CN112698521A - Stretching device for polarizing film and method for manufacturing polarizing film - Google Patents
Stretching device for polarizing film and method for manufacturing polarizing film Download PDFInfo
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- CN112698521A CN112698521A CN202110104806.5A CN202110104806A CN112698521A CN 112698521 A CN112698521 A CN 112698521A CN 202110104806 A CN202110104806 A CN 202110104806A CN 112698521 A CN112698521 A CN 112698521A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000004043 dyeing Methods 0.000 claims abstract description 38
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- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 40
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 40
- 239000012528 membrane Substances 0.000 claims description 31
- 239000011347 resin Substances 0.000 claims description 12
- 229920005989 resin Polymers 0.000 claims description 12
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- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
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- DKNPRRRKHAEUMW-UHFFFAOYSA-N Iodine aqueous Chemical compound [K+].I[I-]I DKNPRRRKHAEUMW-UHFFFAOYSA-N 0.000 description 1
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- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
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Abstract
The invention provides a stretching device of a polarizing film and a manufacturing method of the polarizing film, the stretching device of the polarizing film comprises a solution tank, a driving part, a conveying part and a plurality of clamps, the solution tank is used for containing solution, the driving part is used for driving the conveying part so that the conveying part conveys the polarizing film along the direction vertical to the stretching direction of the polarizing film, the conveying part comprises a first conveying part and a second conveying part, at least part of the distance between the first conveying part and the second conveying part is gradually widened along the advancing path direction of the polarizing film, in the stretching process of the polarizing film, the driving part, the conveying part and the fixing part of the clamps are all positioned above the liquid level of the solution in the solution tank, the stretching device realizes the transverse stretching of the polarizing film in the solution, the stretching uniformity of the polarizing film is good, in the manufacturing method of the polarizing film, the polarizing film is transversely stretched in the solution after being dyed, the polarizing film has good dyeing effect, and high transmittance and polarization degree.
Description
Technical Field
The invention belongs to the technical field of polarizing film manufacturing, and particularly relates to a stretching device of a polarizing film and a manufacturing method of the polarizing film.
Background
The polaroids are all called as polaroids, the imaging of the liquid crystal display is dependent on polarized light, and all liquid crystal screens are provided with front and rear polaroids which are tightly attached to liquid crystal glass to form the liquid crystal display with the total thickness of about 1 mm. The basic structure of the polarizer includes: polyvinyl alcohol (PVA) in the middle, two layers of cellulose Triacetate (TAC), pressure sensitive adhesive (PSA film), Release film (Release film) and Protective film (Protective film). Wherein, what plays the polarization is PVA layer, in the production process of polaroid, need stretch PVA. Existing PVA stretching includes longitudinal stretching and transverse stretching.
The longitudinal stretching of the PVA is performed by stretching the PVA in the winding direction. The existing longitudinal stretching can cause necking problem, the width direction of the film can be narrowed by about half, the final effective width obtained by the width of the PVA film of about 3 m is about 1.5 m, and the width of the original PVA film is required to be about 6 m to obtain the polaroid of 2.5 m. It can be seen that the PVA obtained by the existing longitudinal stretching becomes narrow, the utilization rate becomes low, and the width of the original PVA film is very large and is not beneficial to transportation when the existing longitudinal stretching technology is used for manufacturing ultra-wide width.
The transverse PVA stretching device in the prior art cannot be realized in solution, the transverse stretching can only adopt high-temperature dry stretching, however, the high-temperature dry stretching of PVA can only adopt a manufacturing method of firstly stretching and then dyeing, and the following problems can be caused in the process of firstly stretching and then dyeing: firstly, stretching and dyeing are carried out firstly, the stretched film still generates certain retraction in the dyeing process, and the winding tension resists the retraction force, so that the generated longitudinal tension can longitudinally extend the PVA film, and the transmittance of the PVA can be reduced; secondly, dyeing the extended PVA film, and adsorbing iodine molecules after the PVA film swells in a solution, so that the orientation of PVA molecular chains is damaged, and the polarization degree of the PVA film is also reduced; thirdly, since the dyeing time is not too long, the dyeing depth is low, the dyeing efficiency is not high, and the durability of the polarizer is not stable; fourthly, the PVA film is hard when high-temperature dry-method stretching is carried out in gas, the PVA film is easy to break, the high-temperature dry-method stretching needs to be filled with inert gas and needs to be heated, the production convenience is poor, whether crystallization and orientation are uniform or not in the stretching process, whether the crystal region proportion is proper or not, one of the keys lies in the uniformity and stability of the temperature, the dry-method stretching adopts hot air heating, the hot air heating is nonuniform, the orientation is nonuniform, the uniformity of the PVA film in the stretching process is limited, the stretching multiplying power is low, the dyeing depth is low after stretching, the dyeing efficiency is not high, the composite tension, the uniformity of color tone and the durability of the formed original polarizer film are not easy to stabilize, and the surface of the original polarizer film is rough.
