Paper production
US4911790A · kind A · utility
8Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1988 |
| Grant date | Mar 27, 1990 |
| Priority date | — |
| Expiry date | Jan 6, 2008 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H23/18
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a process for obtaining retention of the manufacture of paper, whereby one adds a cationic, high polymer polysaccharide at the preparation of a stock of paper pulp; that one adds an anionic aluminium compound, or a combination of an aluminium salt and an alkali or an acid to the formation in situ of such an anionic aluminium compound immediately prior to the head box, whereby pH immediately prior to the head box is kept at pH 7 to 8.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.