Cellulose-based fibrous materials

D - Textiles – Paper – 21 – D

Patent

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Details

D21D 1/20 (2006.01) D21H 11/16 (2006.01)

Patent

CA 2650044

The invention provides a cellulose-base fibrous material for the production of high-opacity paper and sheeting which have low density and excellent surface characteristics and exhibit excellent dimensional stability in spite of their having high strength. A fibrous material made mainly of a cellulose having a scaly outer fibril made of a microfibril aggregate exhibits a higher fiber stiffness than that of a fibrous material having a yarn-type outer fibril at the same freeness level and has a lower water retention and a larger specific surface area than those of the latter material. Use of the fibrous material of the invention brings about paper and sheeting which have low density, excellent surface characteristics, excellent dimensional stability, and high opacity.

La présente invention concerne un matériau fibreux à base de cellulose destiné à la production de papier et de feuille possédant une opacité élevé, une faible densité, d'excellentes caractéristiques de surface et une excellente stabilité dimensionnelle malgré leur résistance élevée. Un matériau fibreux, obtenu principalement à partir de cellulose possédant une fibrille externe écailleuse formée par un agrégat de microfibrilles, présente une rigidité de fibre supérieure à celle d'un matériau fibreux possédant une fibrille externe de type fil pour le même degré de raffinage et possède une zone de rétention d'eau inférieure et une zone spécifique supérieure à celles de ce dernier matériau. L'utilisation du matériau fibreux de l'invention permet la production de papier et de feuille de faible densité possédant d'excellentes caractéristiques de surface, une excellente stabilité dimensionnelle et une opacité élevée.

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