Production of paper and paperboard
US4753710A · kind A · utility
198Cited by
5References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1987 |
| Grant date | Jun 28, 1988 |
| Priority date | — |
| Expiry date | Jan 27, 2007 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Paper or paper board is made by passing an aqueous cellulosic suspension through a centriscreen or other shear device and then draining the purified suspension, and an improved combination of retention, drainage, drying and formation is achieved by adding to the suspension an excess of high molecular weight linear synthetic cationic polymer before shearing the suspension and adding bentonite after shearing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.