Method of preparation of a cellulosic pulp, cellulosic pulp...

D - Textiles – Paper – 21 – H

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Details

D21H 17/66 (2006.01) A61L 15/18 (2006.01) A61L 15/28 (2006.01) A61L 15/60 (2006.01) D21C 9/00 (2006.01) D21H 21/22 (2006.01)

Patent

CA 2251866

The invention relates to preparation of cellulosic pulp capable of being defibrated (fluffed) for the manufacture of an absorbent material intended to be incorporated as a component in absorbent products. The invention is characterized therein that a stock of cellulosic fibres in aqueous suspension is pH-adjusted to 4<pH<8, that at least any water-soluble, non-polymeric aluminium salt is added to the stock, said salt in aqueous solution at said pH forming at least any hydrocomplex with aluminium of the type A1(OH)n x, where n is a number between 1 and 3, and x is 0, + or 2+, that said salt in aqueous solution is caused to act on the cellulosic fibres in said suspension at said pH during a period of time of at least 2min, and that the fibre pulp thereafter is formed to a web, which is dewatered and dried. The invention also relates to the prepared cellulose pulp as such and to its use in absorbent products.

L'invention concerne la préparation de pâte cellulosique que l'on peut défibrer (sous forme de pâte fluff) pour fabriquer un matériau absorbant conçu pour être incorporé en tant que constituant dans des produits absorbants. L'invention se caractérise en ce que l'on règle le pH d'une suspension aqueuse de pâte de fibres cellulosiques, afin que celui-ci soit supérieur à 4 et inférieur à 8, en ce que l'on ajoute à cette suspension de pâte au moins un sel d'aluminium non polymère, hydrosoluble, lequel sel, introduit dans la solution aqueuse possédant ledit pH, forme au moins un complexe hydrique avec l'aluminium, du type Al(OH)n<X>, dans lequel n est un nombre compris entre 1 et 3 et x vaut 0, + ou 2+, en ce que, dans cette suspension aqueuse présentant le pH ci-dessus, l'on fait agir ce sel sur les fibres cellulosiques présentes, pendant une période d'au moins deux minutes, et en ce que l'on forme ensuite avec cette pâte de fibres une nappe, que l'on essore et sèche. L'invention concerne également la pâte de cellulose préparée de cette manière ainsi que l'utilisation de celle-ci dans des produits absorbants.

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