Method and apparatus for producing polybutylene terephthalate film, and shape-memory polybutylene terephthalate laminate film

摘要

A method for producing a polybutylene terephthalate film by an air-cooled inflation method of inflating a tube of a molten polybutylene terephthalate resin extruded from an annular die by the injection of air, the resin-extruding pressure being 8.3 to 13.7 MPa, and the resin-extruding temperature being a temperature ranging from the melting point of the polybutylene terephthalate resin -15° C. to the melting point -5° C.