US20060096045A1 - Method for dyeing polarizers - Google Patents

Method for dyeing polarizers Download PDF

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Publication number
US20060096045A1
US20060096045A1 US11/006,597 US659704A US2006096045A1 US 20060096045 A1 US20060096045 A1 US 20060096045A1 US 659704 A US659704 A US 659704A US 2006096045 A1 US2006096045 A1 US 2006096045A1
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United States
Prior art keywords
dyeing
period
polarizers
agent
polarizing substrate
Prior art date
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Abandoned
Application number
US11/006,597
Inventor
Jui-Chi Wu
Shih-Ming Chen
Yao-Chung Cheng
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Optimax Technology Corp
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Optimax Technology Corp
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Assigned to OPTIMAX TECHNOLOGY CORPORAITON reassignment OPTIMAX TECHNOLOGY CORPORAITON ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHENG, YAO-CHUNG, WU, JUI-CHI, CHEN, SHIH-MING
Publication of US20060096045A1 publication Critical patent/US20060096045A1/en
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/0004—General aspects of dyeing
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G27/00—Floor fabrics; Fastenings therefor
    • A47G27/02—Carpets; Stair runners; Bedside rugs; Foot mats
    • A47G27/0243—Features of decorative rugs or carpets
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61H—PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY
    • A61H39/00—Devices for locating or stimulating specific reflex points of the body for physical therapy, e.g. acupuncture
    • A61H39/04—Devices for pressing such points, e.g. Shiatsu or Acupressure
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/34—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using natural dyestuffs
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
    • D06P1/673—Inorganic compounds
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid

Definitions

  • Taiwan Application Serial Number 93134019 filed on Nov. 8, 2004, the disclosure of which is hereby incorporated by reference herein in its entirety.
  • the present invention relates to a method for manufacturing polarizers. More particularly, the present invention relates to a method for dyeing polarizers.
  • LCD liquid crystal displays
  • CTR cathode ray tube
  • Polarizers are main components of a liquid crystal display. Traditionally, a polarizing substrate is dyed, extended and corrected first, and then is adhered onto a protection film to form a polarizer.
  • the polarizing substrate is made of polyvinyl alcohol (PVA) molecules, which are distributed irregularly at any angle in the beginning. After extending, PVA molecules are gradually turned toward the extending direction, and iodine ions adhered on the PAV molecules are also arranged in the extending direction.
  • PVA polyvinyl alcohol
  • the polarizer can absorb an amount of light parallel to the extending direction and only allow an amount of light perpendicular to the extending direction to pass through.
  • FIG. 1 is a schematic view of a conventional dyeing apparatus for polarizers.
  • a polarizing substrate 110 is dyed as mentioned above in a dyeing tank 102 .
  • a common dyeing agent is an iodine solution 112 , and the iodine ions thereof are diffused into the polarizing substrate 110 by soaking the polarizing substrate 110 in the iodine solution 112 .
  • the rolling speed of polarizers while manufacturing i.e. the machine speed
  • the period of the polarizing substrate 110 soaking in the iodine solution 112 is short, thus causing insufficient dyeing.
  • the prior art generally enlarges the size of the dyeing tank 102 or increases the concentration of the iodine solution 112 to obtain better dyeing results.
  • a larger dyeing tank or a higher concentrated dyeing agent requires a greater amount of chemicals and increases manufacturing cost.
  • the dyeing result of a higher concentrated dyeing agent is hard to control, easily causing uneven dyeing, which decreases the quality and affects the optical performance of polarizers.
  • a method for dyeing polarizers is provided.
  • a polarizing substrate is placed into a dyeing tank for dyeing.
  • a concentration of a dyeing agent in the dyeing tank is less than 800 ppm, and a dyeing period is greater than 200 seconds, so as to improve the dyeing of the polarizing substrate by lengthening the dyeing period and lowering the dyeing agent concentration.
  • a dyeing path of the polarizing substrate is extended to increase the dyeing period by use of a plurality of rollers configured in the dyeing tank or by increasing a size of the dyeing tank.
  • the dyeing agent comprises iodine
  • a material of the polarizing substrate is polyvinyl alcohol.
  • the present invention increases the dyeing period and decreases the concentration of the dyeing agent of the dyeing process and thus prevents uneven dyeing and improves the dyeing quality. Moreover, decreasing the dyeing agent concentration also reduces the amount of chemicals used and thus decreases manufacturing cost.
  • FIG. 1 is a schematic view of a conventional dyeing apparatus for polarizers
  • FIG. 2 is a schematic view of one preferred embodiment of the present invention
  • the present invention provides a method for dyeing polarizers, which improves the dyeing by using a long dyeing period and a dyeing agent with low concentration.
  • the features of the present invention comprise controlling the dyeing period and the concentration of the dyeing agent using specific values. More particularly, the dyeing period is greater than 200 seconds and the concentration of the dyeing agent is less than 800 ppm, so as to obtain polarizers with good optical quality.
  • a dyeing path in the dyeing tank can be extended to increase the dyeing period.
  • FIG. 2 is a schematic view of one preferred embodiment of the present invention. As illustrated in FIG. 2 , the preferred embodiment adds rollers 202 in the dyeing tank 102 .
  • the dyeing path in the dyeing tank 102 is extended to increase the dyeing period of the polarizing substrate 110 , such as a PVA substrate, soaked in the iodine solution 112 . Because the dyeing period is increased to be greater than 200 seconds, the concentration of the dyeing agent can be decreased to be lower than 800 ppm.
  • the monomer transmittance of the polarizers can be over 43%; and the degree of polarization of polarizers can be greater than 99.90% when the dyeing temperature is between about 30° C. and 50° C., the dyeing time is greater than 200 seconds, and the concentration of the iodine solution is less than 800 ppm.
  • the dyeing uniformity of the polarizer of the preferred embodiment is superior to the polarizer manufactured at the same dyeing temperature with a dyeing period of 80 seconds and the concentration of the iodine solution greater than 1200 ppm. Therefore, the preferred embodiment reduces the amount of chemicals, decreases the manufacturing cost and prevents uneven dyeing.
  • the dyeing agent used here is an iodine solution diluted with other solvents and additives.
  • the iodine stock solutions which are not diluted with other solvents and additives, for different dyeing paths are listed in Table 1 for easy and clear comparison. Because the size of the dyeing tank 202 and the volume of the iodine solution 112 therein are both fixed, the changes of the iodine stock solutions can be regarded as the changes of the concentrations of the iodine solutions. As indicated in Table 1, the preferred embodiment can certainly reduce the amount of dyeing agent used for dyeing by increasing the dyeing period, without affecting the desired polarizer hue.
  • the dyeing period can also be increased by changing the size and configuration of the rollers, increasing the size of the dyeing tank, and applying dyeing delay agents or other dyeing period extending methods known in prior art, according to other preferred embodiments.
  • the present invention increases the dyeing period and decreases the concentration of the dyeing agent of the dyeing process, and thus prevents uneven dyeing and improves the dyeing quality. Moreover, decreasing the dyeing agent concentration also reduces the amount of chemicals used and thus decreases manufacturing cost.

