CN105980132A - Optical film manufacturing method - Google Patents
Optical film manufacturing method Download PDFInfo
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- CN105980132A CN105980132A CN201580004467.6A CN201580004467A CN105980132A CN 105980132 A CN105980132 A CN 105980132A CN 201580004467 A CN201580004467 A CN 201580004467A CN 105980132 A CN105980132 A CN 105980132A
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- Prior art keywords
- stretching
- width
- grip separation
- blooming
- duplexer
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/20—Edge clamps
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Polarising Elements (AREA)
Abstract
This optical film manufacturing method involves a step in which an elongate resin substrate is stretched in the length direction while being conveyed in said length direction and is subsequently contracted in the width direction (stretching and contracting step). Using a tenter stretching device provided with multiple clips as holding means for holding the elongate resin substrate, said stretching and contracting step involves holding both ends of the elongate resin substrate at a conveyance-direction clip interval L1, stretching the elongate resin substrate in the length direction by expanding said clip interval from L1 to L2, and subsequently contracting the elongate resin substrate in the width direction by reducing the width-direction clip interval. The clip interval L1 is less than or equal to 60mm, and the clip interval L2 is an interval at which interference does not occur between clips when the width-direction clip interval is reduced.
Description
Technical field
The present invention relates to the manufacture method of a kind of blooming.
Prior art
Previously, it is known to following technology: grasp and transport the film of long shape by tentering fixture, and expand
The interval of the conveyance direction of this tentering fixture, thereby stretches, and makes this film to big with conveyance direction
Cause orthogonal direction to shrink and make blooming (claim 7 of patent documentation 1).This kind is drawn
For stretching technology, there are the following problems, i.e. film (such as, the end of the width of film after stretching
Region) produce optical characteristics inequality.Therefore, it is previously utilizing slit processing etc. and will produce uneven district
Territory cuts off removes, and only will be used as blooming without uneven region.
On the other hand, in recent years, according to the requirement of the maximization of display, it is desirable to the film conduct of wide cut
Blooming for it.Therefore, above by slit processing, the cut-off region removed is more satisfactory is
The least.
[prior art literature]
[patent documentation]
Patent documentation 1: Japanese Patent Laid-Open 2008-26881 publication
Summary of the invention
[problem that invention to be solved]
The present invention is to solve that above-mentioned problem completes, its main purpose is to provide a kind of blooming
Manufacture method, this manufacture method includes using tentering stretching device by the resin molding of long shape to conveyance direction
Carry out the operation stretching and shrinking in width, and this manufacture method can suppress the film after stretching to produce
The inequality of optical characteristics.
[solving the means of problem]
The present invention provides the manufacture method of a kind of blooming, and this manufacture method comprises the resin molding of long shape
While transporting while stretching in this length direction in length direction, the operation then shunk in width
(stretching-contraction process).About the method, this stretching-contraction process includes that use possesses as this length
The tentering stretching of multiple fixtures of the grasping mechanism of the resin molding of shape is put, with between the fixture of conveyance direction
Grasp the edge, both sides of the resin molding of this long shape every L1, this grip separation be extended to L2 from L1,
Thereby the resin molding of this long shape is stretched in length direction, then, by reducing the fixture of width
Situation about being spaced and shunk in width by the resin molding of this long shape, this grip separation L1 is 60
Below mm, when this grip separation L2 is the grip separation reducing width, fixture will not be done each other
The interval disturbed.
In an embodiment, above-mentioned resin molding is 1.1 to the stretching ratio (L2/L1) of length direction
Times～6.0 times.
In an embodiment, in above-mentioned stretching-contraction process, in by reducing width
Grip separation and period of being shunk in width by above-mentioned resin molding, by by the fixture of conveyance direction
It is spaced and is extended to L3 from L2 and above-mentioned resin molding is stretched in length direction.
In an embodiment, above-mentioned blooming is polarizing coating.
Another way according to the present invention, it is provided that a kind of optical laminate.This optical laminate has:
The blooming that manufactured by the manufacture method of above-mentioned blooming and be configured at least the one of this blooming
The base material of side.
[invention effect]
In the manufacture method of the present invention, use and possess to grasp multiple fixtures of the resin molding of long shape
Tentering stretching device, the grip separation of initial conveyance direction is set to specifically be spaced following and enters
Row, to the stretching of length direction, then, carries out the contraction to width.Thereby, can suppress to be obtained
The blooming obtained produces the inequality of optical characteristics and improves internal homogeneity.It addition, can avoid to width
Fixture interference each other during the contraction in direction.
Accompanying drawing explanation
Fig. 1 be an example of the spendable stretching device of the manufacture method to the present invention be monolithically fabricated into
The approximate vertical view of row explanation.
Fig. 2 is the major part approximate vertical view of the stretching device of Fig. 1.
Fig. 3 is the major part approximate vertical view of the stretching device of Fig. 1.
Fig. 4 is the skeleton diagram that the example to contraction-stretching process illustrates.
Fig. 5 is the skeleton diagram that another example to contraction-stretching process illustrates.
In the stretched film that Fig. 6 is obtained by expression, produce optical characteristics uneven region width with
The chart of the relation of grip separation L1.
