Application of enzymes and flocculants for enhancing the freeness of paper making pulp
US5169497A · kind A · utility
45Cited by
3References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1991 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Oct 7, 2011 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/455
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process for improving freeness of paper pulp which comprises these steps: PA1 a) Adding to the pulp at least 0.05% based on the dry weight of the pulp, of a cellulolytic enzyme; PA1 b) Allowing the pulp to contact the cellulolytic enzyme for at least 20 minutes at a temperature of at least 20.degree. C.; PA1 c) Adding at least 0.0007% based on the dry weight of the pulp of a water soluble cationic polymer, and then PA1 d) Forming the thus treated pulp into paper.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.