| abstract |
(57) [Problem] To provide a method for producing a polyester film having excellent surface properties with low stain on the film surface with good productivity. The method for producing a polyester film of the present invention comprises extruding from a slit-shaped die, solidifying by cooling, In the method for producing a polyester film by longitudinal stretching, in the stage between the cooling and solidifying step and the longitudinal stretching step, a low molecular weight substance present on the film surface is subjected to a solvent treatment, a corona discharge treatment, a plasma discharge treatment and It is characterized by being removed by at least one kind of surface treatment selected from flame treatment. |