Title:
METHOD FOR STRETCHING FILM
Document Type and Number:
WIPO Patent Application WO/2012/127917
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method for stretching a thermoplastic resin film that is suitable for use particularly in optical applications, that has excellent uniformity of thickness in the longitudinal direction and width direction, and that has minimal damage defects such as adhesion damage or transfer damage. This purpose is achieved by a method for stretching a film in the longitudinal direction by a difference in circumferential speed between front and rear rollers, wherein infrared rays are emitted to the film by concentration heaters from above the film and below the film, and the film is longitudinally stretched, the longitudinally-directed length of the film surface over which converged infrared rays are emitted from above the film being a, the longitudinally-directed length of the film surface over which converged infrared rays are emitted from below the film being b, the a component and b component overlapping each other, and a and b both being 10 mm to 40 mm.
Inventors:
KUSUNOKI YOHEI
HANADA TETSUJI
KURIHARA TSUTOMU
HANADA TETSUJI
KURIHARA TSUTOMU
Application Number:
PCT/JP2012/052825
Publication Date:
September 27, 2012
Filing Date:
February 08, 2012
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
KUSUNOKI YOHEI
HANADA TETSUJI
KURIHARA TSUTOMU
KUSUNOKI YOHEI
HANADA TETSUJI
KURIHARA TSUTOMU
International Classes:
B29C55/06; B29L7/00
Domestic Patent References:
| WO2006112425A1 | 2006-10-26 |
Foreign References:
| JP2000181015A | 2000-06-30 | |||
| JPH09141736A | 1997-06-03 | |||
| JP2001341259A | 2001-12-11 | |||
| JP2008093946A | 2008-04-24 | |||
| JPS50114476A | 1975-09-08 | |||
| JPH0356889B2 | 1991-08-29 | |||
| JP2008093946A | 2008-04-24 | |||
| JP2010167767A | 2010-08-05 |
Other References:
See also references of EP 2689914A4
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Claims: