A multi-ply web forming method and apparatus and a multi-ply...

D - Textiles – Paper – 21 – F

Patent

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D21F 11/04 (2006.01) D21F 9/00 (2006.01) D21H 27/30 (2006.01)

Patent

CA 2300927

A multi-ply web forming method and apparatus are disclosed for forming a top ply onto a base ply. A fibre suspension jet is delivered into a twin-wire roll nip created by two tensioned wires (16,22;16',22';22,27) one of which (16;16',22) carries the moist base ply. The web forming of the top ply is performed by means of roll forming (23,23',28) wherein the fibre suspension jet is delivered to said twin-wire nip at a high speed to cause a yielding deflection of the outer tensioned wire, while maintaining constant tension during said deflection of the outer wire by guiding said wire on rotating supports (31a'--c';32a-c) at least one of which is resiliently or displaceably mounted to compensate for said deflection, wherein the speed of said fibre suspension is at least 300 m/min and the wire tension of the outer as well as the inner wire is at least 4 kN/m.

La présente invention concerne un procédé et un dispositif de réalisation de nappe en plusieurs épaisseurs permettant de réaliser une épaisseur supérieure au-dessus d'une épaisseur de base. Ce procédé consiste à prendre un jet de fibres en suspension et de le déposer au moyen d'un caisson secondaire (21; 21', 26) dans des cylindres de calandrage réalisés avec deux toiles tendues (16, 22; 16', 22'; 22, 27) dont l'une (16; 16', 22) porte la couche de base humide. La formation en nappe de l'épaisseur supérieure s'effectue uniquement par un profilage (23, 23', 28) consistant à apporter le jet de fibres en suspension dans les cylindres de calandrage à deux toiles à une vitesse assez élevée pour provoquer une inflexion de la toile extérieure tendue. A cet effet, on conserve sensiblement constante la tension pendant l'inflexion de la toile extérieure en guidant celle-ci sur des supports en rotation (31a-c; 31a'-c'; 32a-c) dont l'un est monté en élasticité ou en mobilité de façon à corriger l'inflexion considérée. En l'occurrence, la vitesse de la suspension de fibres apportées dans la calandre à deux toiles est d'au moins de 300 m/mn, la tension de la toile extérieure ou intérieure étant d'au moins kN/m.

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