Low density paperboard sheet and tube incorporating the same

D - Textiles – Paper – 21 – H

Patent

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Details

D21H 17/02 (2006.01) B32B 29/00 (2006.01) D21H 27/30 (2006.01)

Patent

CA 2537863

The present invention provides a low-density paperboard sheet of at least one paperboard layer made from a stock solution that includes a proportion of standard wood flour or fine sawdust in addition to traditional cellulose fibers. The proportion of sawdust can range from 1% to 40% by weight. Advantageously the sawdust of the present invention does not require a costly refining or micronization operation in order to produce low-density, high yield paperboard layers. Additionally, the low-density layers of the present invention may be readily combined with other layers of varying densities in order to tailor the physical properties of the resulting multi-layer sheet to a given application.

La présente invention concerne une feuille de carton à faible densité qui est constituée d'au moins une couche de carton obtenue à partir d'une solution de réserve qui comprend une certaine proportion de farine de bois standard ou de la sciure fine, ainsi que des fibres cellulosiques classiques. La proportion de sciure s'élève de 1 % à 40 % en poids. L'utilisation de sciure présente l'avantage qu'aucune opération de raffinage ou de micronisation coûteuse n'est nécessaire pour produire des couches de carton à faible densité avec un rendement élevé. De plus, les couches à faible densité selon cette invention peuvent facilement être combinées à d'autres couches de diverses densités, afin de d'adapter les propriétés physiques de la feuille multicouche résultante à une application donnée.

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