Press section and process for draining a watery fibrous pulp...

D - Textiles – Paper – 21 – F

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

Patent

CA 2213352

The press section of a paper machine dewaters a watery fibrous pulp sheet which is guided along with a continuous circulating felt belt through two sequentially-arranged press openings. The felt belt is dried by a conditioning device positioned between the two press openings, and the felt belt is again dried with the aid of another conditioning device after it exits the second press opening but before it returns to the first press opening. By quickly separating the felt belt from the watery fibrous pulp sheet after they pass through the press openings, reverse moistening of the felt belt is effectively prevented. A smooth, soft press belt preferably guides the fibrous pulp sheet between the two press openings.

La section des presses d'une machine à papier exprime l'eau d'une feuille de pâte humide guidée sur un rouleau de feutre à mouvement continu entre deux entrées de presse disposées en séquence. Le rouleau de feutre est asséché au moyen d'un appareil de conditionnement placé entre les deux entrées de presse, et est asséché de nouveau au moyen d'un autre appareil de conditionnement après être sorti de la deuxième entrée, mais avant de passer par la première entrée de presse. En séparant rapidement la feuille de pâte humide du rouleau de feutre après leur passage dans les entrées, on évite donc de mouiller le rouleau de feutre qui revient en sens inverse. De préférence, un rouleau de feutre lisse et doux guide la feuille de pâte entre les deux entrées de presse.

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