Refining process for paper pulp using a silica sol
US5225041A · kind A · utility
36Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1992 |
| Grant date | Jul 6, 1993 |
| Priority date | — |
| Expiry date | Jan 31, 2012 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21D1/20
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A refining process for paper pulp in which colloidal silica sol is mixed with the paper pulp to be refined. The addition of the colloidal silica sol reduces the time necessary to refine the pulp to a predetermined freeness value compared to refining in the absence of the colloidal silica sol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.