System and process for reducing the caliper of paper webs

Details System and process for reducing the caliper of paper webs System and process for reducing the caliper of paper webs

D - Textiles, Paper

21

F

D21F 11/14 (2006.01) D21G 1/00 (2006.01) D21H 25/00 (2006.01)

Patent

CA 2464658

A process for increasing the tactile properties of a base web without adversely affecting the strength of the web is disclosed. In general, the process includes the steps of placing a base web in between a first moving conveyor (60) and a second moving conveyor (62). The conveyors are then wrapped around a shear inducing roll (64) which creates shear forces that act upon the base web. 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. In other applications, the shear inducing roll can also be a nip roll for decreasing the caliper of the base web. The shear inducing roll may be stationary, as in the form of a stationary shoe with a convex edge, or may rotate. In one embodiment, the shear inducing roll can rotate on an air bearing.

L'invention concerne un procédé permettant d'augmenter les propriétés tactiles d'une bande principale sans affecter sa résistance. Le procédé consiste, en général, à placer une bande principale entre un premier transporteur mobile (60) et un second transporteur mobile (62). Les transporteurs s'enroulent alors autour d'un cylindre induisant un cisaillement (64) créant des forces de cisaillement qui agissent sur la bande principale. Le cylindre inducteur de cisaillement est, typiquement, de diamètre relativement petit. Dans certains applications, il est possible de disposer dans le système plusieurs cylindres induisant un cisaillement. Dans d'autres applications, le cylindre inducteur de cisaillement peut aussi se trouver sous la forme d'un cylindre pinceur permettant de diminuer l'épaisseur de la bande principale. Le cylindre inducteur de cisaillement peut être stationnaire, sous la forme d'un sabot stationnaire à bord convexe, ou peut tourner. Dans un mode de réalisation, le cylindre inducteur de cisaillement peut tourner sur des paliers à air.

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