Method and apparatus for drying a paper web

Details Method and apparatus for drying a paper web Method and apparatus for drying a paper web

D - Textiles, Paper

21

F

D21F 5/04 (2006.01) D21F 5/00 (2006.01) D21F 5/18 (2006.01) D21F 7/00 (2006.01)

Patent

CA 2311358

A method and apparatus effect drying of a paper web using a plurality of heated drying cylinders and at least one air impingement module having a hood. The paper web is brought into operative contact with the heated drying cylinders, and at least one of the final moisture content, quality, and cross-direction profile of the paper web is regulated. The regulation is effected.by adjusting the efficiency of air impingement drying of the paper web, by adjusting at least one of the blowing velocity of the medium (typically air) blown against the paper web, the humidity of the blowing medium, and the distance of the hood of the impingement module from the paper web. At least one of the final moisture content of the paper web and its quality may also be regulated by adjusting the steam pressure of one or more drying cylinder groups. Typically the final moisture. content of the web is measured after the last drying cylinder group and the efficiency of air impingement drying is regulated on the basis of that measurement.

L'invention concerne un procédé et un appareil de séchage d'une bande continue de papier. Le procédé consiste à sécher une bande continue de papier (W) contre les surfaces chauffées des cylindres sécheurs (20, 24, 24'; 410) par séchage à jet d'air, à l'aide d'au moins un module à jet d'air (M0, M1, M2, M3; 434, 634, 734). La teneur en humidité finale de la bande continue de papier (W) et/ou sa qualité et/ou son profil sens travers sont régulés par réglage de l'efficacité du séchage à jet d'air. Pour optimiser le séchage et/ou la consommation d'énergie, la bande continue de papier en provenance de la section de presses peut d'abord être séchée à l'aide d'au moins un groupe de cylindres sécheurs, jusqu'à obtention d'une teneur sèche moyenne supérieure à 70 %. La bande continue est ensuite amenée dans un dispositif de régulation du séchage, du profilage et du gondolement, dans lequel dispositif la teneur sèche de la bande continue de papier est amenée au niveau voulu par application d'un souffle d'air chaud ou de jets de vapeur sur la bande continue de papier.

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