Method and device for drying a moving web material

Details Method and device for drying a moving web material Method and device for drying a moving web material

F - Mech Eng,Light,Heat,Weapons

26

B

F26B 3/30 (2006.01) D21F 5/00 (2006.01) D21F 5/16 (2006.01) F26B 13/10 (2006.01)

Patent

CA 2222047

The invention concerns a method and a device for drying a moving web material (P). The device (10) is fitted to direct infrared radiation at the moving web material (P) to be dried. The device (10) comprises at least one first infrared radiator (11) and at least one second infrared radiator (12), which are fitted at the vicinity of one another, and the wavelength ( .lambda. maximum) (T1) of the maximum intensity of the radiation of the first infrared radiator (11) is shorter than the wavelength ( .lambda. maximum) (T2) of the maximum intensity of the radiation of said second radiator (12). The first infrared radiator (11) is placed at one side of the web material (P) and the second infrared radiator (12) at the opposite side. The power density of the first infrared radiator (11) is 450...700 kW per sq m and the emitter temperature 2000...2800 °C, and the surface layer (15) of the second infrared radiator (12) is made of a metal, a metal alloy or a ceramic material whose emissivity is substantially higher than, or equal to, 0.6.

Méthode et dispositif de séchage d'un matériau en bande continue mobile (P). Ce dispositif (10) est réglé pour diriger un rayonnement infrarouge sur le matériau (P) devant être séché. Il (10) comprend au moins un premier radiateur infrarouge (11) et au moins un second radiateur infrarouge (12), qui sont ajustés l'un près de l'autre. La longueur d'onde (.lambda.maximum) (T1) de l'intensité maximale du rayonnement du premier radiateur infrarouge (11) est plus courte que la longueur d'onde (.lambda.maximum) (T2) de l'intensité maximale du rayonnement du second radiateur (12). Le premier radiateur infrarouge (11) est placé sur un côté du matériau en bande continue (P) et le second radiateur infrarouge (12) est placé sur le côté opposé. La densité d'énergie du premier radiateur infrarouge (11) est de 450 à 700 kW par m carré, et la température d'émetteur est de 2000 à 2800 degrés C. La couche de surface (15) du second radiateur infrarouge (12) est de métal, d'un alliage ou d'un matériau céramique dont l'émissivité est égale ou sensiblement supérieure à 0,6.

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