A method of and an apparatus for protecting the jacket upon...

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 3/02 (2006.01) D21F 7/04 (2006.01)

Patent

CA 2429187

In a roll nip (5) formed between a shoe press roll (1) having a concave, plane or slightly convex press shoe (11), a flexible jacket (15) and a hot counter roll (3), the jacket (15) may be damaged by the heat from the counter roll (3) upon a web break. To avoid this, the roll nip (5) is opened by removing one of the press shoe (11) and the hot counter roll (3) from the other, so that the jacket (15) resumes a generally cylindrical shape having an arched portion located across the shoe (11). Then, a force is applied inside the roll jacket (15), directed away from the roll nip (5), to tension the roll jacket (15) over the leading edge and the trailing edge of the press shoe (11), so as to reduce the height of arch of the arched portion over the shoe (11) sufficiently to ensure removal of the jacket (15) from contact with the hot counter roll (3). Preferably, the force against the inside of the jacket is applied by means of a tensioning shoe (61). Suitably, the tensioning shoe is operated by a linear actuator (59), e.g. a fluid actuator, carried by a support beam (17) that extends axially through the flexible jacket (15).

Dans une ligne de contact (5) entre un rouleau presseur (1) pourvu d'un sabot presseur (11) concave, plan ou légèrement convexe, d'une chemise flexible (15) et d'un contre-rouleau (3) chaud, la chemise (15) peut être endommagée par la chaleur du contre-rouleau (3) dès la rupture de la bande. Pour éviter cela, on ouvre la ligne de contact (5) entre rouleaux en retirant le contre-rouleau chaud (3) du sabot (11), de telle façon que la chemise (15) reprenne une forme généralement cylindrique ayant une position arquée située à travers le sabot (11). Ensuite, une force est appliquée à l'intérieur de la chemise (15) et dirigée en s'éloignant de la ligne de contact (5), pour tendre la chemise (15) au-dessus du bord avant et du bord arrière du sabot (11), de manière à réduire suffisamment la hauteur de la position arquée au-dessus du sabot (11) pour pouvoir retirer la chemise (15) du contact avec le contre-rouleau chaud (3). De préférence, la force exercée à l'intérieur de la chemise est appliquée par un sabot tendeur (61). Le sabot tendeur est avantageusement commandé par un actionneur linéaire (59), notamment un actionneur fluide, porté par une poutre support (17) qui s'étend axialement à travers la chemise flexible (15).

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