Method for manufacturing polarizer, polarizer, polarizer...

Details Method for manufacturing polarizer, polarizer, polarizer... Method for manufacturing polarizer, polarizer, polarizer...

2006-07-04

2006-07-04

Vargot, Mathieu D. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

C264S001600, C264S002700

Reexamination Certificate

active

07070718

ABSTRACT:
A polarizer comprising polyvinyl alcohol based films stretched at high stretching ratios stably manufactured: a method for manufacturing including a stretching processing process, a dyeing treatment process, and a boron compounds treatment process to a polyvinyl alcohol film, wherein the stretching processing is performed at least twice so that a total stretching ratio may become 5.5 times or more, and in a second stretching processing or later, wet stretching processing having stretching ratios of 1.2 times or more is performed applying a peripheral velocity difference between a first pinch roll and a second pinch roll, and in the wet stretching processing, a film conveyed out from the first pinch roll is passed on a first guide roll so as to make a holding angle (A) of 120 through 175° on a first guide roll to which the film first contacts.

REFERENCES:
patent: 6757102 (2004-06-01), Nishida et al.
patent: 64-7575 (1989-02-01), None
patent: 2731813 (1997-12-01), None
patent: 2001-141926 (2001-05-01), None
patent: 2001-154020 (2001-06-01), None
patent: 2002-40255 (2002-02-01), None

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