CN108715044B - Stretching process of high-contrast light-leakage-proof light-deflecting sheet - Google Patents
Stretching process of high-contrast light-leakage-proof light-deflecting sheet Download PDFInfo
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- CN108715044B CN108715044B CN201810447488.0A CN201810447488A CN108715044B CN 108715044 B CN108715044 B CN 108715044B CN 201810447488 A CN201810447488 A CN 201810447488A CN 108715044 B CN108715044 B CN 108715044B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00634—Production of filters
- B29D11/00644—Production of filters polarizing
Abstract
The invention discloses a stretching process of a high-contrast light-leakage-proof light-deflecting sheet, which comprises the following steps: selecting a PVA film with a polymerization degree of 2400, washing the PVA film at 17-20 ℃ at a stretching speed of 1-1.3 m/min, swelling the PVA film at 25-30 ℃ at a stretching speed of 1.5-1.8 m/min, dyeing the PVA film at 15-20 ℃ at a stretching speed of 2.5-3 m/min, washing off floating color at 25-30 ℃ at a stretching speed of 3.5-4 m/min, performing accelerated stretching at 30-40 ℃ at a stretching speed of 4-5 m/min, performing accelerated stretching at 40-50 ℃ at a stretching speed of 5-6 m/min, performing color adjustment at 8-12 ℃ at a stretching speed of 7-7.5 m/min, cleaning the PVA film at 15-17 ℃, drying the PVA film at 40-50 ℃, laminating the PVA film with a polaroid in turn, drying the laminated PVA film in an oven with four sections at 40-50 ℃, and cooling the PVA film to obtain a finished product; the optical performance, the visual angle range and the durability of the prepared polaroid are superior to those of a common polaroid, and the requirements of electronic products in the prior art on the performance of the polaroid are met.
Description
Technical Field
The invention relates to the technical field of preparation of polarizers, in particular to a stretching process of a high-contrast light-leakage-proof polarizer.
Background
At present, the contrast performance parameters of optical products of iodine series and dye polaroids are as follows: the dichroism Rd is generally 30-50, the polarization degree of a product produced by the polarizer with low contrast is low and can only reach 95% -98%, and the reliability of the product is low and can only meet the dry temperature: 70 ℃ x 240H, high temperature, high humidity: the polaroid is used under the conditions of 40 ℃ multiplied by 95% multiplied by 240H, the application range of the polaroid is narrow, and the polaroid can only be used on daily common consumer products.
But with the increasing popularity of electronic products, the requirements for the polarizer are also more and more demanding; the polaroids used by mobile phones and vehicle-mounted displays require high contrast, dichroism Rd reaches more than 60, wide visual angle function and polarization degree reach more than 99.9%, and reliability reaches dry temperature: at 80-85 ℃ and 500H, high temperature and high humidity: 65 ℃ X95%. X500H.
It is seen that improvements and enhancements to the prior art are needed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a stretching process of a high-contrast light-leakage-preventing polaroid, and aims to solve the technical problems that in the prior art, an iodine polaroid cannot have the performances of high contrast, high temperature and high humidity resistance and the like at the same time, and the requirements of the prior electronic products on the polaroid cannot be met.
In order to achieve the purpose, the invention adopts the following technical scheme:
a stretching process of a high-contrast light-leakage-preventing light-deflecting sheet comprises the following steps:
s001, selecting a PVA film with the polymerization degree of 2400, and washing the PVA film with water through a first washing tank at the temperature of 17-20 ℃ at the stretching speed of 1-1.3 m/min;
s002, the washed PVA film enters a swelling tank at the temperature of 25-30 ℃ at a stretching speed of 1.5-1.8 m/min for swelling;
s003, enabling the swelled PVA film to enter a dyeing tank at 15-20 ℃ at a drawing speed of 2.5-3 m/min, and dyeing the PVA film by iodide ions;
s004, the dyed PVA film enters a second washing tank at 25-30 ℃ at a stretching speed of 3.5-4 m/min to wash away loose color;
s005, feeding the PVA film with the color floated after washing away into a stretching tank at the temperature of 30-40 ℃ at the stretching speed of 4-5 m/min for accelerated stretching;
s006, stretching the PVA film stretched in the first groove, and then entering a second stretching groove at 40-50 ℃ at a stretching speed of 5-6 m/min for accelerated stretching;
s007, feeding the stretched PVA film into a color complementing groove at the temperature of 8-12 ℃ at the stretching speed of 7-7.5 m/min for color adjustment;
s008, cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 15-17 ℃, drying at 40-50 ℃, bonding with a TAC film to form a polarizer, drying the bonded polarizer sequentially through four sections of drying ovens at 40-50 ℃, and cooling to obtain a finished product.
