Pressure generating device for injection moulding and use...

Details Pressure generating device for injection moulding and use... Pressure generating device for injection moulding and use...

B - Operations, Transporting

29

F

18/701

B29F 1/06 (1980.01)

Patent

CA 1150921

ABSTRACT OF THE DISCLOSURE Pressure generating apparatus for use in injection moulding at a high pressure or normal pressure may be a device attachable to any convenient part of an injection mould- ing machine, for example to the mould, the platens, or the tie bars. The apparatus operates independently from the normal pressure generating mechanism and acts on the content of the mould cavity only. The device comprises a pressure generating part, e.g. a hydraulic cylinder connected with a plunger which can bring the pressure inside the cavity to the desired level during an injection cycle and a valve to prevent flow back of melt from the mould cavity. The invention includes in- jection moulding machines incorporating the apparatus and methods of injection moulding using the apparatus.

336951

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