TWI727746B - System and method for manufacturing polarizer, and polarizer manufactured by the same - Google Patents

Abstract

A system and a method for manufacturing a polarizer, and a polarizer manufactured by the same are provided. The method comprises a first moistening-heating step. The first moistening-heating step is for moistening and heating a polarizer precursor at the same time.

Description

System for manufacturing polarizing film and method for manufacturing polarizing film And the polarizing film made by it

The present invention relates to a system for manufacturing a polarizing film, a method for manufacturing a polarizing film, and a polarizing film manufactured therefrom.

Polarizers are optical components that are widely used in liquid crystal displays. With the increasing application of liquid crystal displays, such as mobile phones, wearable devices, etc., the requirements for the quality of polarizers are getting higher and higher. After the polarizing plate is manufactured, it is usually attached to displays of various sizes with a protective film or a release film.

The present invention relates to a system for manufacturing a polarizing film, a method of manufacturing a polarizing film, and a polarizing film manufactured therefrom.

According to one aspect of the present invention, a system for manufacturing a polarizing film is provided, which includes a first humidification and heating device. The first humidification and heating device is used for simultaneously humidifying and heating a polarizing film precursor.

According to another aspect of the present invention, a method of manufacturing a polarizing film is provided, which includes a first humidification and heating step. The first humidification and heating step is to simultaneously humidify and heat a polarizing film precursor.

According to yet another aspect of the present invention, a polarizing film is provided, which is manufactured by a manufacturing method. The method includes a first humidification and heating step. The first humidification and heating step is to simultaneously humidify and heat a polarizing film precursor. In order to simultaneously humidify and heat a polarizing film precursor.

In order to have a better understanding of the above and other aspects of the present invention, the following specific examples are given in conjunction with the accompanying drawings to describe in detail as follows:

100: Polarizing film precursor

100S1: the surface of the first polarizing film

100S2: The surface of the second polarizing film

100': Polarizing film

200: process slot

300: The first humidification and heating device

302: The first roller

304: first tank

306: first solution

400: The second humidification and heating device

402: second roller

404: second tank

406: second solution

500: Drying device

510: Drying Room

520A: Drying roller

520B: Drying roller

530A: Air supply mechanism

530B: Air supply mechanism

Figure 1 shows a system for manufacturing a polarizing film and a manufacturing method of the polarizing film.

The embodiments of the present invention will be described in detail below with the accompanying drawings. It should be noted that the following figures are not drawn to scale. In fact, the size of the elements may be arbitrarily enlarged or reduced in order to clearly show the characteristics of the present invention. In the specification and drawings, the same or similar elements will be represented by similar symbols.

Many different implementation methods or examples are disclosed below to implement different features of the present invention. The following describes specific elements and examples of their arrangement to illustrate the present invention. Of course, these are only examples and should not be used to limit the scope of the present invention. In addition, repeated reference numbers or labels may be used in different embodiments, and these repetitions are only for the sake of simplicity. Clearly describing the disclosure does not mean that there is a specific relationship between the different embodiments and/or structures discussed.

Furthermore, it should be understood that there may be additional operation steps before, during, or after the method is performed, and some of the described operation steps may be replaced or deleted in the method of other embodiments.

Please refer to Figure 1, which is used to illustrate the system for manufacturing the polarizing film 100' and the manufacturing method of the polarizing film 100'. The polarizing film precursor 100 can be conveyed to the process tank 200 by a conveying device including, for example, a roller, and then the first humidification and heating device 300, then the second humidification and heating device 400, and then the drying device 500 for processing, thereby obtaining Polarizing film 100'. The rollers can follow the transportation of the polarizing film precursor 100 to follow the rotation. The polarizing film precursor 100 may be a polyvinyl alcohol (PVA) film. Polyvinyl alcohol can be formed by saponifying polyvinyl acetate. In some embodiments, polyvinyl acetate may be a monomer of vinyl acetate or a copolymer of vinyl acetate and other monomers. The above-mentioned other monomers may be unsaturated carboxylic acids, olefins, unsaturated sulfonic acids, vinyl ethers, and the like. In other embodiments, the polyvinyl alcohol may be modified polyvinyl alcohol, for example, polyvinylformal modified by aldehydes, polyvinyl acetal or polyvinyl butyral ( Polyvinylbutyral) and so on.

