Method and arrangement in a multi-cylinder dryer of a paper...

D - Textiles – Paper – 21 – F

Patent

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D21F 5/04 (2006.01)

Patent

CA 2178380

A method for causing adherence of a web to a drying wire so as to prevent the effects of centrifugal forces and of other air-flow phenomena, which effects attempt to separate the web from the drying wire in dryer groups having a single-wire draw and arranged in a multi-cylinder dryer of a paper machine. The dryer groups include heated drying cylinders, a drying wire for pressing the web against outer cylinder faces of the drying cylinders, and guide cylinders or rolls on which the web runs on the outside face of the drying wire. The guide cylinders have perforations which pass through the cylinder mantle and open into an inside space in the interior of the guide cylinders which is subjected to a vacuum. The vacuum in the guide cylinders is transferred to the outside face through the perforations. The guide cylinders have shafts on which the guide cylinders are mounted revolving. The vacuum level in the guide cylinders is regulated by means of the air quantity in compliance with the threading/running stage and/or running speed and/or with any other process or running parameter of the dryer section of the paper machine so that the effect of the vacuum is sufficient to keep the web in reliable contact with the drying wire.

Méthode pour faire adhérer une bande à une toile de séchage de façon à empêcher les effets des forces centrifuges et d'autres phénomènes de débit d'air qui essaient de séparer la bande de la toile de séchage dans des groupes sécheurs ayant une seule toile et arrangés dans un sécheur multi-cylindres d'une machine à papier. Les groupes sécheurs comprennent des cylindres sécheurs chauffés, une toile de séchage pour comprimer la bande contre les surfaces extérieures des cylindres sécheurs, et des cylindres guides dirigeant la bande sur la surface extérieure de la toile de séchage. Les cylindres guides comprennent des perforations qui traversent le manchon du cylindre et débouchent dans un espace à l'intérieur des cylindres guides soumis à une dépression. La dépression contenue dans les cylindres guides est transférée à la surface extérieure par les perforations. Ces cylindres tournent sur des arbres. Le niveau de dépression des cylindres guides est régulé par la quantité d'air en accord avec l'étape d'engagement/fonctionnement et/ou la vitesse de fonctionnement et/ou tout autre processus ou paramètre de fonctionnement de la section de séchage de la machine à papier de façon que l'effet de dépression est suffisant pour garder la bande en contact sûr avec la toile de séchage.

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