Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Patent
1976-10-04
1979-01-23
Ross, Herbert F.
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
366318, 425208, A21C 106
Patent
active
041358252
ABSTRACT:
An installation is provided for extruding plastic material comprising a screw extruder having a cylinder provided with a hopper near the rearward end of said cylinder and with an extrusion head secured to the forward end of said cylinder, and at least one pump having a delivery pipe connected to at least one port disposed in the wall of said cylinder for delivering an additional fluid product to said extruder through said port or ports during the extrusion operation, the inner surface of said cylinder including a zone provided with grooves extending downstream starting from said hopper over a limited distance, said port or ports opening out into one or more of said grooved zone, said grooved zone being followed by a smooth zone, the inside diameter of which is less than the maximum diameter measured from the bottoms of said grooves, and wherein said screw extruder is of essentially uniform dimensions at the point of said zone and the portion of said screw extruder immediately upstream thereof.
REFERENCES:
patent: 2496625 (1950-02-01), Henning
patent: 3177272 (1965-04-01), Plymale
patent: 3193877 (1965-07-01), Edwards
patent: 3300811 (1967-01-01), Berger
patent: 3632255 (1972-01-01), Geyer
patent: 3797808 (1974-03-01), Ma
patent: 3944191 (1976-03-01), Karamatsu
Maillefer S.A.
Ross Herbert F.
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