Screening apparatus for paper making stock
US4919797A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1989 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Feb 9, 2009 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21D5/026
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In screening apparatus for paper making stock comprising a cylindrical screening member dividing the interior of a pressure housing into a supply chamber and an accepts chamber, and also comprising a rotor mounted for rotation in the supply chamber and including a plurality of vanes mounted thereon in angularly spaced relation with each other and in relatively closely spaced relation with the screening member, each of the vanes is of generally airfoil shape and is oriented with its leading edge closest to the screening member and with the surface portion thereof trailing the leading edge diverging from the screening member to create a positive pressure force along the leading edge followed by a negative pressure force between the trailing portion and the screening member. A cap on each end of each vane extends radially outwardly from each end of the trailing portion of the vane and substantially closes the adjacent axial end of the space between the trailing portion of the vane and the screening member, and a bar is mounted on the trailing ends of each of these caps to define a slot extending along the trailing edge of the vane and leading directly from the space between the vane a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.