Method for producing pulp and paper with calcium carbonate...

Details Method for producing pulp and paper with calcium carbonate... Method for producing pulp and paper with calcium carbonate...

D - Textiles, Paper

21

H

D21H 17/67 (2006.01) D21C 9/00 (2006.01) D21H 17/64 (2006.01)

Patent

CA 2324459

A method is described for attaining high levels of loading of calcium carbonate fillers in the lumens of wood pulp fibres. The pulp is pretreated with a cationic polymer prior to being impregnated with the filler. Different conditions of pH and temperature are specified depending on whether the filler is a precipitated calcium carbonate or a ground calcium carbonate. The lumen- loaded pulps are used to make novel products with advantages in higher filler retention and sheet strength over conventionally made papers.

On décrit un procédé qui permet d'obtenir des niveaux élevés de chargement de carbonate de calcium dans le lumen de fibres de pâte de bois. La pâte est prétraitée avec un polymère cationique avant d'être imprégnée avec la charge. Différents états de pH et conditions de température sont précisés selon que la charge est un carbonate de calcium précipité ou un carbonate de calcium moulu. Les pâtes à lumen chargé sont utilisées pour fabriquer de nouveaux produits présentant de meilleures qualités de rétention de la charge et de résistance du papier par rapport au papier fabriqué par des procédés classiques.

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