Solution casting method of film

A solution and casting liquid technology, applied in the field of film manufacturing, can solve the problems of film surface deterioration, difficulty, uneven film thickness, etc., and achieve the effects of helping air flow control, reducing trouble, and preventing unevenness
CN101137482AActive Publication Date: 2008-03-05FUJIFILM CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FUJIFILM CORP
Publication Date
2008-03-05

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Abstract

Dope including a polymer and a solvent is discharged from a casting die (30) to a casting drum (31) while forming a casting bead (38). An upstream side (38a) area of the casting bead (38) is decompressed by a decompression chamber (36) to (atmospheric pressure - 300) Pa. Air shielding plates (70, 71) are provided inside the decompression chamber (36). Openings (90) are respectively formed in upper half portions of the air shielding plates (70, 71). Adistance L (mm) between a contact position A of the casting bead (38) and the air shielding plate (70) is set in the range of 20 mm to 100 mm. After the casting bead (38) forms a casting film (39) on the casting drum (31) , the casting film (39) is peeled and dried to obtain a TAC film.
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Description

technical field

[0001] The present invention relates to a method of manufacturing a thin film, and more particularly, the present invention relates to a method of manufacturing a thin film used as a protective film of a polarizing filter and an optical compensation film in an LCD device or a photographic support film. Background technique

[0002] Cellulose acylate films, especially triacetate cellulose (TAC) films manufactured from TAC having an average degree of acetylation ranging from 57.5% to 62.5%, are used as photographic supports for photographic photosensitive materials due to their toughness and fire-resistant properties membrane. Further, due to its excellent optical isotropy, the TAC film is used as a protective film of a polarizing filter, an optical compensation film, for example, a wide viewing angle film or the like used in LCD devices currently expanding in the market.

[0003] Typically, TAC membranes are fabricated by solution casting. The method of solu...

Claims

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