Apparatus and method for drying a wet web and modifying the...

D - Textiles – Paper – 21 – F

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D21F 5/16 (2006.01) D21F 5/04 (2006.01) D21F 5/18 (2006.01) F26B 13/00 (2006.01) F26B 13/22 (2006.01) F26B 25/22 (2006.01)

Patent

CA 2205698

Apparatus and method for drying a wet web and modifying the moisture profile of the web. A plurality of gas burners are located within the interior of a through air dryer hood to variably heat air passing through the hood interior before it contacts a wet web on a through air dryer web support. The flowing air within the hood interior is divided into air flow portions directed toward different incremental width portions of the wet web. The burners are separately controlled to vary the heat of the individual flowing air portions to provide a uniform web moisture profile.

Appareil et méthode de séchage d'une bande humide, ainsi que de modification de son profil d'humidité. De nombreux brûleurs à gaz sont disposés à l'intérieur d'une hotte de séchage de part en part pour chauffer, de façon variable, l'air traversant la hotte avant qu'il n'entre en contact avec une bande humide sur support. L'air circulant à l'intérieur de la hotte est réparti en veines d'air dirigées vers différentes parties de largeur croissante de la bande humide. Les brûleurs sont réglés séparément pour modifier la chaleur des différentes veines d'air en vue d'obtenir un profil uniforme d'humidité de la bande.

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