In the stretching process of the high-contrast light-leakage-preventing light-deflecting sheet, the PVA film comprises a PVA film with M-6000 polymerization degree 2400 synthesized in Japan.
In the stretching process of the high-contrast light-leakage-preventing light-deflecting sheet, the TAC films include a Japanese Konica KC4CT1W Z type TAC film and a Japanese Konica KC4UAW type TAC film.
In the stretching process of the high-contrast light-leakage-preventing light-deflecting sheet, in the step S001, the PVA film is washed with water through a first washing tank at 19 ℃ at a stretching speed of 1.22 m/min.
In the stretching process of the high-contrast light-leakage-preventing light-deflecting sheet, in the step S002, the washed PVA film enters a 28 ℃ swelling tank at a stretching speed of 1.79m/min to swell.
In the stretching process of the high-contrast light-leakage-preventing light-deflecting sheet, in the step S003, the swelled PVA film enters a 17 ℃ dyeing bath at a stretching speed of 2.99m/min, and is dyed by iodide ions.
In the stretching process of the high-contrast light-leakage-preventing light-deflecting sheet, in the step S004, the dyed PVA film enters a second washing tank at 30 ℃ at a stretching speed of 3.83m/min to be washed off with loose colors.
In the stretching process of the high-contrast light-leakage-preventing light-deflecting sheet, the PVA film with the color floated is washed off and enters a stretching tank at 39 ℃ at the stretching speed of 4.98m/min for accelerated stretching; then enters a second stretching groove with the temperature of 48 ℃ at the stretching speed of 5.93m/min for accelerated stretching.
In the stretching process of the high-contrast light-leakage-preventing light-deflection sheet, in the step S007, the stretched PVA film enters a color compensation groove at 10 ℃ at a stretching speed of 7.32m/min for color adjustment.
In the stretching process of the high-contrast light-leakage-prevention polarizer, in the step S008, the PVA film after color compensation enters a third cleaning tank at 16 ℃ to clean the film surface, then the PVA film is dried at 40 ℃, and then is bonded with the TAC film to form the polarizer, the bonded polarizer is dried sequentially through four sections of ovens at 50 ℃, and a finished product is obtained after cooling.
Has the advantages that:
the invention provides a stretching process of a high-contrast light-leakage-preventing polarizer, which is characterized in that a PVA film with high polymerization degree and a TAC film with wide visual angle compensation are selected, and the processes of ultrahigh stretching ratio and specific temperature condition are combined, so that the prepared polarizer finished product has good dichroism and light leakage prevention effect, good high-temperature and high-humidity resistance, good durability and wide visual angle, and meets the requirements of the existing electronic products on the performance of the polarizer.
Drawings
FIG. 1 is a flow chart of the drawing process of the high-contrast light-leakage-preventing light polarizer provided by the present invention.
Detailed Description
The invention provides a stretching process of a high-contrast light-leakage-preventing light-deflection sheet, which is described in further detail below by referring to the attached drawings and embodiments in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a stretching process of a high-contrast light-leakage-preventing polarizer, comprising the following steps:
s001, selecting a PVA (polyvinyl alcohol) film with the polymerization degree of 2400, and carrying out water washing through a first washing tank at the temperature of 17-20 ℃ at the stretching speed of 1-1.3 m/min;
s002, the washed PVA film enters a swelling tank at the temperature of 25-30 ℃ at a stretching speed of 1.5-1.8 m/min for swelling;
s003, enabling the swelled PVA film to enter a dyeing tank at 15-20 ℃ at a drawing speed of 2.5-3 m/min, and dyeing the PVA film by iodide ions;
s004, the dyed PVA film enters a second washing tank at 25-30 ℃ at a stretching speed of 3.5-4 m/min to wash away loose color;
s005, feeding the PVA film with the color floated after washing away into a stretching tank at the temperature of 30-40 ℃ at the stretching speed of 4-5 m/min for accelerated stretching;
s006, stretching the PVA film stretched in the first groove, and then entering a second stretching groove at 40-50 ℃ at a stretching speed of 5-6 m/min for accelerated stretching;
s007, feeding the stretched PVA film into a color complementing groove at the temperature of 8-12 ℃ at the stretching speed of 7-7.5 m/min for color adjustment;
s008, cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 15-17 ℃, drying at 40-50 ℃, bonding with a TAC (cellulose triacetate) film to form a polarizer, drying the bonded polarizer in four sections of ovens at 40-50 ℃, and cooling to obtain a finished product.
