D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 5/18 (2006.01) D21H 25/06 (2006.01) F26B 13/20 (2006.01)
Patent
CA 2294862
Method and apparatus for drying a coated paper web or the like web. The apparatus comprises sequentially in the running direction of the web - a turning device arranged on the first side of the web and provided with direct blow nozzles, with which the running direction of the web to be dried is turned in a non-contacting way, and web drying devices arranged on the first and the second sides of the web, in which the web is dried in a non-contacting manner. The apparatus further comprises a counterpart provided with inverse overpressure nozzles, arranged on the second side of the web for stabilizing the web run by means of blows generating a local overpressure between the web and radically aligned with the direct blow nozzles and the carrier surfaces of the overpressure nozzles which is uniformly applied along a transverse direction of the web. A common housing structure allows blowing air from the overpressure nozzles is absorbed into a drying section and discharged for minimizing the moisture content and the thermal load in the machine room. A control device is also provided for accurately positioning the web between the running device and the counterpart based on continuous pressure sensor readings.
L'invention concerne un procédé et un appareil permettant de sécher une bande de papier couché (W) ou bande analogue. L'appareil (10) comprend successivement dans le sens d'avance de la bande un dispositif courbe (16) disposé sur le premier côté de la bande et équipé de buses de soufflage (20) à l'aide desquelles le sens d'avance de la bande à sécher suit une trajectoire courbe sans qu'il y ait de contact physique, et des dispositifs de séchage (30, 30') de la bande disposés sur le premier et le second côtés de la bande. La bande est séchée sans qu'il y ait de contact physique. L'appareil comprend en outre un dispositif opposé (18) doté de buses à surpression (24), se trouvant sur le second côté de la bande à la hauteur du dispositif courbe (16) de façon à stabiliser l'avance de la bande grâce à des jets d'air entraînant une surpression locale entre la bande (W) et les surfaces de support des buses à surpression (24).
Ringbom Knut
Solin Richard
Gowling Lafleur Henderson Llp
Metso Paper Inc.
Valmet Corporation
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