Paper or paperboard laminate and method of producing such a...

D - Textiles – Paper – 21 – H

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D21H 27/38 (2006.01) B32B 29/00 (2006.01) B32B 29/02 (2006.01) B65D 65/40 (2006.01) D21H 27/34 (2006.01) D21H 11/02 (2006.01)

Patent

CA 2408927

Paper or paperboard laminate composed of at least one bulk-promoting layer, here termed bulk layer (1), 40-98% of which is composed of cellulose fibres with a freeness value of 550-950 ml CSF, and on at least one side of the bulk layer at least one secondary layer (3a, 3b'), which has a greater density than the bulk layer, the secondary layer and bulk layer being joined indirectly to one another over basically the whole of their opposing surfaces and the laminate having a bending stiffness index greater than 2.5 Nm7/kg3, but less than 14 Nm7/kg3, calculated as a geometric mean value for machine direction and cross direction. According to the invention a thin intermediate layer (2a), which has a higher drainage resistance than the bulk layer and has been formed together with the bulk layer, is arranged between the said bulk layer (1) and secondary layer (3a, 3b').

L'invention concerne un papier ou un carton stratifié comprenant au moins une couche conférant du bouffant, appelée ici couche (1) de bouffant, composée à raison de 40-98 % de fibres de cellulose présentant un indice d'égouttage de 550-950 ml CSF, et au moins d'un côté de cette couche de bouffant, au moins une couche (3a, 3b') secondaire dont la densité est supérieure à celle de la couche de bouffant. La couche secondaire et la couche de bouffant sont assemblées indirectement l'une à l'autre sur la quasi totalité de leurs surfaces adjacentes, et ce stratifié présente un indice de rigidité à la flexion supérieur à 2,5 Nm?7¿/kg?3¿, mais inférieur à 14 Nm?7¿/kg?3¿, cette indice représentant une valeur géométrique moyenne pour le sens machine et le sens transversal. Une fine couche (2a) intermédiaire présentant une résistance à l'égouttage supérieure à la couche de bouffant, formée conjointement à la couche de bouffant, est disposée entre cette couche (1) de bouffant et la couche (3a, 3b') secondaire.

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