D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 11/20 (2006.01) D21H 17/26 (2006.01) D21H 17/29 (2006.01) D21H 23/06 (2006.01)
Patent
CA 2581361
The present invention concerns a process for producing a paper or board product, which process comprises providing a furnish comprising fibers; subjecting a first portion (1) of the furnish to polymer treatment, in which polymers are added to the furnish in at least two steps; blending said polymer treated first portion with an untreated second portion (2) of the furnish; and dewatering the furnish on a wire to form a fiber web. By treating only a portion of the furnish, the strength of the resulting paper or board product is significantly improved whereas the bulk remains substantially unaffected. The invention also concerns a paper or board product produced according to the process.
L'invention concerne un procédé de production de papier ou de carton, selon les étapes suivantes : fourniture de charge comprenant des fibres; traitement polymère d'une première partie (1), pour ajouter des polymères au moins en deux phases; mélange de la partie ainsi traitée avec une seconde partie non traitée (2); et déshydratation de la charge sur une toile pour former une bande fibreuse. En traitant seulement une partie de la charge, on améliore largement la résistance du papier ou du carton résultant, tandis que la densité de volume reste sensiblement non affectée. L'invention concerne aussi un produit (papier ou carton) résultant.
Fredlund Mats
Hallgren Hans
Hoeglund Hans
Pettersson Gunilla
Wagberg Lars
Fetherstonhaugh & Co.
Stora Enso Ab
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