Process for preparing a bleached chemithermomechanical pulp
US5338402A · kind A · utility
6Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1992 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Oct 6, 2012 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/222
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for preparing chemithermomechanical pulp comprising subjecting a lignocellulosic substance from which said pulp is to be formed to the simultaneous action of a sulfite and a reducing agent that is more electronegative than the sulfite ion during a nondestructive cooking operation at a temperature of about 100.degree. C. or above under saturated steam pressure; said simultaneous action taking place at an initial pH of between 7 and 12.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.