Apparatus for the liquid treatment of a fibrous board between two endless foraminous belts or wires
US4874468A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 1988 |
| Grant date | Oct 17, 1989 |
| Priority date | — |
| Expiry date | Oct 20, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D33/646
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to an apparatus or plant or arrangement for the treatment of a dilute suspension of fibers or layer of material passed between two endless foraminous belts or wires or the like conveying means, the forming fibrous board being made to pass between the foraminous belts along at least one container for a treatment medium and at least some of the treatment containers being provided with a wall having orifices on the side facing the fibrous board for generating a pressure difference on the same, but being otherwise closed against the environment, and/or at least some of the treatment containers closed against the environment having walls closed against the foraminous belts and thus against the fibrous board, but otherwise open towards the foraminous belts. According to the invention, a reduction of the energy requirement in the displacement washing of filter cakes is sought above all. This is achieved according to the invention in that in particular for countercurrent treatment, conveniently for countercurrent displacement washing, at least one treatment container arranged above the upper framinous belt, in particular in contact with said belt, is formed as a press…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.