Fig. 2) the terminal part 1a of reel thin film 1 being connected by the leading section 1b of the new reel thin film 1 in mobile route with and then this reel thin film 1 by laser welding.
It should be noted that in Fig. 2, represent by the part 30 of blacking and irradiate, by laser, the part being attached.
Then, with reference to Fig. 3, preferred connecting device is illustrated.
This Fig. 3 indicates that the schematic configuration of the connecting device making reel thin film be bonded with each other by laser welding and to connect.
Fig. 3 represents the front view of the connecting device observing the new and old reel thin film connected from its side towards TD direction (width).
As shown in Figure 3, aforementioned connecting device has: have the platform 40 of smooth upper surface portion；Be arranged in this platform 40 top, can the pressure-producing part 50 that configures movably of above-below direction；With the LASER Light Source of the top being arranged in this pressure-producing part 50 (not shown).Additionally, aforementioned connecting device such as composition of getting off: make the terminal part 1a of the reel thin film (the 1st polyvinyl alcohol resin thin film) 1 got ahead and coupled new reel thin film 1(the 2nd polyvinyl alcohol resin thin film) leading section 1b up and down overlapping on previous platform 40, while this lap is added flanging by aforementioned laser light source irradiation laser R with aforementioned pressure-producing part 50, the interface portion of aforementioned end portion 1a and aforementioned leading section 1b is made to add heat fusing welding.Aforementioned pressure-producing part 50 is made up of the transparent component that the transmittance of laser R is excellent.
It should be noted that, in order to improve the light absorption of the laser R of the interface portion of aforementioned end portion 1a and aforementioned leading section 1b, more effectively implement welding, aforementioned connecting device wants the surface of any one (or two sides) in aforementioned end portion 1a that face connects or aforementioned leading section 1b to have the water-holding portion of absorption water in advance in foregoing interface portion.
As this water-holding portion, especially, it is used for making laser to the thin film of the upside of foregoing interface transmission (in Fig. 3 with adopting, the reel thin film (terminal part 1a) got ahead) below the water-holding portion of absorption water compare, it is preferred to use for the water-holding portion 20(of absorption water on the reel thin film (leading section 1b) of the downside engaged with this thin film with reference to Fig. 4).
Additionally, this water-holding portion can be constituted with the common unit being used for being coated with water distribution, as this apparatus for coating, for instance, it is possible to adopt allotter, ink-jet printer, screen process press, two-fluid formula, single fluid formula or ultrasonic type aerosol apparatus, pressing mold (stamper), coating machine etc..
Such as, when adopting ultrasonic type aerosol apparatus, by suitable set point footpath (spot) (mm φ), spray amount (mL/min), scanning speed (mm/sec), scanning times (secondary), it is possible to adjust the amount (water absorption) of water suction.
Wherein, as the method making the above-mentioned region water suction becoming lap, as mentioned above, the method absorbed water by being coated with water distribution can be adopted, in addition, the humidity environment by regulating the indoor etc. carrying out laser welding can also be adopted, make all reel film surface water suctions, so that the method for the interface side water suction of terminal part 1a or leading section 1b.So, the water that above-mentioned lap absorbs can be water vapour.
It addition, the laser utilized in this connecting device undertakes the effect that in the middle of the lap of new and old reel thin film (interface) upper absorbed water absorbs, generates heat.It addition, as the laser used, it is preferable that there is the wavelength that the absorption sensitivity to water is high.From described viewpoint, adopt the laser in 1.9 μm ~ 2.2 μ m with spike length.As long as it addition, this laser can occur the kind of LASER Light Source, it being not particularly limited.Such as, as being used for irradiating the laser of this laser, it is possible to use thulium doped optical-fiber laser, the YAG laser of doping holmium and InGaAs semiconductor laser.
From the viewpoint of avoid decomposing and promoting the melted of this reel thin film of reel thin film, compared with putting into high-octane pulse laser with moment, the CW laser of continuous wave is preferred.
The output (power) of laser, beam sizes and shape, irradiation number of times and scanning speed etc. can according to the optical characteristics such as water suction state and the absorptivity of the polyvinyl alcohol resin thin film becoming object, the Bu Tong suitably optimizations constituting the thermal characteristics etc. such as the fusing point of polymer of reel thin film, glass transition temperature (Tg).Such as, in order to effectively make polyvinyl alcohol resin liquidation firmly be engaged in the part of irradiating laser, as the power density of the laser irradiated, it is preferable that at 200W/cm2~10000W/cm2Scope in, it is preferred that at 300W/cm2~5000W/cm2Scope in, it is particularly preferred at 1000W/cm2~3500W/cm2Scope in.
Wherein, as the accumulative irradiation dose of laser, it is preferable that at 5J/cm2~400J/cm2Scope in, it is preferred that at 10J/cm2~300J/cm2Scope in, it is particularly preferred at 30J/cm2~150J/cm2Scope in.
It is therefore preferable that adopt the laser that disclosure satisfy that these conditions in connecting device.
It addition, the LASER Light Source utilized in connecting device preferably can at the interface of new and old reel thin film with the LASER Light Source of spot diameter (spotdiameter, the irradiating width) irradiating laser of given size.
This irradiation spot diameter (irradiating width) suitably can set according to required engaged width, engaging profile, such as, as irradiating spot diameter, it is preferable that for less than more than 1/10 and 3 times of new and old reel film overlay width under the power meeting aforementioned irradiating laser power density.
Not enough overlapping widths 1/10 time, the non-junction surface of lap is big, and when moving after joint, thin film tampers, it is possible to hinder the good mobility of thin film.
It addition, under the width more than 3 times during irradiating laser, although joint and tensile properties are not affected, but not preferred from the viewpoint of energy utilization efficiency.
Preferably, aforementioned spot diameter is less than more than 1/5 and 2 times of aforementioned overlapping widths.
Wherein, the overlapping widths of new and old reel thin film is preferably more than 0.1mm and less than 50mm, more preferably more than 0.5mm and less than 30mm.
This is because, when overlapping widths is less than 0.1mm, it is difficult to the reel thin film of the wide cut that overlaps with good repeatable accuracy, and when being more than 50mm, non-engaging zones becomes big, is likely to occur tampering of thin film when moving after joint.
