Method for bleaching chemical paper pulps by final ozone treatment at high temperature
US8268120B2 · kind B2 · utility
1Cited by
5References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2007 |
| Grant date | Sep 18, 2012 |
| Priority date | — |
| Expiry date | Jan 4, 2028 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/153
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for treating a prebleached chemical pulp including a step of ozone treatment of the pulp, carried out at a temperature above 60° C., advantageously above 65° C. and even more advantageously above or equal to 70° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.