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Comparative Analysis of the Properties of Yarn Spun by Rotary Threaded Surfaces with Different Pitches

ABSTRACT In this study, theoretical analysis was conducted for fiber control by contacting rotary-threaded surface during conventional spinning. The phenomenon of pre-twisted fiber sub-assemblies produced by thread micro units was discovered to adjust yarn formation zone, and the key mechanisms on remodeling the shape of twisting triangle with different-threaded axial forces was theoretically discussed. Then, the properties of three various yarns spun by rotary-threaded surface with different pitches were compared to that of original yarn. Yarn hairiness results revealed that harmful hair decreased as the threaded pitches shortened, trapping losing fiber and enhancing edge fiber control by rotary-threaded surface. The losing fiber trapping and edge fiber assembling caused reduction of thin places, while the blocking twist transmission possibly increased the thick places and neps. Yarn tensile results showed significantly improvement after applying the rotary-threaded surface with shorter pitches, and the stronger agglomeration force provided higher fiber utilization for closer yarn structure. The experimental results corresponded well with the theoretical analysis.