Die null for formation of bowl condition goods which possess the undercut

摘要

PROBLEM TO BE SOLVED: To provide an injection mold capable of molding by injection a cup- shaped article made of a resin having an undercut part, by a simple mold structure not requiring a split mold structure and a complicated structure. ;SOLUTION: In a mold wherein a stripper plate 4 is interposed between a fixed mold 2 and a movable mold 3, packing members 25 are sealed in the packing grooves 24 formed to a cavity plate 14 and an insert die 17 and the cavity plate 14 and the insert die 17 are loosely fastened by bolts and an air introducing hole 27 introducing compressed air from the outside into the inside under surface parts of insert die flange parts 16 separated from the packing grooves 24 are bored in the cavity plate 14.;COPYRIGHT: (C)1998,JPO