Detailed description of the invention
A. the manufacture method of blooming
The manufacture method of the blooming of the present invention includes: removed in length direction by the resin molding of long shape
Send while stretching in this length direction, the operation (stretching-contraction process) then shunk in width.
This stretching-contraction process includes following situation: use the grasping machine possessing the resin molding as this long shape
The tentering stretching of multiple fixtures of structure is put, and grasps this long shape with grip separation L1 of conveyance direction
The edge, both sides of resin molding, is extended to L2 by this grip separation from L1, thereby by the resin of this long shape
Film stretches in length direction, then, by the grip separation of reduction width by the tree of this long shape
Adipose membrane shrinks in width.The resin molding of the long shape used in the manufacture method of the present invention can be single
The resin molding of layer, also can be that the duplexer of more than two-layer is (such as, in the manufacturer of following polarizing coating
In method, the duplexer of thermoplastic resin base material and polyvinyl alcohol resin layer is corresponding to the resin of long shape
Film).
As the blooming that can be manufactured by the manufacture method of the present invention, as long as can be above-mentioned by comprising
The manufacture method of stretching-contraction process manufactures, then can be the most suitable blooming.As
The concrete example of this blooming, it is preferable to illustrate polarizing coating, optical compensation films etc., it may be more preferable to ground example
Show polarizing coating.Hereinafter, to the embodiment (that is, the manufacture method of polarizing coating) that blooming is polarizing coating
Illustrate, but the manufacture method of the present invention is not limited to this embodiment.
A. the manufacture method of polarizing coating
The manufacture method of the polarizing coating of the present invention includes: form polyvinyl alcohol on thermoplastic resin base material
(hereinafter referred to as " PVA ") resin and the operation (duplexer manufacturing process) of making layer stack；
With by this duplexer while in length direction transport while stretching in this length direction, then in width side
To the operation (stretching-contraction process) shunk.Hereinafter, each operation is illustrated.
A-1. duplexer manufacturing process
Duplexer makes by forming PVA resin on thermoplastic resin base material.Thermoplasticity
As long as resin base material can then use appoint from a side bearing PVA resin (polarizing coating obtained)
The suitable composition of meaning.
As the formation material of thermoplastic resin base material, include, for example: polyethylene terephthalate
Be the olefin-based resins such as ester system resin, cyclic olefine resin, polypropylene such as resin, polyamide series resin,
Polycarbonate-based resin, their copolymer resin etc..Wherein, preferably cyclic olefine resin (example
Such as, norbornene resin), amorphous polyethylene terephthalate system resin.As amorphous
The concrete example of the polyethylene terephthalate system resin of matter, can enumerate: and then comprise M-phthalic acid
As the copolymer of dicarboxylic acids or and then comprise the cyclohexanedimethanol copolymer as glycol.
The drawing process of thermoplastic resin base material can use the most suitable method.Specifically, may be used
Stretch for fixing end, also can be free end stretching.The stretching of thermoplastic resin base material can be entered in a stage
OK, can also carry out the multistage.When the situation carried out with the multistage, following is thermoplastic resin-based
The stretching ratio of material is the product of the stretching ratio in each stage.It addition, the stretching mode in this operation is also
It is not particularly limited, can be aerial stretching mode, also can be stretching mode in water.
About the draft temperature of thermoplastic resin base material, the formation material of visual thermoplastic resin base material,
Stretching mode etc. and be set as arbitrary appropriate value.About draft temperature, for representativeness, for heat
More than the glass transition temperature (Tg) of plastic resin base material, preferably more than Tg+10 DEG C, and then
It is preferably Tg+15 DEG C～Tg+30 DEG C.In employing water, stretching mode is as stretching mode, and makes
With amorphous polyethylene terephthalate system resin as the formation material of thermoplastic resin base material
Situation time, draft temperature can be made to be less than the glass transition temperature of thermoplastic resin base material (such as,
60 DEG C～100 DEG C).
In advance thermoplastic resin base material can be implemented surface modification treatment (such as, sided corona treatment etc.), also
Easy adhesive linkage can be formed on thermoplastic resin base material.By carrying out above-mentioned process, thermoplasticity can be improved
Resin base material and the adhesion of PVA resin.Furthermore, surface modification treatment and/or easily adhesive linkage
Formation can carry out before above-mentioned stretching, also can carry out after above-mentioned stretching.
The forming method of above-mentioned PVA resin can use the most suitable method.It is preferably in reality
Execute and be coated with the coating fluid comprising PVA system resin on the thermoplastic resin base material that overstretching processes and carry out
It is dried, thereby forms PVA resin.
As above-mentioned PVA system resin, the most suitable resin can be used.Include, for example: poly-second
Enol, ethylene-vinyl alcohol copolymer.Polyvinyl alcohol can obtain by making saponifying polyvinyl acetate.
Ethylene-vinyl alcohol copolymer can obtain by making vinyl-vinyl acetate copolymer saponification.PVA system
The saponification degree of resin is usually 85 moles of %～100 moles of %, preferably 95.0 moles %～99.95
Mole %, and then preferably 99.0 moles %～99.93 moles of %.Saponification degree can be according to JIS K
6726-1994 and obtain.Durability can be obtained by using the PVA system resin of above-mentioned saponification degree
Excellent polarizing coating.When the situation that saponification degree is too high, there is the easy gelation of coating fluid, and become difficult
To form the probability of uniform coated film.