Disclosure of Invention
The embodiment of the invention aims to provide a stretching device for a polarizing film, which is used for solving the technical problems that the polarizing film needs a wider film width for longitudinal extension and cannot be stretched transversely by a wet method in the prior art.
The embodiment of the invention aims to provide a method for manufacturing a polarizing film, which aims to solve the technical problem of poor quality of an original film of a polarizing film in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the invention provides a stretching device of a polarizing film sheet, which comprises a solution tank, a driving piece, a conveying piece and a plurality of clamps;
the solution tank is used for containing a solution, the driving part is used for driving the conveying part to enable the conveying part to convey the polarizing film along the direction perpendicular to the stretching direction of the polarizing film, the conveying part comprises a first conveying part and a second conveying part, and the distance between at least part of the first conveying part and the second conveying part is gradually widened along the traveling path direction of the polarizer;
the fixing part is installed on the first conveying part and the second conveying part at a preset interval, and the clamping part is used for clamping the polarizing membrane so that the polarizing membrane is stretched in the solution.
In one embodiment, a first guide roller and a second guide roller are provided along a first end of the direction of the travel path of the conveyor, a third guide roller and a fourth guide roller are provided along a second end of the direction of the travel path of the conveyor, the first guide roller and the fourth guide roller are located outside the solution tank, and the second guide roller and the third guide roller are located inside the solution tank.
In one embodiment, the clamp is a motorized clamp.
In one embodiment, the first and second conveying members are both endless chains; the fixture further comprises a frame, the fixing portion comprises a chain clamp, a first end of the chain clamp is fixed on the annular chain, a second end of the chain clamp is fixed on the frame, the clamping portion is of a shifting lever structure, and the shifting lever structure is movably connected with the frame.
In one embodiment, the device further comprises a housing, the housing is located above the liquid level of the solution, the driving member, the first conveying member, the second conveying member and the fixing portion of the clamp are all located in the housing, the clamping portion is located outside the housing, and the bottom of the housing is provided with an opening allowing the frame of the clamp to pass through.
In one embodiment, the travel path of the endless chain is not in a horizontal plane.
In one embodiment, the device further comprises a track, wherein the endless chains are arranged on the track, a first parallel section, an expansion section and a second parallel section which are connected in sequence are formed between the two endless chains along the direction of the travel path, and the distance between the two chains on the first parallel section is smaller than the distance between the two chains on the second parallel section.
A second aspect of the present invention provides a method for manufacturing a polarizing film, including:
a dyeing procedure: dyeing a single-layer polyvinyl alcohol resin film having a thickness of 3 μm or more or a laminated film obtained by laminating the single-layer polyvinyl alcohol resin film with a base film with a dichroic dye to obtain a dyed film;
a stretching process: clamping the dyed film by a clamp in a solution to perform transverse stretching along the width direction of the dyed film;
the clamp comprises a clamping part and a fixing part, wherein the clamping part of the clamp is used for clamping the dyed membrane so that the dyed membrane is stretched in the solution, and the fixing part is positioned above the liquid level of the solution in the stretching process of the dyed membrane.
In one embodiment, the transverse stretching magnification in the stretching step is 4 or more.
