Patent ID: 7387702

Claim:
A paper or paperboard laminate comprising: at least one bulk-promoting layer, here termed bulk layer, 40-98% of which is composed of cellulose fibers with a freeness value of 550-950 ml CSF; at least one secondary layer on at least one side of the bulk layer, the secondary layer having a greater density than the bulk layer, the secondary layer and bulk layer being joined indirectly to one another over essentially the entire of their opposing surfaces as a laminate, the laminate having a bending stiffness index greater than 2.5 Nm 7 /kg 3 , but less than 14 Nm 7 /kg 3 , calculated as a geometric mean value for machine direction and cross direction; and a thin intermediate fiber layer between the said bulk layer and said secondary layer, said intermediate layer having a higher drainage resistance than the bulk layer, and which has a basis weight of at least 2 g/m 2 but less than 20 g/m 2 and which has been formed together with the bulk layer, the fibers of the intermediate layer being partially oriented in the z-direction of the laminate and mixed with and anchored in a fiber surface of the bulk layer.