D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 5/02 (2006.01) D21F 1/00 (2006.01) D21F 5/04 (2006.01)
Patent
CA 2097436
The invention relates to a method and a wire group in a drying section provided with single-wire draw in a paper machine or paper finishing machine. A paper web to be dried is passed on support of a drying wire alternatingly over heated cylinder faces of drying cylinders and over leading rolls or other equivalent drying cylinders. The paper web is pressed into direct contact against the heated cylinder face of the drying cylinders and, on the leading rolls, the paper web is placed on the outside face of the drying-wire loop at a side of the outside curve. In the invention, the difference in speed of the paper web which the paper web would have during operation of the drying section on the turning sectors of the drying cylinders and the leading rolls is reduced by dimensioning of the structure of the drying wire in the direction of thickness and by selecting appropriate materials for the structure of the drying wire.
Méthode et ensemble de toile d'une unité de séchage dotée d'une tréfileuse simple, dans une machine à papier ou une machine de finissage du papier. Une bande continue de papier devant être séchée passe sur le support d'une toile de séchage, en alternance sur les faces chauffées des cylindres sécheurs et sur les rouleaux de guidage ou d'autres cylindres de séchage similaires. La bande continue de papier est pressée directement contre la face chauffée des cylindres sécheurs et, sur les rouleaux de guidage, la bande de papier continue est placée sur la face extérieure de la boucle de la toile de séchage sur un côté de la courbe extérieure. Selon cette invention, durant le fonctionnement de l'unité de séchage, les variations de vitesses de la bande continue de papier sur les éléments de retournement des cylindres sécheurs et sur les rouleaux de guidage sont réduites en calibrant la structure de la toile de séchage au niveau de l'épaisseur, et en choisissant des matériaux appropriés pour la structure de la toile de séchage.
Sim & Mcburney
Valmet Corporation
LandOfFree
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