Methods for producing coating base papers and coated papers

Details Methods for producing coating base papers and coated papers Methods for producing coating base papers and coated papers

D - Textiles, Paper

21

H

D21H 17/37 (2006.01) D21F 3/02 (2006.01) D21F 9/02 (2006.01) D21H 17/44 (2006.01) D21H 21/10 (2006.01)

Patent

CA 2684593

A process for producing a coated-paper base and a coated paper in which the coated-paper base is produced by a neutral papermaking method with a gap former papermaking machine of the roll-and-blade former type which has a dehydration mechanism based on a dehydrating blade immediately after initial dehydration with forming rolls. The process includes adding to a stock a cationic polyacrylamide substance having a weight-average molecular weight as measured by the intrinsic-viscosity method of 10,000,000 or higher as a yield improver before the stock is formed. The process can attain improvements in yield based on the stock and in texture and interlaminar strength. Fine anionic particles and/or a coagulant can also be used.

L'invention concerne un procédé pour la fabrication d'une base de papier couché et d'un papier couché dans lequel la base de papier couché est produite selon un procédé de fabrication de papier neutre avec une machine de fabrication de papier à formeur d'espace du type formeur d'espace à rouleau et lame qui comprend un mécanisme de déshydratation basé sur une lame de déshydratation suivant immédiatement la déshydratation initiale avec des rouleaux de formage. Le procédé inclut l'ajout à une solution de réserve d'une substance polyacrylamide cationique dont le poids moléculaire moyen en poids tel que mesuré selon le procédé de viscosité intrinsèque est supérieur ou égal à 10 000 000 en tant qu'agent améliorant le rendement avant la formation de la solution de réserve. Le procédé peut permettre d'atteindre des améliorations de rendement sur la base de la solution de réserve et en termes de texture et résistance interlaminaire. Il est également possible d'utiliser des particules fines anioniques et/ou un coagulant.

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