FLAT BLOW MOLDING DEVICE

摘要

PURPOSE:To provide a flat blow molding device in which changing of width of a flat parison extruded out of the device can be carried out. CONSTITUTION:A parison of hollow flat shape is extruded out of a clearance between a flat core 12 and a flat die 13 surrounding the core in a flat blow molding device. Both ends 13b of the die 13 are respectively formed slidably in the width direction to a central section 13a of the die, and the core 12 is set replaceably in compliance with the expansion and contraction of said die 13 in the width direction. The flat core 12 is composed of a flat replaceable section 12b at the center and unreplaceable sections 12a of curved shape at both ends, and said replaceable section 12b only can be replaced.