Screen having inclined slots for use in a continuous digester
US6039841A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 1997 |
| Grant date | Mar 21, 2000 |
| Priority date | — |
| Expiry date | Dec 2, 2017 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C7/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A screen used in the production of cellulose pulp mounted in a digester minimizes traditional screen problems (including clogging) without introducing new problems. The screen comprises a screen plate secured to an internal surface of the digester. The screen plate has a plurality of slots formed in it with an inclination angle, and the screen plate is positioned in the digester so that the inclination angle of the slots relative to the horizontal X axis of the X-Y plane defined by the internal surface of the digester is between 30-60.degree.. The screen plate may comprise a plurality of parallel screen bars side-by-side, or an integral metal plate with slots formed in it. The slots typically have a width between 1-5 millimeters and a spacing between them of 3-9 millimeters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.