公开(公告)号：US20130269775A1

公开(公告)日：2013-10-17

申请号：US13911707

申请日：2013-06-06

Applicant: FUJIFILM Corporation

Inventor： Kiyokazu HASHIMOTO ,  Zemin SHI ,  Maki MIFUNE

IPC: H01L31/048 ,  B29C47/00

CPC classification number: B29C48/0018 ,  B29C55/04 ,  B29K2067/00 ,  C08J5/18 ,  C08J2367/00 ,  H01L31/049 ,  Y02E10/50

Abstract: A method for producing a polyester film includes: an unstretched film formation step of forming an unstretched polyester film having a thickness of from 2.5 mm to 5.0 mm by melt-extruding a polyester resin using an extruder, and cooling the polyester resin; and a stretching step of stretching the formed unstretched polyester film in at least one direction after heating the formed unstretched polyester film so as to have a mean temperature T1 (° C.), a surface temperature, and a central temperature. The mean temperature T1 (° C.) satisfies a relationship represented by formula (1): Tg−20° C.

Abstract translation: 聚酯膜的制造方法包括：通过使用挤出机熔融挤出聚酯树脂来形成厚度为2.5mm〜5.0mm的未拉伸聚酯膜的未拉伸成膜步骤，并冷却聚酯树脂; 以及在将所形成的未拉伸聚酯膜加热至平均温度T1（℃），表面温度和中心温度之后，在至少一个方向上拉伸所形成的未拉伸聚酯膜的拉伸步骤。 平均温度T1（℃）满足由式（1）表示的关系：Tg-20℃