Apparatus with a long press zone in the press treatment of a web
US4568423A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1983 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Oct 13, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB30B9/24
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Apparatus for the press treatment of a fiber web in a long or extended press zone includes a first press fabric loop in which a press roll is situated and a press shoe situated within a press belt loop which acts in opposition to the press roll, the latter being supported on a transverse beam. The press roll and press shoe together form an extended press zone through which the web to be pressed is guided. The press shoe includes a pressure chamber isolated from the external environment by sealing members and to which a pressure medium, such as a fluid under pressure, is passed. The pressure chamber acts within the extended press zone on the press belt. According to the invention, the pressure chamber of the press shoe comprises a hydrostatic pressure chamber which, when viewed in the direction of web run, is bounded at its front and rear by hydrodynamic press shoes which function both as sealing elements for the hydrostatic pressure chamber and, additionally, as press-shoe members which produce compression pressures on the press belt and on the web.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.