Manufacture of fiberboard according to the wet method with closed backwater system
USRE29770E · kind E · reissue
Assignees
Inventors
Key dates
| Filing date | Aug 15, 1977 |
| Grant date | Sep 19, 1978 |
| Priority date | — |
| Expiry date | Aug 15, 1997 |
Classification
- Technology area (CPC —)General
Abstract
An improved method for the manufacture of wood fiberboard according to the wet system with a closed white water system includes the steps of drying the incoming lignocellulose containing material, prior to the dilution step, to a dryness, or solid consistency, which is higher than the dryness of the wet lap or sheet before final drying to produce the fiberboard product. Formaldehyde is added to the resulting white water which is homogenized to atomize occurring precipitations through efficient agitation and dispersion prior to being recirculated for use for diluting the incoming fiber material. Thus, there is obtained an efficient closed white water system which results in a reduction of environmentally harmful discharge of polluted water as well as the production of fiberboard with enhanced appearance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.