INJECTION MOLDING FLOW CONTROL APPARATUS AND METHOD

摘要

Apparatus for controlling the rate of flow of fluid material through an injection molding flow channel leading to a gate of a mold cavity, the apparatus comprising: a pin having a longitudinal length being adapted for back and forth axial movement through the flow channel; the pin having a protrusion having a maximum diameter circumferential surface; the channel having an interior surface complementary to the maximum diameter circumferential surface of the protrusion; the pin being slidable to a position within the channel such that the maximum diameter circumferential surface of the protrusion forms a seal with the complementary interior surface portion of the channel to stop flow of the fluid material, an electrically powered actuator interconnected to and controllably driving the pin through the channel.