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US 10,767,312 B2Granted
Method for producing paper, board or the like
AssigneeKemira Oyj
InventorsKaisa Karisalmi, Tom Lundin, Mikko Virtanen, Antti Laukkanen, Jason McKee
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Abstract
The invention relates to a method for producing paper, board or the like. The method comprises obtaining a thick stock comprising cellulose fibres, forming a fibrous web and drying of drying the fibrous web. A strength agent system, which comprises at least one synthetic or natural polymer, or their mixture, and microfibrillated parenchymal cellulose material originating from non-wood sources, is added to the thick stock. The invention relates also to paper or board produced by the method.
Claims20
A method for producing paper or board, comprising:
- obtaining a thick stock comprising cellulose fibres;
- forming a fibrous web;
- and
- drying the fibrous web,
- wherein
- a strength agent system, comprising at least one synthetic or natural polymer or their mixture and a microfibrillated parenchymal cellulose material originating from non-wood sources is added to the thick stock, and
- wherein a cationic retention polymer, which is a cationic polyacrylamide having an average molecular weight of 4,000,000-18,000 000 Da is added to the stock after the addition of the strength agent system.
4 more elements
Dependencies are inferred from the claim text.