The stretching device of the polarizing film provided by the invention comprises a solution tank, a driving part, a conveying part and a plurality of clamps, wherein the solution tank is used for accommodating solution, the driving part is used for driving the conveying part to enable the conveying part to convey the polarizing film along the direction vertical to the stretching direction of the polarizing film, the conveying part comprises a first conveying part and a second conveying part, the distance between at least part of the first conveying part and the second conveying part is gradually widened along the advancing path direction of the polarizing film, the stretching device realizes transverse stretching of the polarizing film, the necking problem of longitudinal stretching is avoided, and the utilization rate of the polarizing film is high; anchor clamps include clamping part and fixed part, the fixed part of anchor clamps is installed on first conveying and second conveying with predetermineeing the interval, the clamping part centre gripping polarizing membrane of anchor clamps is so that polarizing membrane realizes tensile in solution, this stretching device has realized the tensile of polarizing film piece in solution, and the tensile in-process of polaroid, only the clamping part is in solution, the driving piece, conveying and anchor clamps fixed part are located the liquid level in solution groove, stretching device's driving piece has been avoided, the fixed part of conveying and anchor clamps is soaked and is led to the fact the pollution to solution in the solution, polarizing film piece's quality has been improved.
The manufacturing method of the polarizing film provided by the invention comprises the following steps: a dyeing step of dyeing a single-layer polyvinyl alcohol resin film having a thickness of 3 μm or more or a laminated film obtained by laminating the single-layer polyvinyl alcohol resin film and a base film with a dichroic dye to obtain a dyed film; a stretching step of holding the dyed film with a jig in a solution to stretch the dyed film in the width direction of the dyed film; the clamp comprises a clamping part and a fixing part, wherein the clamping part of the clamp is used for clamping the dyeing membrane so that the dyeing membrane is stretched in the solution, and the fixing part is positioned above the liquid level of the solution in the stretching process of the dyeing membrane. The stretching process in the manufacturing method of the polarizing film adopts wet stretching, the stretching uniformity of the polarizing film is good, the polarizing film is dyed and then stretched in the manufacturing method of the polarizing film, the dyeing effect of the polarizing film is good, and the transmittance and the polarization degree of the polarizing film are high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a stretching apparatus for a polarizing film according to an embodiment of the present invention;
fig. 2 is a schematic partial structural diagram of a clamp and a housing of a stretching device for a polarizing film according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for manufacturing a polarizing film according to an embodiment of the invention.
Wherein, in the figures, the respective reference numerals:
1-a solution tank;
2-a conveying member;
3, clamping;
4-a polarizing film;
5-a first guide roller;
6-a second guide roller;
7-a third guide roller;
8-a fourth guide roller;
9-a housing;
21-a first transfer member;
22-a second transfer member;
31-a stationary part;
32-a clamping portion;
33-framework.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The stretching apparatus for a polarizing film sheet and the method for producing a polarizing film sheet according to the present invention will be described in detail with reference to specific examples.
Fig. 1 is a schematic structural diagram of a stretching device for a polarizing film according to an embodiment of the present invention, and fig. 2 is a schematic partial structural diagram of a clamp and a housing of the stretching device for a polarizing film according to an embodiment of the present invention, and referring to fig. 1 and fig. 2, a first aspect of an embodiment of the present invention provides a stretching device for a polarizing film, including a solution tank 1, a driving member (not shown), a conveying member 2, and a plurality of clamps 3;
the solution tank 1 is used for containing a solution, the driving part is used for driving the conveying part 2 to enable the conveying part 2 to convey the polarizing film 4 along the direction perpendicular to the stretching direction of the polarizing film 4, the conveying part 2 comprises a first conveying part 21 and a second conveying part 22, and the distance between at least part of the first conveying part 21 and the second conveying part 22 is gradually widened along the traveling path direction of the polarizing film 4;
the fixture 3 comprises a fixing part 31 and a clamping part 32 connected with the fixing part 31, the fixing part 31 is installed on the first conveying part 21 and the second conveying part 22 at a preset interval, the clamping part 32 is used for clamping the polarizing membrane 4, so that the polarizing membrane 4 is stretched in the solution, wherein in the stretching process of the polarizing membrane 4, the driving part, the conveying part 2 and the fixing part 31 of the fixture 3 are all located above the liquid level of the solution in the solution tank 1.
The polarizing film sheet in this embodiment refers to a laminated film in which polyvinyl alcohol or polyvinyl alcohol is laminated with a base film.
