Papermaker's felt incorporating a closed cell polymeric foam layer
US4830905A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1988 |
| Grant date | May 16, 1989 |
| Priority date | — |
| Expiry date | Aug 22, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/682
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A papermaker's felt having improved water extraction characteristics. The felt is composed of a base fabric, and a layer of a closed cell polymeric foam is disposed on a face of the base fabric. A batt of fibrous material is needled to the base fabric and foam layer. The needling operation penetrates the fibers of the batt into the foam layer, intersecting the cells. The resiliency of the foam tends to close the cell walls against the penetrated fibers so that under uncompressed conditions, the felt is substantially impervious. Under compressive forces, as occurs in the nip between press rolls, the interfaces between the penetrated fibers and the cell walls will open to enable water to be extracted through the felt.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.