MOLD FOR FORMING PLASTIC FOAM PARTS

摘要

A mold for forming plastic foam parts which has an improved arrangement for retaining within the molding cavity an insert onto which foam plastic is molded. A vacuum source communicates with the molding chamber through an inlet in the chamber wall. An insert is positioned over the vacuum inlet so that a continuous peripheral edge of the insert is sealingly interengaged on the wall, to thereby enseal vacuum between the insert and the chamber wall onto which the insert is positioned. The greater pressure outside of the ensealed vacuum acts on the insert to maintain the sealing interengagement of the insert edge with the chamber wall to thereby hold the insert in fixed position within the molding chamber.