The method adopts the PVA film with high polymerization degree, and combines the technical processes of ultrahigh stretching ratio and specific temperature condition, so that the polaroid attached with the TAC film has excellent dichroism and light leakage prevention effect, the dichroism reaches more than 68, the polarization degree is higher than 99.9 percent, and the reliability is higher than dry temperature: at 80-85 ℃ and 500H, high temperature and high humidity: the material has the advantages of satisfying the requirements of the prior electronic products on the performance of the polaroid, widening the application range of the prior iodine polaroid and prolonging the service life of the polaroid by multiplying 95 percent by multiplying 500H at 65 ℃.
Preferably, the PVA film comprises a PVA film of Japanese synthetic M-6000 degree of polymerization 2400; the PVA film with high polymerization degree is beneficial to improving the iodine adsorption performance, so that the light leakage prevention performance of the polaroid is enhanced; however, the higher the cost of the PVA film having a higher polymerization degree, the higher the cost of the PVA film having a polymerization degree of M-6000 as synthesized in japan 2400, the PVA film having excellent transparency, excellent polar transparency, excellent affinity with iodine and the like, and high orientation during stretching, and the polarization and transmittance of the polarizer produced by matching the process conditions specified in the present application can satisfy the demand of the conventional electronic products.
Preferably, the TAC films include a Japanese Konica KC4CT1W Z-type TAC film and a Japanese Konica KC4 UAW-type TAC film; the TAC film has a good wide-view angle supplement function, the view angle of the produced polarizer can be greatly expanded, the final polarizer finished product has good wide-view performance without adding an optical compensation film, and the thickness and the preparation cost of the polarizer are reduced; and the TAC film is tightly attached to the PVA film with the Japanese synthetic M-6000 polymerization degree 2400, so that the defect of poor humidity and heat resistance of the PVA film is effectively overcome, and the good synergistic effect can be realized.
Preferably, in the step S001, the PVA film is washed with water through a first washing tank at 19 ℃ at a stretching speed of 1.22 m/min.
Preferably, in the step S002, the PVA film after washing is put into a swelling tank at 28 ℃ at a drawing speed of 1.79m/min to be swelled.
Preferably, in the step S003, the swollen PVA film is fed into a 17 ℃ dyeing bath at a drawing speed of 2.99m/min, and is dyed by iodide ions; the higher the dyeing temperature is, the more favorable the molecular activity is, the higher the dyeing rate is and the shorter the dyeing balance time is, but iodine is easy to sublime, and the PVA film can be partially dissolved in high-temperature water, so the dyeing temperature is not too high, and the applicant proves through a large number of experiments that the PVA film is ensured to have good dyeing effect at 17 ℃, the dyeing time is short, and a large amount of iodine can not be sublimated, so the property of the PVA film is not influenced; the stretching speed during dyeing is determined according to the final performance of the polarizer, such as monomer transmittance, polarization degree and other properties, and the effect is optimal when the stretching speed of 2.99m/min is selected on the basis of achieving the effect.
Preferably, in the step S004, the dyed PVA film enters a second washing tank at 30 ℃ at a stretching speed of 3.83m/min to wash away the loose color; the stretching speed and the temperature of the second cleaning tank can ensure that iodide ions on the dyed PVA film are stably fixed in a short time, and redundant loose colors are washed away, so that the uniform distribution of the iodide ions on the subsequent stretched PVA film is ensured.
