Method of recovering tobacco from stemmery discard
US5263589A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1992 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | Sep 18, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB07B7/083
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A stemmery discard of tobacco and soil particles is fed to an air/centrifugal separator in which a fraction of smaller tobacco particles is recovered with a low amount of soil. The residue from that separator is fed to a screen separator in which a fraction of larger tobacco particles is recovered with a low amount of soil. A residue from the rotary screen separator is fed to a gravity separator which recovers as much tobacco as possible without exceeding a preselected amount of soil. The screen separator may comprise a first separator screen to separate out a fraction of larger tobacco particles, and a second screen to separate out a fraction of smaller tobacco particles from the particles falling through the first screen; the particles retained by the second screen would be sent to the gravity separator, and the separated-out smaller particles would be discarded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.