Press section including an extended-nip press with an internally heated center roll
US5810974A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 1996 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | Oct 16, 2016 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21G1/0266
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A press section in a paper machine including a compact combination of rolls which form a number of press nips with one another in which water is removed from a paper web. The paper web has a closed draw supported by a press fabric or by a roll face at least between the nips. The press section includes a center roll in connection with which at least two press nips are formed. The last press nip placed in connection with the center roll is an extended nip. The center roll is a roll provided with a circulation system for a heating medium and a heatable outer mantle. An outer face of the mantle of the center roll is heated by means of the circulation of the heating medium to such a temperature level that the dewatering of the paper web in the press nips arranged in connection with the center roll, in particular in the extended nip, is intensified substantially. The invention can also be accomplished in an environment in which there are two or more separate press nips, of which press nips, at least the last press nip is an extended nip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.