MOLDING OF MOLDED PRODUCT HAVING BELLOWS PART

摘要

PROBLEM TO BE SOLVED: To automatically demold a bellows-shaped hollow molded product closed at one end thereof. SOLUTION: In this molding method, a core press pin 25 is allowed to descend before the completion of injection while a core pin 14 is set to a center support state to perform molding to mold a molded product W so as to close the leading end thereof. When the molded product W is ejected by an ejector pin 16, air is blown out of a blowoff port 22 to expand the molded product W. By this constitution, the undercut relation of the core pin 14 and the molded product W is released to automatically demold the molded product.