Dry end of a machine for the production of a fiber web

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 5/04 (2006.01) D21F 7/02 (2006.01)

Patent

CA 2097736

A paper making machine comprises a press followed by an adjoining dry end having a plurality of dryer groups I to VI. Each dryer group comprises only one row of dryer cylinders and one row of reversal suction rolls which alternate with the dryer cylinders, and a respective endless support belt passing around the cylinders and rolls of each group along a guided meander path. The press and each of the dryer groups has a respective variable web speed drive. A speed control device controls the drives such that a positive difference in speed is present between the first dryer group and the press and a negative difference in speed is present between the last two dryer groups. Separation places may be defined between at least some of the dryer groups. Some of the separation places are closed providing support for the web passing between groups, and others are open providing an unsupported open draw for the web.

La présente invention vise une machine à papier comprenant une presse suivie d'une section de séchage contiguë constituée de six (I à VI) groupes de séchoirs. Chaque groupe de séchoirs comprend une seule rangée de cylindres sécheurs et une seule rangée de rouleaux aspirants fonctionnant en alternance, ainsi qu'une bande support passant autour des cylindres et des rouleaux, selon une configuration sinueuse. Dans la section de presse et dans la section de séchage, la bande se déplace à vitesse variable. Un régulateur de vitesse commande les dispositifs d'entraînement de manière à assurer une différence de vitesse positive entre les deux premiers groupes de séchoirs et la presse, et une différence de vitesse négative entre les deux derniers groupes de séchoirs. Des espaces de séparation peuvent être prévus au moins entre certains des groupes. Certains espaces sont fermés pour assurer un support à la bande qui se déplace entre les groupes, d'autres ne le sont pas (tirage ouvert).

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