| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing an inflation film of a polyester resin having a good appearance with good productivity. SOLUTION: The method for manufacturing the polyester film comprises a step of pinching the film at a position indicating a temperature higher by 0 to 25 deg.C than a glass transition point of the polyester resin on the surface of the film in the case of drawing the polyester resin after the steps ofextruding the polyester resin in a cylindrical state from a ring-like die, and holding the extruded polyester resin by pinching rolls. Thus, the film having no longitudinal wrinkle and no blocking can be obtained. In this case, it is desired to extrude the molten resin under the condition that a share rate of the resin to be applied becomes 20 to 200 (sec<-1> ). |
