Method of producing high yield chemimechanical pulps
US4116758A · kind A · utility
15Cited by
15References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1977 |
| Grant date | Sep 26, 1978 |
| Priority date | — |
| Expiry date | Oct 3, 1997 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C3/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for producing high yield chemimechanical pulps from woody lignocellulosic material, such as wood chips, whereby the material is treated with an aqueous solution of a mixture of sulfite and bisulfite, said solution being of sufficient strength to sulfonate said material to at least about 85% of the maximum level of sulfonation that can be achieved on said material without reducing the pulp yield to below 90% and subjecting the resulting sulfonated material to mechanical defibration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.