Paper products and methods and systems for manufacturing...

D - Textiles – Paper – 21 – B

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D21B 1/06 (2006.01) D21C 1/00 (2006.01) D21F 5/00 (2006.01)

Patent

CA 2723175

Methods of producing cellulosic or lignocellulosic materials for use in papermaking include treating a cellulosic or lignocellulosic dry feedstock having a first average molecular weight with ionizing radiation, and controlling the dose of ionizing radiation such that the average molecular weight of the feedstock is reduced to a predetermined level. A method of producing an irradiated paper product includes treating a paper product including a first carbohydrate-containing material having a first molecu-lar weight with ionizing radiation, and controlling the dose of ionizing radiation so as to provide an irradiated paper product with a second carbohydrate-containing material having a second molecular weight higher than the first molecular weight. Pulp and pa-per products are produced.

L'invention concerne des procédés de production de matériaux cellulosiques ou lignocellulosiques à usage de la fabrication du papier, qui consistent notamment à traiter une charge sèche cellulosique ou lignocellulosique ayant un premier poids moléculaire moyen par un rayonnement ionisant, et à réguler la dose de rayonnement ionisant de manière que le poids moléculaire moyen de la charge soit réduit à un niveau prédéterminé. Un procédé permettant de produire un produit de papier irradié consiste notamment à traiter un produit de papier comportant un premier matériau contenant des hydrates de carbone ayant un premier poids moléculaire avec un rayonnement ionisant, et à réguler le dose du rayonnement ionisant de façon à produire un produit de papier irradié avec un second matériau contenant des hydrates de carbone ayant un second poids moléculaire supérieur au premier poids moléculaire. L'invention concerne enfin la production de produits de pâtes et papiers.

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