INJECTION MOLDING FLOW CONTROL APPARATUS AND METHOD

摘要

An apparatus for controlling the rate of flow of mold material to a mold cavity, the apparatus comprising: an injection molding machine and a manifold an actuator interconnected to a valve pin having a tip end, the actuator being drivable to move the valve pin along a path of travel starting from a downstream gate closed position continuously upstream to and through a series of successively upstream intermediate upstream gate open positions and further continuously upstream to a high upstream gate open position, a drive system connected to the actuator, the drive system being adapted to drive the actuator continuously upstream beginning from the gate closed position at one or more preselected intermediate velocities for one or more corresponding selected lengths of time and further subsequently driving the actuator continuously upstream at one or more high velocities that are higher than the intermediate velocities.