Process for the manufacture of paper
US5496440A · kind A · utility
24Cited by
13References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1994 |
| Grant date | Mar 5, 1996 |
| Priority date | — |
| Expiry date | Jan 3, 2014 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/64
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for improved dewatering and retention in the manufacture of paper, where a retention agent containing anionic groups and being based on a polysaccharide or being an acrylamide-based polymer and an alkaline solution of an aluminate are added to the stock containing lignocellulose-containing fibres and optionally fillers. The pH of the stock prior to the addition of the aluminate should be below about 7 to obtain the desired cationic aluminum hydroxide complexes in the stock. The present process 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.