Extended nip press with oscillating blanket for extended wear

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 3/02 (2006.01)

Patent

CA 2257574

An Extended Nip-type press (20) has a blanket (30) which passes over a shoe (22) which is urged against a backing roll (24) to form a press nip (56). A hydraulic system (70) and controller (94) provides for automatic continuous oscillation of the blanket (30) in the cross machine direction. The oscillation results in a region of high fatigue (58, 59) continuously moving over the blanket (30) surface so that the amount of time any particular region sees wear is minimized. Positioning of the heads (38, 42) to which the blanket (30) ends are mounted is controlled by hydraulic pistons (60, 62) mounted between a support beam (26) and the heads (38, 42). A controller (94) operates a valve (74) to reverse the direction of motion of the blanket (30) when sensors (92, 98) indicate one end of the blanket (30) has reached a stop (64, 80). A throttle valve (86) controls the rate at which hydraulic fluid is supplied to the cylinders (60, 62) which urge the head (38, 42) away from the shoe (22).

Cette invention se rapporte à une presse à pince allongée (20) comprenant un blanchet (30) qui passe sur un sabot (22), lequel est plaqué contre un rouleau de soutien (24) afin de former une pince de presse (56). Un système hydraulique (70) et une unité de commande (94) créent une oscillation continue automatique du blanchet (30) dans la direction perpendiculaire à la fabrication. Cette oscillation entraîne la création d'une zone de fatigue élevée (58, 59) se déplaçant en continu sur la surface du blanchet (30), pour que la durée pendant laquelle chaque région subit une usure soit réduite au minimum. Le positionnement des têtes (38, 42) sur lesquelles sont montées les extrémités du blanchet (30) est commandé par des pistons hydrauliques (60, 62) montés entre une barre de support (26) et lesdites têtes (38, 42). Une unité de commande (94) actionne une valve (74) afin d'inverser la direction de mouvement du blanchet (30), lorsque des capteurs (92, 98) indiquent qu'une des extrémités du blanchet (30) a atteint une butée (64, 80). Une valve à étranglement (86) commande la vitesse à laquelle le fluide hydraulique arrive aux cylindres (60, 62), qui éloignent la tête (38, 42) du sabot (22).

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