Twin screw extruders

Details Twin screw extruders Twin screw extruders

1977-12-15

1978-11-28

McCarthy, Edward J.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

B29F 302

Patent

active

041273311

ABSTRACT:
A twin screw extruder comprising a cylinder having twin bores therein to receive the twin screw of the extruder and a circular casing with at least one passage to permit heating or cooling fluid to flow between the cylinder and the casing, in which the cylinder has a generally circular outside contour with a first set of grooves and a second set of grooves forming parts of said at least one passage, extending obliquely to the longitudinal axis of the cylinder and formed in the outer surface of the cylinder, the bottom walls of the grooves extending parallel to a plane which includes the two longitudinal axes of the twin bores with the first set of grooves lying on one side of said plane, and the second set of grooves lying on the other side of said plane, the inclination of said first set of grooves to said axis being opposite to the inclination of said second set of grooves to said axis, and the inside of the casing containing spaced recesses forming further parts of said at least one passage and, except for end ones of said recesses, each connecting one end of a respective one of the grooves of the first set of grooves to one end of a respective one of the grooves of the second set of grooves.

REFERENCES:
patent: 1356691 (1920-10-01), Bowen
patent: 3468518 (1969-09-01), Koch
patent: 3856278 (1974-12-01), Eisenmann

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