D - Textiles – Paper – 21 – D
Patent
D - Textiles, Paper
21
D
D21D 5/02 (2006.01)
Patent
CA 2397327
The present invention relates to a screening device for fiber suspensions, comprising a housing (1) with a screening means (5) and a rotary rotor (6) provided with pulsation wings (9) located at the screening means (5), whereby a screening zone (7) is formed along the screening means (5). The screening device comprises also inlet (2) for the fiber suspension, inject, a reject chamber (12) with a reject outlet (4) for reject and an accept chamber (11) with outlet (3) for screened fiber suspension. Every pulsation wing (9) has a lower edge (24) to the reject chamber (12) and an outside (22) and an inside (23), where the outside (22) faces the screening means (5). At least one pulsation wing (9) is formed so that the pressure difference between the outside (22) and inside (23) of the pulsation wing (9) at least partially decreases at the lower portion of the pulsation wing (9) in the direction to the lower edge (24), in order to prevent reject from the reject chamber (12) to flow up in the screening zone (7).
L'invention concerne un dispositif de criblage pour des suspensions des fibres, comprenant un logement (1) doté de moyens de criblage (5), et un rotor rotatif (6) pourvu d'ailettes de pulsation (9) situées au niveau des moyens de criblage (5), une zone de criblage (7) étant créée le long desdits moyens de criblage (5). Le dispositif de criblage comprend une entrée (2) permettant d'injecter la suspension de fibres, une chambre de rejet (12) dotée d'une sortie de rejet (4), et une chambre d'acceptation (11) dotée d'une sortie (3) de suspension de fibres criblée. Chaque ailette de pulsation (9) possède un bord inférieur (24) orienté vers la chambre de rejet (12), une partie extérieure (22) et une partie intérieure (23), ladite partie extérieure (22) faisant face aux moyens de criblage (5). Une ailette de pulsation (9) au moins est formée de sorte que la différence de pression entre la partie extérieure (22) et la partie intérieure (23) de l'ailette de pulsation (9) diminue au moins partiellement au niveau de la partie inférieure de ladite ailette de pulsation (9) dans le sens du bord inférieur (24), de façon à empêcher que le rejet de la chambre de rejet (12) ne s'écoule dans la zone de criblage (7).
Fetherstonhaugh & Co.
Valmet Fibertech Ab
LandOfFree
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