Paper stock screening apparatus and method

B - Operations – Transporting – 07 – B

Patent

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Details

B07B 1/04 (2006.01) B01D 29/35 (2006.01) D21D 5/02 (2006.01)

Patent

CA 2297744

Pressure screening apparatus for screening a suspension of paper fiber stock employs a rotor (14, 15, 16) in which a single impulse or foil member (12) is carried or positioned to move along a discrete portion of the screen surface (10). This arrangement improves efficiency of operation of the pressure screen by reducing the rotational effect of the rotor (14, 15, 16) on the stock suspension being screened and by providing a less disturbed screening region through which the single foil (12) operates. Embodiments are shown in which a single foil (12) is combined, in screening apparatus, with multiple foils in accordance with the increase in consistency of the stock as it passes through the screen (10).

Un épurateur sous pression utilisé pour épurer une suspension de pâte de fibres à papier comprend un rotor (14, 15, 16) dans lequel un seul corps fuselé ou un seul élément (12) de forme aérodynamique est supporté ou bien placé pour se déplacer sur une partie discontinue de la surface (10) du tamis. Cette construction améliore l'efficacité du fonctionnement de l'épurateur sous pression étant donné qu'elle réduit l'effet rotationnel du rotor (14, 15, 16) sur la suspension de pâte en cours de classement et étant donnée qu'elle produit une région de criblage moins perturbée dans laquelle opère l'unique corps fuselé (12). On présente dans cette invention des formes de réalisation dans lesquelles on combine dans l'épurateur un unique corps fuselé (12) avec plusieurs corps fuselés en fonction de l'augmentation de la consistance de la pâte lorsqu'elle traverse le tamis (10).

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