FIELD: laminated materials. SUBSTANCE: invention relates to stretching laminated material with zero stretching deformation which is formed under essentially stress-free conditions and which is capable to adapt elasticity state when subjected to mechanical stretching. In method of gradually increasing stretching of laminated material, when sections of material are stretched, adhesion of opposite three-dimensional surfaces of pressure applicators and their pressing to each other are made to a different extent along contact sites of these surfaces with laminated material to ensure nonuniformly increasing stretching of laminated material sections. To this end, pressure applicators with unequally matched opposite three-dimensional surfaces are utilized. In this case, the second layer being stretched is conferred different residual elongation and laminated material is conferred capability of nonuniform elastic stretching in stretching direction at least to the point of initial stretching after stretching force on laminated material is disabled. When continuously moving riffling laminated material is stretched, opposite surfaces of riffled rolls of pressure applicators are adhered to each other with different degree along their contact sites with laminated material. In addition, opposite peripheral sections of laminated material under stretching are fixed to prevent them from contraction in direction parallel to nonuniformly increasing stretching direction. Opposite pressure applicators are utilized in the form of riffled rolls with pivot pins perpendicular to material travel direction and having three-dimensional riffled surfaces differently adhering to each other when laminated material is passed between them. Fixation of material is performed by way of applying suction force to material through vacuum channels on at least one of the riffled rolls. Nonuniformly increasing stretching of material is performed in directions parallel or perpendicular to material travel direction, as well as in multitude of directions and along curvilinear trajectory. Nonuniformly increasing stretching is also employed with laminated material with zero stretching deformation and additionally includes third non-stretched layer capable to be elongated but showing lower elastic capability to restore as compared to the first layer, this additional layer being attached to the surface of the first non-stretched layer opposite to the second layer. EFFECT: facilitated laminated material stretching operation. 15 cl, 8 dwg
