Improving the strength of paper and board products

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 13/12 (2006.01) D21H 13/16 (2006.01) D21H 17/63 (2006.01) D21H 17/67 (2006.01) D21H 17/70 (2006.01) D21H 19/10 (2006.01) D21H 19/12 (2006.01) D21H 19/60 (2006.01) D21H 21/18 (2006.01) D21H 23/66 (2006.01) D21H 23/70 (2006.01) D21H 23/76 (2006.01) D21H 27/30 (2006.01)

Patent

CA 2762024

The present invention concerns a paper or board product with an improved tensile strength comprising cellulose fibres, one or more zirconium carbonate compound(s) and water-insoluble polyvinyl alcohol fibres, and a process for manufacturing such a product, comprising the steps of forming a combined aqueous suspension of cellulose fibres and water-insoluble polyvinyl alcohol fibres, and pressing it into a paper or board product, or pressing layers of water-insoluble polyvinyl alcohol fibres and cellulose fibres into a product having a sandwich-structure, and treating the product before drying with an aqueous solution of a zirconium carbonate compound by impregnating one or more of the surfaces of the product or the complete product with the solution.

La présente invention porte sur un produit en papier ou en carton avec une résistance à la traction améliorée, lequel produit comprend des fibres de cellulose, un ou plusieurs composés de carbonate de zirconium et des fibres d'alcool polyvinylique insolubles dans l'eau, et sur un procédé pour la fabrication d'un tel produit, lequel procédé comprend les étapes de formation d'une suspension aqueuse combinée de fibres de cellulose et de fibres d'alcool polyvinylique insolubles dans l'eau et de pressage de celles-ci sous la forme d'un produit en papier ou en carton, ou de pressage de couches de fibres d'alcool polyvinylique insolubles dans l'eau et de fibres de cellulose sous la forme d'un produit ayant une structure en sandwich, et de traitement du produit avant le séchage avec une solution aqueuse d'un composé de carbonate de zirconium par imprégnation de l'une ou de toutes les surfaces du produit ou du produit fini avec la solution.

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