Process for applying chemical papermaking additives from a...

D - Textiles – Paper – 21 – H

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D21H 23/64 (2006.01) D21H 17/00 (2006.01) D21H 19/14 (2006.01) D21H 19/32 (2006.01) D21H 21/18 (2006.01) D21H 21/22 (2006.01) D21H 23/56 (2006.01)

Patent

CA 2143340

Disclosed is a process for making soft tissue paper which includes providing a dry tissue web and then applying a sufficient amount of a chemical papermaking additive from a thin film to the dry web. The chemical papermaking additives are added to the surface of the tissue paper to enhance properties of the paper such as strength, softener, absorbency, and/or aesthetics. The chemical papermaking additive application process includes the steps of diluting the chemical papermaking additive with a suitable solvent, applying the diluted chemical solution to a heated transfer surface, evaporating the solvent from the dilute solution to form a film, and then transferring the film to the tissue by contacting the dry tissue web with the heated transfer surface. Preferably, the tissue web is dried to a moisture level below its equilibrium moisture content before application of the papermaking additive.

Procédé de fabrication d'articles souples et doux en ouate de cellulose selon lequel on utilise une bande d'ouate de cellulose sèche sur laquelle on applique une quantité suffisante d'un additif chimique utilisé dans l'industrie du papier à partir d'un film mince. On ajoute les additifs chimiques sur la surface des articles en ouate de cellulose pour renforcer des propriétés telles que la résistance, la douceur, le pouvoir d'absorption et/ou l'esthétique. Le procédé d'application d'additifs chimiques comporte les étapes suivantes: on dilue tout d'abord l'additif chimique avec un solvant approprié, on applique la solution d'additif chimique dilué sur une surface de transfert chauffée, on laisse le solvant s'évaporer de la solution diluée pour obtenir un film puis on transfère le film sur l'article en ouate de cellulose en mettant en contact la bande d'ouate de cellulose sèche avec la surface de transfert chauffée. De préférence, on déshydrate la bande d'ouate de cellulose jusqu'à un niveau d'humidité inférieur à son niveau d'équilibre d'humidité avant d'appliquer l'additif pour papier.

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