Title:
METHOD FOR PRODUCING LONGITUDINALLY-STRETCHING FILM
Document Type and Number:
WIPO Patent Application WO/2014/073019
Kind Code:
A1
Abstract:
One aspect of the present invention is a method for producing a longitudinally-stretching film equipped at least with a diagonal-stretching step for angling the optical axis of the longitudinal film by gripping both ends of a thermoplastic longitudinal film using a plurality of gripping tools, and conveying the gripping tools gripping both ends at a constant speed, then accelerating first gripping tools gripping one end faster than second gripping tool gripping the other end, and advancing the first gripping tools farther than the second gripping tools, the method for producing the longitudinally-stretching film being characterized in that after advancing the first gripping tools in the diagonal-stretching step, a relaxing treatment is performed for relaxing the distortional stress applied to the longitudinal film in the regions between adjacent first gripping tools.
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Inventors:
HATAKEYAMA SHIMPEI (JP)
Application Number:
PCT/JP2012/007112
Publication Date:
May 15, 2014
Filing Date:
November 06, 2012
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
B29C55/04
Foreign References:
| JP2006255892A | 2006-09-28 | |||
| JP2006224618A | 2006-08-31 | |||
| JP2008023775A | 2008-02-07 |
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
Etsuji Kotani (JP)
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