Screening device
US4680108A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1986 |
| Grant date | Jul 14, 1987 |
| Priority date | — |
| Expiry date | Mar 4, 2006 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21D5/026
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A device for screening fluidizible 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, which may be a planar screen or a cylinder, 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. One or more dividing walls divide the chamber into a plurality of accept chambers, the dividing wall(s) extending radially when the screen is cylindrical, and parallel to the axis of rotation when the screen is planar. Dilution liquid may be added at the wall area between accept chambers. A rotor in the shape of a drum is used with the cylindrical screen, and a disc shaped rotor with the planar screen. The rotor also includes vanes at a portion adjacent the rejects outlet to facilitate pumping of rejects out the outlet, and dilution liquid may be added to further facilitate pumping of rejects out the o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.