The visual purpose of average degree of polymerization of PVA system resin and properly select.Average degree of polymerization is usual
It is 1000～10000, preferably 1200～4500, and then preferably 1500～4300.Furthermore,
Average degree of polymerization can be obtained according to JIS K 6726-1994.
Above-mentioned coating fluid, for representativeness, forms for making above-mentioned PVA system resin be dissolved in solvent
Solution.As solvent, include, for example: water, dimethyl sulfoxide, dimethylformamide, diformazan
The polyalcohols such as yl acetamide, N-methylpyrrole pyridine ketone, various glycols, trimethylolpropane,
The amine such as ethylenediamine, diethylenetriamines.They can be used alone, or is used in combination of two or more.
Wherein, preferably water.The PVA system resin concentration of solution is relative to solvent 100 weight portion, preferably
It is 3 weight portions～20 weight portions.If above-mentioned resin concentration, then can be formed and be close contact in thermoplastic resin
The uniform coated film of aliphatic radical material.
Also additive can be coordinated to coating fluid.As additive, include, for example: plasticizer, surface
Activating agent etc..As plasticizer, include, for example: the polyhydric alcohol such as ethylene glycol or glycerol.As surface
Activating agent, include, for example: nonionic surfactant.They can improve further and to be obtained
Use for the purpose of the homogeneity of PVA resin or dyeability, draftability.
As the coating process of coating fluid, the most suitable method can be used.Include, for example: roller
Coating, method of spin coating, bar rubbing method, Dipcoat method, mould mouth rubbing method, curtain type are coated with
Method, spraying process, knife coating (funny point-type scraper for coating method etc.) etc..
Above-mentioned baking temperature is preferably the glass transition temperature (Tg) of thermoplastic resin base material below, enters
And preferably less than Tg-20 DEG C.By being dried with said temperature, can prevent terminating in formation PVA
Thermoplastic resin base material deformation before resin, thus obtained PVA resin can be prevented
Orientation is deteriorated.So, thermoplastic resin base material can deform together with PVA resin well,
Thus contraction and the stretching of following duplexer can be carried out well.Its result is, can be to PVA system
Resin bed gives good orientation, thus can obtain the polarizing coating of the optical characteristics with excellence.This
Place, so-called " orientation ", it is intended that the orientation of the strand of PVA resin.
A-2. contraction-stretching process
Then, above-mentioned duplexer being transported while stretching in this length direction in length direction, continuing
And shrink in width.Furthermore, essentially become as the length direction of draw direction and to be obtained
The absorption direction of principal axis of polarizing coating.
In the present invention, stretching and the contraction of above-mentioned duplexer are carried out in the following way: use and possess
As the tentering stretching device of multiple fixtures of the grasping mechanism of duplexer, with between the fixture of conveyance direction
Every the edge, both sides of L1 grasping duplexer, this grip separation is extended to L2 from L1, thereby by layer
Stack in length direction stretch, then, by reduce width grip separation and by duplexer in
Width shrinks.Also can be in the grip separation by reduction width by duplexer in width side
To the period shunk, by by the grip separation of conveyance direction from L2 be extended to L3 and by duplexer
Stretch in length direction.Furthermore, grip separation L1 is below 60mm, grip separation L2 be
The interval that when reducing the grip separation of width, fixture does not interferes with each other.
As above-mentioned tentering stretching device, such as, can use following stretching device, this stretching device includes:
There is track space from certain line part and track space from a tracking of the tapered portion being continuously reduced
Road and grip separation can be changed while multiple fixtures of dividing a word with a hyphen at the end of a line on each track.Draw according to this kind
Stretch device, by grasping with fixture under the state of edge, both sides of duplexer, change conveyance direction
Grip separation (spacing jig on same track from) and grip separation (the different tracks of width
On spacing jig from), thus stretching and the contraction of duplexer can be carried out.
Fig. 1 be an example of the spendable stretching device of the manufacture method to the present invention be monolithically fabricated into
The approximate vertical view of row explanation.While with reference to Fig. 1, spendable to the manufacture method of the present invention
Stretching device illustrates.Stretching device 100 symmetrically has ring under overlooking in the left and right sides
Shape track 10L and circular orbit 10R.Furthermore, in this specification, from the entrance side of duplexer
Observe, the circular orbit in left side is referred to as the circular orbit 10L in left side, the circular orbit on right side is claimed
Circular orbit 10R for right side.It is each configured with stacking on circular orbit 10L, 10R of left and right
Multiple fixtures 20 of body grasping.Fixture 20 is guided and the most touring movement by each track.
The most touring movement of fixture 20 on the circular orbit 10L in left side, the circular rails on right side
The most touring movement of fixture 20 on road 10R.In stretching device, from duplexer
Move into side towards taking out of side, be sequentially provided with grip areas A, MD stretch zones B, TD shrink
Region C and releasing region D.Furthermore, these each regions mean substantially to grasp duplexer,
MD stretching, TD shrink (or TD shrinks and stretches with MD) and the region released, and are not meant as
Mechanically, interval independent in structure.It addition, each region that should be noted in the stretching device of Fig. 1
The ratio of length is different from the ratio of actual length.
