Process for the production of paper
US5512135A · kind A · utility
20Cited by
8References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1994 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Jan 3, 2014 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a process for improved dewatering and retention in the production of paper, where an anionic retention agent based on starches, cellulose derivatives or guar gums having no cationic groups and an acidic solution of an aluminum compound are added to the stock containing lignocellulose-containing fibres and optionally fillers. The pH of the stock prior to the addition of the aluminium compound should be at least about 6 to obtain the desired cationic aluminium hydroxide complexes in the stock. The present invention is cost effective and insensitive to the content of calcium in the white water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.