The polarizing film sheet of this embodiment adopts wet process to stretch, and the polarizing film piece is stretched in the solution of solution tank, and the polarizing film sheet atress is even, and the solution of this embodiment is: iodine, potassium iodide and boric acid or one or two of the substances.
The conveying member 2 of this embodiment is used for conveying the polarizing film 4 in a direction perpendicular to a stretching direction of the polarizing film, the conveying member 2 includes a first conveying member 21 and a second conveying member 22, a distance between at least a portion of the first conveying member 21 and the second conveying member 22 gradually widens along a traveling path direction of the polarizing film 4, a specific form of the first conveying member 21 and the second conveying member 22 is not particularly limited in this embodiment, for example, the first conveying member 21 and the second conveying member 22 may employ a transmission chain or a transmission belt, the driving member of this embodiment is used for driving the conveying member 2, a specific form of the driving member is not particularly limited in this embodiment, the polarizing film 4 of this embodiment employs transverse stretching, PVA is stretched in a direction perpendicular to a winding direction, and the stretched PVA does not cause a necking problem, and has a high PVA utilization rate.
The fixture 3 of the present embodiment is used for fixing a polarizing film sheet in a stretching process of the polarizing film sheet, the fixture 3 of the present embodiment includes a fixing portion 31 and a clamping portion 32, the fixing portion 31 is installed on the conveying member 2 at a preset interval, the clamping portion 32 is used for fixing the polarizing film sheet 4 so that the polarizing film sheet 4 is stretched in the solution, and the fixing portion 31 is located above the liquid level of the solution in the solution tank 1 in the stretching process of the polarizing film sheet 4. The stretching device of the embodiment prevents the solution from being contaminated by the transfer member 3 and the fixing portion 31 of the jig, because the transfer member 2 and the fixing portion 31 of the jig 3 are both positioned above the liquid level of the solution during the stretching of the polarizing film sheet 4.
The stretching device of the polarizing film provided by the invention comprises a solution tank, a driving part, a conveying part and a plurality of clamps, wherein the solution tank is used for accommodating solution, the driving part is used for driving the conveying part to enable the conveying part to convey the polarizing film along the direction vertical to the stretching direction of the polarizing film, the conveying part comprises a first conveying part and a second conveying part, the distance between at least part of the first conveying part and the second conveying part is gradually widened along the advancing path direction of the polarizing film, the stretching device realizes transverse stretching of the polarizing film, the necking problem of longitudinal stretching is avoided, and the utilization rate of the polarizing film is high; anchor clamps include clamping part and fixed part, the fixed part of anchor clamps is installed on first conveying piece and second conveying piece with predetermineeing the interval, the clamping part centre gripping polarizing membrane of anchor clamps is so that polarizing membrane realizes tensile in solution, this stretching device has realized the tensile of polarizing membrane piece in solution, and polarizing membrane piece stretching process, only the clamping part is in solution, the driving piece, conveying piece and anchor clamps fixed part are located the liquid level of solution tank, stretching device's driving piece has been avoided, the fixed part of conveying piece and anchor clamps is soaked and is led to the fact the pollution to solution in the solution, polarizing membrane piece's quality has been improved.
Preferably, the stretching device of this embodiment is provided with a first guide roller 5 and a second guide roller 6 along a first end of the direction of the traveling path of the conveyor 2, and is provided with a third guide roller 7 and a fourth guide roller 8 along a second end of the direction of the traveling path of the conveyor, wherein the first guide roller 5 and the fourth guide roller 8 are located outside the solution tank 1, and the second guide roller 6 and the third guide roller 7 are located inside the solution tank 1. The polarizing film roll which is not stretched in the stretching process of the polarizing film 4 is placed outside the solution tank 1, the first guide roller 5 is used for guiding the polarizing film roll 4 before the polarizing film roll is not stretched and blocking the polarizing film roll from sliding into the solution tank 1, the second guide roller 6 in the solution tank 1 enables the polarizing film roll 4 to be always positioned on the lower side of the second guide roller 6, the third guide roller 7 in the solution tank 1 has the same function as the second guide roller 6, and the fourth guide roller 8 is used for guiding the polarizing film roll 4 after the polarizing film roll is stretched and blocking the polarizing film roll after the polarizing film roll is stretched from sliding into the solution tank 1.
