Apparatus and process for forming a laid fibrous web
US4666647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1985 |
| Grant date | May 19, 1987 |
| Priority date | — |
| Expiry date | Dec 10, 2005 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F11/006
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Apparatus and process for forming a laid fibrous article includes a foraminous forming surface for depositing thereon of fibers under the influence of a pressure differential imposed on the surface, wherein the improvement comprises the provision of a concavely contoured portion of the forming surface to yield a non-stepwise gradation in basis weight of the laid fibrous article. The concavely contoured surface portion is bounded by walls defining angles of from about 45.degree. to 68.degree., whereby the laid fibrous article is readily removable from the forming surface, which may comprise the cylindrical surface of a rotating drum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.