Paper products and methods for applying chemical additives...

Details Paper products and methods for applying chemical additives... Paper products and methods for applying chemical additives...

D - Textiles, Paper

21

H

D21H 23/04 (2006.01) D21H 17/00 (2006.01) D21H 21/20 (2006.01) D21H 21/22 (2006.01) D21H 27/38 (2006.01)

Patent

CA 2310692

Chemical additives can be adsorbed on cellulosic papermaking fibers at high levels with a minimal amount of unadsorbed chemical additives present in the papermaking process water. A method includes treating a fiber slurry with an excess of the chemical additive, allowing sufficient residence time for adsorption to occur, filtering the slurry to remove unadsorbed chemical additives, and redispersing the filtered pulp with fresh water. Filtrate from the thickening process contains unadsorbed chemical additive and it is not sent forward in the process with the chemically treated fibers. The method can be employed to make improved paper products.

Des additifs chimiques peuvent être adsorbés en grande quantité sur les fibres cellulosiques entrant dans la fabrication du papier, avec une dose minimale d'additifs chimiques non adsorbés subsistant dans l'eau utilisée pour la fabrication du papier. Cette invention concerne un procédé consistant à traiter un boue de fibres au moyen d'une quantité excédentaire d'additifs chimiques, en prévoyant un temps de séjour suffisant pour que l'adsorption ait lieu et; à procéder à une redispersion à l'eau douce de la pulpe filtrée. Le filtrat résultant du processus d'épaississement, qui renferme l'additif chimique non adsorbé, n'est pas réintroduit avec les fibres traitées chimiquement dans le processus de traitement. Ce procédé convient pour la fabrication de produits de papier améliorés.

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