Title:
METHOD FOR MANUFACTURING OPTICAL FILM
Document Type and Number:
WIPO Patent Application WO/2011/148834
Kind Code:
A1
Abstract:
Disclosed is a method for manufacturing optical film which ensures manufacturing of optical film having stabilized performance when the optical film is manufactured by solution casting. To this end, the method for manufacturing optical film employs a solution casting apparatus to manufacture thin optical film. The solution casting apparatus performs a casting step of allowing a dope of raw resin dissolved in a solvent to be cast as dope film from a die onto an endless-belt-shaped support to form a web; and at least steps of drawing, drying, and winding the web after the web is stripped from the endless-belt-shaped support. The die has a pressure reducing means upstream in the direction of travel of the endless-belt-shaped support and a pressure applying means downstream in the direction thereof, so that the absolute value of ΔPH/ΔPL ranges from 0.02 to 1.0, where ΔPL is the difference between the pressure caused by the pressure reducing means and the atmospheric pressure and ΔPH is the difference between the pressure caused by the pressure applying means and the atmospheric pressure.
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Inventors:
SUGITANI Syouichi (Inc. 2970, Ishikawa-machi, Hachioji-sh, Tokyo 05, 〒1928505, JP)
Application Number:
JP2011/061397
Publication Date:
December 01, 2011
Filing Date:
May 18, 2011
Export Citation:
Assignee:
KONICA MINOLTA OPTO, INC. (2970, Ishikawa-machi Hachioji-sh, Tokyo 05, 〒1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町２９７０番地 Tokyo, 〒1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町２９７０番地 Tokyo, 〒1928505, JP)
International Classes:
B29C41/28; B29C41/36; G02B5/30; B29L7/00; B29L11/00
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Claims: