CURL CONTROL METHOD OF POLYIMIDE FILM, AND METHOD FOR MANUFACTURING POLYIMIDE FILM

摘要

PROBLEM TO BE SOLVED: To provide a method for controlling the amount of curl while having the least influence on film material property such as a coefficient of linear expansion (CTE).SOLUTION: A polyimide film is manufactured by a method for manufacturing the polyimide film having a first process of casting a polyimide precursor solution on a support body to form a self-supporting film, and a second process for carrying out stretching treatment of stretching the self-supporting film at least in the width direction, and heating treatment, A curl control method for the polyimide film controls the amount of curl by changing a ratio of the amount of stretching in a temperature region lower than (the thermal deformation start temperature Tof the self supporting film + 70°C) to the amount of stretching in a temperature region of at least (the thermal deformation start temperature Tof the self-supporting film + 70°C).