Preferably, the PVA film after washing away the flooding enters a stretching tank at 39 ℃ at a stretching speed of 4.98m/min for accelerated stretching; then enters a second stretching groove with the temperature of 48 ℃ at the stretching speed of 5.93m/min for accelerated stretching. The higher the temperature of the stretching groove is, the higher the softness of the PVA film is, which is beneficial to improving the stretching ratio and improving the performance of the higher sheet; however, iodide ions are easy to sublimate at high temperature, and the PVA film can be partially dissolved in high-temperature water to seriously affect the mechanical property of the PVA film, so that the higher the temperature is, the better the temperature is; the applicant set the first accelerated stretching to be performed at a stretching speed of 4.98m/min at 39 ℃ and the second accelerated stretching to be performed at a stretching speed of 5.93m/min at 48 ℃ to perform the secondary stretching, thereby effectively improving the stretching ratio of the polarizer, making the most of the material properties, and ensuring the maximum improvement of the stretching ratio without damaging the material properties.
Preferably, in the step S007, the stretched PVA film enters a 10 ℃ color compensation tank at a stretching speed of 7.32m/min for color adjustment; after the color is complemented, the color of the polaroid is more uniform, and the polarization degree is higher.
Preferably, in the step S008, the PVA film after color compensation enters a third washing tank at 16 ℃ to wash the film surface, then is dried at 40 ℃, and then is bonded with a TAC film to form a polarizer, the bonded polarizer is dried sequentially by four sections of ovens at 50 ℃, and a finished product is obtained after cooling. The PVA film is dried before being laminated, so that the PVA film is further fixed in color and kept dry before being laminated, the subsequent working sections are convenient to carry out, the color fixing effect of the PVA film can be further improved under the condition of 40 ℃, and the PVA film can be dried uniformly and thoroughly in a short time; the temperature is too low, the fixation and drying time is too long, and the temperature is too high, so that the PVA film is easy to dry unevenly, the surface is dry, and the inner lining is not dry sufficiently.
TAC films are respectively attached to two sides of the dried PVA film, then a finished product is obtained after a plurality of drying procedures, the attached polarizer in the application is dried by four sections of oven with the temperature of 50 ℃, so that the adhesive between the film layers can be fully dried, the adhesion stability between the PVA film and the TAC film is improved, and the polarizer is dried to reach an ideal state.
Example 1
The stretching process of the high-contrast light-leakage-preventing light polarizer comprises the following steps of:
selecting a PVA film with a Japanese synthetic M-6000 polymerization degree of 2400, and carrying out water washing through a first washing tank at the temperature of 19 ℃ at a drawing speed of 1.22M/min;
the PVA film after washing enters a swelling tank at the temperature of 28 ℃ at the stretching speed of 1.79m/min for swelling;
the swelled PVA film enters a dyeing tank at 17 ℃ at a drawing speed of 2.99m/min, and is dyed by iodide ions;
the dyed PVA film enters a second washing tank at 30 ℃ at a stretching speed of 3.83m/min to be washed away with loose color;
the PVA film after washing away the flooding enters a stretching tank at 39 ℃ at the stretching speed of 4.98m/min for accelerated stretching;
the PVA film stretched in the first stretching groove enters a second stretching groove at the temperature of 48 ℃ at the stretching speed of 5.93m/min for accelerated stretching;
the stretched PVA film enters a 10 ℃ color complementing groove at a stretching speed of 7.32m/min for color adjustment;
and (3) cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 16 ℃, drying at 40 ℃, bonding with a Japanese Konica KC4CT1W Z-type TAC film to form a polarizer, drying the bonded polarizer in four sections of ovens at 50 ℃ in sequence, and cooling to obtain the finished product.
Example 2
The stretching process of the high-contrast light-leakage-preventing light polarizer comprises the following steps of:
selecting a PVA film with a Japanese synthetic M-6000 polymerization degree of 2400, and carrying out water washing through a first washing tank at 20 ℃ at a drawing speed of 1.30M/min;
the PVA film after washing enters a swelling tank with the temperature of 30 ℃ at the stretching speed of 1.71m/min for swelling;
the swelled PVA film enters a dyeing tank at the temperature of 19 ℃ at the drawing speed of 2.52m/min, and is dyed by iodide ions;
the dyed PVA film enters a second washing tank at 27 ℃ at a stretching speed of 3.68m/min to wash away loose color;
the PVA film after washing away the flooding enters a stretching tank at the temperature of 32 ℃ at the stretching speed of 4.05m/min for accelerated stretching;
the PVA film stretched in the first stretching groove enters a second stretching groove at the temperature of 45 ℃ at the stretching speed of 5.78m/min for accelerated stretching;
the stretched PVA film enters a color complementing groove at 12 ℃ at a stretching speed of 7.03m/min for color adjustment;
and (3) cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 17 ℃, drying at 40 ℃, bonding with a Japanese Konica KC4CT1W Z-type TAC film to form a polarizer, drying the bonded polarizer in four sections of ovens at 45 ℃ in sequence, and cooling to obtain the finished product.
