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|1. (WO2017033701) METHOD FOR PRODUCING RESIN FILM|
|Applicants:||DENKA COMPANY LIMITED
|Title:||METHOD FOR PRODUCING RESIN FILM|
[Problem] To provide a method for producing a resin film that contains an ethylene-chlorotrifluoroethylene copolymer and has excellent transparency and appearance. To additionally provide a method for producing a multilayer film and a method for producing an outdoor waterproof film, each of which uses this resin film. [Solution] A resin film having excellent transparency and appearance is able to be obtained by melting and kneading a resin composition, which contains an ethylene-chlorotrifluoroethylene copolymer, by an extruder provided with a T-die under specific conditions, and subsequently subjecting the resulting resin composition to casting with use of a cooling roll. The extruder is provided with a breaker plate between the front end portion of a screw and the T-die; the breaker plate is provided with a screen mesh; the aperture ratio of the breaker plate is 40-60%; the minimum opening of the screen mesh is 0.03-0.1 mm; and the temperature of the resin composition at the front end portion of the ejection port of the T-die is higher than the surface temperature of the cooling roll by 110-280°C.