It addition, in the overlapping portion of new and old reel thin film, owing to the abundant region of the leading section of each reel thin film engages, therefore two leading sections will not tamper in movement, is preferred on the good mobility realize thin film.Considering described viewpoint, the width at the non-junction surface of the lap of new and old reel thin film is preferably below 5mm, more preferably below 2mm, more preferably 0mm(lap full engagement).
It addition, the beam shape of laser can be circular, from the viewpoint obtaining higher power density, it is possible to be wire.
In the present embodiment, it is preferred that the lap along overlapping new and old reel thin film implements laser welding, is constituted aforementioned connecting device in the way of can forming the weld portion of wire.Such as, in connecting device, it is preferable that possess: for the mechanism making the spot beam of the beam sizes desired by collecting lens optically focused one-tenth scan along lap；By using the optics such as cylindrical lens, diffraction optical element be shaped as the laser beam of wire and be irradiated to the mechanism of lap of reel thin film；And by configuring multiple LASER Light Sources along lap and irradiating when not scanning thus the disposable melted mechanism etc. adding thermal bonding simultaneously.
In the irradiation of this laser, as the pressure-producing part 50 on platform, the overlapping aforementioned new and old reel thin film leading section 1b of new reel thin film (the terminal part 1a of old reel thin film with) pressurizeed, it is possible to use the parts of the glass of high transparent for the laser display that uses.
Biasing strength when irradiating as laser, it is preferable that at 0.5 ~ 100kgf/cm2Scope in, more preferably in 10 ~ 70kgf/cm2Scope in.
Accordingly, as the pressure-producing part 50 preferably employed in aforementioned connecting device, as long as the parts that can pressurize with this intensity, the shape of its glass component is not particularly limited, for instance flat board, cylinder, spherical shape can be used.
The thickness of glass component is not particularly limited, when crossing thin, because deformation cannot be carried out good pressurization, time blocked up, the utilization ratio of laser declines, therefore, thickness through laser direction is preferably more than 3mm and less than 30mm, more preferably more than 5mm and less than 20mm.
Material as pressure-producing part 50, for instance, quartz glass, alkali-free glass, TEMPAX, PYREX(registered trade mark can be listed), VYCOR, D263, OA10, AF45 etc..
In order to improve the utilization ratio of laser R, the glass parts that pressure-producing part 50 utilizes preferably have the high transparent for the optical maser wavelength used, it is preferable that have the light transmittance of more than 50%, it is preferred that have the light transmittance of more than 70%.
It should be noted that, when using glass parts as above to constitute pressure-producing part 50, can also forming, with part that polyvinyl alcohol resin thin film connects, the cushion that resiliency is more excellent compared with foregoing glass parts, bigger area can be pressurizeed more equably and carries out good joint in whole region.
Namely, it would however also be possible to employ possess the good rubber slab of light transmission, there is the pressure-producing part 50 of the transparent resin plate etc. of resiliency.It is for instance possible to use rear side is made up of the pressure-producing part 50 that the front face side connected with polyvinyl alcohol resin thin film is made up of transparent rubber plate plate glass parts.
The formation of aforementioned cushion can use the resin materials such as the such as rubber-based material such as silicone rubber, polyurethane rubber, polyethylene.
The thickness of this cushion is preferably more than 50 μm and less than 5mm, more preferably more than 1mm and less than 3mm.
During less than 50 μm, lack resiliency, during for more than 5mm, there is following worry: according to this cushion, produce the absorption of laser, scattering, make the energy of the laser in the contact interface portion of arrival aforementioned end portion 1a and leading section 1b reduce.
The optical maser wavelength used preferably is had the light transmittance of more than 30% by this cushion, more preferably more than 50%.
About the platform 40 cooperated with above-mentioned pressure-producing part, the lap of reel thin film is pressurizeed, its material is not particularly limited, for instance, it is possible to adopt the platform that its upper surface portion metal, glass, resin, rubber, pottery etc. are formed.
But, when the reel thin film of wide cut is spliced (joint), in order to pressurize equably in face, whole region is reached good joint, it is preferred to use the platform that upper surface portion hardness is relatively low, have the rubber series of resiliency, the material of resin system is formed.
Furthermore it is also possible to the cushion that configuration is same with above-mentioned cushion on platform 40.On platform 40 during configuration, optical characteristics and light transmission to the material for forming cushion are not particularly limited, except above-mentioned silicone rubber etc., for example, it is also possible to use Merlon, polyethylene terephthalate, norbornene resin, cyclic olefin polymer, polymethyl methacrylate, polyimides, triacetyl cellulose etc..
Although it should be noted that here without detailed narration, but above-mentioned connecting device can adopt the various mechanisms utilized in general laser welding device and its periphery machine.
Then, the method illustrating to utilize the stretching device possessing this connecting device to manufacture polarizing film.
In the manufacture method of the polarizing film of present embodiment, implement following procedures: make aforementioned reel thin film impregnate in swelling bath 4a with so as to swelling swelling operation；Swelling thin film is made to impregnate the dyeing process carrying out dyeing in dye bath 4b；The thin film making dyeing impregnates so that constituting the cross-linking process step of the strand crosslinking of the resin of thin film in crosslinking bath 4c；The stretching process that thin film after this cross-linking process step is stretched in stretch bath 4d；The washing procedure that thin film after this stretching process is washed in washing bath 4f；The drying process dry in drying device 11 by this washed thin film；Surface protective film is layered in the lamination process on this dried thin film.
And, the manufacture method of the polarizing film of present embodiment is undertaken by following process: be set in by a reel roller in aforementioned reel membrane supplying portion 3, reel thin film is sent continuously from this reel membrane supplying portion 3, its mobile route is implemented above-mentioned operation, finally complete lamination process, resulting product (polarizing film) is implemented in polarizing film reeling end 10 and batches the coiling process into roll, wherein, before aforementioned reel roller terminates, reel thin film is stretched out from new reel roller, additionally implement to make the leading section 1b of reel thin film and the terminal part 1a of the reel thin film the got ahead connection operation being connected that this is new, succeedingly, reel thin film is supplied stretching device from this new reel roller, it is continuously manufactured by polarizing film.
Wherein, as the reel thin film (banding polyvinyl alcohol resin thin film) supplying this operation, it is possible to adopt following thin film.
