Press shoe

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 3/02 (2006.01)

Patent

CA 2125047

A press shoe for a shoe press with extended nip, said press shoe is of combined hydrostatic and hydrodynamic type and has a plurality of hydrostatic pressure pockets (18), each of which is preceded by a leading land surface (19) and followed by a trailing land surface (20) and into which lubricant is supplied under pressure. According to the invention each pressure pocket (18) has a first pocket zone (26) in which a hydrodynamic pressure shall be created and which comprises a bottom surface (28) located at gradually decreasing depth from the concave surface portion (4) of the press shoe (3) seen in the direction of rotation of the belt member (1), said depth being zero at the trailing end (t6) of the pressure pocket (18). The bottom surface forms an angle .alpha. of from 0° to about 2° with a tangent (29) to the concave surface portion (4) of the press shoe (3) at the trailing end (t6) of the pressure pocket (18). Further, the first pocket zone (26) is preceded by a second pocket zone (27) comprising a plane bottom surface (30) forming an angle .beta. of from 0° to about ~ 10° with a plane that coincides with the bottom surface (28) of the first pocket zone (26).

Semelle de presse pour utilisation dans presse à semelle à contact étendu. Ladite semelle de presse est des types hydrostatique et hydrodynamiques combinés, et comportant plusieurs poches de pression hydrostatiques (18) chacune étant précédée d'une surface d'appui avant (19) et d'une surface d'appui arrière (20) et dans lesquelles un lubrifiant est refoulé sous pression. Selon l'invention, chaque poche de pression (18) comprend une première zone (26) dans laquelle une pression hydrodynamique sera crée et qui comprend une surface inférieure, (28) à une profondeur décroissante à partir de la partie de la surface concave (4) de la semelle de presse (3) observé dans le sens de rotation de l'élément de courroie (1), la dite pression étant nulle à l'extrémité arrière, (t6) de la poche de pression (18). La surface du fond forme un angle alpha de 0 degrés à environ 2 degrés, une tangente (29) à la surface concave de la semelle (3) de presse (4) à l'extrémité arrière (t6) de la poche de pression (18), de plus, la première zone (26) est précédée d'une deuxième zone (27) comprenant une surface de fond en plan (30) formant un angle bêta de 0 degré à environ 10 degrés avec un plan coïncidant avec la surface de fond (28) de la première zone.

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