Process for applying a thin film containing low levels of a...

D - Textiles – Paper – 21 – H

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D21H 23/24 (2006.01) D21H 17/00 (2006.01) D21H 17/59 (2006.01) D21H 19/32 (2006.01) D21H 21/20 (2006.01) D21H 21/24 (2006.01) D21H 23/56 (2006.01)

Patent

CA 2185108

Disclosed is a process for making soft tissue paper which includes providing a dry tissue web and then applying a sufficient amount of a functional-polysiloxane softener compound to the dry web. The softener application process includes the steps of mixing a functional- polysiloxane compound with a suitable nonvolatile diluent, such as a nonfunctional-polysiloxane, forming an emulsion containing the functional-polysiloxane compound and nonvolatile diluent using a volatile solvent, such as water, and surfactant emulsifier, applying the emulsion to a heated transfer surface, evaporating the volatile solvent from the emulsion to form a film, and then 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 functional-polysiloxane material. The process may further include the steps of applying an effective amount of a surfactant material to enhance softness and or wettability control; and or an effective amount of a binder material such as starch, for linting control. and/or to contribute tensile strength to the tissue paper.

L'invention concerne un procédé de fabrication de papier ouaté qui consiste à produire une bande de papier de soie sèche, et à appliquer sur cette dernière une dose suffisante de composé adoucissant polysiloxane fonctionnel. Le procédé d'application de l'adoucissant consiste à mélanger un composé polysiloxane fonctionnel avec un diluant non volatil approprié tel que du polysiloxane non fonctionnel, à former une émulsion contenant ledit composé polysiloxane fonctionnel et un diluant non volatil au moyen d'un solvant volatil tel que de l'eau, et un émulsifiant tensioactif, à appliquer l'émulsion sur une surface de transfert chauffée, à laisser le solvant volatil s'évaporer de l'émulsion pour former un film, et à mettre la bande de papier de soie sèche en contact avec la surface de transfert chauffée. La bande de papier est, de préférence, séchée jusqu'à un niveau d'humidité situé au-dessous de sa teneur en eau d'équilibre, avant l'application du polysiloxane fonctionnel. Ce procédé peut également comprendre les étapes consistant à appliquer une dose efficace de substance tensioactive de manière à augmenter la douceur du papier et/ou faire en sorte qu'il conserve sa mouillabilité; et/ou une dose efficace de substance de liaison telle que de l'amidon pour empêcher le peluchage, et/ou conférér une résistance à la rupture dudit papier.

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