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  • Textile Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Rehabilitation Therapy (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Pain & Pain Management (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • General Health & Medical Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Epidemiology (AREA)
  • Polarising Elements (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Liquid Crystal (AREA)

Abstract

A polarizing substrate is placed into a dyeing tank for dyeing. A concentration of a dyeing agent in the dyeing tank is less than 800 ppm, and a dyeing period is greater than 200 seconds, so as to improve the dyeing of the polarizing substrate by lengthening the dyeing period and reducing the dyeing agent concentration.

Description

    RELATED APPLICATIONS
  • The present application is based on, and claims priority from, Taiwan Application Serial Number 93134019, filed on Nov. 8, 2004, the disclosure of which is hereby incorporated by reference herein in its entirety.
    • BACKGROUND
  • 1. Field of Invention
  • The present invention relates to a method for manufacturing polarizers. More particularly, the present invention relates to a method for dyeing polarizers.
  • 2. Description of Related Art
  • Liquid crystal displays (LCD) have many advantages over conventional types of displays including having high display quality, having small volume, being lightweight, and having low driving voltage and low power consumption. Hence, LCDs are widely used in small portable televisions, mobile telephones, video recording units, notebook computers, desktop monitors, projector televisions and so on, and they have gradually replaced the conventional cathode ray tube (CRT) as a mainstream display unit.
  • Polarizers are main components of a liquid crystal display. Traditionally, a polarizing substrate is dyed, extended and corrected first, and then is adhered onto a protection film to form a polarizer. The polarizing substrate is made of polyvinyl alcohol (PVA) molecules, which are distributed irregularly at any angle in the beginning. After extending, PVA molecules are gradually turned toward the extending direction, and iodine ions adhered on the PAV molecules are also arranged in the extending direction. Thus, the polarizer can absorb an amount of light parallel to the extending direction and only allow an amount of light perpendicular to the extending direction to pass through.
  • FIG. 1 is a schematic view of a conventional dyeing apparatus for polarizers. As illustrated in FIG. 1, a polarizing substrate 110 is dyed as mentioned above in a dyeing tank 102. A common dyeing agent is an iodine solution 112, and the iodine ions thereof are diffused into the polarizing substrate 110 by soaking the polarizing substrate 110 in the iodine solution 112. As production capacity gradually increases, the rolling speed of polarizers while manufacturing, i.e. the machine speed, also becomes faster. When the machine speed is fast, the period of the polarizing substrate 110 soaking in the iodine solution 112 is short, thus causing insufficient dyeing.
  • Therefore, the prior art generally enlarges the size of the dyeing tank 102 or increases the concentration of the iodine solution 112 to obtain better dyeing results. However, a larger dyeing tank or a higher concentrated dyeing agent requires a greater amount of chemicals and increases manufacturing cost. Moreover, the dyeing result of a higher concentrated dyeing agent is hard to control, easily causing uneven dyeing, which decreases the quality and affects the optical performance of polarizers.
    • SUMMARY
  • It is therefore an aspect of the present invention to provide a method for dyeing polarizers, of which the dyeing period is increased and the concentration of the dyeing agent is decreased, to reduce manufacturing cost and enhance polarizer quality, especially for a polarizer manufacturing process with high machine speed.
  • In accordance with the foregoing and other aspects of the present invention, a method for dyeing polarizers is provided. A polarizing substrate is placed into a dyeing tank for dyeing. A concentration of a dyeing agent in the dyeing tank is less than 800 ppm, and a dyeing period is greater than 200 seconds, so as to improve the dyeing of the polarizing substrate by lengthening the dyeing period and lowering the dyeing agent concentration.
  • According to one preferred embodiment of the present invention, a dyeing path of the polarizing substrate is extended to increase the dyeing period by use of a plurality of rollers configured in the dyeing tank or by increasing a size of the dyeing tank. The dyeing agent comprises iodine, and a material of the polarizing substrate is polyvinyl alcohol.
  • The present invention increases the dyeing period and decreases the concentration of the dyeing agent of the dyeing process and thus prevents uneven dyeing and improves the dyeing quality. Moreover, decreasing the dyeing agent concentration also reduces the amount of chemicals used and thus decreases manufacturing cost.