In grip areas A and MD stretch zones B, circular orbit 10R, 10L quilt of left and right
Regard as track space from certain line part.For representativeness, circular orbit 10R, 10L of left and right
In the following manner constitute: with correspondence become process object duplexer original width track space from
It is generally parallel to each other.In TD constriction zone C, circular orbit 10R, 10L of left and right are considered
Track space is from the tapered portion being continuously reduced.For representativeness, circular orbit 10R, 10L of left and right
It is considered following composition: along with advancing towards releasing D side, region from MD stretch zones B side, rail
Till road spacing reduces the width after the contraction corresponding to above-mentioned duplexer at leisure.In releasing
In the D of region, circular orbit 10R, 10L of left and right is considered track space from certain line part,
For representativeness, constitute in the following manner: with the rail of the width after the contraction of corresponding above-mentioned duplexer
Road spacing is generally parallel to each other.
Fixture (fixture in left side) 20 and the circular orbit 10R on right side on the circular orbit 10L in left side
On fixture (fixture on right side) 20 can the most touring movement.Such as, the circular orbit in left side
Driving sprocket wheel 30a, 30b of 10L are rotated in the counterclockwise direction by electro-motor 40a, 40b
Drive, the driving of the circular orbit 10R on right side with sprocket wheel 30a, 30b by electro-motor 40a,
40b and be rotated in a clockwise direction driving.Its result is, to be sticked in these drivings sprocket wheel 30a,
The fixture of the driving rolls (non-icon) of 30b holds component (not shown) and provides power of dividing a word with a hyphen at the end of a line.Thereby, left
The most touring movement of fixture 20 of side, the most touring shifting of fixture 20 on right side
Dynamic.The electro-motor of electro-motor and right side by making left side separately drives, and can make left side
Fixture 20 and the most touring movement of fixture 20 on right side.
Grip size is preferably 12mm～40mm, more preferably 15mm～35mm.In fixture
When size does not reaches the situation of 12mm, exist and tensile stress cannot be kept to rupture, or due to folder
The intensity of tool conveying unit is not enough and produces and drives abnormal situation.If grip size is more than 40mm,
Then it is present in region non-stretched near fixture to become big and produce the inequality of end, or owing to grabbing non-
The situation holding portion's local elongation and rupture in the generation of the surface of resin molding.Furthermore, so-called grip size,
Mean the width of grip areas.
And then, the fixture 20 in left side and the fixture 20 on right side are respectively variable spacing type.That is, left and right
Fixture 20,20 independently, and along with movement, the grip separation (folder of conveyance direction (MD)
Tool spacing) alterable.The fixture of variable spacing type can pass through Japanese Patent Laid-Open 2008-23775 public affairs
Composition that composition described in report etc. are the most suitable and realize.
Fig. 2 and Fig. 3 is respectively the major part approximate vertical view of the stretching device of Fig. 1.Fig. 2 is figure
In the stretching device of 1, from the rail of the part that MD stretch zones B divides a word with a hyphen at the end of a line to TD constriction zone C
The approximate vertical view in road.Fig. 3 is in the stretching device of Fig. 1, from TD constriction zone C to releasing district
The approximate vertical view of the track of the part that territory D divides a word with a hyphen at the end of a line.As shown in Figures 2 and 3, tapered portion
Two ends are considered separately as the bending section 11,12 bent with special angle (θ 1), thereby, and can be with interorbital
Connect apart from certain line part.Shrinkage factor and productivity ratio that angle of bend is visually required and suitably set
Fixed.Angle of bend θ 1 can be such as 1 °～20 °.
In use stretching device as illustrated in Figure 1 situation time, contraction-stretching process can include as
Lower operation: grasped edge, the both sides (grasping of duplexer by fixture with grip separation L1 of conveyance direction
Operation)；Make duplexer by line part while the grip separation of conveyance direction being extended to from L1
L2, thus stretch (MD stretching process) in length direction；Duplexer is made to pass through tapered portion thus in width
(TD contraction process) is shunk in degree direction.Also can optionally and then include following operation: stacking will be grasped
The fixture of body releases (releasing operation).Fig. 4 and Fig. 5 be respectively represent comprise the contraction of these operations-
The skeleton diagram of one example of stretching process.Hereinafter, with reference to these figures, while to shrinking-stretching work
Each operation in sequence illustrates in more detail.
First, in grasping operation (grip areas A), by the fixture 20 of left and right, grab with certain
Hold the edge, both sides that interval (grip separation) grasping is loaded to the duplexer 50 of stretching device, pass through
The movement of each fixture 20 guided by the circular orbit of left and right, and by this duplexer 50 to MD
Stretch zones B transports.Grasping about the edge, both sides in grip areas A is spaced (grip separation),
For representativeness, it is considered the most equal interval.Furthermore, so-called grip separation, for adjacent folder
Distance in the heart in Ju.
