Method and device for drying paper

Details Method and device for drying paper Method and device for drying paper

D - Textiles, Paper

21

F

D21F 5/00 (2006.01) D21F 5/14 (2006.01) D21F 5/18 (2006.01) F26B 13/08 (2006.01)

Patent

CA 2090783

A method and device in the drying of paper, especially of fine paper or newsprint is disclosed. A paper web to be dried is passed over a mantle face of a large-diameter flow-through cylinder. On the flow-through cylinder, a set of drying-gas jets is applied to the free outer face of the web through a nozzle arrangement. Water is evaporated outward from the outer part of the web by means of the set of drying-gas jets. The water vapor thus evaporated is removed through spaces in the blowing-on hood. By means of the set of drying-gas jets, the interior of the web to be dried is also heated. The mantle face of the flow-through cylinder is cooled by means of a medium flow. Water that has been vaporized out of the web and that has been condensed onto the cooled faces is sucked by means of negative pressure present in the interior of the flow-through cylinder.

Méthode et dispositif pour le séchage du papier, particulièrement le papier fin ou le papier journal. Une bande continue de papier à sécher est acheminée sur la face de parement d'un cylindre de passage de grand diamètre. Sur ce cylindre, des jets de gaz de séchage sont répandus sur la face extérieure libre de la bande par des buses. L'eau s'évapore vers l'extérieur, depuis la partie extérieure de la bande grâce aux jets de gaz de séchage. Les vapeurs d'eau s'échappent par des espaces dans la chappe de soufflage. L'intérieur de la bande devant être séchée est aussi chauffé au moyen des jets de gaz de séchage. La face de parement du cylindre est refroidie par une circulation moyenne. L'eau s'évaporant de la bande continue et se condensant sur les faces refroidies est aspirée grâce à la pression négative à l'intérieur du cylindre de passage.

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