PLASTICIZING UNIT FOR SCREW INJECTION MOULDING MACHINES

European Patent Office Patent

PATENT NO 0587574
APP PUB NO EP-0587574-A1
SERIAL NO

92907251

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Abstract

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A plasticizing unit for an injection moulding machine has a cylindrical barrel (1) with a cylindrical screw (4) movable axially and rotatably in it. The unit has an inlet (2) for material, a compression zone, a plasticizing zone (5, 6), and a cylindrical reservoir chamber for plasticized material, which is ejected into the mould by axial movement of the screw (4). The plasticizing zone (5, 6) is of the Transfermix type, where the cross section of the helical groove of the screw (4) varies from full area to zero area and the cross section of a corresponding groove in the barrel (1) varies from zero area to full area so that the material is transferred to the barrel groove, and a return zone (7) after the plasticizing zone (5, 6) returns the material to the reservoir chamber. The screw (4) has a part (9), where its helical groove is of zero area, which acts as a piston in the reservoir chamber for the injection action.

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