Press section employing an extended nip press with suction counter roll
US5868904A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 1997 |
| Grant date | Feb 9, 1999 |
| Priority date | — |
| Expiry date | May 6, 2017 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F3/04
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A press section of a paper making machine for dewatering a paper web (W) formed in a preceding forming section in which dewatering felts (11, 28) are applied to both surfaces of the paper web (W) as the paper web (W) travels in a closed draw from the forming section through a first extended nip press (NP.sub.1), thereby drawing a substantial amount of water simultaneously and symmetrically from both surfaces of the paper web (W). The upper felt (11) transports the paper web (W) from the first extended nip (NP.sub.1) to a smooth surfaced center roll (30) where the paper web (W) passes through at least one roll nip (N.sub.1, N.sub.2) or extended nip (NP.sub.2 ', NP.sub.3 '). The center roll (30) is positioned at an elevation higher than the first extended nip (NP.sub.1) thereby reducing the length of the press section. In a second roll nip (N.sub.2), a press fabric (33) is substituted for the upper felt (11) to efficiently remove additional water. Additional extended or roll nips (NP.sub.2, N.sub.3, N.sub.0, N.sub.E) may be interposed between the center roll (30) and the succeeding drying section, between the forming section and the first extended nip (NP.sub.1), or between the first…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.