Venting means for screw extruders

Details Venting means for screw extruders Venting means for screw extruders

1980-05-23

1981-11-03

Thurlow, Jeffery R.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

264102, 264DIG78, 366 75, 425154, 425203, 425208, 425DIG60, B29F 303

Patent

active

042983223

ABSTRACT:
In venting means for a screw extruder, particularly for thermo-plastics material, which venting means comprises a substantially vertical venting shaft communicating with the bore of a cylinder of the extruder and coupled to a low pressure source by a pipe, a pivotable flap which is moved from its normal position shown, when acted upon by plastics melt being extruded and rising in the shaft due to malfunction of the extruder, to cover the end of the pipe and prevent the melt passing into the pipe.

REFERENCES:
patent: 2959900 (1960-11-01), Wollett
patent: 3360824 (1968-01-01), Schippers
patent: 4120050 (1978-10-01), Craig et al.
patent: 4197268 (1980-04-01), Anders

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