Process for producing paper and cardboard

Details Process for producing paper and cardboard Process for producing paper and cardboard

D - Textiles, Paper

21

H

D21H 23/14 (2006.01) D21H 17/29 (2006.01) D21H 17/37 (2006.01) D21H 17/45 (2006.01) D21H 17/56 (2006.01) D21H 17/68 (2006.01)

Patent

CA 2258569

Paper and cardboard are produced by draining pulps, with sheet formation and drying of the sheets, by a process in which first (a) polyethyleneimines having a molar mass M w of more than 500,000 or polymers containing vinylamine units and having a molar mass of from 5000 to 3 million and then (b) cationic polyacrylamides or polymers containing vinylamine units, the molar masses M w of the polymers each being at least 4 million, are added to the pulps, and the pulp is then subjected to at least one shearing stage and is flocculated by adding bentonite, colloidal silica or clay.

Procédé de fabrication de papier et de carton par déshydratation de la pâte à papier, avec formation de feuilles et séchage de celles-ci, selon lequel on ajoute à la pâte à papier, tout d'abord a) des polyéthylèneimines de masse molaire Mw supérieure à 500 000 ou des polymères renfermant des motifs vinylamines, de masse molaire de 5000 à 3 millions, puis b) des copolymères renfermant des motifs polyacrylamides cationiques ou vinylamines, les masses molaires Mw des polymères s'élevant à chaque fois à au moins 4 millions, et on soumet ensuite la pâte à papier à au moins une étape de cisaillement et à une floculation par addition de bentonite, d'acide silicique colloïdal ou d'argile.

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