Procedure and apparatus in dry forming of fibre layer

D - Textiles – Paper – 21 – H

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Details

D21H 27/00 (2006.01) D01G 25/00 (2006.01) D04H 1/72 (2006.01)

Patent

CA 2555879

The invention relates to a procedure and an apparatus in dry formation of a fibre layer, in which procedure fibre-containing air is passed through a forming wire (7) moving via a former (2) or an equivalent distributor unit and further through a suction box (8) or equivalent placed below the forming wire, and which air is circulated back to the upper part of the same or another former. In the solution of the invention, the air circulated through the suction box (8) is passed to the upper part of the former via channels (17) with an adjustable flow rate.

L'invention concerne un procédé et un appareil pour la formation par voie sèche d'une couche de fibres. Dans ce procédé, on fait passer de l'air contenant des fibres à travers une toile de formation (7) se déplaçant au moyen d'un formeur (2) ou d'une unité de distribution équivalente puis à travers une caisse aspirante (8) ou similaire placée en dessous de la toile de formation. Cet air est ensuite circulé en retour vers la partie supérieure du même formeur ou d'un autre formeur. Dans cette invention, l'air circulant à travers la caisse aspirante (8) passe vers la partie supérieure du formeur par l'intermédiaire de canaux (17), avec un débit d'écoulement réglable.

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