Process for increasing the softness of base webs and...

Details Process for increasing the softness of base webs and... Process for increasing the softness of base webs and...

D - Textiles, Paper

21

F

D21F 11/00 (2006.01) D21F 11/14 (2006.01) D21H 27/02 (2006.01) D21H 25/00 (2006.01)

Patent

CA 2468560

A process for increasing the tactile properties of a base web (38) without adversely effecting the strength of the web is disclosed. In one embodiment, the process includes the steps of placing a creped base web between a first moving conveyor (60) and a second moving conveyor. The conveyors (62) are then wrapped around a shear-inducing roll (64) which creates shear forces and compressive forces that act upon the base web. The shear forces disrupt the web, increasing the softness and decreasing the stiffness of the web. The compressive forces are localized at the areas where the fabric knuckles contact the base web, imparting a unique fabric-imprinted pattern to the web with limited caliper reduction. The shear-inducing roll typically has a relatively small diameter. In some applications, more than one shear-inducing roll may be incorporated into the system.

L'invention concerne un procédé permettant d'augmenter les propriétés tactiles d'une bande de base sans modifier la résistance de cette dernière. Dans un mode de réalisation, le procédé consiste à placer une bande de base en reliefs entre un premier tapis transporteur mobile et un second tapis transporteur mobile. Les tapis transporteurs sont alors enveloppés autour d'un rouleau à cisaillement qui crée des forces de cisaillement et des forces de compression agissant sur la bande de base. Les forces de cisaillement disloquent la bande, ce qui augmente la souplesse et diminue la rigidité de la bande. Les forces de compression se situent au niveau des zones où les charnières de tissu sont en contact avec la bande de base, ce qui permet de fournir à la bande un motif unique imprimé en tissu à réduction d'épaisseur limitée. Le rouleau à cisaillement présente généralement un petit diamètre. Dans certains modes de réalisation, plusieurs rouleaux à cisaillement peuvent être intégrés au système.

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