Elimination of alum yellowing of aspen thermomechanical pulp through pulp washing
US7018509B2 · kind B2 · utility
8Cited by
9References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2002 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Jul 2, 2023 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/1031
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to an improved process for manufacturing bleached thermomechanical aspen pulp having reduced yellow after treatment with aluminum based chemicals such as alum which are used in paper making processes. In this improved process the pulp is washed prior to, after or between the bleaching stages or a combination of the foregoing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.