Method and apparatus at a twin-wire press

D - Textiles – Paper – 21 – F

Patent

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D21F 1/80 (2006.01)

Patent

CA 2523066

The present invention relates to a method for dewatering of a fibre suspension in a twin-wire press (2), according to which method the fibre suspension is fed to an oblong dewatering space (4), that is defined by an endless lower wire (6) and an endless upper wire (8) of the twin-wire press, against which wires lower and upper perforated dewatering elements are arranged outside the dewatering space, and the fibre suspension is dewatered in the dewatering space (4) during displacement of the wires, such that a flow of filtrate from the dewatering space (4) through the wires (6, 8) and the perforated dewatering elements is formed, filtrate that flows from the dewatering space through the wires is collected in outlet boxes (18, 20), that the pressure difference between the dewatering space (4) and at least an outlet box (18, 20) is adjusted by controlling at least a counter pressure that is applied on at least a portion of the flow of filtrate. In this respect the dewatering is optimised and the built-up of the fibre web is improved. The present invention also relates to a twin-wire press for carrying out the method.

L'invention concerne un procédé d'essorage de suspension de fibre dans une machine à deux toiles (2), avec injection de la suspension dans un espace d'essorage oblong (4), défini par une toile inférieure sans fin (6) et une toile supérieure sans fin (8). Contres ces toiles, des éléments d'essorage perforés sont disposés en dehors de l'espace, et la suspension est essorée dans l'espace (4) durant le déplacement des toiles, de sorte qu'un flux de filtrat se forme depuis l'espace (4) à travers les toiles (6, 8) et les éléments d'essorage. Le filtrat qui s'écoule ainsi est recueilli dans des coffrets de sortie (18, 20), et la différence de pression entre l'espace (4) et au moins un coffret de sortie (18, 20) est réglée par contrôle d'au moins une contrepression appliquée au moins à une partie du flux. On optimise ainsi l'essorage et on améliore la formation de bande de fibre. L'invention concerne également une machine à deux toiles utilisée pour la mise en oeuvre du procédé.

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