Sprue gated stack injection molding system

Details Sprue gated stack injection molding system Sprue gated stack injection molding system

B - Operations, Transporting

29

C

18/703

B29C 45/00 (2006.01) B29C 45/27 (2006.01) B29C 45/32 (2006.01)

Patent

CA 1265908

ABSTRACT OF THE DISCLOSURE A stack injection molding system for conveying melt from an upstream heated nozzle seated in a fixed mold platen to an aligned downstream heated nozzle in a movable mold platen. The upstream and downstream nozzles each have a nose portion with a forward face which abuts against each other in the parting line in the closed position. The melt passage extends through aligned central melt bores in the nozzles which taper inwardly adjacent the forward faces to form a sprue gate where they join. While both nozzles have an integral electrical heating element, only the heating element of the upstream nozzle has a circular forward portion which is brazed in the nose portion to encircle the melt bore and provide more heat and better control adjacent the sprue gate. Before the mold is opened along the parting line for ejection during the injection cycle, power to the heating elements of the nozzles is turned off to avoid drooling of melt from the open sprue gate.

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