Shoe for an extended-nip press

Details Shoe for an extended-nip press Shoe for an extended-nip press

D - Textiles, Paper

21

F

D21F 3/00 (2006.01) D21F 3/02 (2006.01)

Patent

CA 2112607

ABSTRACT A shoe in an extended-nip press arranged to be placed in a nip between a back-up roll and a belt-mantle roll inside the belt mantle. The shoe is pressed by an actuator, e.g., a cylinder device, towards the back-up roll, while the web/felt or felts is/are placed between the back-up roll and the belt mantle. The shoe has at least one chamber provided for hydraulic fluid into which a fluid is passed from a duct. The shoe has a first curved face, whose curve radius is substantially equal to the curve form of the back-up roll. The shoe has a second face which forms the bottom of the chamber provided for hydraulic fluid. The second face joins the first face and has a larger curve radius than the first face. At a joint between the first face and the second face, the tangents of the faces are substantially the same.

La présente invention se rapporte à un sabot destiné à une presse à pince allongée et placé à l'intérieur de la pince, entre le rouleau d'appui et le rouleau situé à l'intérieur du support de courroie. Un actionneur, p. ex. un dispositif cylindrique, appuie le sabot contre le rouleau d'appui, tandis que le matelas fibreux ou les feutres sont placés entre le rouleau d'appui et le support de courroie. Le sabot comporte au moins un compartiment recevant le fluide hydraulique acheminé par un conduit. Le sabot présente une première face courbe dont le rayon de courbure est sensiblement équivalent à la courbe du rouleau d'appui. Il présente également une deuxième face qui forme le fond du compartiment pour fluide hydraulique. La deuxième face est jointe à la première face et a un rayon de courbure plus important que celui de la première face. Au joint entre la première face et la deuxième face, les tangentes des faces sont essentiellement les mêmes.

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