As the reel thin film of the manufacture method of the polarizing film for present embodiment, using the thin film formed by the raw-material polyethenol series macromolecule resin material as polarizing film, it is swelling resin film by absorption water.Specifically, for instance, it is possible to use the processed thin film etc. of polyvinyl alcohol film, partly-hydrolysed polyvinyl alcohol film or polyvinyl alcohol.
Generally, these reel thin film are as mentioned above to be wound into the state use of the reel thin film of roll.
As the degree of polymerization of the polymer forming material of aforementioned polyvinyl alcohol resin thin film, it is generally 500 ~ 10000, it is preferred to the scope of 1000 ~ 6000, more preferably the scope of 1400 ~ 4000.
Additionally, when partly-hydrolysed polyvinyl alcohol film, consider from the deliquescent viewpoint water, its saponification degree is such as preferably 75 moles of more than %, more preferably 98 moles of more than %, it is preferred that in the scope of 98.3 ~ 99.8 moles of %.
As aforementioned polyvinyl alcohol resin thin film, it is possible to suitably use the thin film of any means film forming such as the tape casting of stock solution casting film-forming by being dissolved in water or organic solvent, casting method, extrusion molding.
The phase difference value of reel thin film is preferably 5nm ~ 100nm.
It addition, in order to obtain polarizing film homogeneous in face, it is preferred that the phase contrast deviation of polyvinyl alcohol resin thin film is little as far as possible.Under measuring wavelength 1000nm, below 10nm, more preferably below 5nm it is preferably as phase contrast deviation in the face of the polyvinyl alcohol resin thin film of reel thin film.
It addition, the thickness of polyvinyl alcohol resin thin film is preferably 20 ~ 100 μm.Owing to described thickness is 20 ~ 100 μm, it is possible to will engage between polyvinyl alcohol resin thin film more reliably.
The moisture content of described polyvinyl alcohol resin thin film is generally at most 0.6 mass %.That is, before following water suction, the moisture content of polyvinyl alcohol resin thin film is generally below 0.6 mass %.Wherein, the water suction state of polyvinyl alcohol resin thin film during laser welding is being described below.
Then each operation illustrating, with aforementioned stretching device, above-mentioned reel thin film is applied stretching and be processed into polarizing film.
(swelling operation)
In this operation, for instance, utilize aforementioned roller 9 translational speed constant for the reel thin film sent from reel membrane supplying portion 3 maintenance to be guided to water-filled swelling bath 4a, make aforementioned reel thin film dipped in water.
Thus, reel thin film is washed, it is possible to wash away the spot of reel film surface, anti-blocking agent, and, by utilizing water to make reel films swell, it is possible to the effect of unequal inhomogeneity of expecting to prevent from dyeing.
In swelling solution in aforementioned swelling bath 4a, than water, it is also possible to be properly added glycerol, potassium iodide etc..When adding them, if being glycerol, then its concentration is preferably below 5 mass %, if being potassium iodide, then its concentration is preferably below 10 mass %.
The temperature of swelling solution is preferably the scope of 20 ~ 45 DEG C, more preferably the scope of 25 ~ 40 DEG C.
The dip time that aforementioned reel thin film impregnates in aforementioned swelling solution is preferably 2～180 seconds, more preferably 10～150 seconds, it is particularly preferred to be 30～120 seconds.
Furthermore it is possible to polyvinyl alcohol resin thin film is stretched along its length in this swelling bath, stretching ratio at this moment preferably include because of swelling cause extend in be about 1.1～3.5 times.
(dyeing process)
For have passed through the thin film of aforementioned swelling operation, in the same manner as swelling operation, utilizing roller 9 to make it impregnated in the dyeing liquor being stored in dye bath 4b, implementing dyeing process.
It is for instance possible to use by the thin film being dipped through swelling operation in the dyeing liquor comprising the dichroic substance such as iodine, the method making this thin film adsorb above-mentioned dichroic substance, implement aforementioned dyeing process.
As aforementioned dichroic substance, it is possible to use known material, for instance iodine, organic dyestuff etc. can be listed.
As organic dyestuff, such as can use: red BR, red LR, red R, pink LB, ruby red BL, purplish red (Bordeaux) GS, skyblue LG, lemon yellow, blue BR, blue 2R, navy blue RY, green LG, purple LB, purple B, black H, black B, black GSP, yellow 3G, yellow R, orange LR, orange 3R, scarlet (Scarlet) GL, scarlet KGL, Congo red, brilliant violet BK, super indigo plant (SupraBlue) G, super indigo plant (SupraBlue) GL, super orange (SupraOrange) GL, direct sky blue, direct solid orange (DirectFastOrange) S forever, forever consolidate black (Firstblack) etc..
These dichroic substance can use only a kind of, it is also possible to is used in combination of two or more.
When using aforementioned organic dyestuff, for instance from the viewpoint of the neutralization seeking visible region, it is preferable that combine two or more.
As concrete example, it is possible to list: the combination of Congo red and super indigo plant (SupraBlue) G, super orange (SupraOrange) GL and direct sky blue or direct sky blue and forever solid black combination etc..
Dyeing liquor as aforementioned dye bath, it is possible to use dissolved the solution of aforementioned dichroic substance in solvent.
As aforementioned solvents, generally can use water, it is possible to interpolation further, use and glassware for drinking water have the organic solvent of the compatibility.
Concentration as the dichroic substance in this dyeing liquor, it is preferred to the scope of 0.010 ~ 10 mass %, more preferably the scope of 0.020 ~ 7 mass %, it is particularly preferred to be 0.025 ~ 5 mass %.
It addition, when using iodine as aforementioned dichroic substance, it is possible to improve staining efficiency further, it is thus preferred to add iodide further.
As these iodide, for instance can list: potassium iodide, lithium iodide, sodium iodide, zinc iodide, silver iodide, lead iodide, Copper diiodide, barium iodide, calcium iodide, Tin tetraiodide., titanium iodide etc..
The interpolation ratio of these iodide is preferably 0.010～10 mass % in aforementioned dye bath, more preferably 0.10～5 mass %.
Wherein, it is preferable that adding potassium iodide, the ratio (mass ratio) of iodine and potassium iodide is preferably in the scope of 1:5～1:100, more preferably in the scope of 1:6～1:80, it is particularly preferred in the scope of 1:7～1:70.
