D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 23/04 (2006.01) D21H 21/20 (2006.01) D21H 17/55 (2006.01)
Patent
CA 2266491
The invention is a method of enhancing the strength of paper products, particularly the dry strength, without adversely affecting repulpability. It is also directed to the resulting products. It is particularly applicable but not limited to products with significant amounts of secondary fiber in the furnish. Preferably, about 10-30 % of the fiber is separated from the furnish at some point prior to sheeting. This is treated with a cationic wet strength resin which is allowed to bond to the fiber. Cationic polyamide-epichlorohydrin resins are particularly useful. The treated fiber is then mixed with the untreated balance of the fiber at some point before the paper machine. Screening fines on repulping do not normally exceed 2-3 %.
L'invention concerne un procédé d'augmentation de la résistance de produits de papier, notamment la résistance à sec, sans que cela nuise à leur aptitude à la retrituration. Elle porte aussi sur les produits résultants. Ledit procédé s'applique, entre autres, à des produits présentant des quantités relativement importantes de fibres secondaires dans la composition de fabrication. De préférence, environ 10 à 30 % des fibres sont séparés de la composition de fabrication, à un certain stade avant la mise en feuilles. Pour ce faire, on utilise de la résine cationique conférant la résistance à l'état humide, que l'on laisse se lier aux fibres. On mélange ensuite les fibres traitées avec le solde non traité de fibres, à un certain stade en amont de la machine à papier. Normalement, les fines de classage lors de la retrituration ne dépassent pas 2 à 3 %.
Hunter Frank R.
Park David W.
Gowling Lafleur Henderson Llp
International Paper Company
Weyerhaeuser Company
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