Then, in MD stretching process (MD stretch zones B), transport by the fixture of left and right
The duplexer 50 of 20 graspings, stretches (MD stretching) in length direction.The MD of duplexer 50
Stretch through following operation to carry out: increase the fixture 20 translational speed to conveyance direction at leisure, from
And the grip separation of conveyance direction is extended to L2 from L1.By adjusting MD stretch zones B's
Grip separation (the grasping interval in grasping operation) L1 Yu the MD drawing zone of the conveyance direction of porch
Grip separation L2 of the conveyance direction in the exit of territory B, can control stretching ratio (L2/L1).
Stretching ratio (L2/L1) in MD stretching process for example, 1.1 times～6.0 times, preferably 1.1
Times～5.5 times, more preferably 1.8 times～3.0 times.If stretching ratio does not reaches 1.1 times, then exist not
The situation of the optical characteristics needed for acquisition.On the other hand, if stretching ratio is more than 6.0 times, then exist
The situation of duplexer fracture.
Herein, if grip separation L1 is excessive, then speculate not grasped by fixture 20 in duplexer 50
Part produce as in width shrink stress, its result is, the optics of the polarizing coating obtained
Characteristic (such as, polarization characteristic) produces inequality.Accordingly, as one of inventive feature, between fixture
It is set as every L1 suppressing below the interval of the generation of above-mentioned inequality.
Specifically, grip separation L1 is below 60mm, preferably below 50mm, more excellent
Elect below 40mm as.By L1 is set to below 60mm, uneven generation can be suppressed, its
Result is, can make to be processed by slit and the cut-off width removed diminishes.Lower limit as L1
Want after stretching, to reach following grip separation L2, then without system limit, such as, can be more than 25mm.
On the other hand, if below being as above set to grip separation L1 to be specifically spaced, then existing
Following situation: according to the difference of stretching ratio, grip separation L2 after MD stretching also can diminish,
Produce the interference such as fixture 20 contacts with each other in tapered portion (especially bending section), and cannot reach required
Shrinkage factor (as result, it is impossible to the optical characteristics needed for acquisition).Therefore, grip separation L2 sets
For duplexer 50 by fixture during TD constriction zone C (the especially bending section) that be considered tapered portion
More than 20 intervals not interfered with each other.By being set to above-mentioned L2, L1 will not be restricted in bending
Interval that portion's fixture does not interferes with each other and can diminish.Furthermore, so-called " fixture does not interferes with each other ",
Mean fixture and hold component or interval guiding mechanism will not contact with each other, fixture can as set as in
Bending section moves.
The visual angle of bend of grip separation L2, the size of fixture, shape etc. and suitably set.Folder
Tool interval L2 is preferably 25mm～130mm, more preferably 35mm～50mm.If between fixture
In L2 is above-mentioned scope, then in TD contraction process, tapered portion (especially bending section) can be avoided
In fixture 20 interference each other and realize sufficient angle of bend, and receipts evenly can be realized
Contracting.Furthermore, it is curved greatly and lentamente by making the bending radius (R) in bending section become, even if
Grip separation diminishes, and also can avoid fixture interference each other.But, when this situation, exist as follows
Problem: must be around big curved the track that formed, thus equipment enlarging.It is directed to this, in the present invention,
Carry out, so the fixture of above-mentioned preferred scope can compatibly be taken into account after MD stretches owing to TD shrinks
Interval L1 and L2, its result is, not only can suppress uneven generation, also can avoid the said equipment
Maximization problem.
The formation material of the draft temperature visual thermoplastic resin base material of duplexer etc. and be set as arbitrarily
Suitable value.Draft temperature is for representativeness, for the glass transition temperature of thermoplastic resin base material
More than degree (Tg), the preferably glass transition temperature (Tg) of thermoplastic resin base material more than+10 DEG C,
And then preferably more than Tg+15 DEG C.On the other hand, the draft temperature of duplexer is preferably 170 DEG C
Below.By stretching under said temperature, the crystallization of PVA system resin can be suppressed to enter rapidly
Exhibition, thus the exception that suppression is caused by this crystallization (such as, hinders the PVA system carried out by stretching
The orientation of resin bed).
Then, in TD contraction process (TD constriction zone C), by by the fixture 20 of left and right
The duplexer 50 of grasping transports in length direction, and in width, duplexer 50 is shunk (TD
Shrink).In TD constriction zone C, circular orbit 10R, 10L of left and right are considered interorbital
The tapered portion that distance is continuously reduced, therefore by by this region, carries out duplexer 50 to width side
To contraction.TD shrinkage factor can by adjust track space from variable quantity and be controlled.Specifically
For, more make the track space at outlet (releasing region D side end) place of TD constriction zone C from phase
For TD constriction zone C entrance (MD stretch zones B side end) place track space from ratio
Diminish, more can obtain bigger shrinkage factor.
((width of the duplexer of the porch of TD constriction zone C: W1)-(TD receives TD shrinkage factor
The width of the duplexer in the exit of contracting region C: W2))/(layer of the porch of TD constriction zone C
The width of stack: W1) × 100) may be set to the most suitable value.TD shrinkage factor is preferably more than
15%, and then preferably more than 20% and do not reach 50%.By being set to above-mentioned shrinkage factor, can obtain more
Excellent optical characteristics.
