Method and apparatus for treating cellulosic products
US4343840A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1981 |
| Grant date | Aug 10, 1982 |
| Priority date | — |
| Expiry date | Feb 27, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB27K3/0285
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for impregnating low density fiberboard with asphalt is disclosed, and which includes stacking the sheets, placing the stacks in a sealable chamber, and flooding the chamber with a treating solution composed of a mixture of asphalt and solvent. The chamber is thereafter drained, and the fiberboard is then heated by the injection of live steam into the chamber. A partial vacuum is then drawn in the chamber, while condensing and separating the withdrawn solvent and water vapors. Both the condensed solvent and water of the steam injection system are maintained in closed conduit systems to permit their reuse and to prevent contamination of the environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.