Papermaking process
US5221435A · kind A · utility
112Cited by
6References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1991 |
| Grant date | Jun 22, 1993 |
| Priority date | — |
| Expiry date | Sep 27, 2011 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/67
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
In a papermaking process a paper product is formed from a mineral filler containing cellulosic slurry. Retention performance is provided by the sequential addition of a cationic charge-biasing species, an anionic flocculant, and then a certain microparticle. A shear stage is interposed between the flocculant addition and the microparticle addition. The microparticle is a inorganic, cationic source of aluminum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.