Patent ID: 7527490

Claim:
A coinjection molding apparatus comprising: a manifold comprising a first manifold melt channel, a second manifold melt channel, and a guide bore; a nozzle body comprising a longitudinal bore aligned with the guide bore, the nozzle body coupled to the manifold; a sleeve disposed within the longitudinal bore, the sleeve comprising a tip portion comprising an opening, and the sleeve having a hollow section and a section narrower than the longitudinal bore thus defining an outer melt channel between the sleeve and the nozzle body, the outer melt channel communicating with the first manifold melt channel, the sleeve slidably disposed in the guide bore to open and close melt communication of the outer melt channel to a cavity gate by the tip portion of the sleeve; a pin disposed within the hollow section of the sleeve and comprising a tip, the pin having a section narrower than the hollow section of the sleeve thus defining an inner melt channel between the pin and the sleeve, the inner melt channel for communicating with the second manifold melt channel, the pin slidably disposed in the sleeve to open and close melt communication of the inner melt channel to the opening of the sleeve by the tip of the pin; and a nozzle tip coupled to the nozzle body and comprising a nozzle tip melt channel in communication with the longitudinal bore and forming part of the outer melt channel, the nozzle tip further comprising an alignment portion contacting the sleeve, the alignment portion for aligning the tip portion of the sleeve with the cavity gate along the sliding range of the sleeve.