Manufacture of paper and paperboard

D - Textiles – Paper – 21 – H

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Details

D21H 23/76 (2006.01) D21H 17/42 (2006.01) D21H 17/44 (2006.01) D21H 17/66 (2006.01) D21H 17/67 (2006.01) D21H 17/68 (2006.01) D21H 21/10 (2006.01) D21H 17/43 (2006.01) D21H 23/14 (2006.01)

Patent

CA 2388973

A process of making paper or paper board comprising forming a cellulosic suspension, flocculating the suspension, draining the suspension on a screen to form a sheet and then drying the sheet, characterised in that the suspension is flocculated using a flocculation system comprising a siliceous material and an anionic branched water soluble polymer that has been formed from water soluble ethylenically unsaturated anionic monomer or monomer blend and branching agent and wherein the polymer has (a) intrinsic viscosity above 1.5 dl/g and/or saline Brookfield viscosity of above about 2.0 mPa.s and (b) rheological oscillation value of tan delta at 0.005 Hz of above 0.7 and/or (c) deionised SLV viscosity number which is at least three times the salted SLV viscosity number of the corresponding unbranched polymer made in the absence of branching agent.

Ce procédé de fabrication de papier ou de carton comprend les étapes suivantes consistant à former une suspension cellulosique, à faire floculer cette suspension, à égoutter cette suspension sur un tamis de façon à former une feuille, puis à sécher cette feuille. Ce procédé est caractérisé en ce que l'on fait floculer la suspension au moyen d'un système de floculation comprenant un matériau siliceux et un polymère hydrosoluble, ramifié, anionique, que l'on a formé à partir d'un monomère anionique à insaturation éthylénique, hydrosoluble, ou d'un mélange de monomères, et d'un agent de ramification, et en ce que le polymère possède les propriétés suivantes: (a) une viscosité intrinsèque supérieure à 1,5 dl/g et/ou une viscosité Brookfield saline supérieure à 2,0 mPa.s environ, (b) une valeur d'oscillation rhéologique de tangente delta à 0,005 Hz supérieure à 0,7 et/ou une viscosité Brookfield saline, désionisée représentant au moins trois fois la viscosité Brookfield saline, salée, du polymère non ramifié correspondant, effectuée en l'absence de l'agent de ramification.

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