The process tank 200 may include one or more swelling tanks, dyeing tanks, cross-linking tanks, color correction tanks, or washing tanks. The polarizing film precursor 100 can be swelled through a swelling tank. The polarizing film precursor 100 can be dyed through a dyeing tank. The polarizing film precursor 100 can be cross-linked through the cross-linking groove, thereby the polarizing film precursor 100 can be cross-linked. Carry out water resistance treatment or adjust its color tone. The bath solution in the cross-linking bath may contain boric acid, potassium iodide, zinc iodide, or a combination of the above. Boric acid is the cross-linking agent, and potassium iodide and zinc iodide are used for optical adjustment. The hue of the polarizing film can be adjusted by changing its concentration. When performing the cross-linking treatment, the polarizing film precursor 100 may also be subjected to the stretching treatment at the same time. The stretching process can be generated by the difference in the conveying rate between the conveying devices disposed at the entrance and the exit of the process tank 200, for example, by using the method of the difference in the peripheral speed of the rollers. The polarizing film precursor 100 can be subjected to color correction processing through the color correction tank to adjust the polarizing film precursor 100 to achieve the desired hue of the polarizing film 100 ′. The bath liquid in the complementary color bath can have similar or even the same composition as the bath liquid in the cross-linking bath. The polarizing film precursor 100 formed after passing through the cross-linking tank and/or the complementary color tank may pass through a washing tank (for example, a water washing tank) to wash the reaction solution adhering to the surface of the polarizing film precursor 100.

Then, the polarizing film precursor 100 is transferred to the first humidifying and heating device 300 to perform the first humidifying and heating step, which simultaneously humidifies and heats the polarized film precursor 100. Before being conveyed to the drying device 500 for drying, humidifying and heating the stretched polarizing film precursor 100 can increase the transmittance Ty and the degree of polarization Py of the polarizing film 100 ′. The heating treatment performed on the polarizing film precursor 100 here can be regarded as a pre-heating treatment before being conveyed to the drying device 500 for drying, which can reduce the temperature difference with the heating temperature of the drying device 500, and avoid undesirable caused by the temperature difference. The deviation of the structural properties of the polarizing film can improve the product yield of the polarizing film 100'. The first humidification and heating device 300 includes a first roller 302 and a first liquid tank 304. The first liquid tank 304 contains a first solution 306. The opposite surfaces of the first roller 302 respectively contact the first solution 306 and the first polarizing film surface 100S1 of the polarizing film precursor 100. In this way, the first roller 302 is removed from the first polarizing film surface 100S1 of the first solution 306 and the polarizing film precursor 100. The first solution 306 attached to a liquid tank 304 can roll along the first roller 302 and be transported to the first polarizing film surface 100S1 of the polarizing film precursor 100, thereby coating the first solution 306 on the first polarizing film The surface 100S1 is used to humidify the polarizing film precursor 100. Applying the first solution 306 to the surface 100S1 of the first polarizing film by adhesion method can prevent the problem of incomplete drying of the polarizing film precursor 100 in the drying device 500 caused by excessive solution, and improve the drying efficiency of the polarizing film precursor 100. In addition, it can also prevent too much solution from being absorbed by the polarizing film precursor 100 and affecting the properties of the polarizing film 100'. In this way, the product yield of the polarizing film 100' can be improved. In an embodiment, the first roller 302 may be a heating roller with a heating function, and the temperature is, for example, 30 to 70° C., and in one embodiment, the temperature is, for example, 40 to 60° C. In one embodiment, the first liquid tank 304 has a heating function, and can heat the first solution 306 at a temperature of, for example, 30 to 70°C. In one embodiment, the temperature is, for example, 40 to 60°C, so that the heated first solution can be used. A solution 306 heats the polarizing film precursor 100 by contacting the polarizing film precursor 100.

