초록 ▼

A coinjection molding system for injecting skin and core material into a mold cavity. The system includes a three position actuator for moving a valve pin into a closed position in which neither skin nor core flow is permitted, a middle position in which only skin flow is permitted, and an open posi

A coinjection molding system for injecting skin and core material into a mold cavity. The system includes a three position actuator for moving a valve pin into a closed position in which neither skin nor core flow is permitted, a middle position in which only skin flow is permitted, and an open position in which skin and core flow is permitted. The actuator includes a first piston slidably mounted in an actuator housing, and a second piston, attached to the valve pin, slidably mounted within the first piston. A shut-off is provided in the manifold for preventing skin flow to a particular nozzle during sequential gating.

대표청구항 ▼

[ What is claimed is:] [1.]1. An injection molding apparatus for use in coinjection comprising:a valve pin actuator that supports a valve pin adapted to control skin material flow and core material flow into a mold cavity; andan injection molding nozzle to inject skin and core material into the mold

[ What is claimed is:] [1.]1. An injection molding apparatus for use in coinjection comprising:a valve pin actuator that supports a valve pin adapted to control skin material flow and core material flow into a mold cavity; andan injection molding nozzle to inject skin and core material into the mold cavity, wherein the valve pin reciprocates through the injection molding nozzle, the injection molding nozzle including:a nozzle body;an insert coupled to an end of the nozzle body, said insert including a bore in communication with a first bore of the nozzle body through which said core material is adapted to flow, and an annular spiral indentation formed on a surface of the insert about which the skin material is adapted to flow, said skin material to be fed into said spiral indentation from a second bore of the nozzle body through which said skin material is adapted to flow.