Coinjection hot runner injection molding system

摘要

A coinjection molding apparatus is disclosed that provides first and second material melt streams to a nozzle. The nozzle defines a first material melt channel for receiving the first material melt stream and a second material melt channel for receiving the second material melt stream. The nozzle includes a sleeve and a nozzle tip having a tip divider. The sleeve is disposed within a longitudinal bore of the nozzle to divide the nozzle bore into the first material melt channel and the second material melt channel. The nozzle tip is coupled to a downstream end of the nozzle and defines a first material melt passage for receiving the first material melt stream from the first material melt channel of the nozzle and a second material melt passage for receiving the second material melt stream from the second material melt channel of the nozzle. The tip divider includes an upstream segment that is engaged with a downstream end of the sleeve to provide fluid communication between the first material melt passage of the nozzle tip and the first material melt channel of the nozzle.

主权项

1. A coinjection nozzle for delivering molding material to a mold gate, the coinjection nozzle comprising:
a first material melt channel for carrying a first material melt stream and a second material melt channel for carrying a second material melt stream, the second material melt channel concentric with the first material melt channel; a sleeve disposed to extend within a longitudinal bore of the nozzle to divide the longitudinal bore into the first material melt channel and the second material melt channel, the first material melt channel defined by an inner surface of the sleeve, and the concentric second material melt channel defined between an outer surface of the sleeve and the longitudinal bore; and a nozzle tip coupled to a downstream end of the nozzle that defines a first material melt passage for receiving the first material melt stream from the first material melt channel of the nozzle, and a second material melt passage for receiving the second material melt stream from the second material melt channel of the nozzle, the nozzle tip includes a tip divider that defines at least a portion of the second material melt passage of the nozzle tip, the tip divider includes an upstream segment that is engaged with a downstream end of the sleeve to provide fluid communication between the first material melt passage of the nozzle tip and the first material melt channel of the nozzle.