Infrared dryer with air purge shutter

F - Mech Eng,Light,Heat,Weapons – 26 – B

Patent

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Details

F26B 21/06 (2006.01) D21F 5/00 (2006.01) D21F 5/18 (2006.01) F26B 3/04 (2006.01) F26B 3/30 (2006.01) F26B 13/10 (2006.01) F26B 13/20 (2006.01)

Patent

CA 2370625

A combination infrared/air convection dryer or oven for travelling webs. A shutter assembly (40) is provided between the infrared radiation source (17) and the moving web in order to selectively expose the web to infrared radiation, and to create a sealed air chamber (19) when in the closed position. Enhanced drying of the web and/or a coating on the web at high speed is achieved without a concomitant increase in dryer length. When the drying atmosphere has a high concentration of solvent, exposure of that atmosphere to the heating elements, which can cause explosions, is eliminated by actuation of the shutters. In a preferred embodiment of the invention, air bars are used to floatingly support the moving web to avoid contact of the web with dryer elements.

L'invention concerne un sécheur ou un four à convection combinant infrarouge et air pour bandes continues en mouvement. Un ensemble volets (40) est prévu entre la source de rayonnement infrarouge (17) et la bande continue en mouvement pour exposer celle-ci de manière sélective au rayonnement infrarouge, et pour former une chambre (19) d'air hermétique en position fermée. Ce système permet d'obtenir un séchage amélioré de la bande continue et/ou de former un revêtement amélioré sur celle-ci à grande vitesse sans allongement concomitant de la longueur du sécheur. Lorsque l'atmosphère de séchage présente une concentration élevée de solvant, on évite d'exposer les éléments chauffants à cette atmosphère, ce qui pourrait provoquer des explosions, en actionnant les volets. Dans une forme de réalisation préférée de l'invention, des barres d'air sont utilisées pour soutenir de manière flottante la bande continue en mouvement de façon à éviter un contact entre celle-ci et des éléments du sécheur.

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