Arrangement and method for treatment of webs using nozzles...

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 5/14 (2006.01) B65H 23/24 (2006.01) D21F 5/18 (2006.01) F26B 13/20 (2006.01)

Patent

CA 2077514

The invention relates to an arrangement of nozzles with negative pressure intended for the treatment of webs. A nozzle directs a drying and supporting gas flow at the web and which has a box construction, and a nozzle space formed at one side of the nozzle. The nozzle space is provided with a nozzle slot defined by nozzle walls. One of the walls operates as a curved guide face which is fitted to turn the gas flow passed out of the nozzle slot, based on the Coanda effect, so as to make it parallel to the carrier face formed on the top face of the nozzle. At least one second nozzle slot is provided at a distance before said first nozzle slot, in the running direction of the web. A flow guiding fitted in connection with the second nozzle slot is arranged so that the flow has a substantially large velocity component perpendicular to the direction of running of the web. The velocity component parallel to the plane of running of the web of the flow passed out of the second nozzle slot is larger than zero.

Cette invention concerne une configuration de caisses de séchage et supportage en cours de traitement d'une bande de papier en mouvement, caisses réalisant une pression négative. Une caisse dirige un flux d'air de séchage et de supportage vers la bande défilante, caisse dont un côté est en retrait par rapport à la bande de papier. Cette partie de la caisse comporte une fente délimitée par des parois dont une est courbe pour dévier le flux d'air, en vertu du principe de l'effet Coanda, et le rendre parallèle à la face supérieure de la caisse. Au moins une seconde fente est prévue à une distance donnée en aval de la première, c'est-à-dire dans le sens de défilement de la bande. Un déflecteur de flux équipant la seconde fente est disposé de manière à donner au flux une composante de vitesse orthogonale à la bande de papier d'un ordre de grandeur sensiblement élevé. Le flux d'air sortant de la seconde fente a une composante de vitesse parallèle au plan de défilement de la bande de papier non nulle.

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