公开(公告)号：ID21788A

公开(公告)日：1999-07-22

申请号：ID990066

申请日：1998-07-09

Applicant: TORAY INDUSTRIES

Inventor： TSUNASHIMA KENJI ,  TOYAMA MASAHARU ,  MIYAKAWA KATSUYOSHI ,  OSADA SHUNICHI ,  CHIGIRA NOBUTSUGU ,  YOSHIMURA HIROSHI

IPC: B29C33/04 ,  B29C39/38 ,  B29C47/88

Abstract: The present invention provides a method and apparatus for producing a thermoplastic resin film, which allows a biaxially oriented polyester film to be formed at a high speed of 400 m/min or more. The method of the present invention is a method for producing a thermoplastic resin film, in which a molten thermoplastic resin film is brought into contact with a cooling medium, to be cooled and solidifed, for producing a cast film, characterized in that the surface temperature of the cooling medium in the region immediately before the melt reaching position is kept at not lower than the glass transition temperature Tg and not higher than the melting point Tm of the thermoplastic resin. The apparatus of the present invention is an apparatus for producing a thermoplastic resin, characterized in that a cooling medium has a heater and a cooler to ensure that the surface temperature of the cooling medium in the region immediately before the melt reaching position is kept at not lower than the glass transition temperature Tg and not higher than the melting point Tm of the thermoplastic resin, and that the surface temperature of the cooling drum in the region immediately before the film leaving position is kept lower than the the glass transition temperature Tg of the thermoplastic resin.