Process for the production of paper, board and cardboard...

Details Process for the production of paper, board and cardboard... Process for the production of paper, board and cardboard...

D - Textiles, Paper

21

H

D21H 17/42 (2006.01) D21H 17/44 (2006.01) D21H 21/18 (2006.01)

Patent

CA 2722237

Method for producing paper, paperboard and cardboard with a high dry strength through the separate addition of a water-soluble cationic polymer and an aqueous dispersion of a water-insoluble polymer with an acid group fraction of no more than 10 Mol-% or an anionically adjusted aqueous dispersion of a non-ionic polymer to a paper pulp, dewatering the paper pulp and drying the paper product. It is preferable for the polymers to be added to a paper pulp that has a temperature of at least 40 °C.

L'invention concerne un procédé de production de papier, de carton-pâte, et de carton présentant une résistance à sec élevée, par ajout séparé, à une pâte à papier, d'un polymère cationique hydrosoluble et d'une dispersion aqueuse d'un polymère non hydrosoluble présentant une teneur en groupes acide inférieure ou égale à 10 %mol ou d'une dispersion aqueuse anionique d'un polymère non ionique; par égouttage de ladite pâte à papier, et par séchage des produits en papier. De préférence, les polymères sont ajoutés à une pâte à papier qui présente une température d'au moins 40°C.

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