Twisting mechanisms of open-end rotor spun hybrid yarns

We have developed a mechanical hybrid yarn spinning system that produces different kinds of yarn on a modified open-end rotor spinning frame. In order to understand the characteristics of hybrid yarn and produce novel yarns, it is necessary to investigate yarn formation and the twisting mechanism in the spinning rotor during yarn production. Our results reveal that the rotor revolution generally results in combining the filament yarn and the staple fiber strand. The fiber twist angle of the strand in a hybrid yarn is smaller than that of a rotor spun single yarn with the same spinning conditions. Although a fed filament yarn has a false twist inserted by increasing the filament over-feed, the filament yarn in the hybrid yarn has a smaller level of fiber twist angle in the same direction as the twist of the staple fiber strand due to untwisting of the false twist.