The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 29, 1994
Filed:
Jul. 26, 1993
Arno Knoll, Stuttgart, DE;
Wolfgang Woerz, Illingen, DE;
Werner & Pfleiderer GmbH, Stuttgart, DE;
Abstract
A twin screw extruder for processing plastic material having a housing provided with a plurality of juxtaposed housing segments arranged axially in succession and defining two longitudinal, overlapping bores respectively containing two coaxially arranged extruder screws, rotatable about respective longitudinal axes, and having intermeshing threads. One of the housing segments serves as a degassing housing segment for degassing the plastic material and it is connected to a degassing chamber. The degassing housing segment has a transverse, radial opening in which an insert member is fitted, the insert member having a degassing opening providing communication between the degassing chamber and the bores in the housing. The degassing opening tapers in widening fashion in the direction from the longitudinal bores to the degassing chamber, and the degassing opening has a longitudinal axis disposed in a plane passing through the longitudinal axes of the screws. The insert member can be mounted at either or both sides of the housing and a sealing insert member is inserted in the opening in the housing segment which is to be blocked. The degassing opening is rectangular in cross-section.