Lumen loading of mineral filler into cellulose fibers for...

D - Textiles – Paper – 21 – H

Patent

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D21H 17/67 (2006.01) D21H 17/28 (2006.01) D21H 17/29 (2006.01) D21H 21/10 (2006.01) D21H 23/04 (2006.01)

Patent

CA 2280043

A method of introducing and retaining particles of mineral filler inside the lumens of wood pulp fibers is disclosed. The fillers are mixed with a high- consistency pulp slurry so that a portion of the total filler diffuses inside the lumens. The loaded fiber is treated with a chemical flocculating agent that exhibits a higher chemical affinity for the filler than for the fiber. The flocculated filler particles are prevented from diffusing outside the lumens. At equal filler loading levels, paper formed according to the lumen loading process of this invention exhibits superior mechanical strength than paper prepared in a conventional manner.

La présente invention concerne un procédé d'introduction et de retenue de particules de charge minérale à l'intérieur des lumières des fibres de pâte de bois. Les charges sont mélangées à une suspension dense de pâte à concentration élevée, de manière qu'une partie de la charge totale se répande à l'intérieur de la lumière. La fibre chargée est traitée avec un agent de floculation chimique qui présente une affinité chimique plus élevée vis-à-vis de la charge que vis-à-vis de la fibre. Les particules de charge floculées ne peuvent pas se répandre en dehors de la lumière. A des niveaux de charge égaux, le papier réalisé conformément au processus de charge de la lumière de cette invention, présente une résistance mécanique supérieure à celle du papier préparé selon un procédé classique.

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