B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/1211, 18/733
B29C 47/76 (2006.01)
Patent
CA 1041717
Abstract A rotary screw extruder and a method are provided to both devolatilize and dry plasticized resinous hygroscopic materials during extrusion thereof into a finished product of indefinite length. The extruder includes a screw having three successive pumping sections and a pair of vent sections. Each vent section separates two of the successive pumping sections. The first pumping section meters plasticized material through- flow. The intermediate pumping section has partially full channels that permit a continuous, helical passage to inter- connect the two vent sections. The partially full channels establish a free surface which promotes devolatilization and drying. The third pumping section pressurized the devolatilized and dried plasticized material for extrusion through a con- ventional die orifice. The devolatilizing and drying method begins by controlling the flow rate of plasticized material into a gas removal zone. The gas removal zone is provided with a flow capacity exceeding the controlled flow rate of plasticized material so that a helical, free surface exists throughout the gas removal zone. Each end of the gas removal zone is connected to a reduced pressure source. The plasticized material is worked as it goes through the gas removal zone to heat the material, to promote drying and devolatilization thereof, and to maintain a uniform flow rate. -1-
212146
Kruder George A.
Nichols Russell J.
Koehring Company
Na
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