Thin film dip time in aforementioned dye bath is not particularly limited, it is preferred to the scope of 0.5 ~ 20 minute, more preferably the scope of 1 ~ 10 minute.It addition, the temperature of dye bath is preferably the scope of 5 ~ 42 DEG C, more preferably the scope of 10 ~ 35 DEG C.
It addition, in this dye bath, it is possible to stretching reel thin film in the longitudinal direction, the total stretching ratio of accumulation now is preferably about 1.1 ~ 4.0 times.
Wherein, as dyeing process, except the aforementioned method impregnated in dye bath, for instance, it is possible to adopt the method being coated with by the aqueous solution containing dichroic substance or sparging aforementioned film.
It addition, in the present invention, as the reel thin film used, it would however also be possible to employ do not carry out dyeing process and the thin film that obtained by the polymer raw material film forming being contaminated with dichroic substance in advance.
(cross-linking process step)
Then, have passed through the thin film of dyeing process import to storage have cross-linking agent liquid crosslinking bath 4c in, by thin film dipped in aforementioned crosslinking agent liquid, enforcement cross-linking process step.
As aforementioned crosslinking agent, it is possible to use known material.
Such as can use the boron compound such as boric acid, Borax, Biformyl, glutaraldehyde etc..
These can only use one, it is also possible to combination uses two or more.
When combination uses two or more, it is preferable that the combination of such as boric acid and Borax, it addition, it adds the ratio (mol ratio) scope preferably in 4:6～9:1, more preferably in the scope of 5.5:4.5～7:3, it is most preferred that for 6:4.
Cross-linking agent liquid as aforementioned crosslinking bath, it is possible to use the liquid being dissolved in solvent by aforementioned crosslinking agent gained.
As aforementioned solvents, for instance water can be used, it is also possible to combination use and glassware for drinking water have the organic solvent of the compatibility further.The concentration of the cross-linking agent in aforementioned crosslinking agent liquid is not particularly limited, it is preferred to the scope of 1～10 mass %, more preferably 2～6 mass %.
In cross-linking agent liquid in aforementioned crosslinking bath, in order to give polarizing film with characteristic homogeneous in face, it is possible to add iodide.
As these iodide, for instance potassium iodide, lithium iodide, sodium iodide, zinc iodide, silver iodide, lead iodide, Copper diiodide, barium iodide, calcium iodide, Tin tetraiodide., titanium iodide etc. can be listed.The content of iodide when adding them is preferably 0.05 ~ 15 mass %, more preferably 0.5 ~ 8 mass %.
Combination as the combination of cross-linking agent Yu iodide, boric acid and potassium iodide is preferred, and the ratio (mass ratio) of boric acid and potassium iodide is preferably the scope of 1:0.1 ~ 1:3.5, the more preferably scope of 1:0.5 ~ 1:2.5.
The temperature of the cross-linking agent liquid in aforementioned crosslinking bath is preferably generally the scope of 20～70 DEG C, and the dip time of polyvinyl alcohol resin thin film is generally any time in the scope of 1 second～15 minutes, it is preferred to 5 seconds～10 minutes.
In this cross-linking process step, it is possible to being stretched along its length by thin film in crosslinking bath, accumulative total stretching ratio now is preferably about 1.1～5.0 times.
It should be noted that as cross-linking process step, it is possible to same with dyeing process, replace the processing method being immersed in cross-linking agent liquid, by being coated with or the method containing cross-linking agent solution of spraying is implemented.
(stretching process)
Aforementioned stretching process is to be stretched along its length by the thin film dyeing, cross-linking, make the operation that total stretching ratio is about 2 ~ 8 times such as accumulated, in wet type pulling method, in stretch bath, under the state of the solution of storage, apply tension force along its length by thin film dipped, implement to stretch.
As the solution being stored in stretch bath, it does not have be particularly limited to, for instance the solution of the compound being added with various slaine, iodine, boron or zinc can be used.
Solvent as this solution, it is possible to suitably use water, ethanol or various organic solvent.
Wherein, it is particularly preferred to use and be added with the boric acid of about 2～18 mass % and/or the solution of potassium iodide respectively.
When using this boric acid and potassium iodide, it contains ratio (mass ratio) and is preferably about 1:0.1～1:4, more preferably about 1:0.5～1:3 simultaneously.
Temperature as the solution in aforementioned stretch bath, for instance be preferably the scope of 40～67 DEG C, more preferably 50～62 DEG C.
(washing procedure)
This washing procedure for example is by making aforementioned reel thin film by storing in the washing bath having the cleaning mixture such as water thus the operation of the unwanted residues such as the boric acid rinsed out in attachment in the process before this operation.
Aforementioned water preferably adds iodide, for instance preferably add sodium iodide or potassium iodide.
When being used in water as washing bath adding the aqueous solution of potassium iodide, its concentration is generally 0.1～10 mass %, it is preferred to 3～8 mass %.
And then, the temperature of cleaning mixture is preferably 10～60 DEG C, more preferably 15～40 DEG C.
Additionally, the number of times of carrying out washing treatment, be namely immersed in cleaning mixture after the number of repetition mentioned from cleaning mixture be not particularly limited, can be repeatedly, it is also possible to by storing the different aqueous solution of the kind of additive, concentration in multiple washing baths in advance and making thin film pass through them thus implementing washing procedure.
It should be noted that by when thin film dipping bath from each operation is mentioned, in order to prevent the generation of liquid sagging, it is possible to use known use pinch roll etc. is removed liquid roller or reamed the methods such as liquid by air knife and remove unnecessary moisture.
(drying process)
The thin film carrying out in aforementioned washing procedure washing can be imported in aforementioned drying device 11, dry by the suitableeest methods such as natural drying, air-dry, heat dryings, implement this drying process.
Wherein, if implementing drying process by heat drying, then the condition of heat drying is preferably: heating-up temperature is about 20～80 DEG C, drying time is about 1～10 minute.
And then, unrelated with preceding method, in order to prevent the deterioration of thin film, it is preferable that baking temperature is low temperature as far as possible.
It is more preferably less than 60 DEG C, it is particularly preferred to be less than 45 DEG C.