Then, in another embodiment, the polarizing film precursor 100 can be transported to the second humidifying and heating device 400 to perform the second humidifying and heating step, which simultaneously humidifies and heats the polarized film precursor 100. Before being conveyed to the drying device 500 for drying, humidifying and heating the stretched polarizing film precursor 100 can increase the transmittance Ty and the degree of polarization Py of the polarizing film 100 ′. The heating treatment performed on the polarizing film precursor 100 here can be regarded as a pre-heating treatment before being conveyed to the drying device 500 for drying, which can reduce the temperature difference with the heating temperature of the drying device 500, and avoid undesirable caused by the temperature difference. The deviation of the structural properties of the polarizing film can improve the product yield of the polarizing film 100'. The second humidification and heating device 400 includes a second roller 402 and a second liquid tank 404. The second liquid tank 404 contains a second solution 406. The opposite surfaces of the second roller 402 are in contact with the second solution 406 and the second polarizing film surface 100S2 of the polarizing film precursor 100, respectively, so that the second solution 406 attached to the second roller 402 from the second liquid tank 404 can be Rolling along the second roller 402 and conveying to the second polarizing film surface 100S2 of the polarizing film precursor 100, so that the second solution 406 is applied to the second polarizing film surface 100S2 to humidify the polarizing film precursor 100. Coating the second solution 406 on the surface 100S2 of the second polarizing film by adhesion method can prevent the problem of incomplete drying of the polarizing film precursor 100 in the drying device 500 caused by excessive solution, and improve the drying efficiency of the polarizing film precursor 100. In addition, it can also prevent too much solution from being absorbed by the polarizing film precursor 100 and affecting the properties of the polarizing film 100'. In this way, the product yield of the polarizing film 100' can be improved. In an embodiment, the second roller 402 may be a heating roller with a heating function, and the temperature is, for example, 30 to 70° C., and in one embodiment, the temperature is, for example, 40 to 60° C. In one embodiment, the second liquid tank 404 has a heating function, and can heat the second solution 406 at a temperature of, for example, 30 to 70°C. In one embodiment, the temperature is, for example, 40 to 60°C, so that the heated second solution can be used. The second solution 406 reaches the function of heating the polarizing film precursor 100 by contacting the polarizing film precursor 100.

The first solution 306 of the first liquid tank 304 and/or the second solution 406 of the second liquid tank 404 may contain alcohol and/or water. The first solution 306 of the first liquid tank 304 and/or the second solution 406 of the second liquid tank 404 may be an antistatic solution, containing a solvent and an antistatic agent, attached to the first polarizing film surface 100S1 of the polarizing film precursor 100 And/or the second polarizing film surface 100S2 can avoid the phenomenon of electrostatic adsorption, reducing or preventing impurities from adhering to it, thereby improving the quality of the polarizing film 100'. Antistatic The solvent package of the solution may contain alcohol and water. In one embodiment, assuming that the solvent contains 100% alcohol and water, the weight percentage of the antistatic agent is about 0.1 to 5% of the solvent, which can achieve an excellent antistatic effect. Taking the solvent as 100%, in one embodiment, the ratio of alcohol and water can be between 1:1 to 3:7, and the composition of 3:7 has a better antistatic effect (compared to the former Words).

The antistatic agent is, for example, an ionic compound having an organic cation and having a melting point of 25°C or more and 50°C or less. By using an ionic compound with a melting point of 25°C or higher, that is, an ionic compound that is solid at room temperature, changes in antistatic performance over time can be suppressed, in other words, antistatic performance can be maintained for a long time. From the viewpoint of long-term stability of antistatic performance, the ionic compound is more preferably one having a melting point of 30°C or higher, or 35°C or higher.