Example 3
The stretching process of the high-contrast light-leakage-preventing light polarizer comprises the following steps of:
selecting a PVA film with a Japanese synthetic M-6000 polymerization degree of 2400, and carrying out water washing through a first washing tank at 18 ℃ at a drawing speed of 1.11M/min;
the PVA film after washing enters a swelling tank at 27 ℃ at a stretching speed of 1.60m/min for swelling;
the swelled PVA film enters a dyeing tank at 15 ℃ at a drawing speed of 2.68m/min, and is dyed by iodide ions;
the dyed PVA film enters a second washing tank at 25 ℃ at the stretching speed of 3.53m/min to wash away the loose color;
the PVA film after washing away the flooding enters a 35 ℃ stretching tank at a stretching speed of 4.32m/min for accelerated stretching;
the PVA film stretched in the first stretching groove enters a second stretching groove at the temperature of 40 ℃ at the stretching speed of 5.05m/min for accelerated stretching;
the stretched PVA film enters a color complementing groove at the temperature of 11 ℃ at the stretching speed of 7.48m/min for color adjustment;
and (3) cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 15 ℃, drying at 45 ℃, bonding with a Japanese Konica KC4UAW type TAC film to form a polarizer, drying the bonded polarizer in four sections of oven at 40 ℃ in sequence, and cooling to obtain the finished product.
Example 4
The stretching process of the high-contrast light-leakage-preventing light polarizer comprises the following steps of:
selecting a PVA film with a Japanese synthetic M-6000 polymerization degree of 2400, and carrying out water washing through a first washing tank at 17 ℃ at a drawing speed of 1.02M/min;
the PVA film after washing enters a swelling tank at 25 ℃ at a stretching speed of 1.52m/min for swelling;
the swelled PVA film enters a dyeing tank at 20 ℃ at a drawing speed of 2.83m/min, and is dyed by iodide ions;
the dyed PVA film enters a second washing tank at 29 ℃ at a stretching speed of 3.98m/min to wash away loose color;
the PVA film after washing away the flooding enters a stretching tank at 37 ℃ at a stretching speed of 4.77m/min for accelerated stretching;
the PVA film stretched in the first stretching groove enters a second stretching groove at the temperature of 43 ℃ at the stretching speed of 5.36m/min for accelerated stretching;
the stretched PVA film enters a color complementing groove at the temperature of 8 ℃ at the stretching speed of 7.18m/min for color adjustment;
and (3) cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 16 ℃, drying at 45 ℃, bonding with a Japanese Konica KC4UAW type TAC film to form a polarizer, drying the bonded polarizer in four sections of ovens at 50 ℃ in sequence, and cooling to obtain a finished product.
Comparative example 1
The stretching process of the polarizer comprises the following steps:
selecting a PVA film with KURAAY P type polymerization degree of 1700 in Japan, and performing water washing through a first washing tank at 15 ℃ at a drawing speed of 0.35 m/min;
the PVA film after washing enters a swelling tank with the temperature of 17 ℃ at the stretching speed of 0.38m/min for swelling;
the swelled PVA film enters a dyeing tank at 15 ℃ at a drawing speed of 0.43m/min, and is dyed by iodide ions;
the dyed PVA film enters a second washing tank at 15 ℃ at a stretching speed of 0.53m/min to wash away loose color;
the PVA film after washing away the flooding enters a 16 ℃ stretching tank at a stretching speed of 0.76m/min for accelerated stretching;
the PVA film stretched in the first stretching groove enters a second stretching groove at the temperature of 18 ℃ at the stretching speed of 0.96m/min for accelerated stretching;
the stretched PVA film enters a color complementing groove at 0 ℃ at a stretching speed of 1.26m/min for color adjustment;
and (3) cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 12 ℃, drying at 40 ℃, laminating with a Germany LOFO P905 type TAC film to form a polarizer, drying the laminated polarizer sequentially through four sections of oven at 40 ℃, and cooling to obtain a finished product.
