A method for producing a multiaxial laid scrim, unidirectional layers, and processes for their preparation, multiaxial skein of yarn and composite part having a matrix

摘要

A known method from fiber engineering is improved in which fibers consisting of a large number of filaments are broadened out into bands (3a, 3b), placed side by side and pulled by a grasper (6) over a transport device in the form of segments (5) cut to size, and are secured thereon by means of an extending-clamping device (16).  The direction of movement of the grasper (6) is denoted by reference number (7) and the required separating device by reference number (9).  The novelty consists in that the bands (3a, 3b) of the segment (5) are combined and set to the side of the segment in an essentially non-bonded manner. A method is provided herein such that the measures for obtaining a transverse cohesion extending laterally across several bands (3a, 3b) are omitted.  However, a transverse cohesion imprinted from the outside can extend across the filaments of a single band (3a, 3b).  In this manner, the bands (3a, 3b) are set aside in a particularly uniform and smooth manner.  When laid by means of the grasper (6), differences in length and tension between the single bands (3a, 3b) are compensated, which would be expressed, for example, as bulges (10).  An additional, short tug on the already almost completely transported segment (5) is possible.  The retention force for tightening can be applied by a braked supply coil of the starting material.  The illustration ‘a’ denotes the state of the segment before the compensation movement, illustration ‘b’ denotes the state thereafter.