Manufacture of paper and paperboard
US6406593B1 · kind B1 · utility
14Cited by
10References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2000 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Nov 2, 2020 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A process of making paper or paper board comprising forming a cellulosic suspension, flocculating the suspension, mechanically shearing the suspension and optionally reflocculating the suspension, draining the suspension on a screen to form a sheet and then drying the sheet,wherein the suspension is flocculated or reflocculated by introducing a water-soluble polymer of intrinsic viscosity above 3 dl/g into the suspension, characterized in that the water soluble polymer exhibits a rheological oscillation value of tan delta at 0.005 Hz of above 1.1. The process has the advantage of improving retention.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.