Conversion of pulp and paper mill waste solids to a papermaking filler product
US5332474A · kind A · utility
17Cited by
8References
11Claims
0Family size
Inventor
Key dates
| Filing date | Jan 19, 1993 |
| Grant date | Jul 26, 1994 |
| Priority date | — |
| Expiry date | Jan 19, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S162/09
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for the production of a papermaking filler product from the fiber fines/clay fraction of a pulp, paper, paperboard, or deinking mill waste solids such process comprising the reaction of said solids with sufficient acid to lower and maintain a pH of less than 5.0. Such process yields improvement in the drainage characteristics of the material. Bleach can be added or the pH raised back to neutral to further improve the specific resistance and/or brightness of the material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.