Method and an apparatus for drying a paper web or the like
US4887362A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 22, 1988 |
| Grant date | Dec 19, 1989 |
| Priority date | — |
| Expiry date | Jan 22, 2008 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F5/004
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to a method and an apparatus for drying a paper web or the like. In the invention the web to be dried is transferred on a felt between bands moving around as an endless loop. The band making contact with the web is heated by means of a steam chamber, and the band making contact with the felt is supported and cooled within the area of the steam chamber by means of supporting and cooling means. For providing a rapid compensation of pressure differences, the supporting and cooling means is formed by a hydrostatic plate comprising a plurality of pressure pockets and return conduits separated from each other by means of ridges. Water is fed into the pressure pockets so that it enters the return conduits over the ridges. The pressure of the return conduits is adjusted on the basis of the pressure of the steam contained in the steam chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.