Process for the production of a multilayer fiber web from...

Details Process for the production of a multilayer fiber web from... Process for the production of a multilayer fiber web from...

D - Textiles, Paper

21

H

D21H 21/10 (2006.01) D21F 11/04 (2006.01)

Patent

CA 2665712

The invention relates to the production of a multi layer fiber web from cellulose fibers by separately feeding of at least two different fiber suspensions and water into a multi layer head box, wherein separating elements separate them from each other and from the water. After leaving the nozzle mouth of the head box, they are transported to a device on which a web is formed. The water is guided in a way, such that it ends up in form of a layer between two layers of fiber suspensions on the web forming device after exiting the nozzle mouth and thus prevents mixing of the different fiber suspensions. At least one retention agent and/or at least one dehydrating agent is dosed to the fiber suspension and/or to the added water to increase the retention, dehydration and formation.

L'invention concerne un procédé pour la fabrication d'une bande de matière fibreuse multicouche à partir de fibres cellulosiques grâce à l'alimentation séparée d'au moins deux suspensions fibreuses différentes et d'eau dans un caisson de passage de substance multicouche, dans lequel elles sont séparées de l'eau et l'une de l'autre par des éléments de séparation, et parvient à un dispositif, sur lequel une bande est formée, après avoir quitté le nez de filière du caisson de passage de substance, l'eau étant amenée de sorte de manière à parvenir en aval de la sortie du nez de filière sous la forme d'une couche entre deux couches de suspensions fibreuses sur le dispositif de formation de bande, et empèche ainsi le mélange des diverses suspensions fibreuses, au moins un agent de rétention et/ou au moins un agent déshydratant étant dosé dans les suspensions fibreuses et/ou dans l'eau ajoutée.

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