Method in contact-free air-drying of a material web as well...

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 5/18 (2006.01) F26B 13/20 (2006.01)

Patent

CA 2092004

The invention relates to a method for air-drying material webs, in particular material webs of relatively high grammage such as pulp webs. The invention also relates to a nozzle-blow-box and a pulp dryer that make use of the method. Air blowings in a direction substantially perpendicular to the web and air blowings in a direction substantially parallel to the plane of the web are applied to the web to be dried from underneath the web. By means of these blowings, both heat is transferred to the web and the web is supported by the air free of contact, and the run of the web through the dryer is stabilized. In order to improve the transfer of heat in comparison with a planar carrier face, the air flow velocity parallel to the plane of the web is initially kept substantially invariable. The air flow velocity is lowered in the lateral areas of the carrier face by employing lateral areas of the nozzle-carrier face that become rampwise and/or stepwise lower in the air-flow direction.

Méthode pour le séchage à l'air de bandes continues de matière, particulièrement de bandes de grammage relativement élevé comme les matelas de pâte. L'invention porte aussi sur un caisson de soufflage à buses et un séchoir de pâte utilisant cette méthode. De l'air soufflé en direction essentiellement perpendiculaire à la bande continue et de l'air soufflé en direction essentiellement parallèle au plan de la bande continue est projeté sur la bande à sécher à partir du dessous de la bande. Grâce à ce soufflage, la chaleur est transférée vers la bande, celle-ci est supportée par l'air sans contact, et la course de la bande dans le séchoir est stabilisée. Afin d'améliorer l'échange thermique par rapport à une face portante plane, la vitesse du passage d'air parallèle au plan de la bande est maintenue essentiellement constante initialement. La vitesse du passage d'air est diminuée dans les zones latérales de la face portante en utilisant les zones latérales de la face portante à buses devenant à variation constante et/ou à échelons plus bas dans le sens du passage d'air.

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