Nozzle arrangement in airborne web-drying and method for...

Details Nozzle arrangement in airborne web-drying and method for... Nozzle arrangement in airborne web-drying and method for...

D - Textiles, Paper

21

F

D21F 5/18 (2006.01) F26B 13/10 (2006.01)

Patent

CA 2377523

A nozzle arrangement in an airborne web-drying apparatus for drying a coated paper web (10) or the like. The nozzle arrangement comprises at least one overpressure nozzle (14), which is arranged to blow drying air both in the web's travel direction and against the web's travel direction. The nozzle arrangement comprises further a direct impingement nozzle (16) combined with the exit side and/or the entrance side (26) of the overpressure nozzle, in which direct impingement nozzle a plurality of nozzle slots or nozzle orifices (17) are formed in order to blow drying air mainly perpendicularly toward the web. The perpendicular distance (a1) from the nozzle surface (30) of the direct impingement nozzle (16) to the web is larger than the perpendicular distance (a2) from the supporting surface (32) of the overpressure nozzle (14) to the web.

L'invention concerne un système de buse dans un appareil de séchage de bande aéroportée servant à sécher une bande de papier couché (10) ou une bande analogue. Le système de buse comprend au moins une buse à surpression (14), disposée de manière à souffler de l'air séchant à la fois dans le sens de déplacement de la bande et dans le sens opposé. Le système de buse comprend, en outre, une buse à action percutante directe (16) combinée au côté sortie et/ou entrée (26) de la buse à surpression (14). La buse à action percutante directe comporte une pluralité de fentes ou d'orifices à fonction de buse (17) servant à souffler de l'air séchant surtout perpendiculairement à la bande. La distance perpendiculaire (a1) entre la surface de buse (30) de la buse à action percutante directe (16) et la bande est plus grande que la distance perpendiculaire (a2) entre la surface de support (32) de la buse à surpression (14) et la bande.

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