In the embodiment illustrated in Fig. 4, in TD contraction process, only carry out duplexer 50
To the contraction of width.When this situation, in the state of the grip separation (L2) maintaining conveyance direction
Under, make duplexer 50 by TD constriction zone C.On the other hand, in the enforcement illustrated in Fig. 5
In mode, in TD contraction process, carry out duplexer 50 to the contraction of width and to length
The stretching in direction.When this situation, the grip separation of conveyance direction is extended to L3 from L2,
While making duplexer 50 by TD constriction zone C.In MD stretching process and TD contraction process
In, can be by making final stretching ratio uprise so that the multistage carries out MD stretching.It addition, pass through
Carry out TD to shrink and MD stretching simultaneously, following effect can be obtained: flexure or the product of gauffer can be suppressed
Raw.
About the stretching ratio of the duplexer after TD contraction process (for the stretching in MD stretching process
The product of the stretching ratio in multiplying power and TD contraction process, the most final stretching ratio.TD receives
Contracting operation comprise MD stretching situation time final stretching ratio be L3/L1, TD contraction process not
Final stretching ratio when comprising the situation of MD stretching is L2/L1), relative to the script of duplexer
Length, for example, more than 3.0 times, preferably more than 4.0 times.By entering with above-mentioned higher multiplying power
Row stretching, can obtain the polarizing coating of the optical characteristics with excellence.
Temperature environment in TD contraction process can be identical with the draft temperature in MD stretching process.
Finally, in releasing in operation (releasing region D), the fixture 20 of grasping duplexer 50 is released.
In releasing in operation, for representativeness, it is believed that spacing jig from and grip separation the most certain.Depending on needing
Want, after duplexer 50 is cooled to required temperature, release fixture.
A-3. other operations
The manufacture method of the polarizing coating of the present invention than that described above, can comprise other operations.As other
Operation, include, for example: insoluble operation, dyeing process, cross-linking process step are different from above-mentioned stretching
Stretching process, clean operation, be dried (regulation of moisture content) operation etc..Other operations can be in arbitrarily
Suitable time point carry out.
Above-mentioned dyeing process is for representativeness, for utilizing dichroic substance to enter PVA resin
The operation of row dyeing.Carry out preferably by making PVA resin absorption dichroic substance.Make
For this adsorption method, include, for example: make PVA resin (duplexer) impregnated in and comprise two colors
The method of the dyeing liquor of property material；The method that dyeing liquor is coated PVA resin；To PVA
The method etc. of resin spray dyeing liquid.Preferably make duplexer impregnated in and comprise dichroic substance
Method in dyeing liquor.Its reason is: can adsorb dichroic substance well.Furthermore, layer can be made
Stack two sides impregnated in dyeing liquor, also can only make duplexer single-side impregnated in dyeing liquor.
As above-mentioned dichroic substance, include, for example: iodine, organic dyestuff.They can be used alone,
Or it is used in combination of two or more.Dichroic substance is preferably iodine.In using iodine as dichroic substance
Situation time, above-mentioned dyeing liquor is preferably iodine aqueous solution.About the use level of iodine, relative to water 100
Weight portion, preferably 0.1 weight portion～1.0 weight portions.In order to improve the iodine dissolubility to water, excellent
Elect cooperation iodide salt in iodine aqueous solution as.As iodide salt, include, for example: potassium iodide,
Lithium iodide, sodium iodide, zinc iodide, silver iodide, lead iodide, Copper diiodide, barium iodide, calcium iodide,
Tin tetraiodide., titanium iodide etc..Wherein, preferably potassium iodide, sodium iodide.Cooperation about iodide salt
Amount, relative to water 100 weight portion, preferably 0.3 weight portion～15 weight portions.
The liquid temperature during dyeing of dyeing liquor is preferably 20 DEG C～40 DEG C.Impregnate in making PVA resin
During situation in dyeing liquor, dip time is preferably 5 seconds～300 seconds.If above-mentioned condition, then
PVA resin can be made fully to adsorb dichroic substance.
About above-mentioned insoluble operation and cross-linking process step, for representativeness, by making PVA system tree
Lipid layer impregnated in boric acid aqueous solution and carries out.About above-mentioned clean operation, for representativeness, logical
Cross and make PVA resin impregnated in potassium iodide aqueous solution to carry out.Doing in above-mentioned drying process
Dry temperature is preferably 30 DEG C～100 DEG C.
B. polarizing coating
The polarizing coating made by above-mentioned manufacture method is essentially gas absorption quantity dichroic substance
PVA resin film.Polarizing coating preferably shows with the arbitrary wavelength in wavelength 380nm～780nm
Show absorption dichromatic.
The using method of polarizing coating can use the most suitable method.Specifically, can be with above-mentioned
The state that thermoplastic resin base material is integrally forming uses, and also can be transferred to other from thermoplastic resin base material
Component (thermoplastic resin base material is peeled off) and use.
C. optical laminate
The optical laminate of the present invention has: the light manufactured by the manufacture method described in A item
Learn film (such as, polarizing coating) and be arranged at the base material of at least side of this blooming.Base material can be via
Adhesive layer and be arranged at the side of blooming, also can directly be laminated in optics not via adhesive layer
Film.
Optical laminate when the situation that blooming is polarizing coating has: above-mentioned polarizing coating and configuration
In at least side of polarizing coating and can the base material of supporting polarization film.As this base material, can be used directly
State thermoplastic resin base material, also can use the optically functional film different from above-mentioned thermoplastic resin base material.