(lamination process) and (coiling process)
In the present embodiment, the coiling process of the reel thin film that have passed through above operation is batched by enforcement polarizing film reeling end 10, it is possible to obtain be wound into the polarizing film of roll.
It should be noted that in present embodiment, it is possible to implementing after the lamination process of the suitable laminate surface protection thin film in the one or both sides, surface of the polarizing film being dried by drying process etc., implementing coiling process.
Final total stretching ratio of the polarizing film so manufactured preferably is in any one stretching ratio within the scope of 5.25 ~ 8.0 times relative to reel thin film, and more preferably at any one stretching ratio within the scope of 6.0 ~ 7.0 times.
Preferably above-mentioned stretching ratio is because, and when final total stretching ratio is less than 5.25 times, there is the worry being difficult to obtain having the polarizing film of high polarized light property, during more than 8.0 times, there is thin film and the worry of fracture occurs.
(connection operation)
Above-mentioned operation is implemented, it is possible to effectively manufacture polarizing film continuously by the total length at reel thin film.And, in the present embodiment, implement following connection operation: before this reel roller is all fed in stretching device, stretch out polyvinyl alcohol resin thin film (reel thin film) from next reel roller, the terminal part 1a of the leading section 1b of this new reel thin film with the reel roller implementing each operation in stretching device is connected.
This connection operation such as enforcement of getting off: make the interface side in the region becoming lap of at least one in terminal part 1a and leading section 1b absorb water, terminal part 1a is overlapping with leading section 1b, laser is made to be irradiated in the swelling region by above-mentioned water suction, the water existing for region that laser has been inhaled water by this is made to absorb, thus carrying out laser welding.Thus, generating heat, make the molecular motion in this region enliven in the above-mentioned region having inhaled water, it is compatible to bring out interface, thus by lap welding.
It addition, as laser, the laser in 1.9 μm ~ 2.2 μ m with spike length is irradiated in the above-mentioned region having inhaled water, the water existing for region that above-mentioned laser has been inhaled water by this is made to absorb, thus implementing above-mentioned laser welding.
In addition, in this water suction, the above-mentioned interface side making the region becoming lap of at least one in terminal part 1a and leading section 1b absorbs water, making the thickness (being set to D2) of the above-mentioned zone relative to drying regime, the thickness (being set to D1) of the above-mentioned zone after water suction is more than 101% and less than 110%.
The thickness D2 of drying regime arranges 1 hour, the thickness of weight above-mentioned zone when reaching poised state under the environment of 83 DEG C, thickness D1 after water suction is that in the above-mentioned region becoming lap after water suction, the thickness in this region reaches thickness during poised state.
Thickness D1(after the thickness D2 of described drying regime, water suction is with reference to Fig. 4) method recorded in embodiment can be used to measure.It addition, Fig. 3, schematically show the example (accompanying drawing labelling 1ba) of the above-mentioned interface side of the leading section 1b part swelling due to water suction in 4.
The above-mentioned interface side making the above-mentioned region becoming lap absorbs water so that the thickness D1 after water suction relative to the thickness D2 of drying regime less than 101% time, the amount of laser light that the water existed in the above-mentioned region having inhaled water and swelling region absorbs is very few.It is thus impossible to produce to be enough to make the heat of the interface welding of lap, it is possible to can not by 2 abundant weldings of reel thin film.It addition, thus, laser induced plasma flow field reduces, and manufactures efficiency and is also possible to reduce.
On the other hand, by absorbing water so that the thickness D1 after water suction reaches more than 101% relative to the thickness D2 of drying regime, it is possible to make the amount of laser light that the water existed in the above-mentioned region becoming lap absorbs become fully many.Thus, produce to be enough to make the heat of the interface welding of lap, it is possible to by 2 abundant weldings of reel thin film.It addition, laser induced plasma flow field thus can also be improved.Consider these viewpoints, it is preferable that absorb water to the thickness D1 after so that water suction and reach more than 103% relative to the thickness D2 of drying regime, reach more than 105% it is preferred that absorb water to.
It addition, when absorbing water to the thickness D2 relative to drying regime of the thickness D1 after water suction more than 110%, the quantitative change of the laser that the water that the above-mentioned region having inhaled water exists absorbs obtains too much.Therefore, producing superfluous heat, thus, in leading section 1b, terminal part 1a, due to heating, the region of amorphization is from interface to thickness direction hyper expanded, and therefore, the mechanical strength at junction surface is likely to decrease.So, owing to the mechanical strength at junction surface reduces, in above-mentioned stretching device, when stretching junction surface with the stretching ratios of more than 5.25 times, rupture, it is possible to polarizing film cannot be continuously manufactured by.It addition, terminal part 1a, leading section 1b are excessively swelling in a thickness direction, therefore, with pairing the leading section 1b of side, terminal part 1a overlapping time, it is easy to occur both positions to offset, it is possible to be difficult to position.
As it has been described above, absorb water to the thickness D1 after water suction when being more than 101% and less than 110% relative to the thickness D2 of drying regime, the moisture content in the above-mentioned region having inhaled water is preferably more than 3 mass % and below 40 mass %, more preferably more than 5 mass % and below 20 mass %.This is because, when moisture content is lower than 3 mass %, for the water that the above-mentioned region having inhaled water exists, it is difficult to fully absorb laser, it is possible to cause that the fusion efficiency of laser induced plasma flow field and laser welding reduces.On the other hand, this is because, during more than 40 mass %, the above-mentioned region transitions having inhaled water is swelling, and by time overlapping with leading section 1b for terminal part 1a, position skew likely becomes big.
Above-mentioned method of attachment specifically can such as enforcement of getting off.Such as, by having the water-holding portion 20 of ultrasonic sprayer, water is coated on the surface of the leading section 1b that the downside in the terminal part 1a of the thin film got ahead and the leading section 1b of new thin film configures, so as to absorb water.Now, make this water absorbent surface so that swelling leading section 1b(is with reference to Fig. 4) the thickness thickness relative to the leading section 1b of drying regime be more than 101% and less than 110%.Hereafter, platform 40 make new and old reel thin film configure overlappingly up and down so that the width of the overlapping portion of terminal part 1a and leading section 1b is more than 0.1mm and less than 50.0mm.And, with aforementioned pressure-producing part 50, this lap is pressurizeed, and, the laser in 1.9 μm ~ 2.2 μ m with spike length is irradiated in the above-mentioned region having inhaled water, so as to the water existed by this region absorbs.Thus, as it has been described above, make resin compatible with each other in film interface, form weld portion 30.As such, it is possible to reel thin film is connected.