Examples of cationic components constituting the ionic compound include imidazolium cations, pyridinium cations, ammonium cations, sulfonium cations, and phosphonium cations. Among these ions, when used in the solvent of the antistatic solution of the embodiment of the present invention, from the viewpoint that they are not easily charged when adhering to the polarizing film precursor 100, pyridinium cations or imidazolium cations are preferred .

On the other hand, in the ionic compound, to become the above-described anion component may be an anionic inorganic ions, the cation may also be an organic anion of the component, for example, by the following: chlorine anions [Cl ^-], bromine anion [Br ^-], iodide anion [the I ^-], tetrachloroaluminate anion [AlCl ₄ ^-], heptachlorodialuminate anion [Al ₂ Cl ₇ ^-], tetrafluoroborate anion [BF ₄ ^-], hexafluoro phosphate anions [PF ₆ ^-], perchlorate anion [ClO ₄ ^-], nitrate anion [NO ₃ ^-], acetate anion [CH ₃ COO ^-], trifluoroacetate anion [CF ₃ COO ^-] , fluorosulfonate anion [FSO ₃ ^-], methanesulfonate anion [CH ₃ SO ₃ ^-], trifluoromethanesulfonate anion [CF ₃ SO ₃ ^-], p-toluenesulfonate anion [p-CH ^{_{3 C 6 H 4 SO 3 -}} ], bis (sulfo-fluoro-acyl) acyl imide anion ^{_{[(FSO 2) 2 N -}} ], bis (trifluoromethanesulfonyl acyl) acyl imide anion [(CF ₃ SO ₂ ) ₂ N ^-], tris (trifluoromethanesulfonyl acyl) methide anion _{[(CF 3 SO 2) 3} C -], hexafluoroarsenate anion [AsF ₆ ^-], hexafluoroantimonate anion [ SbF ₆ ^-], hexafluoro niobate anions [NbF ₆ ^-], six tantalum fluoride anions [TaF ₆ ^-], dimethylsilylene phosphonate anion ^{_{[(CH 3) 2 POO -}} ], ( poly) hydrogen fluoride fluoride anion ^{_{[F (HF) n -]}} (n is about 1 to 3), dicyanamide anion ^{_{[(CN) 2 N -]}} , thiocyanate anion [SCN ^-], perfluorobutanesulfonate anion ^{_{[C 4 F 9 SO 3 -}} ], bis (pentafluoroethane sulfonyl acyl) acyl imide anion _{[(C 2 F 5 SO 2} ) 2 N -], perfluoro butyrate anion [C ₃ F ₇ COO ^- ], (trifluoromethanesulfonyl acyl) (trifluoromethane-carbonyl) acyl imide anion _{[(CF 3 SO 2) (} CF 3 CO) N -] and the like.

Among these anions, especially anion components containing fluorine atoms provide ionic compounds with excellent antistatic properties, so they can be preferably used, especially hexafluorophosphate anions, bis(fluorosulfonyl)imide Anion and bis(trifluoromethanesulfonyl)imide anion.

Specific examples of the ionic compound used in the examples of the present invention can be appropriately selected from the combination of the above-mentioned cationic components and anionic components. Specific examples of the compound of a combination of a cationic component and an anionic component include the following.

‧Pyridinium salt: N-hexylpyridinium hexafluorophosphate, N-octylpyridinium hexafluorophosphate, N-methyl-4-hexylpyridinium hexafluorophosphate, N-butyl-4-methyl Pyridinium hexafluorophosphate, N-octyl-4-methylpyridinium hexafluorophosphate, N-hexylpyridinium bis(fluorosulfonyl) imide, N-octylpyridinium bis(fluorosulfonyl) Base) imine, N-methyl-4-hexylpyridinium bis(fluorosulfonyl)imide, N-butyl-4-methylpyridinium bis(fluorosulfonyl)imide, N-octyl-4- Methylpyridinium bis(fluorosulfonyl)imide, N-hexylpyridinium bis(trifluoromethanesulfonyl)imide, N-octylpyridinium bis(trifluoromethanesulfonyl)imide Amine, N-methyl-4-hexylpyridinium bis(trifluoromethanesulfonyl)imide, N-butyl-4-methylpyridinium bis(trifluoromethanesulfonyl)imide, N -Octyl-4-methylpyridinium bis(trifluoromethanesulfonyl)imide, N-hexylpyridinium p-toluenesulfonate, N-octylpyridinium p-toluenesulfonate, N-methyl -4-hexylpyridinium p-toluenesulfonate, N-butyl-4-methylpyridinium p-toluenesulfonate, N-octyl-4-methylpyridinium p-toluenesulfonate, and the like.

