Process for the manufacture of a permeable sheet-like fibrous structure
US4978489A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | May 31, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/251
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for the manufacture of a stiff permeable sheet-like fibrous structure which includes forming a web with 20% to 60% single fibres having a high modulus of elasticity (as herein defined) and between 7 and 50 millimeters long, and 40% to 60% by weight of a wholly or substantially unconsolidated particulate plastics material, and then treating the web by heating to melt the plastics material and passing it between a pair of nip rollers so that the plastics material can flow and wet out the fibres, the nip between the rollers being set to a dimension less than the thickness of the unconsolidated web and greater than that of the web if it were to be fully consolidated, and allowing the web to expand and remain substantially permeable after passing through the rollers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.