Method of making sanitary paper products from recycled...

D - Textiles – Paper – 21 – H

Patent

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D21H 21/24 (2006.01) D21B 1/32 (2006.01) D21C 5/02 (2006.01) D21F 11/14 (2006.01) D21H 11/14 (2006.01) D21H 27/16 (2006.01)

Patent

CA 2270424

A method of making sanitary paper products from recycled newspapers. The method includes the steps of: (a) pulping newspapers in water with agitation to produce a pulp slurry, the pulp from the newspapers having an average fines content of greater than about 40 % and a Canadian Standard Freeness of less than about 250; (b) washing the pulp, whereby the fines content is reduced to less than about 35 % and the Canadian Standard Freeness is increased to more than about 300; (c) introducing the treated pulp at a papermaking consistency into the headbox of a paper making machine; (d) adding from about 0.01 % to about 1.5 % of a surfactant system to the treated pulp; and (e) utilizing the treated pulp in a paper making process to produce sanitary paper products.

On décrit un procédé de production de papier hygiénique à partir de journaux recyclés. Le procédé de cette invention comprend les étapes suivantes: (a) on réduit en pâte les journaux dans de l'eau en les agitant pour produire une pâte à papier, la pâte provenant des journaux ayant une teneur moyenne en fines supérieur à environ 40 % et se caractérisant par un indice d'égouttage inférieur à environ 250; (b) on lave la pâte, ceci ayant pour effet de réduire la teneur en fines à moins d'environ 35 % et d'augmenter l'indice d'égouttage à plus d'environ 300; (c) on introduit dans la caisse de tête d'une machine de fabrication de papier la pâte traitée qui a une consistance appropriée à la fabrication de papier; (d) on ajoute dans la pâte traitée entre environ 0,01 % et environ 1,5 % d'un système de tensio-actif; et (e) on utilise la pâte traitée dans un processus de fabrication de papier pour produire du papier hygiénique.

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