‧Imidazolium salt: 1-ethyl-3-methylimidazolium hexafluorophosphate, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imidine, 1-ethyl-3- Methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-ethyl-3-methylimidazolium p-toluenesulfonate, 1-butyl-3-methylimidazolium methanesulfonate, etc. .

‧Pyrrolidinium salt: N-butyl-N-methylpyrrolidinium hexafluorophosphate, N-butyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide, N-butyl -N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide, N-butyl-N-methylpyrrolidinium p-toluenesulfonate, etc.

‧Ammonia salt: tetrabutylammonium hexafluorophosphate, tetrabutylammonium bis(fluorosulfonyl) imide, tetrahexylammonium bis(fluorosulfonyl) imide, trioctyl methyl ammonium bis( Fluorosulfonyl)imidine, (2-hydroxyethyl)trimethylammonium bis(fluorosulfonyl)imid, tetrabutylammonium bis(trifluoromethanesulfonyl)imid, tetrahexyl Ammonium bis(trifluoromethanesulfonyl)imid, trioctylmethylammonium bis(trifluoromethanesulfonyl)imid, (2-hydroxyethyl)trimethylammonium bis (Trifluoromethanesulfonyl) imine, tetrabutylammonium p-toluenesulfonate, tetrahexylammonium p-toluenesulfonate, trioctylmethylammonium p-toluenesulfonate, (2-hydroxyethyl) Trimethylammonium p-toluenesulfonate, (2-hydroxyethyl)trimethylammonium dimethylphosphonite, etc.

This ionic compound can be used individually or in combination of 2 or more types, respectively.

In addition, in one embodiment, the ionic compound of the present invention may be a pyridinium cation, and the structural formula (1) of the compound is as follows:

The cation of the pyridinium salt of the structural formula (1) is, for example, an N-alkylpyridinium cation. _{R 3 in the} structural formula (1) represents a linear alkyl group having 12 to 16 carbon atoms. The cation of structural formula (1) is, for example, N-dodecylpyridinium ion, N-tridecylpyridinium ion, N-tetradecylpyridinium ion, N-pentadecylpyridinium ion, N-hexadecane Pyridinium ion, N-dodecyl-4-methylpyridinium ion, N-tridecyl-4-methylpyridinium ion, N-tetradecyl-4-methylpyridinium ion, N-pentadecyl Alkyl-4-methylpyridinium ion or N-hexadecyl-4-methylpyridinium ion.

In the structural formula (1), R4 represents a hydrogen atom or a methyl group, and X- represents an ion having a fluorine atom. X- in the pyridinium salt is fluoride ion, tetrafluoroborate ion, hexafluorophosphate ion, trifluoroacetate ion, trifluoromethanesulfonate ion, bis(fluorosulfonyl)imide ion, bis(trifluoro) (Fluoromethanesulfonyl)imide ion, tris(trifluoromethanesulfonyl)methane ion, hexafluoroarsenate ion, hexafluoroantimonate ion, hexafluoroniobate ion, hexafluorotantalate ion, (poly) Hydrofluoride fluoride ion, perfluorobutane sulfonic acid Salt ion, bis(pentafluoroethanesulfonyl)imide ion, perfluorobutyric acid ion or (trifluoromethanesulfonyl)(trifluoromethanecarbonyl)imide ion.

