Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Patent
1981-10-21
1984-01-10
Coe, Philip R.
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
B29B 106
Patent
active
044250444
ABSTRACT:
In a single screw extruder mixer head for mixing high viscosity linear polyolefins materials employing a plurality of alternate longitudinal mixing and wiping barriers, the improvement of providing longitudinal radially-stepped regions on the opened bevelled leading edge portions of the outer surface of the wiping barriers to act as hydrodynamic wedges to the passage of polyolefin material passing between the surfaces and the inner walls of the extruder barrel; and radially-stepped opened bevelled leading edge portions of the outer surfaces of the wiping barriers and the outer circumferential surfaces of full diameter of the mixer head supporting an outer coating of gall-resistant material.
REFERENCES:
patent: 2607077 (1952-08-01), Dulmage
patent: 3486192 (1967-03-01), Le Roy
patent: 3730492 (1973-05-01), Maddock
patent: 4169679 (1979-10-01), Miller et al.
patent: 4321229 (1982-03-01), Blakeslee et al.
SPE ANTEC, (1978), pp. 450 et seq., Lai-Fook and Worth, "Rheodynamic Lubrication of Screw Flights to Reduce Air in Single-screw Extruders".
Gonser, H. S., "Elimination of Extruder Screw Galling", Plastics World, Oct. 1957.
Kurtz Stuart J.
Miller John C.
Scarola Leonard S.
Coe Philip R.
Epting Thomas W.
Union Carbide Corporation
Vicari Clement J.
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