Device for dewatering of a paper web including prepressing with extended nip shoe
US5611893A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1995 |
| Grant date | Mar 18, 1997 |
| Priority date | — |
| Expiry date | Jan 24, 2015 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F3/045
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Method and device in the manufacture of paper or board for dewatering of a paper web that is being manufactured. The paper web is transferred from a forming wire onto a wire in the drying section while constantly on support of a fabric that receives water, a transfer fabric, or of any other, corresponding transfer surface as a closed draw, at a particularly high speed, which is higher than about 25-30 m/s. Dewatering of the paper web is carried out by means of at least two subsequent press nips, of which nips at least one press nip is a so-called extended-nip zone, whose length in a machine direction is larger than about 100 mm. The extended-nip zone is formed in connection with a mobile flexible press-band loop. The distribution of the compression pressure employed within said extended-nip press zone is regulated and/or selected both in the transverse direction of the web and in the machine direction so as to set or to control the different profiles of properties of the web.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.