Mebrahtom Teklehaimanot Tesfa*, Kiday Fisseha, Tsfay Embaye and Million Ayele
This research is expected to address mainly for the existing problem of the spinning process in yarn strength, yarn evenness and yarn total imperfections. This was done by identifying the ring frame machine components that affect quality and proposing an engineered process an optimum value of ring machine components of the spinning department in Almeda textile factory. In this research, samples were prepared at the existing production lines at different values of process factors and ensuing interactions based on 2 level factorial experimental designs. Design expert, fitting software for DOE based experiments, was employed to analyze the results. The factors studied are the fiber parameters used for production (fiber length, fineness, trash content, honeydew) and the impact of traveller weight, ring top roller shore hardness and spacer size, on yarn total imperfections, U% and yarn strength are the intended responses to be evaluated. The top roller hardness, spacer size and traveler weight have an impact on the ring spun yarn. Finally the optimum machine components value of the process factors are chosen by the software to have top roller shore hardness (65), traveler weight (35) and spacer size of (3 mm) for 65/35 P/C 36 Ne yarn were selected. These setups of machine components produce a yarn having yarn unevenness (12.9%), yarn total imperfections (326) and yarn strength (19.7 cN/Tex).
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