Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With accumulator – trap chamber – or serially arranged valves...
Patent
1997-04-02
2000-08-29
Mackey, James P.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With accumulator, trap chamber, or serially arranged valves...
425564, 425589, 425595, B29C 4556
Patent
active
061099104
ABSTRACT:
In an injection molding machine for thermoplastic resin, a mold clamping hydraulic circuit is constituted as a hydraulic circuit which can be optionally set to a pressure-free or substantially pressure-free state upon completion of closure of a mold mounted to a clamping unit. A movable mold of the clamping unit can be retracted with a low injection pressure by injecting the molten resin via an injection unit. A nozzle port opening to a space of a mold cavity is closed simultaneously with completion of the charge of predetermined amount of resin, and a mold clamping force at a high pressure is generated on the forward side of the mold clamping unit, thereby producing mold clamping at a predetermined position. Since the mold is in a pressure-free or substantially pressure-free state, the injection pressure may also be low. Accordingly, a resin injection amount for a single shot can be increased by several times without increasing the pressure of a hydraulic cylinder of an injection unit and, further, molded articles several times in size can be molded without increasing the mold clamping force of the clamping unit.
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Mackey James P.
Tohkai Juken Kogyo Kabushiki Kaisha
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