Evacuation system for injection molding machine

Details Evacuation system for injection molding machine Evacuation system for injection molding machine

B - Operations, Transporting

29

C

18/713

B29C 45/77 (2006.01) B29C 45/34 (2006.01) B29C 45/43 (2006.01)

Patent

CA 1243463

EVACUATION SYSTEM FOR INJECTION MOLDING MACHINE Abstract of the Invention An apparatus for controlling operating pressure within a mold cavity of an injection molding die to minimize or eliminate defects in molding finely detailed parts and parts having thin walls includes a two-way pressure control which is preset to provide a controlled negative pressure during molding and a positive pressure, initiated while the mold is still closed, to aid in ejection of the molded parts from the mold. The control apparatus resets to repeat the procedure for subsequent molding cycles. The procedure includes a cleaning stage for preparing the mold cavity for each mold cycle.

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