Injection molding apparatus for producing plastic lids

Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With product ejector

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Details

264334, 425577, 425809, 425DIG58, B29C 4544

Patent

active

056098944

ABSTRACT:
The present invention is a mold apparatus and method for injection molding a plastic part. A cavity mold part defines at least one main cavity. A core mold assembly has surfaces complementary with the main cavities. The core mold assembly includes an outer core mold part having a center opening. An outer ejector part is positioned for movement in the center opening. An inner stem ejector part is positioned within the outer ejector part. The cavity mold part and the core mold assembly are moved together and the thermoplastic material injected to form the plastic part. The cavity mold and the core mold assembly is separated. The outer and inner ejector parts are moved together and away from the outer core mold part. Preferably a stripper part rotates a portion of the formed part. The inner stem ejector part is then moved relative to the outer ejector part and completed plastic parts removed.

REFERENCES:
patent: 4618121 (1986-10-01), Conti
patent: 5053182 (1991-10-01), Hedgewick
patent: 5383780 (1995-01-01), McCready et al.

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