Impregnating a fibrous web with liquid
US4208230A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 27, 1978 |
| Grant date | Jun 17, 1980 |
| Priority date | — |
| Expiry date | Nov 27, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/33
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A moving, fibrous web is impregnated with a liquid by placing the liquid on the surface of the web, spreading the liquid over the web surface, pressuring a portion of the liquid into the web to partially saturate the web with the liquid and leave residual liquid on the web, and metering the residual liquid into a layer of substantially uniform thickness. This layer is then forced into the web to saturate it with liquid. This method is particularly effective for producing plastic pipe incorporating at least one layer of fibrous material saturated with liquid resin . Apparatus for practicing this method comprises a first surface transverse to the surface of the web, and a second surface converging with the web in the direction of travel of the web. The first surface performs the spreading step and the second surface performs the pressuring and metering steps. There are a plurality of projections of substantially uniform height on the trailing edge of the second surface to insure that the residual liquid is metered into a layer of substantially uniform thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.