Method for the production of paper, paperboard, and cardboard

Details Method for the production of paper, paperboard, and cardboard Method for the production of paper, paperboard, and cardboard

D - Textiles, Paper

21

H

D21H 23/18 (2006.01) D21H 21/10 (2006.01) D21H 17/37 (2006.01) D21H 17/45 (2006.01) D21H 17/68 (2006.01)

Patent

CA 2494648

Disclosed is a method for producing paper, paperboard, and cardboard by shearing the paper material, adding a microparticle system made of cationic polymers and a fine-particle inorganic component to the paper material following the last shearing step before agglomerating the material, dewatering the paper material so as to form sheets, and drying said sheets. Cationic polyacrylamides, polymers containing vinylamine units, and/or poly diallyl dimethyl ammonium chloride, each of which has an average molar weight Mw of at least 500,000 Dalton and a maximum charge density of 4.0 meq/g, is/are used as cationic polymers.

La présente invention concerne un procédé pour produire du papier, du carton-pâte et du carton. Ce procédé consiste à découper de la pâte à papier, à ajouter à la pâte à papier un système de microparticules constitué d'un polymère cationique et d'un composant inorganique à fines particules après la dernière étape de découpage, avant la caisse de tête, à déshydrater la pâte à papier en formant des feuilles, puis à sécher les feuilles. Les polymères cationiques du système de microparticules utilisés sont des polyacrylamides cationiques, des polymères renfermant des unités vinylamine et/ou du chlorure de polydiallyldiméthylammonium présentant respectivement une masse molaire moyenne M<SB>W</SB> supérieure ou égale à 500 000 daltons et une densité de charge inférieure ou égale à 4,0 meq./g.

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