Paper or paperboard laminate and method to produce such a...

Details Paper or paperboard laminate and method to produce such a... Paper or paperboard laminate and method to produce such a...

D - Textiles, Paper

21

H

D21H 27/38 (2006.01) B32B 29/00 (2006.01) B65D 65/40 (2006.01) D21F 11/04 (2006.01)

Patent

CA 2342227

Paper or paperboard laminate composed of at least one bulk-promoting layer, here termed the bulk layer, and on at least one side of the bulk layer at least one secondary layer, secondary layer and bulk layer being joined to one another directly or indirectly over basically the whole of their surfaces facing one another. 40-95 % of the bulk layer consists of cellulose fibres with a freeness of 550-950 ml CSF, the secondary layer/layers has/have a greater density than the bulk layer, and the laminate has a bending stiffness index higher than 2.5 Nm7/kg3, but less than 14 Nm7/kg3, calculated as a geometric mean value for machine and transverse direction. The invention also relates to a method of producing said paper or paperboard laminate.

Papier ou carton stratifié comprenant au moins une couche conférant du volume, désignée ci-après par </= couche bouffante >/= , et, sur au moins une face de cette couche bouffante, au moins une couche secondaire, la couche secondaire et la couche bouffante étant reliées l'une à l'autre directement ou indirectement, essentiellement sur la totalité de leurs surfaces mutuellement opposées. 40-95 % de la couche bouffante sont constitués par des fibres de cellulose avec un degré de raffinage de 550-950 ml CSF, la/ou les couches secondaires ont une densité supérieure à la couche bouffante, le stratifié présentant un indice de rigidité à la flexion supérieur à 2,5 Nm<7>/kg<3>, mais inférieur à 14 Nm<7>/kg<3>, calculé comme moyenne géométrique pour le sens machine et le sens transversal. L'invention concerne également un procédé de fabrication dudit papier ou carton stratifié.

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