Press section in a paper machine in which an extended-nip...

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 3/00 (2006.01) D21F 3/02 (2006.01) D21F 3/04 (2006.01) D21G 1/02 (2006.01)

Patent

CA 2235329

The invention concerns a press section in a paper machine, which press section comprises a compact combination of rolls, which rolls form a number of press nips with one another, which nips remove water out of the paper web (W). Between said nips, the paper web (W) has a closed draw supported by a press fabric or by a roll face. The press section includes a centre roll (20; 20A), in connection with which there are at least two press nips (N2, NP1; N2, NP11). The last nip placed in connection with the centre roll (20; 20A) is an extended nip (NP1; NP11). The centre roll (20; 20A) is a roll provided with circulation of heating medium (Fin Fout) and with a heated outer mantle. The outer face (21') of the mantle (21) of the centre roll (20; 20A) is heated by means of circulation of medium (Fin Fout) to such a temperature level (TS) that the dewatering of the paper web (W) in the nips (N2, NP1; N2, NP11) placed in connection with the centre roll (20; 20A), in particular in said extended nip (NP1; NP11), is intensified substantially. The invention can also be accomplished in an environment in which there are two or more separate press nips (NP12, NP22), of which nips at least the last nip is an extended nip (Figs. 7 and 7A).

L'invention se rapporte à la section presse d'une machine à papier, cette section presse comprenant une combinaison compacte de rouleaux qui forment entre eux un nombre de lignes de pincement. Ces lignes de pincement éliminent l'eau de la bande de papier (W). Entre ces lignes de pincement, la bande de papier (W) présente une section d'étirage fermée qui est supportée par la toile de la presse ou par la surface du rouleau. La section presse comprend un rouleau central (20; 20A) auquel sont raccordées au moins deux lignes de pincement (N¿2?, NP¿1?; N¿2?, NP¿11?). La dernière ligne de pincement raccordée au rouleau central est une ligne de pincement étendue (NP¿1?; NP¿11?). Le rouleau central (20; 20A) est un rouleau dans lequel circule un milieu chauffant (F¿in? ? F¿out? ) et qui comporte une enveloppe externe chauffée. La face externe (21') de l'enveloppe (21) du rouleau central (20; 20A) est chauffée, par le milieu circulant (F¿in? ? F¿out?), à une température (T¿S?) telle que l'égouttage de la bande de papier (W) dans les lignes de pincement (N¿2?, NP¿1?; N¿2?, NP¿11?) raccordées au rouleau central (20; 20A), notamment dans cette ligne de pincement étendue (NP¿1?; NP¿11?), est sensiblement intensifié. L'invention peut être également réalisée dans un environnement présentant au moins deux lignes de pincement séparées (NP¿12?, NP¿22?) parmi lesquelles au moins la dernière ligne de pincement est une ligne de pincement étendue (Fig. 7 et 7A).

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