Apparatus for thickening pulp and paper stock
US5382327A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 1991 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Jan 29, 2011 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/18
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Embodiments of apparatus for thickening a liquid suspension of solid particles, such as papermaking pulp in water, include a pair of spaced apart rolls and a woven wire or plastic wire belt trained around these rolls. The suspension is supplied to the apparatus at the first roll for centrifugal extraction and is carried by the belt to the second roll for further water extraction and thickening, and is then discharged from the apparatus. In one embodiment, the first roll is formed with an open surface, and the suspension is delivered to the web at least partially by flowing through the first roll openings, from either a headbox in the on-running wedge zone or a headbox internal to the rolls to deliver stock outwardly through the roll. The apparatus may also include a second roll which is porous and has auxiliary water-removing appliances associated therewith, including blow boxes for forcing air either radially inwardly or radially outwardly of the second roll, and an auxiliary nip roll for creating a zone of higher compression for mechanical extraction of water from the mat of solid particles between the belt and the second roll. Rewetting of the mat caused by water entrained in th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.