Comparative example 2
The stretching process of the polarizer comprises the following steps:
selecting a PVA film with KURAAY P type polymerization degree of 1700 in Japan, and performing water washing through a first washing tank at the temperature of 17 ℃ at the drawing speed of 0.35 m/min;
the PVA film after washing enters a swelling tank with the temperature of 17 ℃ at the stretching speed of 0.42m/min for swelling;
the swelled PVA film enters a dyeing tank at 17 ℃ at a drawing speed of 0.48m/min, and is dyed by iodide ions;
the dyed PVA film enters a second washing tank at 17 ℃ at a stretching speed of 0.56m/min to wash away loose color;
the PVA film after washing away the flooding enters a stretching tank at the temperature of 18 ℃ at the stretching speed of 0.79m/min for accelerated stretching;
the PVA film stretched in the first stretching groove enters a second stretching groove at the temperature of 21 ℃ at the stretching speed of 0.99m/min for accelerated stretching;
the stretched PVA film enters a color complementing groove at 4 ℃ at a stretching speed of 1.38m/min for color adjustment;
and (3) cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 14 ℃, drying at 40 ℃, laminating with a Germany LOFO P905 type TAC film to form a polarizer, drying the laminated polarizer sequentially through four sections of oven at 40 ℃, and cooling to obtain a finished product.
Comparative example 3
The stretching process of the polarizer comprises the following steps:
selecting a PVA film with KURAAY P type polymerization degree of 1700 in Japan, and performing water washing through a first washing tank at the temperature of 17 ℃ at the drawing speed of 0.55 m/min;
the PVA film after washing enters a swelling tank at the temperature of 19 ℃ at the stretching speed of 0.72m/min for swelling;
the swelled PVA film enters a dyeing tank at 17 ℃ at a drawing speed of 0.98m/min, and is dyed by iodide ions;
the dyed PVA film enters a second washing tank at the temperature of 17 ℃ at the stretching speed of 1.26m/min to wash away the loose color;
the PVA film after washing away the flooding enters a stretching tank at the temperature of 22 ℃ at the stretching speed of 1.72m/min for accelerated stretching;
the PVA film stretched in the first stretching groove enters a second stretching groove at 25 ℃ at the stretching speed of 2.39m/min for accelerated stretching;
the stretched PVA film enters a color complementing groove at 4 ℃ at a stretching speed of 2.58m/min for color adjustment;
and (3) cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 14 ℃, drying at 40 ℃, laminating with a Germany LOFO P905 type TAC film to form a polarizer, drying the laminated polarizer sequentially through four sections of oven at 40 ℃, and cooling to obtain a finished product.
Comparative example 4
The stretching process of the polarizer comprises the following steps:
selecting a PVA film with Japanese KURAAY PS type polymerization degree of 2400, and performing water washing through a first washing tank at 17 ℃ at a drawing speed of 0.75 m/min;
the PVA film after washing enters a swelling tank at the temperature of 21 ℃ at the stretching speed of 0.92m/min for swelling;
the swelled PVA film enters a dyeing tank at 17 ℃ at a drawing speed of 1.25m/min, and is dyed by iodide ions;
the dyed PVA film enters a second washing tank at the temperature of 21 ℃ at the stretching speed of 1.56m/min to wash away the loose color;
the PVA film after washing and bleaching enters a stretching tank at the temperature of 28 ℃ at the stretching speed of 1.92m/min for accelerated stretching;
the PVA film stretched in the first stretching groove enters a second stretching groove with the temperature of 35 ℃ at the stretching speed of 2.79m/min for accelerated stretching;
the stretched PVA film enters a color complementing groove at the temperature of 6 ℃ at the stretching speed of 3.62m/min for color adjustment;
and (3) cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 14 ℃, drying at 40 ℃, laminating with a Germany LOFO P905 type TAC film to form a polarizer, drying the laminated polarizer sequentially through four sections of ovens at 45 ℃, and cooling to obtain a finished product.
