Degassification device for a screw extruder which processes plas

Details Degassification device for a screw extruder which processes plas Degassification device for a screw extruder which processes plas

1988-04-01

1989-10-31

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

With separate and distinct gas withdrawal chamber

222412, 222413, 366 84, 366318, 425208, B29C 4776

Patent

active

048773905

ABSTRACT:
A degassification device for a screw extruder which processes plastic material in which the extruder has a hollow housing and an extruder screw rotatable in the housing, the degassification device having a pair of degassification screws disposed adjacent to the extruder screw for rotation about axes parallel to the axes of rotation of the extruder screw. A housing headpiece accommodates the degassification screws and is in communication with the extruder housing such that gas and vapor produced in the extruder housing can flow radially therefrom into the housing headpiece for discharge therefrom. The degassification screws have threads which interengage one another and they are driven in the same direction of rotation. The housing headpiece has adjacent longitudinal bores which overlap one another and respectively receive the degassification screws therein with their threads interengaged with one another. The crests of the threads of the degassification screws pass in close proximity to the inner surface of the housing headpiece and the extruder screw. The length and cross sectional profile of the degassification screws are such that upon rotation of the screws, the overlapped bores in the housing headpiece are longitudinally and transversely traversed by the screws substantially in entirety.

REFERENCES:
patent: 3525124 (1968-08-01), Ocker
patent: 4077753 (1978-03-01), Tanaka
patent: 4107787 (1978-08-01), Ocker
patent: 4212543 (1980-07-01), Bersano

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