Method for manufacturing papermaking pulp

D - Textiles – Paper – 21 – B

Patent

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Details

D21B 1/16 (2006.01) D21C 9/10 (2006.01) D21C 9/153 (2006.01)

Patent

CA 2739694

The invention relates to a method for manufacturing papermaking pulp, including: a step of refining wood, including an ozone treatment, so as to obtain a mechanical pulp; a deacidification step including placing the mechanical pulp in contact with a deacidification composition including at least one alkaline agent for more than an hour; and a bleaching step including placing the deacidified pulp in contact with a bleaching composition; wherein the pH varies by less than 0.2 points during the last 30 minutes of the deacidification step, and the pH is 6 to 10 at the end of the deacidification step.

L'invention concerne un procédé de fabrication d'une pâte à papier comprenant: une étape de raffinage de bois, comprenant un traitement à l'ozone, de sorte à obtenir une pâte mécanique; une étape de désacidification comprenant la mise en contact de la pâte mécanique avec une composition de désacidification comprenant au moins un agent alcalin pendant une durée supérieure à une heure; et une étape de blanchiment comprenant la mise en contact de la pâte désacidifiée avec une composition de blanchiment; dans lequel le pH varie de moins de 0,2 unité au cours pendant les 30 dernières minutes de l'étape de désacidification, et le pH est compris entre 6 et 10 à l'issue de l'étape de désacidification.

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