Title:
PROCESS FOR PRODUCING CELLULOSE FILM, APPARATUS FOR PRODUCING CELLULOSE FILM, OPTICAL FILM PRODUCED BY SAID PRODUCTION APPARATUS, POLARIZING PLATE USING SAID OPTICAL FILM, AND LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/074588
Kind Code:
A1
Abstract:
This invention provides, for example, a highly planar optical film that can be
used, for example, in phase difference films for liquid crystal display devices,
and a process for producing the optical film by a melt casting film forming method.
A melt containing a cellulose resin is extruded from a casting die (4) onto a rotary
support (5) (a cooling roll). A nip pressing rotator (6) (touch roll) is energized
against the rotary support (5). The melt is nip pressed between the nip pressing
rotator (6) and the rotary support (5) to eliminate a die line and to eliminate
uneven thickness. To this end, nip can be formed between the nip pressing rotator
and the rotary support. The planarity of the film can be effectively corrected
by setting the linear pressure of an elastic roll and the temperature of the melt
immediately before nip pressing to respective predetermined ranges.
Inventors:
KAZAMA, Kenichi (Inc. 2970 Ishikawa-machi, Hachioji-sh, Tokyo 05, 1928505, JP)
Application Number:
JP2006/322440
Publication Date:
July 05, 2007
Filing Date:
November 10, 2006
Export Citation:
Assignee:
Konica Minolta Opto, Inc. (2970, Ishikawa-machi Hachioji-shi, Tokyo05, Tokyo1928505, 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, Tokyo1928505, 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, Tokyo1928505, JP)
International Classes:
B29C41/26; G02B5/30; G02F1/1335; G02F1/13363; B29K1/00; B29L7/00
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