Patent ID: 8469687

Claim:
A coinjection molding apparatus comprising: an injection molding nozzle having a skin material melt channel for carrying a skin material melt stream and a core material melt channel for carrying a core material melt stream; and a nozzle tip coupled to a downstream end of the nozzle that defines, a central skin material melt passage for receiving the skin material melt stream from the skin material melt channel of the nozzle, an annular core material melt passage for receiving the core material melt stream from the core material melt channel of the nozzle, and an annular outer layer melt passage fluidly connected to the central skin material melt passage via one or more radially extending tunnel channels, wherein a portion of the skin material melt stream received by the central skin material melt passage is directed to the outer layer melt passage via the one or more tunnel channels, and wherein the one or more tunnel channels cross the core material melt stream, and wherein the skin material melt stream from the central skin material melt passage, the core material melt stream from the core material melt passage, and the skin material melt stream from the outer layer melt passage combine within a gate area of the coinjection molding apparatus prior to entering a mold gate.