Method of producing high dry strength paper and cardboard...

Details Method of producing high dry strength paper and cardboard... Method of producing high dry strength paper and cardboard...

D - Textiles, Paper

21

H

D21H 21/18 (2006.01) D21H 17/42 (2006.01) D21H 17/45 (2006.01)

Patent

CA 2594856

The invention relates to a method of producing a sheet of paper and/or cardboard and similar. According to the invention, prior to the formation of the sheet, at least two dry strength agents are added to the pulp suspension either separately in any order or mixed together and at one or more injection points, namely: a first agent corresponding to a product for Hofmann degradation in solution on a (co)polymer (hereafter referred to as a base (co)polymer) comprising at least one non-ionic monomer which is selected from the group containing acrylamide and/or methacrylamide, N,N dimethylacrylamide and/or acrylonitrile; and a second agent corresponding to a (co)polymer having an anionic charge density greater than 0.1 meq/g. The invention is characterised in that the Hofmann degradation product is an organic polymer produced at a concentration greater than 3.5 % by weight, and preferably greater than 4.5 %, and in that the first and second agents are each introduced into the pulp suspension at a concentration of between 0.01 and 2 % by weight of active polymer material in relation to the dry weight of the pulp suspension.

Procédé de fabrication d'une feuille de papier et/ou de carton et analogues, selon lequel, avant formation de ladite feuille, on ajoute à la suspension fibreuse, séparément ou en mélange, dans un ordre quelconque d'introduction, en un ou plusieurs points d'injection, au moins deux agents de résistance à sec respectivement : un premier agent correspondant à un produit de dégradation d'Hofmann en solution sur un (co)polymère (désigné dans la suite de la description « (co)polymère base ») comprenant au moins un monomère non ionique choisi dans le groupe comprenant l'acrylamide et/ou le méthacrylamide, le N,N diméthylacrylamide et/ou Facrylonitrile, et un second agent correspondant à un (co)polymère ayant une densité de charge anio nique supérieure à 0,1 meq/g, caractérisé en ce que le produit de dégradation d'Hofmann est un polymère organique produit à une concentration supérieure à 3,5% en poids, de préférence supérieure à 4,5%, et en ce que les premier et second agents sont introduits dans la suspension fibreuse à raison de 0,01 à 2% chacun en poids de matière active polymère par rapport au poids sec de la suspension fibreuse.

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