Web-forming method in a paper machine
US4744866A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1986 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Mar 17, 2006 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F9/003
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A web-forming method is applied in a paper machine. The web-forming section which includes a lower wire loop having an initial single-wire run and dewatering zone in which the web is dewatered through and an upper wire loop having a joint run with a subsequent run of the lower wire to form a two-wire dewatering zone within which dewatering takes place substantially through the upper wire. A first open faced forming roll is situated within the upper wire loop so that the two-wire dewatering progress begins upwardly in the region of the first forming roll. A forming shoe within the lower wire loop has a curved deck whose center of curvature is situated on the side of the lower wire loop and further guides the joint run of the upper and lower wires in the two-wire dewatering zone. A second forming roll situated within the lower wire loop after the forming shoe guides the joint run of the upper and lower wires over a downwardly curved sector thereof. According to the method, initial dewatering occurs in the single-wire dewatering zone through the lower wire. In the two-wire dewatering zone, within the range of the first and second forming rolls and the forming shoe situated therebetwee…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.