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:
Oct. 27, 2009
Filed:
Mar. 27, 2008
Hans-joachim Sämann, Bietigheim-Bissingen, DE;
Werner Wiedmann, Stuttgart, DE;
Jürgen Strecker, Korntal-Münchingen, DE;
Peter Heidemeyer, Kornwestheim, DE;
Sören Welb, Ilsfeld, DE;
Hans-Joachim Sämann, Bietigheim-Bissingen, DE;
Werner Wiedmann, Stuttgart, DE;
Jürgen Strecker, Korntal-Münchingen, DE;
Peter Heidemeyer, Kornwestheim, DE;
Sören Welb, Ilsfeld, DE;
Coperion GmbH, Stuttgart, DE;
Abstract
An extruder with a housing comprising parallel, partially inter-engaging bores and screws disposed therein is used when applying a method of feeding powdery bulk materials into such an extruder. A solid transport of powdery bulk material takes place in an inlet zone disposed downstream of a feed opening wherein said inlet zone is partially filled. The inlet zone is provided with at least one gas-permeable wall portion wherein a layer of bulk material is created on said wall portion, thereby preventing bulk material from passing through, The gas-permeable wall portion is connected to a vacuum source and to a pressure gas source. Furthermore, the gas-permeable wall portion has an inner wall which is set back with respect to the wall of the bores, thereby forming a gap with a partially annular cross section wherein a layer of the bulk material is formed in the gap.