Method of producing paper, paperboard and cardboard

Details Method of producing paper, paperboard and cardboard Method of producing paper, paperboard and cardboard

D - Textiles, Paper

21

H

D21H 17/22 (2006.01) D21H 17/54 (2006.01) D21H 21/10 (2006.01) D21H 21/18 (2006.01) D21H 21/22 (2006.01)

Patent

CA 2382672

The invention relates to a method of producing paper, paperboard and cardboard by dewatering a paper material in the presence of condensation products of basic amino acids and sheet forming. The inventive method especially uses homo- and co-condensation products of lysine and the cross-linked condensation products obtained therefrom by reaction with cross-linking agents in an amount of from 0.01 to 5 wt.- % based on the dry paper material to increase the dry and wet strength and the absorbency of paper. These materials are also used to fixate anionic dyes and interfering substances in the paper, to increase the dewatering rate and the retention and the efficacy of synthetic anionic and cationic retention agents in the production of paper, paperboard and cardboard by dewatering the paper material and sheet forming.

L'invention concerne un procédé de production de papier, carton-pâte et carton par égouttage de la pâte à papier en présence de condensats d'aminoacides basiques et formation de feuille. Selon ce procédé, on utilise en particulier des homocondensats et des cocondensats de lysine ainsi que les condensats réticulés, obtenus à partir de ces derniers, par réaction avec des réticulants, dans des proportions comprises entre 0,01 et 5 % en poids, par rapport à la pâte à papier sèche, en tant qu'agents pour augmenter la résistance à sec et à l'humidité ainsi que le pouvoir absorbant du papier, pour fixer des colorants anioniques et des matières perturbatrices dans le papier, pour augmenter la vitesse d'égouttage et la rétention ainsi que l'efficacité d'agents de rétention anioniques et cationiques synthétiques lors de la production de papier, carton-pâte et carton par égouttage d'une pâte à papier et formation de feuille.

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