^{Since the anion component X-} of the pyridinium salt of the structural formula is an ion having a fluorine atom, an ionic compound having excellent antistatic performance can be obtained. Specifically, the anion is, for example: fluoride ion [F ^-], tetrafluoroborate ion [BF ₄ ^-], hexafluorophosphate ion [PF ₆ ^-], trifluoroacetate ion, [CF ₃ COO ^-], trifluoromethanesulfonate ions [CF ₃ SO ₃ ^-], bis (fluorosulfonyl) imide ion ^{_{[(FSO 2) 2 N -}} ], bis (trifluoromethanesulfonyl) imide ion [(CF ₃ SO _{2) 2} N ^-], tris (trifluoromethanesulfonyl) methane ion _{[(CF 3 SO 2) 3} C -], hexafluoroarsenate ion [AsF ₆ ^-], hexafluoroantimonate ion [SbF ₆ ^- ], niobium hexafluorophosphate ion [NbF ₆ ^-], hexafluoro tantalate ions [TaF ₆ ^-], (poly) fluoro hydrofluoric acid ion ^{_{[F (HF) n -]}} (n is about 1 to 3), perfluorobutane sulfonate ion ^{_{[C 4 F 9 SO 3 -}} ], bis (pentafluoroethane sulfonyl) imide ion _{[(C 2 F 5 SO 2} ) 2 N -], perfluorinated acid ion [C ₃ F ₇ COO ^-], (trifluoromethanesulfonyl) (carbonyl trifluoromethanesulfonyl) imide ion _{[(CF 3 SO 2) (} CF 3 CO) N -] and the like.

Specific examples of the pyridinium salt used in the embodiment of the present invention can be appropriately selected from the combination of the aforementioned cation and anion. Specific examples of compounds composed of cations and anions are: N-dodecylpyridine hexafluorophosphate, N-tetradecylpyridine hexafluorophosphate, N-hexadecylpyridine hexafluorophosphate, N- Dodecyl-4-methylpyridine hexafluorophosphate, N-tetradecyl-4-methylpyridine hexafluorophosphate, N-hexadecyl-4-methylpyridine hexafluorophosphate, N -Dodecylpyridine bis(fluorosulfonyl)imide, N-tetradecylpyridine bis(fluorosulfonyl)imide, N-hexadecylpyridine bis(fluorosulfonyl)imide, N-dodecyl-4-methylpyridine bis(fluorosulfonyl) Imide, N-tetradecyl-4-methylpyridine bis(fluorosulfonyl)imide, N-hexadecyl-4-methylpyridine bis(fluorosulfonyl)imide, N- Dodecylpyridine bis(trifluoromethanesulfonyl)imide, N-tetradecylpyridine bis(trifluoromethanesulfonyl)imide, N-hexadecylpyridine bis(trifluoromethanesulfonyl) )Imide, N-dodecyl-4-methylpyridinium bis(trifluoromethanesulfonyl)imide, N-tetradecyl-4-methylpyridinium bis(trifluoromethanesulfonyl) Imide, N-hexadecyl-4-methylpyridinium bis(trifluoromethanesulfonyl)imide and the like.

。 The pyridinium salt is N-dodecylpyridine bis(trifluoromethanesulfonyl)imide, for example:

.

。 The pyridinium salt is N-hexadecylpyridine bis(trifluoromethanesulfonyl)imide, for example:

.

。 The structural formula of pyridinium salt as N-dodecylpyridine hexafluorophosphate is, for example:

.

。 The structural formula of pyridinium salt as N-hexadecylpyridinium hexafluorophosphate is, for example:

.

。 The structural formula of pyridinium salt as N-hexyl-4-methylpyridine hexafluorophosphate is, for example:

.

。 The structural formula of pyridinium salt as N-butyl-4-methylpyridine hexafluorophosphate is, for example:

.

The pyridinium salt of structural formula (1) is characterized in that the alkyl group represented _{by R 3 is a long chain.} The pyridinium salt can be prepared by a common preparation method, for example, the following structural formula (2).

