Entanglements are used to provide cohesion between filaments in a synthetic yarn. This is a low cost alternative for twisting. When no filament cohesion is present a multifilament yarn would split easily when it is bend or maneuvered. Splitting of yarns is very unpractical during processes like weaving. The amount of entanglements used and the regularity of their occurrence in the yarn can be measured by our rothshild entanglement tester.