Four stage alkaline peroxide mechanical pulpings
US8048263B2 · kind B2 · utility
10Cited by
18References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2010 |
| Grant date | Nov 1, 2011 |
| Priority date | — |
| Expiry date | Mar 26, 2030 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21C9/163
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for applying chemicals, such as an alkaline peroxide pretreatment (1) to lignocellulosic material before chemical refining and at the primary refiner (3). The preferred embodiment comprises (i) preconditioning at temperatures below 95° C., especially below 80° C., (ii) limiting the time and/or temperature in the refiner, (iii) reaction quench to maintain temperatures below 80° C., and (iv) subsequent high consistency bleaching (4).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.