IMPROVEMENTS IN PLASTICISING UNITS FOR SCREW INJECTION MOULDING MACHINES

Canada Patent

PATENT NO 2063924
APP PUB NO CA-2063924-A1
SERIAL NO

2063924

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Abstract

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This invention relates to an injection moulding machine and to plasticizing units in the moulding press of the moulding machine for moulding plastics and rubbers. The plasticizing unit comprises a screw and barrel, a compression zone and a plasticizing zone wherein the helical groove of the screw varies in cross-section such that the material is transferred from the screw into the barrel while being mixed and plasticized. Furthermore there is a short second zone in which the flow area in the barrel outside of the cylindrical envelope of the screw reduces from full area to zero area for the material to be returned to within the cylindrical interface of the barrel. The screw is axially movable for the injection action, such that the ram action of the moulding press is carried out by the screw itself.

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