METHOD AND APPARATUS FOR PRODUCING POLYBUTYLENE TEREPHTHALATE FILM, AND SHAPE-MEMORY POLYBUTYLENE TEREPHTHALATE LAMINATED FILM

摘要

A method for producing a polybutylene terephthalate film by the air-cooling inflation method involving inflating a tube of a molten polybutylene terephthalate resin extruded from a ring die by means of the injection of air, characterized in that the resin is extruded under a resin pressure of 8.3 to 13.7 MPa and at a resin temperature of from the melting point of the above polybutylene terephthalate resin - 15°C to the above melting point - 5°C.