Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Patent
1979-06-28
1981-11-17
Coe, Philip R.
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
B29B 110
Patent
active
043008399
ABSTRACT:
This invention relates to a self-cleaning type extruder including a cylinder and at least two screws therein adapted to rotate in the same direction, the screws being in such a relation that at any position in at least a part of the screws which lies in the longitudinal direction of the extruder, the contour of one screw in a cylinder cross-section taken at right angles to the screw axes is in substantial contact at one point with the contour in the same cross-section of another screw intermeshing therewith. A conventional self-cleaning type extruder lacks the ability to knead a resin stock uniformly and sufficiently. This defect of the prior extruder is removed in accordance with the present invention by improving the aforesaid self-cleaning type extruder in such a way that each of the screws has at least two screw flights, and the top of at least one of the screw flights is substantially in contact with the inner wall surface of the cylinder and the top of at least one other screw flight has a predetermined tip clearance with respect to the inner wall surface of the cylinder. The extruder of this invention can achieve uniform and powerful kneading and melting of the resin stock.
REFERENCES:
patent: 3104420 (1963-09-01), Selbach
patent: 3900187 (1975-08-01), Loomans
patent: 4131371 (1978-12-01), Tynan
Coe Philip R.
Sekisui Kagaku Kogyo Kabushiki Kaisha
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