Manufacturing method for oriented film, polarizing film,...

Details Manufacturing method for oriented film, polarizing film,... Manufacturing method for oriented film, polarizing film,...

2005-02-15

2005-02-15

Jackson, Monique R. (Department: 1773)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

C264S288400

Reexamination Certificate

active

06855276

ABSTRACT:
An oriented film of polyvinyl alcohol derived film with reduced stretch irregularity and uniform orientation in a wide range of a stretching ratio is obtained by a manufacturing method for an oriented film, comprising the steps of: contacting a non-stretched film, comprising polyvinyl alcohols or derivatives thereof, with moisture percentage adjusted to no more than 10%, to at least one heating roll currently driven and heating the film at no less than 70° C.; subsequently giving a tension and stretching using a peripheral velocity difference between the heating roll concerned and a stretch roll in a position ahead of said heating roll in a running direction of the film.

REFERENCES:
patent: 3985849 (1976-10-01), Notomi et al.
patent: 4643529 (1987-02-01), Hosonuma et al.
patent: 6055096 (2000-04-01), Michihata et al.
patent: 63-261201 (1988-10-01), None
patent: 10039137 (1998-02-01), None

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