METHOD AND APPARATUS FOR PRODUCING INFLATION FILM

摘要

PROBLEM TO BE SOLVED: To easily reduce the thickness irregularity of a rolled-shaped raw sheet obtained by taking up an inflation film. SOLUTION: In an inflation film producing apparatus, a resin is extruded in a molten state and drawn out of the die lip of a film molding die to be formed into an inflation film. A plurality of the heating elements 15 arranged at a predetermined interval along the vicinity of the peripheral edge of the die lip of the film molding die 12 and adjusting the thickness of the molten resin drawn out of the die lip and a control part 30 turning the heating elements 15 on/off a predetermined time interval and controlling them so that the mutually adjacent heating elements do not become an ON-state at the same time are provided.