Method for drying a porous web in an extended nip press
US4506456A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 1983 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Mar 16, 2003 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F3/0209
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for drying a porous web, according to which method the wet web is passed onto at least one drying felt, the web and the drying felt are subjected to an air removal treatment, and the web and the drying felt are passed between two surface elements which are impermeable to liquid and form an extended press zone in which the web is subjected to a pressing effect from both sides. Before the press zone the wet web is heated to a temperature of at least nearly 100.degree. C., and in the press zone the drying felt is kept at a temperature lower than the temperature of the wet web, so that a lower pressure is produced in the drying felt, and the high temperature of the water in the web causes an explosive evaporation and transfer of water from the web into the felt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.