PRODUCTION OF BIAXIALLY STRETCHED POLYMIDE FILM

摘要

PROBLEM TO BE SOLVED: To stably produce a simultaneously biaxially stretched polyamide film economically with good operability with less cutting of the film. ;SOLUTION: In a method for grasping both edge parts of an unstretched polyamide film 1 by a pair of left and right clips 2 to biaxially stretch the film longitudinally and laterally at the same time, simultaneous biaxial stretching is performed in such a state that the atmospheric pressure in the cover covering the link device 3 of a preheating stretching part 4 is made lower by 5-50 hPa than that of a part where the film passes.;COPYRIGHT: (C)2000,JPO