Injection molding flow control method
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United States of America Patent
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Sep 2, 2008
Grant Date -
Sep 27, 2007
app pub date -
Jun 4, 2007
filing date -
Sep 21, 1999
priority date (Note) -
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Abstract
In an injection molding machine having upstream and downstream channels communicating with each other for delivering fluid material to one or more mold cavities, apparatus for controlling delivery of the melt material from the channels to the one or more mold cavities, each channel having an axis, the downstream channel having an axis intersecting a gate of a cavity of a mold, the upstream channel having an axis not intersecting the gate and being associated with an upstream actuator interconnected to an upstream melt flow controller disposed at a selected location within the upstream channel, the apparatus comprising a sensor for sensing a selected condition of the melt material at a position downstream of the upstream melt flow controller; an actuator controller interconnected to the upstream actuator, the actuator controller comprising a computer interconnected to a sensor for receiving a signal representative of the selected condition sensed by the sensor, the computer including an algorithm utilizing a value indicative of the signal received from the sensor as a variable for controlling operation of the upstream actuator; wherein the upstream melt flow controller is adapted to control the rate of flow of the fluid material at the selected location within the upstream channel according to the algorithm.
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