Multi-stage AP mechanical pulping with refiner blow line treatment
US8216423B2 · kind B2 · utility
10Cited by
20References
33Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 26, 2010 |
| Grant date | Jul 10, 2012 |
| 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
The invention combines the step of adding chemicals such as alkaline peroxide to an intermediate line after refining, with the step of applying chemicals such as alkaline peroxide as a pre-treatment before primary refining and/or applying chemicals such as alkaline peroxide at the primary refiner. This is implemented in the preferred embodiment, by pre-treating feed material, refining the materials into a pulp in a superatmospheric refiner, and adding chemicals in the post refining blowline.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.