Sheet-formed fibrous material with improved strength property

Details Sheet-formed fibrous material with improved strength property Sheet-formed fibrous material with improved strength property

C - Chemistry, Metallurgy

09

D

C09D 101/28 (2006.01) C08B 15/00 (2006.01) C08B 15/10 (2006.01) C08L 1/02 (2006.01) D21C 9/00 (2006.01) D21H 11/20 (2006.01)

Patent

CA 2719165

A method of improving a strength property of a sheet-formed fibrous material formed from an aqueous slurry of cellulose fiber, comprising coating at least one face of the material with a coating formulation comprising a or consisting of polysaccharide containing at least two carboxylic groups and low molecular weight organic mono-, di- or poly-carboxylic acid in an aqueous carrier, keeping the coated face at a temperature of 50 °C or more for a time sufficient to obtain the desired improvement including drying of the material.

Le procédé ci-décrit permet d'améliorer une propriété de résistance mécanique d'un matériau fibreux en feuille formé à partir d'une suspension aqueuse épaisse de fibres cellulosiques. Le procédé selon l'invention comprend les étapes suivantes : le revêtement d'au moins une face du matériau avec une formulation de revêtement comprenant ou consistant en un polysaccharide contenant au moins deux groupes carboxyliques et un acide organique mono-, di- ou poly-carboxylique de bas poids moléculaire dans un véhicule aqueux ; et le maintien de la face revêtue à une température de 50°C ou plus pendant un temps suffisant pour obtenir l'amélioration souhaitée, et notamment pour sécher le matériau.

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