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Downstream pin velocity controlled injection molding apparatus and method

  • US 9,738,024 B2
  • Filed: 12/29/2015
  • Issued: 08/22/2017
  • Est. Priority Date: 12/13/2012
  • Status: Active Grant
First Claim
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1. A method for molding a plastic part, the method comprising:

  • providing a valve gated nozzle including a valve stem interconnected to an actuator movable between an open position and a closed position;

    wherein the valve gated nozzle comprises a gas metering mechanism comprising one or more shutters or adjustable aperture devices that are mounted on or to or are integral with the actuator and are adjustable to one or more selectable positions that controllably vary the degree of openness of the fluid flow ports,wherein the one or more shutters or adjustable aperture devices are interconnected to one or more electric motors which are interconnected to a controller and controllable to selectively adjust the shutters or adjustable aperture devices to the one or more selectable positions that correspond to reduced pressures or reduced flow rates during the course of at least a selected portion of the stroke length from the fully downstream gate closed position to the fully upstream gate open position,moving the valve stem via the gas metering mechanism at a first speed for a first portion between the open position and the closed position; and

    moving the valve stem at a second speed less than a maximum speed for at least a final 2 mm between the open position and the closed position.

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