As the formation material of optically functional film, such as, can use the material identical with above-mentioned thermoplastic resin.
In addition to them, the most also can use (methyl) acrylic resin, diacetyl cellulose, triacetyl
The cellulose-based resin such as cellulose etc..
Optically functional film is arranged at the side of polarizing coating preferably via adhesive layer.By arranging optics
Functional membrane, can suppress curling.The thickness of optically functional film is preferably 20 μm～100 μm.In use
During the situation of optically functional film, it is preferably and will be arranged at the thermoplastic resin-based of the side of polarizing coating in advance
Material is peeled off.Its reason is: can suppress curling more reliably.Adhesive layer is by the most suitable glue
Stick is formed.As adhesive, include, for example: polyethenol series adhesive.
The shrinkage stress of the optical laminate (polarizing coating) of the present invention is less, is i.e. easy under hot environment,
Dimensional stability is the most excellent.It addition, monomer absorbance is degree of polarization when 41% be preferably 99.9% with
On.As above optical characteristics can be made excellent.
[embodiment]
Hereinafter, by embodiment, the present invention is specifically illustrated, but the present invention is not by these
Embodiment limits.
[embodiment 1]
<duplexer manufacturing process>
Preparation amorphism PET base material (100 μ m-thick) is as thermoplastic resin base material, in this amorphism
PET base material coating PVA aqueous solution, is dried at a temperature of 50 DEG C～60 DEG C.Thereby, in
In amorphism PET base material, the PVA layer of 14 μ m-thick is filmed, and making layer stack.
<contraction-stretching process>
Use stretching device as shown in Figure 1, the duplexer obtained is carried out MD stretching and TD
Shrink.Specifically, in grip areas A, grasp duplexer with grip separation L1:35mm
Edge, both sides and in length direction transport, in MD stretch zones B, to length at 140 DEG C
Degree direction be stretched in the air 1.43 times (grip separation L2 in the exit of MD stretch zones B:
50mm).Then, in TD constriction zone C, while shrinking 25% at width,
(grip separation L3:105 in the exit of TD constriction zone C is stretched in the air to length direction
Mm, final stretching ratio: 3 times, the width of duplexer: 650mm).Thereafter, in releasing region
In D, release the fixture of grasping duplexer.Furthermore, the angle of bend of bending section is about 7 °, but in
Bending section does not occurs the contact of fixture.
<dyeing process>
Then, the iodine aqueous solution (iodine concentration: 0.5 weight %, potassium iodide that duplexer impregnated in 25 DEG C is made
Concentration: 10 weight %) in 30 seconds.
<crosslinking Treatment>
Make boric acid aqueous solution that the duplexer after dyeing impregnated in 60 DEG C (boric acid concentration: 5 weight %,
Potassium iodide concentration: 5 weight %) in 60 seconds, draw in this boric acid aqueous solution and then to length direction
Stretch 1.8 times.
<clean and process>
After crosslinking Treatment, make potassium iodide aqueous solution (the potassium iodide concentration: 5 that duplexer impregnated in 25 DEG C
Weight %) in 5 seconds.
In the above described manner, on thermoplastic resin base material, make the polarizing coating of thickness 4.0 μm.
[embodiment 2]
Carry out shrinking-stretching process in the following manner, in addition, with side same as in Example 1
Formula is carried out, thus makes the polarizing coating of thickness 4.0 μm on thermoplastic resin base material.
<contraction-stretching process>
In grip areas A, grasp the edge, both sides of duplexer also with grip separation L1:60mm
Transport in length direction, in MD stretch zones B, at 140 DEG C, carry out sky to length direction
In be stretched to 1.66 times (grip separation L2:100mm in the exit of MD stretch zones B).So
After, in TD constriction zone C, while shrinking 25% at width, to length direction
Stretch that (grip separation L3:180mm in the exit of TD constriction zone C, finally draws in the air
Stretch multiplying power: 3 times, the width of duplexer: 700mm).Thereafter, in releasing in the D of region, release
The fixture of grasping duplexer.Furthermore, the angle of bend of bending section is about 7 °, but in bending section not
There is the contact of fixture.
[comparative example 1]
Carry out shrinking-stretching process in the following manner, in addition, with side same as in Example 1
Formula is carried out, thus makes the polarizing coating of thickness 4.0 μm on thermoplastic resin base material.
<contraction-stretching process>
In grip areas A, with the edge, both sides of grip separation L1:100mm grasping duplexer
And transport in length direction, in MD stretch zones B, carry out to length direction at 140 DEG C
It is stretched to 1.2 times (grip separation L2:120mm in the exit of MD stretch zones B) in the air.
Then, in TD constriction zone C, while shrinking 25% at width, to length side
To stretching in the air (grip separation L3:300mm in the exit of TD constriction zone C, finally
Stretching ratio: 3 times, the width of duplexer: 680mm).Thereafter, in releasing in the D of region, solve
Fixture except grasping duplexer.Furthermore, the angle of bend of bending section is about 7 °, but in bending section
There is not the contact of fixture.
[comparative example 2]
Carry out shrinking-stretching process in the following manner, in addition, with side same as in Example 1
Formula is carried out, thus makes the polarizing coating of thickness 4.0 μm on thermoplastic resin base material.
