Process for increasing the basis weight of sheet materials

Details Process for increasing the basis weight of sheet materials Process for increasing the basis weight of sheet materials

B - Operations, Transporting

31

F

B31F 1/12 (2006.01) C09J 123/08 (2006.01) C09J 133/02 (2006.01) D21H 21/18 (2006.01) D21H 27/30 (2006.01)

Patent

CA 2670494

Sheet-like products are disclosed containing an additive composition. In accordance with the present disclosure, the additive composition is applied to a creping surface. A base sheet is then pressed against the creping surface for contact with the additive composition. The base sheet is then creped from the creping surface causing the additive composition to transfer to the base sheet. In particular, the additive composition is transferred to the base sheet in amounts greater than about 1 % by weight, such as from about 2% to about 50% by weight. The additive composition can comprise, for instance, a thermoplastic polymer resin containing an aqueous dispersion, a lotion, a debonder, a softener, or mixtures thereof.

Matériaux en feuille contenant une composition d'additif. Selon l'invention, cette composition d'additif s'applique sur une surface reliéfée. Une feuille de base est ensuite appliquée à la presse contre la surface reliéfée pour contact avec la composition d'additif. La feuille de base est ensuite reliéfée à partir de la surface de crêpage, ce qui provoque un transfert de la composition d'additif sur la feuille de base: La composition d'additif est en particulier transférée sur la feuille de base en quantité supérieure à environ 1% en poids, par exemple entre 2% et 50% environ en poids. Cette composition peut comprendre, notamment, une résine de polymère thermoplastique contenant une dispersion aqueuse, une lotion, un déliant, un adoucisseur, seuls ou mélangés entre eux.

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