Process for increasing the degree of whiteness of paper...

Details Process for increasing the degree of whiteness of paper... Process for increasing the degree of whiteness of paper...

D - Textiles, Paper

21

C

D21C 5/02 (2006.01) D21B 1/32 (2006.01) D21C 9/10 (2006.01) D21C 9/147 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2202714

A process for increasing a degree of whiteness of paper pulp may include bring paper fiber pulp, which may at least partially include printed waste paper, into a suspension with water. The suspension may be mixed with bleaching aids and bleaching chemicals. The bleaching chemicals may preferably contain molecular oxygen. Intensely mechanically treating the pulp, e.g., at at least 20 kWh/to, prior to bleaching the pulp suspension. The bleaching period may take at least 10 minutes, with a pressure above the atmospheric pressure being exerted during the bleaching. After bleaching, a major portion of remaining color print particles may be removed from the bleached pulp. -24-

Procédé visant à augmenter la blancheur de la pâte à papier pouvant inclure la pâte à papier de production, laquelle peut au moins en partie inclure du papier imprimé, dans une suspension comprenant de l'eau. La suspension peut être mélangée à des adjuvants de blanchiment et à des réactifs de blanchiment. Les réactifs de blanchiment peuvent de préférence contenir des l'oxygène moléculaire. Un traitement mécanique intense de la pâte s'impose, p. ex., à au moins 20 kW/t, avant le blanchiment de la pâte en suspension. Le blanchiment peut prendre au moins 10 minutes, à une pression supérieure à la pression atmosphérique, qui est appliquée pendant l'opération. Après le blanchiment, une partie importante des particules des imprimés en couleur restants peut être enlevée de la pâte blanchie.

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