Forming of a paper or board web in a twin-wire former or in a twin-wire section of a former
US7364643B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2003 |
| Grant date | Apr 29, 2008 |
| Priority date | — |
| Expiry date | Mar 26, 2024 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F1/52
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Fibrous stock is supplied by a paper or board machine headbox (1) between looped forming wires (11, 12). Water is removed in a first dewatering zone (Z1) formed with a fixed forming shoe (3) having a curved surface against which a wire (12) is supported while the opposite wire (11) is unsupported in the area of the shoe (3). Water is removed in a second dewatering zone (Z2) formed by fixed dewatering blades (21) on the other side of the wires (11, 12) and supported against the stock therebetween (21) and on the opposite side of the wires (11, 12) by dewatering blades (24), loaded in a controlled manner against the fixed dewatering blades (21) at gaps (22) between these so that pulsating dewatering is caused in the second zone (Z2). The wires (11, 12) are guided so the shoe (3) causes essentially non-pulsating dewatering in the stock.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.