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Casting device and solution film forming method

A technology of traveling direction and support body, which is applied in the field of casting equipment and solution film formation, can solve the problem of difficult channel control of the decompression chamber, and achieve the effect of uniform thickness

Active Publication Date: 2020-10-09
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the actual situation is that the thinner the film thickness becomes and the higher the manufacturing speed is, the more difficult it is to control the channel using the decompression chamber.

Method used

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  • Casting device and solution film forming method
  • Casting device and solution film forming method
  • Casting device and solution film forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 ~ Embodiment 3

[0065] use figure 1 The solution film forming equipment 10 shown was used to produce the film 11, and it was used as Example 1. Replace the extended configuration part 41 of the solution film forming equipment 10 with Figure 4 The extension configuration member 61 is shown to manufacture the film 11, and it is used as Example 2. Replace the extended configuration part 41 of the solution film forming equipment 10 with Image 6 The shown extension configuration part 81 was used to manufacture the film 11, and was used as Example 3. As described above, the thickness of the produced film 11 was 30 μm, and the traveling speed of the casting belt 22 and the production speed of the film 11 were 60 m / min. In the manufacture of the film 11 , the mechanical vibration of the mold 19 was measured using a vibration meter unit UV15 manufactured by RION Co., Ltd. . The measurement results were evaluated as vibration levels using an FFT (Fast Fourier Transform) analyzer CF7200 manufactur...

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Abstract

The present invention provides a casting apparatus for manufacturing an optical film having a more uniform thickness and a solution film forming method. The casting apparatus has a traveling casting belt, a die, a bellows, and an extension configuration part. The die flows out of the dopant from the slit-like outlet toward the casting belt. The bellows is arranged at a position more upstream than the die in the traveling direction X of the casting belt. The bellows and the die are opposed to each other via a gap, and shield the accompanying wind associated with the movement of the casting belt. The extension configuration member protrudes from the end portion of the bellows opposite to the die at the side of the casting belt. The extension configuration member extends along the longitudinal direction of the outlet.

Description

technical field [0001] The invention relates to a casting device and a method for forming a film from a solution. Background technique [0002] A solution film-forming method is known as a method for producing optical films such as protective films of polarizing plates. The solution film forming method is a method of producing a film in which a dopant obtained by dissolving a polymer in a solvent flows out from a mold toward a traveling support, thereby forming a cast film on the support, and casting the cast film from the support Peel off and dry. The outlet of the mold from which the dopant is discharged is formed in a slit shape, whereby a thin film of dope called a bead is formed over the support from the outlet of the mold. [0003] In the case where track vibration or the like is unstable, thickness unevenness, that is, thickness unevenness, occurs in the obtained film. A so-called accompanying wind that flows along with the travel of the support body is known as a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C41/28B29C41/34B29C41/44B29L7/00B29C48/305
CPCB29C41/28B29C41/34B29C41/44B29L2007/00
Inventor 稻田淳史
Owner FUJIFILM CORP