High speed former head

Details High speed former head High speed former head

D - Textiles, Paper

04

H

D04H 1/72 (2006.01) D01G 25/00 (2006.01) D04H 1/70 (2006.01)

Patent

CA 2457923

It is the purpose of the invention to indicate a former head (2) for dry forming fibrous tissue, where a fibre material mixed with air is introduced to at least one rotating drum (4) in a former head by injection, where the drum (4) is provided internally with means (6, 16, 18, 20) for fluidising the fibres injected. By the invention is achieved a higher production capacity and simultaneously an increased distribution quality of the fibres. Thus it is possible to have a former head (2) with high capacity and an increased width, preferably over four meters. The known problems with natural oscillations in the needle rollers are avoided in that they are substituted by so-called slotted air nozzles (6). The slotted air nozzles (6) extend along the drum (4) in the whole length and are provided with adjustable (20) nozzle lips (18) in order to regulate the amount of air and direction of the air flow blown through the perforations of the drum. Hereby is achieved the surprising effect that the capacity of the former head is markedly higher compared with the prior art, and that the distributing quality also is markedly better than by high-speed operation of traditional machines.

L'invention concerne une tête de formation (2) permettant de former un tissu fibreux à sec. A cet effet, on introduit une matière fibreuse mélangée avec de l'air par injection dans au moins un tambour rotatif (4) d'une tête de formation, le tambour (4) comprenant étant intérieurement pourvu d'organes (6, 16, 18, 20) permettant de fluidifier les fibres injectées. Cette invention permet d'accroître la capacité de production et simultanément d'augmenter la qualité de distribution des fibres. On peut ainsi obtenir une tête de formation (2) présentant une capacité élevée et une plus grande largeur, dépassant de préférence quatre mètres et éviter les problèmes dus aux oscillations naturelles survenant dans les aiguilles de roulement en remplaçant ces dernières par des buses d'aération à fentes (6). Ces buses d'aération à fentes (6), qui s'étendent sur toute la longueur du tambour (4), sont pourvues de lèvres (18) réglables (20) qui permettent de réguler la quantité d'air et de régler la direction de l'écoulement de l'air passant à travers les perforations du tambour. Le résultant obtenu est étonnant : la capacité de la tête de formation est sensiblement supérieure à celle de la technique antérieure et la qualité de distribution est également sensiblement meilleure par rapport aux machines classiques fonctionnant à grande vitesse.

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