A method and a system for manufacturing broad airlaid paper...

D - Textiles – Paper – 21 – H

Patent

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D21H 21/22 (2006.01) A61F 13/15 (2006.01) A61L 15/60 (2006.01) D04H 1/04 (2006.01) D21F 9/00 (2006.01) D21H 17/00 (2006.01)

Patent

CA 2199358

In production of airlaid paper webs it is possible to add super absorbing powder materials, typically by addition either beforehand, to the fibre material to be distributed, or subsequently, viz. to the top side of an already formed web, between successively formed layers thereof. Both methods involve drawbacks, and with the invention it has been recognized that it is advantageous to introduce the powder material at an intermediate stage between the initial supply of the fibres to the airlaying unit and the final formation of the web; thus, a first coarse distribution of the powder is effected, independently of the initial supply of the fibre material, while the final distribution of the powder is effected by means of the same air flows which cause the final distribution of the fibre material for forming the even web layer. In this manner the powder is effectively mixed evenly into the fibre material.

Dans la production de nappes de papier formées par jet d'air, on peut généralement ajouter des matériaux en poudre très absorbants au matériau fibreux avant sa répartition ou après sa répartition; dans ce dernier cas, ledit matériau en poudre est ajouté au côté supérieur de couches successives constituant une nappe. Ces deux méthodes possèdent des inconvénients, et grâce à cette invention, on a reconnu qu'il était avantageux d'introduire le matériau en poudre à un stade intermédiaire de la fabrication de la nappe, entre la fourniture initiale des fibres à l'unité d'application de celles-ci par jet d'air et la formation finale de la nappe; ainsi, on effectue obligatoirement une première répartition grossière de la poudre, indépendamment de la fourniture initiale des fibres, tandis qu'on effectue la répartition finale de la poudre au moyen des mêmes jets d'air que ceux aidant à la répartition finale des fibres, afin de former la couche régulière de la nappe. De cette manière, la poudre est effectivement mélangée de manière régulière dans les fibres.

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