Injection molding apparatus for e.g. molded syringe, comprises mold cavity in fluid communication with nozzle melt channel for receiving melt stream through mold gate along edge of mold cavity, recess and valve pin

摘要

An injection molding apparatus comprises manifold having a manifold channel; nozzle coupled to manifold; mold cavity in fluid communication with nozzle melt channel for receiving melt stream through a mold gate along an edge of mold cavity; recess for receiving melt stream from nozzle channel; and valve pin having a tip portion, where the valve pin is slidable within nozzle channel from retracted to extended position. An injection molding apparatus comprises manifold (12) having a manifold channel (14) for receiving a melt stream of moldable material under pressure; nozzle (32) coupled to the manifold and having a nozzle melt channel (36) for receiving the melt stream from manifold channel; mold cavity (56) in fluid communication with the nozzle melt channel for receiving the melt stream through a mold gate (46) along an edge of the mold cavity; recess for receiving the melt stream from the nozzle channel and for fluidly communicating the melt stream to the mold cavity through the mold gate, the recess having a forward portion that at least partially extends forward of the mold gate; and valve pin (42) having a tip portion, where the valve pin is slidable within the nozzle channel from a retracted position in which the mold gate is open and the valve pin tip portion is unseated from the recess forward portion to an extended position in which an outer side surface of the valve pin blocks the mold gate and the valve pin tip portion is seated in the recess forward portion.