Improvements in the cross‐sectional structure of composite yarn

This study investigated composite yarn on a 4‐roller drafting system with the goal of improving the cross‐sectional structure of polyester filament/rayon fiber (P/R) composite yarn. We found that a 4‐roller drafting system with 2 double aprons is beneficial for controlling the filament spread width, as well as improving the mixing efficiency of spreaded polyester filaments and drafted rayon fibers in the nip of the front roller. Consequently, this arrangement will yield a composite yarn with better blend uniformity. The results revealed that the fraction of the uniform distribution type and the wrapping type could increase up to 34.0% and 19.5% respectively.