Screw-type extruder

Details Screw-type extruder Screw-type extruder

2005-03-22

2005-03-22

Soohoo, Tony G. (Department: 1723)

Agitating

Rubber or heavy plastic working

With specified vent means

C366S079000, C366S085000

Reexamination Certificate

active

06869211

ABSTRACT:
An extruder for processing of thermoplastics has a housing (1) in which a screw is pivotally supported. A land (5) which runs in a helical line protrudes from the core (4) of the screw. There is at least one ventilation opening in the housing in which the screw is pivotally supported. The land (5) of the screw at least in the area of the ventilation opening has an active flank, i.e. one which points toward the discharge end of the extruder and which encloses with the axis of the screw an acute angle such that at least in areas it is set back relative to a radial plane which passes through the outside edge (14) of the active flank (10). This prevents the plastic which is to be processed in the extruder from being pressed to the outside and clogging the ventilation opening.

REFERENCES:
patent: 3266097 (1966-08-01), Larsen
patent: 3572646 (1971-03-01), Kocher
patent: 3888469 (1975-06-01), Geyer
patent: 4425044 (1984-01-01), Kurtz et al.
patent: 4746220 (1988-05-01), Sukai et al.
patent: 5130070 (1992-07-01), Martin
patent: 5350231 (1994-09-01), Eigruber
patent: 5458475 (1995-10-01), Suumen
patent: 6129873 (2000-10-01), Shelby et al.
patent: 68 377 (1969-08-01), None
patent: 0 595 190 (1997-04-01), None
Derwent Abstract of DD 68377 A, Derwent ACC-NO 1983-808283, Copyright 1999 Derwent Information LTD, 2 pages.

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