Chemical treatments in bleaching stages which increase pulp brightness
US4238282A · kind A · utility
14Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 23, 1979 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Jul 23, 1999 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/1042
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method for increasing the final brightness of pulp contaminated with iron or manganese in a chlorine bleaching process of the type comprising one or more alkaline stages which comprises treating the pulp with at least 0.1 lbs. per ton of a water-soluble chelating agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.