Define the structural formula R (2) R ₃ and R ₄ is the same in the formula (1) Definition of R ₄ and _3. Structural formula (2) corresponds to alkyl pyridinium bromide. By corresponding to LiX ^- (wherein X ^- The structure of formula (1)) a lithium salt ion exchange reaction, then washed with water, the resulting aqueous phase is transferred to lithium bromide, prepared based on the organic phase, can be made The pyridinium salt of structural formula (1). These pyridinium salts may be used singly or in combination of two or more. In addition, examples of the pyridinium salt are of course not limited to the compounds listed above.

Then, the polarizing film precursor 100 is transferred to a drying device 500 for drying, thereby obtaining a polarizing film 100'. The drying device 500 may include a drying chamber 510, drying rollers 520A, 520B, and/or air blowing mechanisms 530A, 530B. The drying rollers 520A and 520B and/or the air blowing mechanism 530A and 530B are arranged in the drying chamber 510. The drying rollers 520A and 520B may have the function of heating and/or blowing drying gas, thereby drying the polarizing film precursor 100 conveyed thereon. In one embodiment, the drying roller (including the drying roller 520A and/or the drying roller 520B) is a heating roller.

In some embodiments, the temperature of the drying roller is, for example, 30°C to 140°C. In some embodiments, the temperature of the drying roller is, for example, 40°C to 100°C. In some embodiments, the temperature of the drying roller is, for example, 70°C to 90°C. In some embodiments, the temperature of the drying roller is substantially lower than the temperature at which the optical film 20 is heated and deteriorated. For example, in some embodiments, the optical film 20 is a polyvinyl alcohol (PVA) film, and the temperature of the drying roller is, for example, 100° C. or less.

In one embodiment, an air supply device (not shown) is connected to the drying roller, and the conveying surface of the drying roller facing the polarizing film precursor 100 has a plurality of air outlets, and the air supply device transmits the drying gas into the drying roller, and the drying gas The polarizing film precursor 100 is blown from the inside of the drying roller through the air outlet to the polarizing film precursor 100 on the conveying surface to dry the polarizing film precursor 100. The polarizing film precursor 100 is located between the drying roller 520A and the air blowing mechanism 530A, and between the drying roller 520B and the air blowing mechanism 530B.

In some embodiments, the temperature of the drying gas is, for example, 30°C to 140°C. In some embodiments, the temperature of the drying gas is, for example, 40°C to 100°C. In some embodiments, the temperature of the drying gas is, for example, 70°C to 90°C. In some embodiments, the temperature of the drying gas is substantially lower than the temperature at which the optical film 20 is heated and deteriorated. For example, in some embodiments, the optical film 20 is a polyvinyl alcohol (PVA) film, and the temperature of the drying gas is equal to or less than 100° C., for example.

In some embodiments, the temperature of the air sent by the air blowing mechanism (including the air blowing mechanism 530A and/or the air blowing mechanism 530B) may be higher than or equal to the heating temperature of the drying roller (including the drying roller 520A and/or the drying roller 520B), Or it can be higher than or equal to the temperature of the air sent by the drying roller.

In one embodiment, the heating temperature of the first humidification and heating device 300 is It is equal to or greater than the heating temperature of the second humidification and heating device 400.

In some embodiments, the heating temperature of the drying device 500 may be higher than or equal to the heating temperature of the first humidification and heating device 300 and/or the second humidification and heating device 400. In one embodiment, the heating temperature of the first humidification and heating device 300 is 50°C, the heating temperature of the second humidification and heating device 400 is 60°C, and the drying roller (including the drying roller 520A and/or the drying roller 520B The heating temperature of) is 70°C, and the temperature of the gas sent by the air blowing mechanism (including the air blowing mechanism 530A and/or the air blowing mechanism 530B) is 80°C. By providing the gradual heating to the polarizing film precursor 100, it is possible to avoid the sudden application of high heat to damage the optical quality of the polarizing film precursor 100.

