Title:
HEAT TREATMENT OF THERMOPLASTIC FILM
Document Type and Number:
Japanese Patent JPH04270631
Kind Code:
A
Abstract:
PURPOSE: To obtain a film having stability by uniformizing the physical properties in the lateral direction of the film.
CONSTITUTION: In the heat treatment of a thermoplastic film in such a state that the end parts of said film are grasped, when the max. temps. of the heat shrinkage stress of the end parts and central part of the film in the longitudinal direction thereof are respectively set to TE and TC(°C), the film to be heat- treated satisfies 30>TC-TE≥0.
Inventors:
TSUNASHIMA KENJI
AOKI SEIZO
TOYODA KATSUYA
AOKI SEIZO
TOYODA KATSUYA
Application Number:
JP3092491A
Publication Date:
September 28, 1992
Filing Date:
February 26, 1991
Export Citation:
Assignee:
TORAY INDUSTRIES
International Classes:
B29C55/12; B29C71/02; B29K67/00; B29K77/00; B29L7/00; (IPC1-7): B29C55/12; B29C71/02; B29K67/00; B29K77/00; B29L7/00