Production of paper and paper board
US6063240A · kind A · utility
4Cited by
4References
12Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 28, 1997 |
| Grant date | May 16, 2000 |
| Priority date | — |
| Expiry date | Nov 28, 2017 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/30
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Paper or paper board is made by adding cationic polymeric retention aid to a cellulosic supension, shearing the suspension to degrade the resultant flocs, aggregating the suspension by adding an aqueous composition of bentonite or other anionic bridging coagulant in the presence of anionic dye, pigment or optical brightening agent, and forming paper from the aggregated suspension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.