In some embodiments, a heating device (not shown) can also be optionally provided in the drying chamber 510. The heating device is, for example, an infrared heating plate to maintain the drying chamber 510 at a fixed temperature. In some embodiments, the drying chamber 510 of the drying device 500 is a substantially closed space.

To sum up, although the present invention has been disclosed as above by embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to those defined by the attached patent scope.

100: Polarizing film precursor

100S1: the surface of the first polarizing film

100S2: The surface of the second polarizing film

100': Polarizing film

200: process slot

300: The first humidification and heating device

302: The first roller

304: first tank

306: first solution

400: The second humidification and heating device

402: second roller

404: second tank

406: second solution

500: Drying device

510: Drying Room

520A: Drying roller

520B: Drying roller

530A: Air supply mechanism

530B: Air supply mechanism

Claims (12)

A system for manufacturing a polarizing film includes: a first humidification and heating device for simultaneously humidifying and heating a polarizing film precursor, wherein a first solution is used to humidify the polarizing film precursor, and the first The solution contains an antistatic agent; a process tank, wherein the polarizing film precursor is processed by the first humidification heating device after being processed by the process tank; and a drying device, wherein the polarizing film precursor is processed by the second After treatment by a humidifying and heating device, it is treated by the drying device. The system for manufacturing a polarizing film according to claim 1, wherein the first humidification and heating device includes a first roller and a first liquid tank, the first liquid tank contains the first solution, the first The opposite surfaces of the roller respectively contact the first solution and a first polarizing film surface of the polarizing film precursor, and the first roller and/or the first liquid tank have a heating function. The system for manufacturing a polarizing film according to claim 1, further comprising a second humidification and heating device configured to simultaneously humidify and heat the polarizing film precursor after the first humidification and heating device, wherein the first humidification and heating device A humidification and heating device and the second humidification and heating device respectively humidify a first polarizing film surface and a second polarizing film surface opposite to the polarizing film precursor. The system for manufacturing a polarizing film according to claim 3, wherein the second humidification and heating device includes a second roller and a second liquid tank, the second liquid tank contains a second solution, and wherein the The second roller and/or the second liquid tank have a heating function, and/or the second solution contains an antistatic agent. The system for manufacturing a polarizing film according to claim 1, wherein the heating temperature processed by the first humidifying and heating device is equal to or lower than the drying device. A method of manufacturing a polarizing film includes: a first humidification and heating step, which is to simultaneously perform humidification and heating treatment on a polarizing film precursor, wherein the first humidification and heating step is to use a first solution to humidify the A polarizing film precursor, the first solution containing an antistatic agent; before the first humidifying and heating step, the polarizing film precursor is passed through a process slot; and after the first humidifying and heating step, the polarizing film is dried Precursor to obtain the polarizing film. The method for manufacturing a polarizing film according to claim 6, wherein the first humidification and heating step is to use a first roller and/or the first solution to heat the polarizing film precursor. The method for manufacturing a polarizing film according to claim 7, wherein the first humidification and heating step is to perform a humidification treatment on a first polarizing film surface of the polarizing film precursor. The method for manufacturing a polarizing film according to claim 6, further comprising a second humidifying and heating step, in order to simultaneously humidify and heat the polarizing film precursor, the second humidifying and heating step is performed in the first After a humidification and heating step, wherein the first humidification and heating step and the second humidification and heating step respectively humidify a first polarizing film surface and a second polarizing film surface opposite to the polarizing film precursor deal with. The method for manufacturing a polarizing film according to claim 9, wherein the second humidification and heating step is to humidify the polarizing film precursor with a second solution, and use a second roller and/or the second solution to heat The polarizing film precursor and/or the second solution contain an antistatic agent. The system for manufacturing a polarizing film according to claim 6, wherein the heating temperature of the first humidifying and heating step is equal to or less than the heating temperature of drying the polarizing film precursor. A polarizing film manufactured by the manufacturing method according to one of claims 6 to 11.

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