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1. (WO2009060618) PROCESS FOR PRODUCING POLYAMIDE RESIN FILM AND POLYAMIDE RESIN FILM OBTAINED BY THE PROCESS

Pub. No.:    WO/2009/060618    International Application No.:    PCT/JP2008/003224
Publication Date: May 14, 2009 International Filing Date: Nov 7, 2008
IPC: B29C 55/16
B29K 77/00
B29L 7/00
Applicants: UNITIKA LTD.
ユニチカ株式会社
TSUBOUCHI, Kenji
坪内健二
NODA, Atsuko
野田敦子
KUWATA, Hideki
桑田秀樹
Inventors: TSUBOUCHI, Kenji
坪内健二
NODA, Atsuko
野田敦子
KUWATA, Hideki
桑田秀樹
Title: PROCESS FOR PRODUCING POLYAMIDE RESIN FILM AND POLYAMIDE RESIN FILM OBTAINED BY THE PROCESS
Abstract:
A process for producing a polyamide resin film. It is a process for simultaneous biaxial stretching by the tenter method in which width-direction edge parts of an unstretched film are gripped with clips and the film is biaxially stretched lengthwise and crosswise simultaneously. Until the crosswise stretching reaches a maximum stretch ratio after initiation of the crosswise stretching, the lengthwise-stretch ratio which is given in terms of straight-line distance between adjoining clips is prevented from decreasing by 5% or more of a maximum lengthwise-stretch ratio.