Multi-screw extruder
US7080935B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2002 |
| Grant date | Jul 25, 2006 |
| Priority date | — |
| Expiry date | Oct 2, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a multi-shaft extruder for the continuous treatment and/or processing of bulk material, especially a powdery, granular or flocculent product, comprising a plurality of shafts (3) which are arranged in a crown-like manner in a cavity (1) of an extruder housing (2), said shafts extending parallel to the axial direction (A) of the extruder and forming an inner processing chamber (1a) inside the crown, and an outer processing chamber (1b) outside the crown. Each shaft carries a number of axially successive processing elements (4), at least part of the same being elements (4a; 4c; 4e) having a transporting effect, and with which adjacent shafts engage in a sealed manner at least in partial regions. At least one transporting endless screw element (4b; 4d; 4f) comprising at least one transporting screw thread (9, 10; 14, 15, 16; 19, 20) is placed in the region of the supply opening (21) in the extruder housing (2), and does not engage in a sealing manner in at least one partial region along the axial direction (A).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.