Title:
METHOD OF LONGITUDINALLY STRETCHING THERMOPLASTIC RESIN FILM AND LONGITUDINALLY STRETCHED FILM PRODUCED BY THE METHOD
Document Type and Number:
WIPO Patent Application WO/2008/044671
Kind Code:
A1
Abstract:
A method of longitudinally stretching a thermoplastic resin film which comprises
pulling the thermoplastic resin film based on a difference in peripheral speed
between a pair of rollers to thereby stretch it in the longitudinal direction.
It is characterized in that a stretching initiation position is set between
the pair of rollers and the thermoplastic resin film is longitudinally stretched
while it is locally and rapidly heated to a temperature in the range of from [(Tg
of the film)-5°C] to [Tg+30°C] with a noncontact type heater for local
rapid heating disposed in the stretch initiation position and extending in the
film width direction.
Inventors:
YOSHIDA TETSUYA (JP)
Application Number:
PCT/JP2007/069666
Publication Date:
April 17, 2008
Filing Date:
October 09, 2007
Export Citation:
Assignee:
FUJIFILM CORP (JP)
YOSHIDA TETSUYA (JP)
YOSHIDA TETSUYA (JP)
International Classes:
B29C55/06; B29K1/00
Foreign References:
| JPS55142621A | 1980-11-07 | |||
| JP2004077684A | 2004-03-11 |
Attorney, Agent or Firm:
MATSUURA, Kenzo (P.O. Box 176 Shinjuku Sumitomo Bldg. 39F, 6-1, Nishi-shinjuku 2-chome, Shinjuku-k, Tokyo 39, JP)
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