Existing laser welding is to use the pigment of the pigment of phthalocyanine system, naphthalene phthalocyanine system, and the form of the laser being radiated within the scope of 800nm ~ 1200nm to have spike length is implemented.But, in the present embodiment, as it has been described above, utilize the laser in 1.9 μm ~ 2.2 μ m with spike length, and, replace pigment as above, use water as light absorber.
Therefore, it can implement the joint of polyvinyl alcohol resin thin film, and, do not use the expensive light absorber such as pigment of the pigment of phthalocyanine system, naphthalene phthalocyanine system, or, also do one's utmost to lower its consumption even if using.Therefore, it can lower cost of material.It addition, when not using light absorber, due to the equipment that can bear the painting process for implementing this light absorber, the process management that adopts this painting process to bring, the cost in operation therefore can be lowered.
Additionally, be as noted previously, as the use that can suppress light absorber, accordingly, as the reel thin film of polarizing film, it is provided that the reel thin film that the probability of stained medicinal liquid is low.It addition, so, the probability of stained medicinal liquid is low, therefore can cut down medicinal liquid and purify required man-hour, and, can prevent following situation from occurring: pigment is attached to and reduces yield rate as in the part of polarizing film utilization beyond connecting portion.
It addition, as in the present embodiment, when implementing laser welding, from the viewpoint of stretching ratio, the welding of Billy's heat sealing machine is favourable.
This is specifically described.Such as, the above-mentioned stretching device of reel membrane supplying of big consolidation zone will be defined with heat sealing machine at junction surface and periphery thereof owing to engaging, it is stretched to total stretching ratio when reaching about 5.25 times, there is no in above-mentioned consolidation zone and be stretched, stress concentrates on the boundary member between this consolidation zone and the region not having solidification.As a result, at described boundary member, during stretching, there is reel film breaks.
On the other hand, in the present embodiment, as mentioned above, by carrying out laser welding, optionally can only make (partly) interface in the intersection of new and old reel thin film and neighbouring heating thereof thus after being heated, owing to being local, it is possible to be quenched, accordingly it is possible to prevent junction surface and periphery thereof solidify.Thus, it is suppressed that be subject to the solidification in the region of welding heat impact, it is possible to make the region being subject to the impact of this heat and the draftability not having thermally influenced region is similar to, therefore, it can suppress the fracture of reel thin film, and the stretching under high stretching ratio can be implemented.
So, in the connection operation of present embodiment, it is possible to form polyvinyl alcohol resin thin film conjugant, even if it is with the high stretching ratio stretching of require to give high polarisation function more than 5.25 times, the probability of fracture is also very low.Additionally, such that make to stretch with high stretching ratio, fracture also can be suppressed, therefore, when stretching junction surface and periphery thereof, it is possible to do not change stretching condition ground and stretch the reel thin film of more than 2 continuously.Therefore, when making polarizing film, it is possible to obtain the effect that working performance improves, productivity ratio improves, yield rate improves and material unaccounted-for (MUF) is cut down.
As it has been described above, in the present embodiment, it is possible to formed and there is the conjugant of the polyvinyl alcohol resin thin film of stretching being suitable in medicinal liquid etc. the junction surface of impregnation process, being resistant under high stretching ratio.Furthermore it is possible to effectively manufacture polarizing film.
It should be noted that utilize the thickness of the polarizing film of manufacture method manufacture that present embodiment illustrates to be not particularly limited, it is preferable that thickness is 5 μm～40 μm.
If thickness is more than 5 μm, then mechanical strength will not reduce, if it addition, be less than 40 μm, then optical characteristics will not reduce, and is applied to image display device and also can realize slimming.
The polarizing film utilizing present embodiment manufacture can as polarizing film being laminated in liquid crystal cell substrate etc. for liquid crystal indicator etc..It addition, this polarizing film is except liquid crystal indicator, it is also possible to use as the polarizing film in the various image display devices such as el display device, plasma display and Field Emission Display.
It should be noted that actually used time, it is also possible to form optical thin film or implement various surface treatment and in the image display devices such as liquid crystal indicator on the two sides of above-mentioned polarizing film or the one side various optical layers of stacking.
As aforementioned optical layer; as long as meeting required optical characteristics to be just not particularly limited; such as; beyond the protective clear layer for the purpose of protection polarizing film, the aligned liquid-crystal layer for the purpose of vision compensation etc., the adhesive layer for other thin film of stacking, it is also possible to the thin film being used in the formation of the image display devices etc. such as polarization conversion element, reflecting plate, half transmitting plate, polarizer (including 1/2,1/4 equiwavelength's plate (λ plate)), vision compensation film, bright enhancement film using.
As aforementioned surfaces process, it is possible to list hard painting process, antireflection process, by antiseized, non-proliferation or anti-dazzle for the purpose of surface treatment.
As mentioned above, the joint method of the polyvinyl alcohol resin thin film of present embodiment is by overlapping with the surface of the 2nd polyvinyl alcohol resin thin film 1 for the surface of the 1st polyvinyl alcohol resin thin film 1, the joint method of the polyvinyl alcohol resin thin film engaged, the interface side making the region becoming lap of at least one the polyvinyl alcohol resin thin film in aforementioned 1st polyvinyl alcohol resin thin film the 1 and the 2nd polyvinyl alcohol resin thin film 1 absorbs water, make the thickness D2 of the aforementioned areas relative to drying regime, the thickness D1 of the aforementioned areas after water suction is more than 101% and less than 110%, after this water suction, make aforementioned 1st polyvinyl alcohol resin thin film the 1 and the 2nd polyvinyl alcohol resin thin film 1 overlapping, the laser R in 1.9 μm ~ 2.2 μ m with spike length is irradiated in the aforementioned region (in the present embodiment for 1ba) having inhaled water, the aforementioned laser R water existing for region having been inhaled water by this is made to absorb, thus the interface of the aforementioned lap of laser welding.
