Patent ID: 11965072
Assignee: UNITIKA LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC C  B | IPC B  C

Claim 8:
9. A method of producing the semiaromatic polyamide film according to claim 1, comprising:
extruding a semiaromatic polyamide from a T die to form an unstretched film of semiaromatic polyamide, and
biaxially stretching the unstretched film of semiaromatic polyamide at a temperature of 150° C., and then performing a heat setting treatment,
wherein the heat setting treatment is performed in a heat setting zone that is divided into two or more regions in a film traveling direction and provided with a gradient in temperature in which the temperature increases in the film traveling direction,
wherein the heat setting zone has a temperature in a first region of 260° C. to 280° C. and a temperature in a second region of 265° C. to 285° C.