Preferably, the clamping portion 32 is an electric clamping portion. The holding portion 32 of the present embodiment is an electric holding portion, and the holding portion 32 automatically holds the polarizing film 4 after the polarizing film 4 enters the holding portion 32.
Preferably, the first conveying element 21 and the second conveying element 22 are both endless chains; the fixture 3 further comprises a frame 33, the fixing portion 31 is a chain clamp, a first end of the chain clamp is fixed on the annular chain, a second end of the chain clamp is fixed on the frame 33, the clamping portion 32 is a shifting lever structure, and the shifting lever structure is movably connected with the frame 33. The first conveying member 21 and the second conveying member 22 of the present embodiment are preferably endless chains, and the transmission structure is simple and easy to manufacture.
Further, the stretching device for the polarizing film sheet of the present embodiment further includes a housing 9, the housing 9 is located above the liquid level of the solution, the driving member, the first conveying member 21, the second conveying member 22 and the fixing portion 31 of the clamp 3 are all located inside the housing 9, the clamping portion 32 is located outside the housing 9, and the bottom of the housing 9 has an opening for allowing the frame of the clamp 3 to pass through. The driving part, the first conveying part 21, the second conveying part 22 and the fixing part 31 of the clamp 3 are all located inside the shell 9, lubricating oil added to the driving part, the first conveying part 21, the second conveying part 22 and the fixing part 31 and fragments generated by abrasion cannot enter the solution, pollution of the lubricating oil added to the driving part, the first conveying part and the second conveying part and the fragments generated by abrasion to the solution is avoided, pollution to the polarizing film sheet 4 is reduced to a certain extent, and forming quality of the polarizing film sheet 4 in the stretching process is improved.
In this embodiment, the running track of the endless chain is not in a horizontal plane. The running locus of the endless chain of the present embodiment is in a vertical plane. In other embodiments, the plane of the running track of the endless chain may form an angle with the horizontal plane, and this embodiment is not particularly limited.
Further, the conveying member of the stretching device for polarizing film sheets of the present embodiment further includes a guide rail, the endless chain is disposed on the guide rail, and the guide rail of the present embodiment is made of ultra-high molecular polyethylene, and plays a role in supporting and guiding the endless chain, thereby reducing friction of the chain, reducing noise, and prolonging the service life of the chain. And a first parallel section, an expansion section and a second parallel section which are sequentially connected are formed between the two annular chains along the direction of the travel path, and the distance between the two chains on the first parallel section is smaller than the distance between the two chains on the second parallel section. The first parallel section is a transition section of the polarizing film sheet 4 before stretching, the expanding section is a stretching section of the polarizing film sheet 4, and the second parallel section is a transition section of the polarizing film sheet 4 after stretching.
The stretching device for the polarizing film provided by the embodiment comprises a solution tank, a driving part, a conveying part and a plurality of clamps, wherein the solution tank is used for containing solution, the driving part is used for driving the conveying part to enable the conveying part to convey the polarizing film along the direction perpendicular to the stretching direction of the polarizing film, the conveying part comprises a first conveying part and a second conveying part, the distance between at least part of the first conveying part and the second conveying part is gradually widened along the advancing path direction of the polarizing film, the stretching device realizes transverse stretching of the polarizing film, the necking problem of longitudinal stretching is avoided, and the utilization rate of the polarizing film is high; anchor clamps include clamping part and fixed part, the fixed part of anchor clamps is installed on first conveying and second conveying with predetermineeing the interval, the clamping part centre gripping polarizing membrane of anchor clamps is so that polarizing membrane realizes tensile in solution, this stretching device has realized the tensile of polarizing film piece in solution, and the tensile in-process of polaroid, only the clamping part is in solution, the driving piece, conveying and anchor clamps fixed part are located the liquid level in solution groove, stretching device's driving piece has been avoided, the fixed part of conveying and anchor clamps is soaked and is led to the fact the pollution to solution in the solution, polarizing film piece's quality has been improved.
