Migration of Fibers in Yarns. Part VIII : Experimental Study on a 3-Layer Structure of 19 Filaments

A study was made of the migration behavior of filaments in a 3-layer structure of 19 filaments. The filaments were twisted in two distinct forms: (a) ribbon-twisted and (b) cylindrical-twisted. The form of twisting was found to have an appreciable effect on the migration behavior of filaments. The frequency of migration decreases with increase in ribbon width and free length. The experimental results and the observation of yarn formation indicate that, besides the presence of three principal mechanisms, the migration is also caused by the entanglement of filaments. Tensile pro perties of twisted continuous-filament yarns are affected slightly with change in migration behavior.