Method and device for making film by casting mould

A solution-based film-making and mold-making technology, which is applied in the direction of coating, etc., can solve the problems of cast coatings being easily affected by the outside world, production efficiency reduction, uneven thickness, etc., achieve excellent optical properties and physical properties, improve production efficiency, and durability excellent effect

Inactive Publication Date: 2007-08-22
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such impurities are generated, the support has to be cleaned, resulting in a significant reduction in production efficiency
Furthermore, when the flow rate of the solvent fluctuates during film production, the cast coating is easily affected by the outside world.
Therefore, the paint that continues to flow on the support may vibrate or expand and contract, and the thickness of the formed film becomes uneven, which becomes the cause of product defects.

Method used

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  • Method and device for making film by casting mould
  • Method and device for making film by casting mould
  • Method and device for making film by casting mould

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] The monolayer continuous flow was performed under the following conditions. The conditions for supplying the solvent to the edge of the die cut are as follows.

[0119] 1) The flow rate is 0.2ml / min

[0120] 2) The inner diameter of the liquid supply nozzle is φ0.1 mm, the outer diameter is φ0.3 mm, and the discharge speed of the liquid supply nozzle is 42.5 cm / sec.

[0121] 3) The viscosity of the solvent is 0.5cp

[0122] 4) The surface tension of the solvent is 26dyn / cm

[0123] 5) The contact angle between the solvent and the front end of the liquid supply nozzle and the front end of the mold cutout is 30 degrees

[0124] 6) The distance L1 between the end of the continuous flowing paint and the front end of the liquid supply nozzle is 1.0mm

[0125] 7) The end of the flowing paint continues to be supplied from the die cutout along the horizontal direction

[0126] 8) Solvent composition Methylene chloride 60% by weight

[0127] Methanol 40% by weight

[0128...

Embodiment 2

[0131] The co-continuation flow is carried out under the following conditions. Conditions for supplying the solvent to the upper edge of the die cut are as follows.

[0132] 1) The flow rate is 0.2ml / min

[0133] 2) The inner diameter of the liquid supply nozzle is φ0.1mm, the outer diameter is φ0.3mm, and the discharge speed of the liquid supply nozzle is 42.5cm / s

[0134] 3) The viscosity of the solvent is 0.5cp

[0135] 4) The surface tension of the solvent is 26dyn / cm

[0136] 5) The contact angle between the solvent and the front end of the liquid supply nozzle and the front end of the mold cutout is 30 degrees

[0137] 6) The distance L1 between the end of the continuous flowing paint and the front end of the liquid supply nozzle is 1.0mm

[0138] 7) The end of the flowing paint continues to be supplied in the horizontal direction from the die cutout

[0139] 8) Solvent composition Methylene chloride 60% by weight

[0140] Methanol 40% by weight

[0141] 9) Nozzle...

Embodiment 3

[0144] The continuous flow of a single layer was carried out by the following paint formulation, and the conditions for supplying the solvent to the edge of the die cut were as follows.

[0145] 100 parts by weight of cellulose triacetate

[0146] 10 parts by weight of triphenyl phosphate

[0147] 5 parts by weight of biphenyl diphenyl phosphate

[0148] 315 parts by weight of methyl acetate

[0149] Methanol 60 parts by weight

[0150] 10 parts by weight of n-butanol

[0151] Swell the cellulose triacetate with a solvent for 30 minutes, then send the cellulose triethyl acetate solution out with a screw extruder, pass through the cooling zone, and keep at -70°C for 3 minutes. Cooling was performed using a refrigerant (Novac FC-77 or HFE-7100 manufactured by 3M Corporation) cooled to -80° C. with a refrigerator. The solution obtained by cooling was put into a stainless steel container, and stirred at 50° C. for 2 hours. Filtration was performed with filter paper (manufact...

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Abstract

A casting die is provided with a liquid supply nozzle and a space L1 between the fore end of the liquid supply nozzle and a casting dope is set to be 0.5-3.0 mm. An angle theta of the fore end of the liquid supply nozzle formed to the casting dope is made 10 deg.-90 deg. A solvent is made to flow from the solution supply nozzle at a flow rate of 0.05-0.5 ml / min and with the flow variation percentage thereof set at plusmn 10% in the range of 0.005-10 sec. Skinning is prevented by injection of the solvent in a minute quantity. A film cast from the casting die is suitable for a polarizing plate protecting film and can be used for a liquid crystal display device and the like.

Description

technical field [0001] The present invention relates to a casting mold for solution film making which prevents peeling at both ends of the die cut, a solution film making method and device using the casting mold, and particularly relates to optical materials suitable for liquid crystal display, such as polarizer protective film and polarizer A film-making method and apparatus for producing a plate and a photofunctional film. Background technique [0002] Generally, membranes (thin films) such as cellulose acetate, polycarbonate, and celluloid are manufactured using a solution membrane-forming method. In this solution film formation, a casting die 201 shown in FIG. 12 was used. In most cases, when the polymer solution (hereinafter referred to as dope) is continuously flowed out from the casting die 201 to form the casting dope 210, peeling 217 occurs at both ends of the die cutout 216 due to drying. This peeling grows into icicles at both ends of the die cutout 216 , disrup...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C41/12
Inventor 片井幸祐
Owner FUJIFILM CORP
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