Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Molding pressure control means responsive to pressure at...
Patent
1994-05-31
1995-12-05
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Molding pressure control means responsive to pressure at...
264 405, 264334, 425556, B29C 4778
Patent
active
054723310
ABSTRACT:
An apparatus for approximating the mold cavity pressure during injection of a liquid material by measuring the pressure exerted by the liquid against the ejector assembly. The ejector assembly includes an ejector sleeve and a support. A load sensor is positioned between the load and support to measure the pressure. Preferably, a force translation fixture is positioned between the ejector sleeve and the sensor. In a first alternative embodiment, the sensor is omitted and a strain gauges are mounted on the fixture to measure the elastic deformation of the fixture and approximate mold cavity pressure. In a second alternative embodiment, the strain gauges are mounted on a reduced diameter portion of the tubular wall of the ejector sleeve. In a third alternative embodiment, the base of the ejector sleeve is separated into two lobes connected to one another by two bending beams. Strain gauges mounted on the lobes and bending beams measure the elastic deformation of the flange to approximate pressure. And in a fourth alternative embodiment, strain gauges are applied to the core pin to approximate pressure in the mold cavity.
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Heitbrink Tim
RJG Technologies, Inc.
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