Method for de-inking paper pulp from recycled paper
US6197153A · kind A · utility
4Cited by
15References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1998 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Dec 15, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/64
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The method for de-inking paper pulp produced by the reduction to pulp, with water, of old papers of various qualities according to which a stream of air bubbles (C) is sent through the flow (E.sub.2, S.sub.2, E.sub.3, S.sub.3) of pulp at least once, is characterized by the fact that a countercurrent of water (E.sub.1) is sent into the stream of de-inking air bubbles after said bubbles have passed through the pulp and become laden with ink particles so that the countercurrent releases the particles (fibers, fines, fillers) borne along by these de-inking bubbles and carries them away.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.