초록 ▼

A valve gated injection molding system to facilitate improved melt flow to the gate of the nozzle. The system includes an annular flow insert through which the valve pin passes. The annular flow insert includes an annular groove on its outer surface. The edge of the annular groove is spaced from the

A valve gated injection molding system to facilitate improved melt flow to the gate of the nozzle. The system includes an annular flow insert through which the valve pin passes. The annular flow insert includes an annular groove on its outer surface. The edge of the annular groove is spaced from the wall of the melt channel so that some of the melt can flow longitudinally between the edge of the groove and the wall, while the remainder of the melt flows in the groove. The flow direction initiated by the annular flow insert eliminates flow separation and dead spots about the valve pin. The system also includes an actuator assembly including a sled attached to the valve pin.

대표청구항 ▼

[ What is claimed is:] [1.] An injection molding apparatus, comprising:a nozzle having an inner bore that defines a melt channel extending therethrough and terminating at a gate;a valve pin to open and close the gate;an actuator coupled to the valve pin for causing longitudinal displacement of the v

[ What is claimed is:] [1.] An injection molding apparatus, comprising:a nozzle having an inner bore that defines a melt channel extending therethrough and terminating at a gate;a valve pin to open and close the gate;an actuator coupled to the valve pin for causing longitudinal displacement of the valve pin; anda flow insert disposed in said inner bore through which the valve pin extends, said flow insert having an outer surface with an annularly directed groove disposed there on for directing melt flow thereabout and toward the gate, wherein a melt-flow space is provided between said outer surface of the flow insert and said inner bore along the full length of said outer surface that said annularly directed groove is disposed thereon.