Fig. 3 is a flowchart of a method for manufacturing a polarizing film according to an embodiment of the present invention, and referring to fig. 3, a second aspect of the embodiment of the present invention provides a method for manufacturing a polarizing film, including:
s101, dyeing: dyeing a single-layer polyvinyl alcohol resin film having a thickness of 3 μm or more or a laminated film obtained by laminating the single-layer polyvinyl alcohol resin film with a base film with a dichroic dye to obtain a dyed film;
specifically, a single-layer polyvinyl alcohol resin film or a laminated film obtained by laminating the single-layer polyvinyl alcohol resin film and a base film is immersed in a dichroic dye solution (dyeing solution) and dyed. The substrate film layer in this embodiment may be: polyethylene or thicker polyvinyl alcohol films and the like having a better elongation at break. The dichroic pigment in this embodiment refers to a substance having different extinction coefficients for parallel polarized light and perpendicular polarized light, and typically includes a polyiodide solution formed by mixing and dissolving iodine and potassium iodide, a wakeup dye, an azo dye, a leek dye, and the like. The dyeing temperature and dyeing time in the dyeing process of this embodiment are prior art, and this embodiment is not described herein again.
S102, a stretching step: clamping the dyed film by a clamp in a solution to stretch along the width direction of the dyed film; the clamp comprises a clamping part and a fixing part, wherein the clamping part of the clamp is used for clamping the dyed membrane so that the dyed membrane is stretched in the solution, and the fixing part is positioned above the liquid level of the solution in the stretching process of the dyed membrane.
Specifically, the dyed film of this embodiment is stretched along the transverse direction of dyed film width direction in solution, has avoided the necking down problem of longitudinal stretching, and the utilization ratio of dyed film is high, and this drawing is carried out in solution, and dyed film extension homogeneity is good, can not destroy the dyeing effect for the transmittance and the polarization degree of the polarizing film piece of making are high. In the stretching method of the embodiment, the clamp comprises the clamping part and the fixing part, the clamping part of the clamp is used for clamping the dyeing film so that the dyeing film is stretched in the solution, wherein in the stretching process of the dyeing film, the fixing part is located above the liquid level of the solution, only the clamping part clamps the dyeing film in the solution, the fixing part of the clamp is not immersed in the solution, the pollution of the fixing part to the stretching solution is avoided, and the quality of the polarizing film is improved to a certain extent.
Preferably, the transverse stretching magnification in the stretching step is 4 or more times.
The manufacturing method of the polarizing film provided by the invention comprises the following steps: a dyeing step of dyeing a single-layer polyvinyl alcohol resin film having a thickness of 3 μm or more or a laminated film obtained by laminating the single-layer polyvinyl alcohol resin film and a base film with a dichroic dye to obtain a dyed film; a stretching step of holding the dyed film with a jig in a solution to stretch the dyed film in the width direction of the dyed film; the clamp comprises a clamping part and a fixing part, wherein the clamping part of the clamp is used for clamping the dyeing membrane so that the dyeing membrane is stretched in the solution, and the fixing part is positioned above the liquid level of the solution in the stretching process of the dyeing membrane. The stretching process in the manufacturing method of the polarizing film adopts wet stretching, the stretching uniformity of the polarizing film is good, the polarizing film is dyed and then stretched in the manufacturing method of the polarizing film, the dyeing effect of the polarizing film is good, and the transmittance and the polarization degree of the polarizing film are high.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A stretching device of a polarizing film sheet is characterized in that:
comprises a solution tank, a driving part, a conveying part and a plurality of clamps;
the solution tank is used for containing a solution, the driving part is used for driving the conveying part to enable the conveying part to convey the polarizing film along the direction perpendicular to the stretching direction of the polarizing film, the conveying part comprises a first conveying part and a second conveying part, and the distance between at least part of the first conveying part and the second conveying part is gradually widened along the traveling path direction of the polarizer;
the fixing part is installed on the first conveying part and the second conveying part at a preset interval, and the clamping part is used for clamping the polarizing membrane so that the polarizing membrane is stretched in the solution.
2. The stretching apparatus of a polarizing film sheet as claimed in claim 1, wherein: follow the first end of conveying part path of travel direction is provided with first deflector roll and second deflector roll, follows the second end of conveying part path of travel direction is provided with third deflector roll and fourth deflector roll, first deflector roll and fourth deflector roll are located the outside of solution tank, second deflector roll and third deflector roll are located the inside of solution tank.
