Effect of servo building motion and compact spinning on classimat faults in sustainable cotton/excel blended yarns

The LF14000 A speed frame, launched in the 1980s by the LMW (Lakshmi Machine Works Limited) company, is currently contending with newer speed frames that feature advanced processors and software for managing spindle speed and the bobbin building process. The LF1400 A has been redesigned, eliminating the mechanical building motion with a servo-controlled building motion. The main motor, which is inverter controlled, has contributed to a decrease in the breakage rate of the speed frame. A servo motor regulates the bobbin speed, controlling the roving stretch. The yarn samples created for this research include counts of Ne 30 s, Ne 40 s, Ne 50 s, and Ne 60 s. Each count is produced using various blends of 100:0, 90:10, 75:25, 50:50, 25:75, 0:100% cotton/excel. All yarn samples are manufactured using both a normal ring frame and a compact ring frame. A comparison of classimat faults across these samples revealed that compact yarns have fewer classimat faults than noncompact yarns. Additionally, it was observed that 100% cotton yarns have a higher frequency of classimat faults compared to those made from cotton and excel blends. Furthermore, 100% excel yarns showed a lower incidence of faults across all counts compared to 100% cotton and cotton/excel blended yarns. The classimat faults demonstrated a decreasing trend as the percentage of excel fibre increased, from 100:0% cotton/ excel yarns to 0:100% cotton/excel yarns. Finer yarn counts displayed a higher incidence of classimat faults than coarser counts. The improvement of total classimat faults 30 s combed compact 10.1%-26.5, 40 s combed compact 10.8%-26%, 50 s combed compact 11.2%-33.6% and 60 s combed compact 10.2%-22.93% is observed across all blends. Further it is also noted that 0%/100% Cotton/Excel blend improvement in 30 s, 40 s, 50 s and 60 s combed compact is (around 10%-10.8%) not statistically significant.