CO-INJECTION VALVE-GATE BUSHING WITH SEPARATE MATERIAL FLOW PATHS

摘要

Apparatus and methods for co-injection of plastic materials. Two plastic materials are injected through separate passageways (44, 48) in a bushing member (12) into the mold cavity (26). A pin member (60) positioned in a third passageway (46) in the mold bushing controls the introduction of the two plastic materials through an orifice (42) and into the cavity. An actuator mechanism (71) with pressure actuated piston members (70, 72) controls the movement of the pin member.