Feed screw for sedimentation or treatment systems
US5529170A · kind A · utility
4Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 20, 1995 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Jan 20, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65G33/265
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention concerns a feed screw in the form of a self-supporting, axleless helix whose surface extends essentially radially, the feed screw being used in sedimentation or treatment systems for clearing suspensions in paper making processes. The invention is characterized by a second helix whose surface, or generatrix, deviates preferably between 0.degree. and 20.degree. from the direction of the central axis and extends in the feed direction. The second helix may deviate between 0.degree. and maximally 40.degree. and have a length--per lead--between 20% and 40% of the lead of the helices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.