Research on the application of friction false-twister in staple core-spun yarn spinning

A method for producing staple core-spun yarns (SCYs) by replacing the traditional front roller with coaxial rollers with different diameters was proposed in previous research. In this study, a friction false-twister was introduced in the staple core-spinning system to improve the covering effect and spinning efficiency. Firstly, a spinning principle to produce a modified SCY (MSCY) was introduced. Subsequently, the effects of yarn twist and false-twister speed on the shape and stability of the spinning triangle were investigated. Then, the impacts of yarn twist and false-twister speed on the performance of the MSCY were focused on. Meanwhile, the optimal false-twister speed was selected based on the overall performance of the MSCY. Finally, the performances of the MSCY with optimal false-twister speed and the SCY without using a false-twister were compared. The significance of these differences was analyzed using one-way analysis of variance. Results show that the core exposure proportion of MSCY increased with the increase in false-twister speed. As the false-twister speed increased, the breaking force, breaking elongation, and sheath-slipping resistance of MSCY initially increased and then decreased, while the yarn evenness and hairiness initially decreased and then increased. Based on a comprehensive analysis of the MSCY performance, the optimal false-twister speed was determined to be 160 r/min. Furthermore, compared with the SCY, the MSCY exhibited an increase in hairiness but significant improvements in covering effect, breaking force, breaking elongation, sheath-slipping resistance, and abrasion resistance. This study provides valuable insights and practical guidelines for producing high-performance SCYs.