Controllable filler prefloculation using a dual polymer system

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 17/67 (2006.01) D21H 17/68 (2006.01) D21H 17/69 (2006.01) D21H 21/10 (2006.01) D21H 21/18 (2006.01)

Patent

CA 2755515

A method of preparing a stable dispersion of flocculated filler particles for use in papermaking processes comprises sequential addition of a first flocculating agent to an aqueous dispersion of filler particles followed by shearing of the dispersion, followed by addition of a second flocculating agent to the dispersion and further shearing of the resultant filler flocs to the desired particle size resulting in shear resistant filler flocs with a defined and controllable size distribution. In addition, a neutralizing coagulant can be added to the dispersion to partially or completely neutralize the charge of the filler before the first flocculating agent is added

L'invention porte sur un procédé de préparation d'une dispersion stable de particules de charge floculées destinées à être utilisées dans des procédés de fabrication de papier, lequel procédé consiste à ajouter séquentiellement un premier agent de floculation à une dispersion aqueuse de particules de charge, puis à cisailler la dispersion, puis à ajouter un second agent de floculation à la dispersion, et, en outre, à cisailler les flocons de charge résultants à la taille de particule désirée, produisant en résultat des flocons de charge résistants au cisaillement avec une distribution de taille définie et contrôlable. De plus, un coagulant de neutralisation peut être ajouté à la dispersion pour neutraliser partiellement ou complètement la charge de la charge avant que le premier agent de floculation ne soit ajouté.

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