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Solution casting apparatus and method

一种溶液、设备的技术，应用在溶液流延设备领域，能够解决干燥效率降低、湿膜破裂、膜表面劣化等问题，达到抑制干扰和、防止蒸发的效果

Inactive Publication Date: 2008-10-01
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the thickness of the side end of the casting bead increases, its drying efficiency decreases due to the thickness, and the speed of gelation by cooling becomes slower
Therefore, the gel strength corresponding to the peeling cannot be obtained, and in some cases, the residue of the casting film that has not been peeled remains on the casting drum
In this case, the surface of the film deteriorates, and cracking of the wet film occurs

Method used

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  • Solution casting apparatus and method
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  • Solution casting apparatus and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 11

[0093] As shown in Table 1 below, in Example 1, when the film formation was performed under the above-mentioned conditions, the gap CLs (see FIG. 5) was adjusted so that the blowing wind speed of dry air and the like from the gap CLs of the side labyrinth seal portion 75 Vs is 5 m / sec, and the gap CL2 is adjusted so that the blowing wind speed V2 of dry air or the like from the gap CL2 of the second labyrinth seal portion 62 toward the casting bead 12a is 3 m / sec. In addition, the gap CL1 is adjusted so that the blowing wind speed V1 of dry air and the like from the first labyrinth seal portion 60 is at most 5 m / sec, and the gap CL3 is adjusted so that the blowing wind speed V3 of the dry air and the like from the third labyrinth seal portion 64 is At most 5m / sec.

[0094] The blowing wind speed was measured by Anemomaster (manufactured by KANOMAX Japan Inc.).

[0095] In Examples 2 to 7, basically, the films were formed under the same conditions as in Example 1. However, in Embod...

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Abstract

A dope containing a polymer and a solvent is discharged as a casting bead from a casting die onto a running (rotating) casting drum to form a casting film. First and second partition plates are provided upstream and downstream from the casting die, respectively. A third partition plate is provided upstream of a peeling roller disposed upstream of the casting die in the rotational direction of thecasting drum. Dry air is supplied from a dry air circulator to a drying chamber defined by the second and third partition plates. A side labyrinth seal portion is provided close to the side end surface of the casting drum. A labyrinth seal portion of each of the first to third partition plates and the side labyrinth seal portion prevent dry air from entering the casting chamber even when flow volume of dry air is increased for high-speed casting.

Description

Technical field [0001] The invention relates to a solution casting equipment and method for preparing polymer membranes. Background technique [0002] The polymer film (hereinafter referred to as a film) has advantages such as excellent light transmittance and flexibility, and is easy to become lighter and thinner. Therefore, the film is widely used as an optical functional film. In particular, in addition to the above advantages, cellulose esters using cellulose acylate and the like also have advantages such as toughness and low birefringence. Therefore, the cellulose ester film is used as a photographic photosensitive film, a protective film for a polarizing filter and an optical compensation film as a component of a liquid crystal display (LCD) whose market has been expanding recently. [0003] As a production method of the above-mentioned film, a solution casting method (as disclosed in, for example, Japanese Patent Laid-Open Publication No. 62-115035) is generally used. Comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C41/26B29C41/34B29C41/46F26B13/00F26B3/00B29L7/00
CPCB29C41/26B29K2001/00
Inventor 加藤盛孝
Owner FUJIFILM CORP
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