Patent · US Active

Extruder having a set back gas-permeable wall portion

US7607817B2 · kind B2 · utility

5Cited by

6References

7Claims

0Family size

Assignee

COPERION GMBH · DE

Inventors

Hans-Joachim Sämann · Bietigheim-Bissingen, DE
Werner Wiedmann · Stuttgart, DE
Jurgen Strecker · Stuttgart, DE
Peter Heidemeyer · Kornwestheim, DE
Sören Welb · Ilsfeld, DE

Key dates

Filing date	Mar 27, 2008
Grant date	Oct 27, 2009
Priority date	—
Expiry date	Mar 27, 2028

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C48/763
WIPO fieldOther special machines
WIPO sectorMechanical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.