METHOD OF GRADUALLY GROWING TENSION OF LAMINATED MATERIAL WITH ZERO TENSILE STRAIN AND DEVICE FOR ITS REALIZATION Russian patent published in 1997 - IPC

FIELD: method and device for tension of laminated material with zero tensile strains, which is fixed in essentially unstrained conditions and can acquire the state of elasticity under the action of mechanical expansion. SUBSTANCE: in the method of gradually growing tension of laminated material with zero tensile strain for imparting elasticity to it in the direction of tension at least to the point of initial tension in the process of tension the opposite peripheral edge sections of the second layer adjoining the section of laminated material with zero tensile strain being tensioned are fixed. It prevents their slippage or reduction in the direction parallel to the direction of tension. Laminated material with zero tensile strain is fed continuously. For tension of laminated material use is made of opposite pressure applicators in the form of rugged rolls. The rugged rolls have axes of rotation perpendicular to the direction of material movement, and three-dimensional surfaces with groovings, which at least to a certain degree are conjugate to one another. Tension is effected by coupling to a certain degree of the groovings on the rugged rolls of the opposite pressure applicators at a passage of continuously moving laminated material between them. In the process of tension effected is an additional fixing of the opposite peripheral edge sections of the first layer capable of tensioning adjacent to the section of continuously moving laminated material being tensioned. Fixing of the second layer is accomplished by application of suction forces to its opposite peripheral edge layers at least through one of the rugged rolls. Other methods of fixing, as well as directions in which material tension is effected, ate also provided. The device for gradually growing tension of laminated material with zero strain is furnished with a means for fixing the peripheral edge sections at least of the second elongated layer adjacent to the section of stratified material with zero strain being tensioned. EFFECT: prevented slippage or reduction in the direction essentially parallel to the direction of tension. 13 cl, 11 dwg