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
1981-04-17
1983-10-25
Pavelko, Thomas P.
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...
425543, B29C 106
Patent
active
044116098
ABSTRACT:
A method of and an apparatus for molding a plastic wherein the injection pressure (transfer pressure) is switched to a holding pressure when the internal pressure of the mold cavity sensed by a pressure sensor reaches a predetermined injection pressure (transfer pressure), to initiate holding of the pressure applied to the cavity. The holding pressure is removed when the internal pressure thereof becomes zero or in accordance with the detection of a predetermined inflection point in the internal pressure which is indicative of a gate sealing point in the mold cavity or is brought to a predetermined value close to zero. The molded articles are of high precision finishes, and conservation of energy and natural resources can be achieved.
REFERENCES:
patent: 3920367 (1975-11-01), Ma
patent: 4208176 (1980-06-01), Salerno
Aoki Masayoshi
Kaneda Aizo
Oka Mitsunori
Sato Hidemi
Yokono Hitoshi
Hitachi , Ltd.
Pavelko Thomas P.
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