High-efficiency strength program used for making paper in higher charge demand system
US10982391B2 · kind B2 · utility
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24References
18Claims
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Key dates
| Filing date | May 31, 2017 |
| Grant date | Apr 20, 2021 |
| Priority date | — |
| Expiry date | Aug 12, 2037 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/74
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of enhancing paper strength properties is provided. The method comprises treating a paper sheet precursor with a polyaluminum salt, and a strengthening agent, wherein the strengthening agent comprises a dialdehyde-modified polyacrylamide copolymer and a polyacrylamide copolymer. The polyaluminum salt may be polyaluminum chloride. The methods have been demonstrated to provide, among other things, improvements in retention, strength, and dewatering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.