Stock formation in a paper making process
US4140573A · kind A · utility
18Cited by
5References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 2, 1976 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Nov 2, 1996 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F1/20
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The paper-making stock on a paper machine is improved by running the forming fabric, carrying the stock, as a layer of a dilute aqueous dispersion of fibers, over a modified low-vacuum suction box having a slotted cover made up of elongated blades dividing the suction area into a grid. The surfaces of some of the blades support the fabric and the surfaces of others are lowered a small amount to allow the fabric to undulate and agitate the stock without substantially changing the grid area of the drainage surface. The lower level surfaces form a fluid seal with the undersurface of the fabric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.