Method for defibrating waste paper and dispersing contaminants
US4312701A · kind A · utility
16Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 7, 1980 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Nov 7, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/64
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for defibrating waste paper and dispersing contained asphalt and wax contaminants within the fibers. The waste paper is initially pulped with water and the resulting stock is then contacted with a high pressure stream of steam having a velocity in the range of 1200 to 1600 ft./sec. The mixture of steam and stock is passed through a mixing tube under highly turbulent conditions to defibrate the waste paper and disperse any asphalt, waxes, and other contaminants throughout the separated fibers. The resulting stock can be used in papermaking processes, particularly for the production of paperboard products.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.