  • It is to be understood that both the foregoing general description and the following detailed description are examples and are intended to provide further explanation of the invention as claimed.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • These and other features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings where:
  • FIG. 1 is a schematic view of a conventional dyeing apparatus for polarizers; and
  • FIG. 2 is a schematic view of one preferred embodiment of the present invention
    • DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
  • The present invention provides a method for dyeing polarizers, which improves the dyeing by using a long dyeing period and a dyeing agent with low concentration. The features of the present invention comprise controlling the dyeing period and the concentration of the dyeing agent using specific values. More particularly, the dyeing period is greater than 200 seconds and the concentration of the dyeing agent is less than 800 ppm, so as to obtain polarizers with good optical quality.
  • According to a preferred embodiment of the present invention, a dyeing path in the dyeing tank can be extended to increase the dyeing period. FIG. 2 is a schematic view of one preferred embodiment of the present invention. As illustrated in FIG. 2, the preferred embodiment adds rollers 202 in the dyeing tank 102. The dyeing path in the dyeing tank 102 is extended to increase the dyeing period of the polarizing substrate 110, such as a PVA substrate, soaked in the iodine solution 112. Because the dyeing period is increased to be greater than 200 seconds, the concentration of the dyeing agent can be decreased to be lower than 800 ppm.
  • In the preferred embodiment, the monomer transmittance of the polarizers can be over 43%; and the degree of polarization of polarizers can be greater than 99.90% when the dyeing temperature is between about 30° C. and 50° C., the dyeing time is greater than 200 seconds, and the concentration of the iodine solution is less than 800 ppm. The dyeing uniformity of the polarizer of the preferred embodiment is superior to the polarizer manufactured at the same dyeing temperature with a dyeing period of 80 seconds and the concentration of the iodine solution greater than 1200 ppm. Therefore, the preferred embodiment reduces the amount of chemicals, decreases the manufacturing cost and prevents uneven dyeing.
  • An experiment is used to prove that the preferred embodiment reduces the amount of chemicals by extending the dyeing path. As in the foregoing embodiment, the dyeing path is extended by rollers 202 to increase the dyeing period of the polarizing substrate 110. It is noted that, several dyeing paths with different lengths are provided by changing the number of the rollers 202 in this experiment. However, the hues of the obtained polarizers are the same, and thus the amount of the dyeing agent used for different dyeing paths are observed. Table 1 lists path lengths, dyeing periods and amounts of dyeing agents for different dyeing paths, which are formed by different numbers of rollers, all combinations of which obtain polarizers with the same hue.
    TABLE 1
    A comparison of different dyeing paths
    toobtain polarizers with the same hue.
    Roller number
    5 3 2 1
    Path length (mm) 210 140 130 80
    Dyeing period (sec) 225 150 140 80
    Iodine stock solution (L) 3 3.6 3.6 4.9
  • The dyeing agent used here is an iodine solution diluted with other solvents and additives. For clarity, the iodine stock solutions, which are not diluted with other solvents and additives, for different dyeing paths are listed in Table 1 for easy and clear comparison. Because the size of the dyeing tank 202 and the volume of the iodine solution 112 therein are both fixed, the changes of the iodine stock solutions can be regarded as the changes of the concentrations of the iodine solutions. As indicated in Table 1, the preferred embodiment can certainly reduce the amount of dyeing agent used for dyeing by increasing the dyeing period, without affecting the desired polarizer hue.
  • In addition, besides increasing the number of rollers to extend the dyeing path in order to increase the dyeing period as illustrated in the foregoing embodiment, the dyeing period can also be increased by changing the size and configuration of the rollers, increasing the size of the dyeing tank, and applying dyeing delay agents or other dyeing period extending methods known in prior art, according to other preferred embodiments.
  • The present invention increases the dyeing period and decreases the concentration of the dyeing agent of the dyeing process, and thus prevents uneven dyeing and improves the dyeing quality. Moreover, decreasing the dyeing agent concentration also reduces the amount of chemicals used and thus decreases manufacturing cost.
  • It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.

