Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1995-10-17
1997-05-20
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
249 59, 2643281, 264334, 425440, 425441, 425556, 425577, 425DIG58, B29C 4544
Patent
active
056309775
ABSTRACT:
An injection molding apparatus method and system for molding a plastic article having inward or outward projections on the exterior surface. The injection mold has a first and second mold part adapted to move between a closed, molding position and an open, article-recovering position and which defines a mold cavity for an article to be molded. The first expandable cavity mold part has a base with an opening therethrough and a plurality of outwardly tapered arms extending from the base to an open end that extends into the mold cavity where it is held in place by a striker plate during the injection molding process. The second inner mandrel mold part has a one and other end adapted to move reciprocally and longitudinally within the base and arms of the expandable cavity element, the top end threaded to form the interior threaded surface of the injection molded article. After injecting a molding plastic material at high pressure and temperature, the inner mandrel is removed from the inside and the striker plate removed from the upper side creating an article-recovering position for recovery of the injection molded article.
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Catalanotti Paul
Tarahomi Sassan
Crowley Richard P.
Heitbrink Jill L.
Roehr Tool Corporation
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