Method for screening paper fiber stock
US4105543A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 1976 |
| Grant date | Aug 8, 1978 |
| Priority date | — |
| Expiry date | May 14, 1996 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21D5/026
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of screening paper fiber stock incorporating a screen member having generally circular perforations and a rotor supporting vanes movable in the supply chamber, the rotor vanes are spaced from the screen member by a substantial distance (3/16"-1/2") to establish a tubular layer of stock of corresponding radial thickness adjacent the screen member, the rotor is operated at high speed to develop strong hydraulic shear forces in the tubular layer of stock causing tangential orientation of predominantly two-dimensional contaminant particles, and ribs on the inlet side of the screen member cause the stock to be continuously recirculated in the supply chamber to prevent undue increase in the consistency of the stock in the tubular layer, thereby enabling the screen to operate effectively at high capacity and high stock consistencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.