Process for manufacturing paper or cardboard
US12195920B2 · kind B2 · utility
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1References
18Claims
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Assignee
Inventors
Key dates
| Filing date | May 7, 2020 |
| Grant date | Jan 14, 2025 |
| Priority date | — |
| Expiry date | Jan 16, 2041 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H21/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
This invention relates to a method for manufacturing a sheet of paper or cardboard, according to which, before forming said sheet, at least one N-vinylformamide polymer that is partially hydrolyzed in the form of an inverse emulsion is added, at one or more injection points, to a fibrous suspension in the presence of an anti-gelling agent, and having a cationic regain between 30 and 150%, the inverse emulsion having a weight ratio of partially hydrolyzed N-vinylformamide polymer to anti-gelling agent in the range between 1,000,000/5000 and 1,000,000/50,000.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.