EXTRUSION MOLDING OF PLASTIC PRODUCT

摘要

PROBLEM TO BE SOLVED: To simply obtain a large caliber tubular plastic product and a plate- shaped plastic product without performing die replacing work. SOLUTION: An expansion member 10 having a large expanded ring 11 having a diameter larger than the diameter of a resin outlet 2 is provided in the vicinity of the resin outlet 2a of a circular die 2 in a freely detachable manner to extrude a tubular extrude E from the resin outlet 2a. This extrudate is passed along the outer pariphery of the expansion ring 11 in an unsolidified state to be expanded in its diameter direction to obtain a plastic product (P).