Claims (6)

1. A method for dyeing a polarizing substrate, the method comprising:
dyeing a polarizing substrate in a dyeing tank with a dyeing agent, wherein a concentration of the dyeing agent is less than 800 ppm, and a dyeing period is greater than 200 seconds, so as to improve the dyeing of the polarizing substrate by the long dyeing period and the dyeing agent with the low concentration.
2. The method of claim 1, wherein the method further comprises:
extending a dyeing path of the polarizing substrate in the dyeing tank to increase the dyeing period.
3. The method of claim 2, wherein the dyeing path extending comprises:
extending the dyeing path by a plurality of rollers configured in the dyeing tank.
4. The method of claim 2, wherein the dyeing path extending comprises:
extending the dyeing path by increasing a size of the dyeing tank.
5. The method of claim 1, wherein the dyeing agent comprises iodine.
6. The method of claim 1, wherein a material of the polarizing substrate is polyvinyl alcohol.
US11/006,597 2004-11-08 2004-12-08 Method for dyeing polarizers Abandoned US20060096045A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW93134019 2004-11-08
TW093134019A TWI247134B (en) 2004-11-08 2004-11-08 A method for improving dyeing of polarizing films

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JP (1) JP2006133715A (en)
KR (1) KR100646927B1 (en)
TW (1) TWI247134B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170014475A (en) 2015-07-30 2017-02-08 동우 화인켐 주식회사 Apparatus for manufacturing optical film

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5700296A (en) * 1995-02-20 1997-12-23 Sumitomo Chemical Company, Limited Azo compound and a polarizing film containing the same
US6235064B1 (en) * 1993-05-28 2001-05-22 Sumitomo Chemical Company, Limited Dye containing polarizing film

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6235064B1 (en) * 1993-05-28 2001-05-22 Sumitomo Chemical Company, Limited Dye containing polarizing film
US5700296A (en) * 1995-02-20 1997-12-23 Sumitomo Chemical Company, Limited Azo compound and a polarizing film containing the same

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TW200513671A (en) 2005-04-16
KR20060041143A (en) 2006-05-11
TWI247134B (en) 2006-01-11
JP2006133715A (en) 2006-05-25
KR100646927B1 (en) 2006-11-23

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Owner name: OPTIMAX TECHNOLOGY CORPORAITON, TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WU, JUI-CHI;CHEN, SHIH-MING;CHENG, YAO-CHUNG;REEL/FRAME:015474/0187;SIGNING DATES FROM 20041115 TO 20041117

STCB Information on status: application discontinuation

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