FIELD: pulp and paper industry.
SUBSTANCE: the invention is dealt with a pulp and paper industry. The paper or cardboard laminate contains at least one forming volume layer called as a volumetric layer, consisting by 40-98 % from cellulose fibers with a milling degree equal to 550-950 ml according to the Canadian standard device, and at least one secondary layer located at least on one side of the volumetric layer and having a higher density, as compared with the volumetric layer. The secondary layer and the basic layer are fused to each other in essence by all their opposite surfaces, and the laminate has a factor of rigidity at bending exceeding 2.5 Nm7/kg3, but less than 14 Nm7/kg3, calculated as a geometric average value for a longitudinal direction and a transverse direction. According to the invention, between the volumetric layer and the secondary layer there is a thin intermediate layer, which has the bigger value of resistance to removal of water, than the volumetric layer, and the basic weight at least of 2 g/m2 but less than 20 g/m2 and which is formed together with the volumetric layer. The invention also offers a method of production of paper or cardboard laminate and ensures achievement of a high strength at the low share of a binder, and also prevention of wrinkles.
EFFECT: the invention ensures achievement of a high strength of the laminate at the low content of a binder and prevention of wrinkles.
27 cl, 17 dwg, 6 tbl, 3 ex