3. The stretching apparatus of a polarizing film sheet as claimed in claim 1, wherein: the clamping part is an electric clamping part.
4. The stretching device of the polarizing film as claimed in claim 3, wherein: the first conveying piece and the second conveying piece are both annular chains; the fixture further comprises a frame, the fixing portion comprises a chain clamp, a first end of the chain clamp is fixed on the annular chain, a second end of the chain clamp is fixed on the frame, the clamping portion is of a shifting lever structure, and the shifting lever structure is movably connected with the frame.
5. The stretching device of the polarizing film as claimed in claim 4, wherein: still include the casing, the casing is located above the liquid level of solution, driving piece, first conveying, second conveying and the fixed part of anchor clamps all is located the inside of casing, the clamping part is located the outside of casing, the bottom of casing has the permission the opening that the frame of anchor clamps passes through.
6. The stretching apparatus of a polarizing film sheet as claimed in claim 5, wherein: the running track of the annular chain is not in a horizontal plane.
7. The stretching apparatus of a polarizing film sheet as claimed in claim 6, wherein: the chain type conveyor is characterized by further comprising a track, wherein the annular chains are arranged on the track, a first parallel section, an expansion section and a second parallel section which are sequentially connected are formed between the two annular chains along the direction of a traveling path, and the distance between the two chains on the first parallel section is smaller than the distance between the two chains on the second parallel section.
8. A method of manufacturing a polarizing film, comprising:
a dyeing procedure: dyeing a single-layer polyvinyl alcohol resin film having a thickness of 3 μm or more or a laminated film obtained by laminating the single-layer polyvinyl alcohol resin film with a base film with a dichroic dye to obtain a dyed film;
a stretching process: clamping the dyed film by a clamp in a solution to perform transverse stretching along the width direction of the dyed film;
the clamp comprises a clamping part and a fixing part, wherein the clamping part of the clamp is used for clamping the dyed membrane so that the dyed membrane is stretched in the solution, and the fixing part is positioned above the liquid level of the solution in the stretching process of the dyed membrane.
9. The method of manufacturing a polarizing film according to claim 8, wherein: the transverse stretching magnification in the transverse stretching step is 4 times or more.
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| US20110287224A1 (en) * | 2009-01-19 | 2011-11-24 | Nitto Denko Corporation | Method for producing retardation film, optical film, image display device, liquid crystal display device, and retardation film |
| CN103389535A (en) * | 2012-05-11 | 2013-11-13 | 日东电工株式会社 | Method for manufacturing polarizing film, polarizing film, polarizing plate and image display device |
| CN104937459A (en) * | 2013-01-28 | 2015-09-23 | 住友化学株式会社 | Process for manufacturing polarizing film |
| CN106990468A (en) * | 2015-09-24 | 2017-07-28 | 日东电工株式会社 | The manufacture method of optical anisotropic film |
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- 2021-01-26 CN CN202110104806.5A patent/CN112698521B/en active Active
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| US20110287224A1 (en) * | 2009-01-19 | 2011-11-24 | Nitto Denko Corporation | Method for producing retardation film, optical film, image display device, liquid crystal display device, and retardation film |
| CN103389535A (en) * | 2012-05-11 | 2013-11-13 | 日东电工株式会社 | Method for manufacturing polarizing film, polarizing film, polarizing plate and image display device |
| CN104937459A (en) * | 2013-01-28 | 2015-09-23 | 住友化学株式会社 | Process for manufacturing polarizing film |
| CN106990468A (en) * | 2015-09-24 | 2017-07-28 | 日东电工株式会社 | The manufacture method of optical anisotropic film |
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Effective date of registration: 20231228 Address after: No. 601, Huanping Road, Central Community, Pingdi Street, Longgang District, Shenzhen City, Guangdong Province, 518117 Patentee after: Shenzhen sanlipu Photoelectric Technology Co.,Ltd. Address before: 518000 buildings 1-9, No.5, tongfuyi Road, second industrial zone, Loucun community, Gongming office, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN SUNNYPOL OPTOELECTRONICS Co.,Ltd. |