So, by making the above-mentioned interface side in the region becoming above-mentioned lap of at least one of the 1st polyvinyl alcohol resin thin film the 1 and the 2nd polyvinyl alcohol resin thin film 1 absorb water, it is possible to make this become the region of lap swelling.Additionally, after water suction, make the 1st polyvinyl alcohol resin thin film the 1 and the 2nd polyvinyl alcohol resin thin film 1 overlapping, laser R is irradiated in the above-mentioned region having inhaled water, laser R water existing for this region is made to absorb, thus so as to generate heat, make the molecular motion in this region enliven in the above-mentioned region having inhaled water, it is possible to bring out interface compatible, thus, it is possible to by lap welding.
Thus, it is possible to suppress in the past for absorbing the use of the light absorber of laser.Therefore, it can be formed and there is the resin film amphiont being suitable to carry out the junction surface of impregnation process in medicinal liquid etc..
Additionally, by making the above-mentioned region water suction becoming lap, so as to swelling so that relative to the thickness of drying regime, the thickness of the above-mentioned zone after water suction is more than 101% and less than 110%, such that it is able to the amount of the laser absorbed by the water that the above-mentioned region having inhaled water exists is set as appropriate amount.Thus, it is possible to produce to be suitable for the heat of the interface welding of lap, by the suitably welding of this lap.
Therefore, it can suitably suppress the solidification of junction surface and periphery thereof.
Additionally, by being used in the laser in 1.9 μm ~ 2.2 μ m with spike length, it is possible to the absorption sensitivity of raising laser for water, therefore, it can effectively make polyvinyl alcohol resin film heating.
Therefore, it can be formed have and be suitable in medicinal liquid etc., carrying out the junction surface of impregnation process, being resistant to the conjugant of the polyvinyl alcohol resin thin film of the stretching of high stretching ratio.
Additionally, the manufacture method of the polarizing film of present embodiment is to impregnate in medicinal liquid and stretch by making to be connected to the reel thin film of more than 2 polyvinyl alcohol resin thin film, thus making the manufacture method of the polarizing film of polarizing film, the joint method of the polyvinyl alcohol resin thin film of the aforementioned present invention of connecting through of aforementioned reel thin film is implemented.
So, make polarizing film by the polyvinyl alcohol resin thin film 1 to engage with above-mentioned joint method as reel thin film, in medicinal liquid 4 during dipping, it is possible to suppress the stained of this medicinal liquid.It addition, when implementing the stretching of high stretching ratio, it is possible to suppress the fracture of reel thin film.Additionally, such that make to implement to stretch with high stretching ratio, fracture also can be suppressed, it is not necessary in order to avoid fracture only in reducing the tedious operations that stretching ratio carries out stretching when stretching junction surface and periphery thereof, therefore can effectively make polarizing film.
Additionally, in the present embodiment, as polyvinyl alcohol resin thin film, the reel thin film used for manufacturing polarizing film can be listed to engage example during polyvinyl alcohol resin thin film, but the joint method of the polyvinyl alcohol resin thin film of the present invention need not be confined to the joint method of above-mentioned reel thin film.It addition, the manufacture method of the polarizing film of the present invention is also not necessarily limited to the manufacture method shown in above-mentioned embodiment.Additionally, the joint method of polyvinyl alcohol resin thin film of the present invention and the manufacture method of polarizing film are not limited to above-mentioned action effect.
Embodiment
Then, enumerate embodiment to illustrate in greater detail the present invention, but the present invention is not limited by these embodiments.
(primary condition)
Reel thin film:
Polyvinyl alcohol resin (PVA) thin film (KURARAYCO., LTD. manufacture, 30mm, and manufacturer indicates thickness 75 μm)
Overlapping widths:
1.5mm width
The coating process of water:
Ultrasonic type aerosol apparatus (some footpath 5mm φ, flow 0.4mL/min, scanning speed 100mm/sec, application frequency 1 time)
Laser:
Thulium doped optical-fiber laser (wavelength 2 μm, power 100W, spot diameter 2mm φ, power density 3183W/cm2, scanning speed 50mm/sec, application frequency 1 time, accumulative irradiation dose: 127.3J/cm2, flat top beam)
Pressure-producing part:
Quartz glass plate (10mm is thick)
Pressurized conditions:
To increase the weight of 50kgf/cm in reel film overlay portion2Pressing
(assay method of the thickness of reel thin film)
The thickness of drying regime
PVA film is cut into the thin rectangle of 1mm width × 7mm length, makes test film.Use drying machine (manufacture of Sanyo Electric company), test film is arranged under the environment of 83 DEG C 1 hour so that its weight reaches poised state.Take out after test film from this drying machine, be set in rapidly on stationary fixture, impregnate in liquid nitrogen, so as to freezing.And, freezing test film is cut off, manufactures with CryoFIBSEM(FEI company, HeliosNanoLab600) carry out cross-section, the thickness of the drying regime of determination test sheet (PVA film).Wherein, the condition of CryoFIBSEM is: accelerating potential 1kV, observes multiplying power 500 times and 1000 times.
Thickness after water suction
The PVA film same with being used for the thin film that manufactures is cut into the thin rectangle of 1mm width × 50mm length, makes test film.The condition same with the coating process of above-mentioned water and following each condition is used to make test film absorb water.So, after making test film water suction, being set on stationary fixture, Absorb Water is immersed in liquid nitrogen after terminating latter 1 minute, makes test film freezing.And, test film is cut off, under condition similar to the above, carries out section observation with CryoFIBSEM, the thickness after determination test sheet (PVA film) water suction.
(embodiment 1)
By ultrasonic sprayer water coated stacked 2 as on the reel thin film of the downside in the reel thin film of PVA film.That is, be coated with water distribution according to above-mentioned primary condition so that include the upside in the reel thin film of downside, constitute the part with the interface of reel thin film, so that the interface side of the reel thin film of downside absorbs water, so as to swelling.
Now, the thickness of the drying regime of PVA film is 74 μm, and the thickness after water suction is 76 μm.Being calculated the thickness after relative to the water suction of the thickness of drying regime by (thickness of the thickness/drying regime after water suction) × 100 by these values, result is 103%.
