Improving lay flat properties of printing paper

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 19/12 (2006.01) B41M 5/00 (2006.01) B41M 5/52 (2006.01)

Patent

CA 2287421

The specification discloses a method for improving the lay flat properties of paper which comprises applying to a cellulosic fibrous web an aqueous solution consisting essentially of a dialdehyde, preferably glyoxal, and from about 50 to about 150 parts by weight of a polyol, preferably glycerol, per 100 parts of the dialdehyde and then drying the web at a temperature sufficient to cure the glyoxal and polyol. The concentration of dialdehyde and polyol in the solution is sufficient to provide a combined total of from about 0.1 to about weight percent dialdehyde and polyol in the web based on the oven-dry weight of the paper. The solution is preferably applied in a papermaking process at or after the wet press and prior to treating the web with chemicals having free hydroxyl groups which may react with the dialdehyde.

L'invention concerne un procédé permettant d'améliorer la capacité du papier à rester à plat, selon lequel une solution aqueuse comprenant essentiellement un dialdéhyde, de préférence du glyoxal, et entre environ 50 et 150 parties en poids d'un polyol, de préférence du glycérol, pour 100 parties de dialdéhyde est appliquée sur une bande fibreuse cellulosique. La bande est ensuite séchée à une température permettant de durcir le glyoxal et le polyol. La concentration en dialdéhde et en polyol dans la solution suffit à fournir un total combiné d'environ 0,1 à 10 % en poids de dialdéhyde et polyol dans la bande sur la base du poids anhydre du papier. La solution est appliquée de préférence dans le cadre d'un processus de fabrication de papier, pendant ou après le pressage humide et avant le traitement de la bande avec des produits chimiques présentant des groupes hydroxyle libres susceptibles de réagir au dialdéhyde.

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