Comparative example 5
The stretching process of the polarizer comprises the following steps:
selecting a PVA film with Japanese KURAAY PS type polymerization degree of 2400, and performing water washing through a first washing tank at 17 ℃ at a drawing speed of 0.82 m/min;
the PVA film after washing enters a swelling tank at 23 ℃ at a stretching speed of 0.99m/min for swelling;
the swelled PVA film enters a dyeing tank at 17 ℃ at a drawing speed of 1.45m/min, and is dyed by iodide ions;
the dyed PVA film enters a second washing tank at 26 ℃ at a stretching speed of 1.96m/min to wash away loose color;
the PVA film after washing away the flooding enters a stretching tank at 33 ℃ at the stretching speed of 2.82m/min for accelerated stretching;
the PVA film stretched in the first stretching groove enters a second stretching groove at 38 ℃ at a stretching speed of 3.63m/min for accelerated stretching;
the stretched PVA film enters a color complementing groove at the temperature of 6 ℃ at the stretching speed of 4.27m/min for color adjustment;
and (3) cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 14 ℃, drying at 40 ℃, bonding with a Japanese Konica KC4CT1W Z-type TAC film to form a polarizer, drying the bonded polarizer in four sections of ovens at 45 ℃ in sequence, and cooling to obtain the finished product.
TABLE 1 comparison of optical parameters and viewing angles of the polarizers in examples 1-4 and comparative examples 1-5
| Ys transmittance | Yc transmittance | Degree of Py polarization | Dichroic Rd | Extent of viewing angle | |
| Example 1 | 42.53% | 0.01% | 99.98% | 68.89 | 170 degree |
| Example 2 | 42.33% | 0.02% | 99.95% | 68.85 | 170 degree |
| Example 3 | 42.45% | 0.01% | 99.97% | 68.88 | 170 degree |
| Example 4 | 42.51% | 0.02% | 99.97% | 68.87 | 170 degree |
| Comparative example 1 | 45.86% | 11.53% | 95.03% | 34.56 | 123 degree |
| Comparative example 2 | 45.02% | 8.32% | 96.22% | 38.65 | 125 degree |
| Comparative example 3 | 44.56% | 4.72% | 98.32% | 46.75 | 126 degree |
| Comparative example 4 | 43.36% | 1.88% | 98.88% | 52.39 | 127 degree |
| Comparative example 5 | 43.01% | 0.58% | 99.68% | 56.65 | 153 degree |
As can be seen from table 1, examples 1 to 4 and comparative examples 1 to 5, the solution described in the present application is not used in the comparative example, the optical parameters and the width of the viewing angle of the polarizer produced by the solution are obviously not the same as those described in the present application, and the requirements of some electronic products on the polarizer in the prior art are not met, and as can be seen from comparative examples 1 to 3, although the working process is equivalent to that of the present application, the performance of the polarizer obtained by using different PVA films and TAC films and process parameters (working temperature and stretching speed) is greatly different, although the PVA film having the same polymerization degree as that of the PVA film used in the present application and the same process flow are also used in comparative example 4, the process parameters are different from that of the attached TAC film, and the performance of the obtained polarizer is far different; the polymerization degree of the PVA film used in comparative example 5 is the same as that used in the present application, the TAC film is also the TAC film disclosed in the present application, the process flow is equivalent to that of the present application, but the process parameters are different, and the performance of the finally obtained polarizer does not reach the technical effect described in the present application. As can be seen from table 1, the optical performance and the viewing angle of the polarizers produced in examples 1 to 4 can satisfy the requirements of the existing electronic products on the polarizers, and further, the applicant has performed the durability test on the polarizers described in examples 1 to 4, and the test results show that the durability of the polarizers exceeds the dry temperature: at 80-85 ℃ and 500H, high temperature and high humidity: index 65 ℃ X95%. X500H.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (8)
1. A stretching process of a high-contrast light-leakage-preventing light-deflecting sheet is characterized by comprising the following steps of:
