| 摘要 |
Provided is a method of manufacturing a biaxially stretched thermoplastic resin film that is excellent in dimensional stability and hydrolysis resistance. The method includes a process of forming a thermoplastic resin sheet, a process of longitudinally stretching the resin sheet in a longitudinal direction, and a process of transversely stretching the resin sheet in a transverse direction after the longitudinal stretching. The transverse stretching process includes a process of preheating the resin sheet after the longitudinal stretching, a process of transversely stretching the resin sheet in the transverse direction after the preheating, a process of thermally fixing the film that is obtained through the stretching, a process of relaxing the tension applied to the film, and a process of cooling the film. |
