Method and apparatus for producing film from polymer...

Details Method and apparatus for producing film from polymer... Method and apparatus for producing film from polymer...

2008-06-24

2008-06-24

Visconti, Geraldina (Department: 1795)

Compositions

Liquid crystal compositions

C430S020000, C430S449000, C428S001100, C428S001200, C438S778000, C438S781000, C349S001000, C349S002000, C349S187000, C349S193000

Reexamination Certificate

active

07390434

ABSTRACT:
A dope containing cellulose acylate as a main content of polymer is cast on a front surface of a moving belt in a method of producing a film from a solution. A drying apparatus is confronted to a back surface of said belt to evaporate a solvent in the gel-like film. Further, a condensers are confronted to a cast surface of said gel-like film to condense a solvent vapor for recovery. A wind speed above and near the gel-like film is from 0.01 m/s to 0.5 m/s, and the belt is transported downwards at the casting position PS. When d (mm) is a distance between the casting surface and each condenser, Tw (° C.) is a temperature of each condenser, and Ts (° C.) is a temperature of the casting dope, conditions are satisfied: Q=(Ts−Tw)/d and 5<Q<100. The obtained film is excellent in thickness uniformity and optical properties, and therefore adequate for the optical film.

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