THREE DIMENSIONALLY STRUCTURED NON-WOVEN FIBER AGGREGATE ANDPROCESS FOR ITS MANUFACTURE

摘要

The invention relates to a flat nonwoven fiber aggregate with three- dimensional structure which consists of filament layers which alternate perpendicularly to the plane of the surface and layers of denser short fiber s which are thermally bound to said filament layers in a flat or dotwise manne r. Said wide-meshed filament layers represent a loose structure, a grid or a we b. Said layer of short fibers are characterized by repetitive crease- or wave- shaped elevations. According the inventive method, all layers of the laminat e are subjected to a common shrinkage process at a temperature that lies betwe en the softening and the melting temperature of the material of the loose structure.