Screw kneader for plastic material having a controlling mixing s

Details Screw kneader for plastic material having a controlling mixing s Screw kneader for plastic material having a controlling mixing s

1992-10-15

1994-06-07

Hornsby, Harvey C.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

366 88, 366 90, 366319, 366321, 366322, 425208, B01F 708, B29B 748

Patent

active

053183584

ABSTRACT:
A screw kneader for a plastic material in which a pair of longitudinal screws are rotatably mounted in respective bores for conveying plastic material through the kneader. The screws have spaced portions for advancing the plastic material from an inlet region to an outlet region and between the spaced portions is a section with reversed threads opposing plastic flow to effect mixing of the plastic material. The threads of the intermediate section are provided with openings to permit passage of up to 20% of said plastic material in the direction of advance. Transfer elements with helical threads connect opposite ends of the threads in the intermediate section with the threads of the inlet and outlet regions. The transfer elements of the two screws mutually engage one another to strip plastic material from one another and from the walls of the bores.

REFERENCES:
patent: Re23948 (1955-02-01), Fuller
patent: 3252182 (1966-05-01), Colombo
patent: 3382536 (1968-05-01), Fritsch et al.
patent: 3652064 (1972-03-01), Lehnen et al.
patent: 3680844 (1972-08-01), Menges et al.
patent: 3690623 (1972-09-01), Boyne
patent: 3843757 (1974-10-01), Ehrenfreund et al.
patent: 3941535 (1976-03-01), Street
patent: 4416606 (1983-11-01), Sugano et al.
patent: 4600311 (1986-07-01), Mourrier et al.
patent: 5044759 (1991-09-01), Gagliani

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