公开(公告)号：US3651200A

公开(公告)日：1972-03-21

申请号：US3651200D

申请日：1969-08-28

Applicant: UNITIKA LTD

Inventor： KUGA MUTSUO ,  MASHIMO TAKESHI ,  WATANABE JUNKICHI ,  ARAI TERUO ,  YANO YOSHIHIKO

IPC: B29C51/04 ,  B29C55/16 ,  B32B27/16 ,  C08J5/18 ,  C08L77/00 ,  B29C17/02

CPC classification number: B32B27/16 ,  B29C55/16 ,  C08L77/00 ,  C08L2205/02

Abstract: PRIOR TO BIAXIALLY DRAWING A POLYAMIDE FILM, THE FILM IS ELONGATED IN THE LONGITUDINAL DIRECTIN TO AN EXTENT OF 1 TO 15% IN ADDITION TO THE NATURAL ELONGATION DUE TO WATER ADSORPTION WHILE ADSORBING 2 TO 10% BY WEIGHT WATER.

THIS PRETREATMENT PREVENTS A NONUNIFORMITY DEFECT IN THE FILM TERMED "LAXATION".