s001, selecting a PVA film with the polymerization degree of 2400, and washing the PVA film with water through a first washing tank at the temperature of 17-20 ℃ at the stretching speed of 1-1.3 m/min;
s002, the washed PVA film enters a swelling tank at the temperature of 25-30 ℃ at a stretching speed of 1.5-1.8 m/min for swelling;
s003, enabling the swelled PVA film to enter a dyeing tank at 15-20 ℃ at a drawing speed of 2.5-3 m/min, and dyeing the PVA film by iodide ions;
s004, the dyed PVA film enters a second washing tank at 25-30 ℃ at a stretching speed of 3.5-4 m/min to wash away loose color;
s005, feeding the PVA film with the color floated after washing away into a stretching tank at the temperature of 30-40 ℃ at the stretching speed of 4-5 m/min for accelerated stretching;
s006, stretching the PVA film stretched in the first groove, and then entering a second stretching groove at 40-50 ℃ at a stretching speed of 5-6 m/min for accelerated stretching;
s007, feeding the stretched PVA film into a color complementing groove at the temperature of 8-12 ℃ at the stretching speed of 7-7.5 m/min for color adjustment;
s008, cleaning the film surface of the PVA film after color compensation in a third cleaning tank at 15-17 ℃, drying at 40-50 ℃, bonding with a TAC film to form a polarizer, drying the bonded polarizer sequentially through four sections of drying ovens at 40-50 ℃, and cooling to obtain a finished product;
the PVA film comprises a PVA film with a polymerization degree of 2400 of Japanese synthetic M-6000; the TAC films include Japanese Konica KC4CT1W Z-type TAC films and Japanese Konica KC4 UAW-type TAC films;
the dichroism of the polaroid reaches more than 68 percent, and the polarization degree is higher than 99.9 percent.
2. The process of claim 1, wherein in step S001, the PVA film is washed with water at a speed of 1.22m/min through a first washing bath at 19 ℃.
3. The process of claim 1, wherein in step S002, the washed PVA film is swelled in a swelling tank at 28 ℃ at a stretching speed of 1.79 m/min.
4. The process of claim 1, wherein in step S003, the swollen PVA film is introduced into a 17 ℃ dyeing bath at a drawing speed of 2.99m/min, and the PVA film is dyed by iodide ions.
5. The process of claim 1, wherein in step S004, the dyed PVA film is fed into a second washing bath at 30 ℃ at a stretching speed of 3.83m/min to wash off the floating color.
6. The process of claim 1, wherein the PVA film after washing away the color bloom enters a stretching tank at 39 ℃ at a stretching speed of 4.98m/min for accelerated stretching; then enters a second stretching groove with the temperature of 48 ℃ at the stretching speed of 5.93m/min for accelerated stretching.
7. A process of stretching a high contrast light leakage preventive polarizer according to claim 1, wherein in step S007, the stretched PVA film enters a 10 ℃ color correction cell at a stretching speed of 7.32m/min for color adjustment.
8. The process of claim 1, wherein in step S008, the PVA film after color compensation is subjected to cleaning in a third cleaning tank at 16 ℃, then dried at 40 ℃, and then bonded with a TAC film to form a polarizer, and the polarizer is dried sequentially through four sections of ovens at 50 ℃ and cooled to obtain a finished product.
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| CN109782478B (en) * | 2019-03-21 | 2021-12-24 | 南京汉旗新材料股份有限公司 | TN/STN polarizing film hue control method |
| CN115097561B (en) * | 2022-06-17 | 2024-01-09 | 佛山纬达光电材料股份有限公司 | High-temperature-resistant iodine polarizer and production process thereof |
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| KR20000010959A (en) * | 1997-03-19 | 2000-02-25 | 나카무라 하사오 | Polarization film |
| JP2004272078A (en) * | 2003-03-11 | 2004-09-30 | Fuji Photo Film Co Ltd | Method and facility for continuously manufacturing polarizing plate |
| CN101486268A (en) * | 2008-01-14 | 2009-07-22 | 达信科技股份有限公司 | Method for manufacturing polarizing film and polarizing film manufactured thereby |
| JP4691205B1 (en) * | 2010-09-03 | 2011-06-01 | 日東電工株式会社 | Method for producing optical film laminate including thin high-performance polarizing film |
| CN102243332A (en) * | 2011-07-01 | 2011-11-16 | 来奇偏光科技（厦门）有限公司 | Polarizing film stretcher |
| CN103278878A (en) * | 2013-06-27 | 2013-09-04 | 佛山纬达光电材料有限公司 | Processing technology of polarizer |
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