And, as it has been described above, make reel thin film and the reel film overlay of the downside absorbed water of upside, according to the above-mentioned primary condition top irradiating laser from the reel thin film of upside, two reel thin film are engaged.As a result, do not use special light absorber, confirm there is good zygosity.It addition, the junction surface of gained conjugant is impregnated 1 minute in the water of 30 DEG C as a result, confirm not from the foreign body of junction surface dissolution.
Further, in gained conjugant, about 50mm length is cut out before and after junction surface, swelling bath stretches with total stretching ratio of 2.6 times, stretching with total stretching ratio of 3.4 times in dye bath, in crosslinking bath, the total stretching ratio with 3.6 times stretches, and stretches with total stretching ratio of 5.5 times in stretch bath, impregnating in washing bath further, interval manufactures polarizing film.As a result, it is possible to manufacture polarizing film, and conjugant does not rupture.It can therefore be seen that the reel thin film of more than 2 can be used, it is continuously manufactured by polarizing film.
(embodiment 2)
Except being 0.3mL/min by the flow set of ultrasonic sprayer, application frequency (scanning times) is set as beyond 2 times, according to above-mentioned primary condition, is coated by water on the reel thin film of downside.It addition, except being that 80W, power density are set as 2546W/cm by the power setting of laser2, accumulative irradiation dose be set as 101.9J/cm2In addition, similarly to Example 1, the reel thin film of upside is engaged with the reel thin film of downside.Now, the thickness of the drying regime of PVA film is 60 μm, and the thickness after water suction is 63 μm.Being calculated the thickness after relative to the water suction of the thickness of drying regime by (thickness of the thickness/drying regime after water suction) × 100 by these values, result is 105%.
So, joint as a result, do not use special light absorber, confirm have good zygosity.It addition, similarly to Example 1, when being impregnated in water at the junction surface of gained conjugant, confirm the foreign body not caused because of junction surface.
Additionally, use gained conjugant, when interval manufactures polarizing film similarly to Example 1, it is possible to manufacture polarizing film without fracture.It can therefore be seen that the reel thin film of use more than 2, manufacture polarizing film serially.
(embodiment 3)
Except being 0.3mL/min by the flow set of ultrasonic sprayer, according to above-mentioned primary condition, water is coated on the reel thin film of downside.It addition, similarly to Example 1 when, the reel thin film of upside is engaged with the reel thin film of downside.Now, the thickness of the drying regime of PVA film is 75 μm, and the thickness after water suction is 78 μm.Being calculated the thickness after relative to the water suction of the thickness of drying regime by (thickness of the thickness/drying regime after water suction) × 100 by these values, result is 104%.
So, joint as a result, do not use special light absorber, confirm have good zygosity.It addition, similarly to Example 1, when being impregnated in water at the junction surface of gained conjugant, confirm the foreign body not caused because of junction surface.
Additionally, use gained conjugant, when interval manufactures polarizing film similarly to Example 1, it is possible to manufacture polarizing film without fracture.It can therefore be seen that the reel thin film of use more than 2, manufacture polarizing film serially.
(embodiment 4)
Except application frequency being set as except 2 times, according to above-mentioned primary condition, water is coated on the reel thin film of downside.It addition, similarly to Example 1 when, the reel thin film of upside is engaged with the reel thin film of downside.Now, the thickness of the drying regime of PVA film is 73 μm, and the thickness after water suction is 79 μm.Being calculated the thickness after relative to the water suction of the thickness of drying regime by (thickness of the thickness/drying regime after water suction) × 100 by these values, result is 108%.
So, joint as a result, do not use special light absorber, confirm have good zygosity.It addition, similarly to Example 1, when being impregnated in water at the junction surface of gained conjugant, confirm the foreign body not caused because of junction surface.
Additionally, use gained conjugant, when interval manufactures polarizing film similarly to Example 1, it is possible to manufacture polarizing film without fracture.It can therefore be seen that the reel thin film of use more than 2, manufacture polarizing film serially.
(comparative example 1)
Replace water, (U.S. GentexCorporation manufactures commodity in use name " ClearweldLD120C ", solvent acetone) near-infrared absorption agent as light absorber, scanning speed is set as 200mm/sec, in addition, according to above-mentioned primary condition, similarly to Example 1, the reel thin film of upside is engaged with the reel thin film of downside.
As a result, confirm there is good zygosity.But, when being impregnated in water at the junction surface of gained conjugant similarly to Example 1, it is visually confirmed to be the foreign body that derives from light absorber from the situation of junction surface dissolution.
From the above, it can be seen that according to the present invention it is possible to formed to have and be suitable in medicinal liquid etc. the junction surface of impregnation process, be resistant to the conjugant of the polyvinyl alcohol resin thin film of the stretching of high stretching ratio.
As above embodiments of the present invention and embodiment are illustrated, but the feature being just expected to each embodiment and embodiment from the beginning is appropriately combined.Additionally, it is believed that presently disclosed embodiment and embodiment are illustration in all respects, be not that system is sex-limited.The scope of the present invention is not by above-mentioned embodiment and embodiment but represented by claims, it is intended to include all changes in the meaning being equal to claims and scope.

Claims (2)

1. a joint method for polyvinyl alcohol resin thin film, it is the joint method of polyvinyl alcohol resin thin film that the surface making the 1st polyvinyl alcohol resin thin film is overlapping with the surface of the 2nd polyvinyl alcohol resin thin film, engage, wherein,
The interface side making the region becoming lap of at least one the polyvinyl alcohol resin thin film in described 1st polyvinyl alcohol resin thin film and the 2nd polyvinyl alcohol resin thin film absorbs water, make the thickness in the described region relative to drying regime, the thickness in the described region after water suction reaches more than 101% and less than 110%
After this water suction, by described 1st polyvinyl alcohol resin thin film and the 2nd polyvinyl alcohol resin film overlay,
The described area illumination having inhaled water is had in 1.9 μm ~ 2.2 μ m the laser of spike length, makes the water existing for region that described laser has been inhaled water by this absorb, thus the interface of lap described in laser welding.
2. a manufacture method for polarizing film, it is to impregnate in medicinal liquid and stretch by making to be connected to the reel thin film of more than 2 polyvinyl alcohol resin thin film, thus making the manufacture method of the polarizing film of polarizing film, wherein,
The joint method connecting through the polyvinyl alcohol resin thin film described in claim 1 described in described reel thin film is implemented.
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