Traction-free web transport in a compression section

Details Traction-free web transport in a compression section Traction-free web transport in a compression section

D - Textiles, Paper

21

F

D21F 3/04 (2006.01) D21F 3/02 (2006.01)

Patent

CA 2158728

A compression section of a machine to produce webs of fibrous materials, preferably paper webs, has the following characteristics: (a) a smooth cylinder (4.1) in contact with the web forms a first nip (I) together with a first counter-cylinder (5.1) or with a compression band that runs on a shoe, and forms a second nip (II) with a second counter-cylinder (6.1); (b) an endless, water-absorbing felt (F1) runs together with the web through both consecutive nips; (c) the second counter-cylinder (6.1) is designed as a suction cylinder with an internal stationary seal support that forms a suction zone (7, 8) that lies at least for the most part downstream of the second nip. The compression section is characterized in that a second endless felt (F2) takes over the web from the first felt (F1) in a manner known per se and conveys it through a third nip (III).

La section de compression d'une machine de production de bandes en matières fibreuses, de préférence des bandes en papier, a les caractéristiques suivantes: (a) un cylindre lisse (4.1) en contact avec la bande forme un premier intervalle (I) avec un premier cylindre complémentaire (5.1) ou avec une bande de compression qui roule sur un patin, et un deuxième intervalle (II) avec un deuxième cylindre complémentaire (6.1); (b) un feutre hydrophile sans fin (F1) passe avec la bande à travers les deux intervalles successifs; (c) le deuxième cylindre complémentaire (6.1) est un cylindre aspirant avec un support fixe interne de la garniture d'étanchéité, qui forme une zone d'aspiration (7, 8) située surtout en aval du deuxième intervalle. La section de compression se caractérise en ce que la bande passe de manière connue en soi du premier feutre (F1) à un deuxième feutre sans fin (F2) qui la transporte à travers un troisième intervalle (III).

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