Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1991-12-02
1993-01-05
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
2643287, 26432811, 425145, 425149, 425150, 425156, 425167, 425590, B29C 4577
Patent
active
051768593
ABSTRACT:
An apparatus and method for controlling an injection molding device having a mold cavity therein use of periodically generated signals representative of the mold cavity pressure and mold cavity volume. These signals are used to control the magnitude of the clamping force imposed on a movable mold member. During a first time period following closure of the gate, in response to the signals representative of cavity pressure and cavity volume, the clamping force imposed on the movable mold member is adjusted to maintain, in closed loop fashion, cavity pressure constant. During a second time period following closure of the gate, in response to the signal representative of the cavity volume, the clamping force imposed on the movable mold member is adjusted to maintain, in closed loop fashion, cavity volume constant.
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Eastley Brian J.
Philips and Du Pont Optical Company
Silbaugh Jan H.
Spain Norman N.
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