公开(公告)号：EP0943414A4

公开(公告)日：2002-07-10

申请号：EP98931031

申请日：1998-07-09

Applicant: TORAY INDUSTRIES

Inventor： TSUNASHIMA KENJI ,  TOYOMA MASAHARU ,  MIYAKAWA KATSUTOSHI ,  OSADA SHUNICHI ,  CHIGIRA NOBUTSUGU ,  YOSHIMURA HIROSHI

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

CPC classification number: B29C39/38 ,  B29C33/044 ,  B29C33/046 ,  B29C47/0021 ,  B29C47/8845 ,  B29C47/887 ,  B29C47/888

Abstract: A method of producing a thermoplastic resin film capable of giving a biaxially oriented polyester film at a speed of as high as at least 400 m/min and an apparatus therefor. Specifically, a method of producing a thermoplastic film, wherein a molten thermoplastic resin film is closely bonded to, and cooled and solidified, on a cooling medium to prepare a cast film, characterized in that the surface temperature of the medium immediately before the melt is brought into contact therewith is higher than a glass transition temperature Tg of the thermoplastic resin but is lower than a melting point Tm thereof. The apparatus has a heater device and a cooler provided in the cooling medium so that the surface temperature of the medium immediately before the melt is brought into contact therewith is higher than the glass transition temperature Tg of the thermoplastic resin but is lower than the melting point Tm thereof, and the surface temperature of the medium immediately before being peeled off is maintained to be lower than the glass transition temperature Tg of the thermoplastic resin.