A Study on the Mechanical Properties and Fiber Damage in Combed and Carded Rotor Cotton Yarns

Abstract

Rotor spinning is considered as the most common spinning system among the various new systems. This system has some research potential for yarn quality enhancement and combing process is recently introduced as one of the areas. In this research, carded and combed rotor yarns (30 Ne) were produced and the effect of combing process on some physical and mechanical properties was studied and compared with that for carded yarns. The results show that combing process improves the yarn evenness and yarn strength and reduce the hairiness of yarns. Statistical test (t-student) in 95% confidence interval confirms the statistical difference between the tenacity of combed and carded rotor yarns. Fiber damage was studied in terms of length distribution curves and SEM observations. The results show that fiber damage is more pronounced for the combed yarns. That is while mean length and effective length remained superior and short fiber content remained lower than that in carded yarns. Also, time study revealed that the end breakage in producing of combed yarns was less than carded yarns; i.e. better spinning stability. The likely mechanism of fiber damage during the conversion of fibers to yarn is discussed for both yarns.