Press roll and press in a paper making machine
US4559106A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 1984 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | May 8, 2004 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F3/086
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A press roll in a paper making machine comprises a non-perforated inner frame onto which an elastic layered structure is applied, the layered structure including an inner layer having a volume of which a substantial portion is constituted by cavities and an outer layer adapted to act against the inner surface of a looped press felt which passes through the press nip, the outer layer having passages formed therethrough which communicate with the cavities of the inner layer. During operation, the cavities are compressed together and thereby widen or extend the nip zone and, additionally, the cavities act as suction devices to produce a negative pressure in the nip zone following the centerline thereof. A press is disclosed which is formed by the press roll described above and a counter-roll which is provided with an elastic coating and a hollow face. A pair of press felts pass through the nip zone formed by these rolls between which the web to be dewatered is passed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.