Method for the production of paper, cardboard and card

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

D - Textiles, Paper

21

H

D21H 21/10 (2006.01)

Patent

CA 2589653

A method for the production of paper, cardboard and card by adding a microparticle system consisting of a polymer retention agent having a molar mass Mw of at least 2 million and a fine-part inorganic component in order to form a paper material having a material density of a 20 g/l maximum and by dewatering the paper material, wherein the paper material undergoes at least one shearing step prior to or after addition of the retention agent and wherein the retention agent is introduced in a dosed manner into the paper material in at least two places and the fine inorganic component is dosed prior to or after addition of the retention agent or between two dosing points for the retention agent.

L'invention concerne un procédé de fabrication de papier, de carton-pâte et de carton par addition d'un système microparticulaire composé d'un agent de rétention polymère présentant un poids molaire Mw d'au moins deux millions, et d'un composant organique à particules fines, à une pâte à papier présentant une densité maximale de 20 g/l, et déshydratation de la pâte à papier. La pâte à papier est soumise à une étape de cisaillement avant ou après addition de l'agent de rétention, l'agent de rétention est dosé dans au moins deux zones dans la pâte à papier et le composant organique à particules fines est dosé avant ou après addition de l'agent de rétention ou entre deux zones de dosage d'agent de rétention.

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