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A kind of stripping method of polyvinyl alcohol optical film

A polyvinyl alcohol-based, optical film technology, applied in chemical instruments and methods, lamination, lamination auxiliary operations, etc., can solve problems such as affecting the quality of the film, difficult to peel off, etc., to achieve good optical performance, fewer defects, The effect of prolonging the use time

Active Publication Date: 2019-12-13
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The way and amount of surfactant added are very important. When the amount added is large, the surfactant will dissolve and form agglomerates during the drying process or subsequent processing of the film, which will affect the quality of the film. When the amount added is small When, it is difficult to achieve the effect of peeling

Method used

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  • A kind of stripping method of polyvinyl alcohol optical film
  • A kind of stripping method of polyvinyl alcohol optical film
  • A kind of stripping method of polyvinyl alcohol optical film

Examples

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Embodiment 1

[0019] The invention discloses a peeling method of a polyvinyl alcohol-based optical film, which mainly includes the following steps:

[0020] (1) Each roll of optical film is sprayed with a release agent along the length direction of the cast roll to the surface of the cast roll within 5 seconds before the initial casting, and the side of the cast roll is provided with a device for spraying the release agent spray device. The spray concentration of the release agent is 12ppm.

[0021] (2) Extrude the film-making stock solution at 82°C onto a casting roll to cast a film, the temperature of the casting roll is 72°C, the optical film is continuously peeled off from the casting roll, and the casting roll rotates The linear speed is 10m / min.

[0022] After the optical film is peeled off, the 1-2m length of the front end of the film is cut off, and then the subsequent drying and heat treatment process is introduced.

[0023] Casting rolls are used to cast the film. The water co...

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Abstract

The invention discloses a stripping method of a polyvinyl alcohol-based optical film. The stripping method comprises the following steps: (1) spraying a demoulding agent once from the length direction of a casting roll to the surface of the casting roll; (2) extruding a film making stock solution with the temperature of 80-95 DEG C onto the casting roll, casting for film making, and continuously stripping the optical film from the casting roll, wherein the temperature of the casting roll is 70-95 DEG C and the rotating line speed of the casting roll is 3-30m / min. By the stripping method, the surface finish of the prepared optical film is good, a subsequent dissolved substance is less, the using time of a swelling solution can be prolonged, and a finally prepared polaroid has few color spots and good optical performance.

Description

technical field [0001] The present invention relates to a mechanical or chemical method for removing a layer or a part of a layer, in particular to a peeling method of a polyvinyl alcohol-based optical film. Background technique [0002] At present, the production method of polyvinyl alcohol-based optical film is to coat (or cast) the film-making solution containing polyvinyl alcohol on a support such as a steel belt or a metal roller, dry it, peel it off, and then pass it through hot air or multiple metal strips. The roller is heat-treated and then wound up. [0003] In order to make the production process smooth, especially the initial film that is coated (or cast) on a support such as a steel belt or a metal roller can be peeled off without damaging the surface of the film, often on the surface of the polyvinyl alcohol optical film Surfactants are added to the stock solution. The way and amount of surfactant added are very important. When the amount added is large, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B38/10
CPCB32B38/10
Inventor 吕惠霞赵寰黎园吴辉江朱代才
Owner CHINA PETROCHEMICAL CORP
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