STITCHED MULTIAXIAL MULTILAYER NONWOVEN FABRIC Russian patent published in 2015 - IPC D04B21/16 

FIELD: textiles, paper.

SUBSTANCE: invention relates to a multiaxial multilayer nonwoven fabric of at least two layers located one above the other, of complex reinforcing filaments located in the layers parallel to each other and adjacent to each other, at that the reinforcement filaments in one layer and also in the adjacent layers are connected to each other and fixed relative to each other by means of sewing threads extending parallel to each other spaced apart by the stitch width (w). The sewing threads form loops with a stitch length (s) and determine the direction of zero degree of the multilayer nonwoven fabric. The reinforcing filaments of the layers of relative to the direction of zero degree of the multilayer nonwoven fabric are located symmetrically and in their direction form an angle (α)with a direction of zero degree, which is not equal to 90° and not equal to 0°. The sewing threads have a titre in the range from 10 to 35 dtex. Also the invention relates to a preform from this multiaxial multilayer nonwoven fabric.

EFFECT: invention provides improvement of properties of structural elements or production materials, particularly when the shock load and the compression load.

14 cl, 2 dwg, 4 tbl