Combined screening and reject reduction
US4699324A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1986 |
| Grant date | Oct 13, 1987 |
| Priority date | — |
| Expiry date | Jun 13, 2006 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21D5/026
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A device for screening fluidizable suspensions, such as medium consistency (e.g. 6-15 percent solids) paper pulp includes a housing with a main suspension inlet and a main (rejects) outlet. A rotor having a plurality of ribs is mounted in the housing for rotation about an axis. A stationary screen is disposed in the housing between the main inlet and outlet. The stationary screen defines, with the housing, a chamber, and the rotor is positioned so that the ribs sweep past the screen, with only a small clearance between the screen and ribs. Between the screen and the outlet grinding elements are provided, comprising a stationary grinding ring connected to the housing, and a movable grinding ring connected to the rotor for rotation with the rotor. The grinding elements define a grinding slot between them. The grinding slot is adjustable either by replacing one or both of the grinding rings, or by forming the grinding elements so that they are conical and adjusting the axial position of the rotor in the housing. Vanes mounted on the rotor are disposed downstream of the grinding elements and effect shive reduction as well as pumping rejects out of the main outlet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.