<contraction-stretching process>
In grip areas A, with the edge, both sides of grip separation L1:120mm grasping duplexer
And transport in length direction, in MD stretch zones B, carry out to length direction at 140 DEG C
It is stretched to 1.25 times (grip separation L2:150mm in the exit of MD stretch zones B) in the air.
Then, in TD constriction zone C, while shrinking 25% at width, to length side
To stretching in the air (grip separation L3:360mm in the exit of TD constriction zone C, finally
Stretching ratio: 3 times, the width of duplexer: 650mm).Thereafter, in releasing in the D of region, solve
Fixture except grasping duplexer.Furthermore, the angle of bend of bending section is about 7 °, but in bending section
There is not the contact of fixture.
(that is, before treatment for dyeing about the stretched film obtained in above-described embodiment and comparative example
Film), the width in the uneven region (following, also known as " unstable region ") of optical characteristics will be produced
It is shown in Fig. 6 with the relation of L1.Furthermore, the width of unstable region is obtained in the following manner.That is,
The thickness distribution of width is measured, the thickness distribution of central part will be comprised in 3 μm
Region is set to stability region, and the region beyond it is set to unstable region.
As shown in Figure 6, it is known that the grip separation of initial conveyance direction is set to below 60mm and
Carrying out the stretching to length direction, then, carrying out the contraction to width, even if the most finally drawing
Stretch multiplying power identical, the homogeneity of optical characteristics also be improved significantly, its result is, unstable region
Width significantly reduce.
[industrial applicability]
The manufacture method of the present invention can be preferably used as the system of the blooming such as polarizing coating, optical compensation films
Make.
Symbol description
10 tracks
20 fixtures
50 duplexers (resin molding)
100 stretching devices
Claims (5)
1. a manufacture method for blooming, transports in length direction including the resin molding making long shape
While stretching in this length direction, the operation then shunk in width i.e. stretches-contraction process,
This stretching-contraction process includes: use the grasping mechanism possessing the resin molding as this long shape many
The tentering stretching device of individual fixture, grasps the resin molding of this long shape with grip separation L1 of conveyance direction
Edge, both sides, this grip separation is extended to L2 from L1, thus by the resin molding of this long shape in length
The stretching of degree direction, then, reduces the grip separation of width, thus make the resin molding of this long shape in
Width shrinks,
This grip separation L1 is below 60mm,
Between when this grip separation L2 is the grip separation reducing width, fixture does not interferes with each other
Every.
2. the manufacture method of blooming as claimed in claim 1, wherein,
Described resin molding is 1.1 times～6.0 times to the stretching ratio of length direction i.e. L2/L1.
3. the manufacture method of blooming as claimed in claim 1, wherein,
In described stretching-contraction process, in making described tree by reducing the grip separation of width
The period that adipose membrane shrinks in width, by being extended to L3 by the grip separation of conveyance direction from L2
And described resin molding is stretched in length direction.
4. the manufacture method of blooming as claimed in claim 1, wherein,
Described blooming is polarizing coating.
5. an optical laminate, it has:
Blooming, is manufactured by the manufacture method of the blooming of claim 1；And
Base material, is arranged at least side of this blooming.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-004732 | 2015-01-14 | ||
| JP2015004732A JP6494291B2 (en) | 2015-01-14 | 2015-01-14 | Manufacturing method of optical film |
| PCT/JP2015/082876 WO2016114005A1 (en) | 2015-01-14 | 2015-11-24 | Optical film manufacturing method |
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| CN105980132A true CN105980132A (en) | 2016-09-28 |
| CN105980132B CN105980132B (en) | 2019-10-25 |
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| Country | Link |
|---|---|
| JP (1) | JP6494291B2 (en) |
| KR (1) | KR102322179B1 (en) |
| CN (1) | CN105980132B (en) |
| TW (1) | TW201630706A (en) |
| WO (1) | WO2016114005A1 (en) |
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|---|---|---|---|---|
| CN113727826A (en) * | 2019-04-18 | 2021-11-30 | 株式会社日本制钢所 | Stretching device and method for replacing parts of stretching device |
| CN115122616A (en) * | 2021-03-24 | 2022-09-30 | 日东电工株式会社 | Method for producing stretched film |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2019053169A (en) | 2017-09-14 | 2019-04-04 | 日東電工株式会社 | Polarizer, manufacturing method of polarizer and optical laminate including the polarizer |
| US20220105672A1 (en) * | 2020-10-05 | 2022-04-07 | Facebook Technologies, Llc | Apparatus and method for manufacturing optically anisotropic polymer thin films |
| US11597198B2 (en) | 2020-10-05 | 2023-03-07 | Meta Platforms Technologies, Llc | Methods of manufacturing optically anisotropic polymer thin films |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN105980132B (en) | 2019-10-25 |
| JP6494291B2 (en) | 2019-04-03 |
| TW201630706A (en) | 2016-09-01 |
| KR20170102795A (en) | 2017-09-12 |
| JP2016129961A (en) | 2016-07-21 |
| KR102322179B1 (en) | 2021-11-04 |
| WO2016114005A1 (en) | 2016-07-21 |
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