The Study On Spinning Blended Rotor Spun Yarn Of Silk And Cashmere

This work research used the blended raw materials of silk and cashmere to spin 36.4tex spun silk/cashmere 85/15 rotor spun yarn.It is one of the examples spinning non-cotton rotor spun yarns.The sliver was made by short-fiber length 15-20mm,which could not be used by using common practice of spinning.Yarn made from Spun Silk/cashmere blends are suited for a variety of woven and knitted textiles products.The production of yarn on the rotor spinning machine is affected by many factors;related to the raw material,machine setting and processing parameters.Some are critical like raw material and its preparations,navel,rotor parameters and speed,opening roller parameters and speed,twist index and others.Navel as the key element for guiding the yarn and inserting false twist merit the level of attention devoted to them.An increase in performance is limited by the mechanical and thermal stress that the fiber raw material can withstand,as well as the fiber characteristics.The opening roller,which is one of the three most important items in the OE Rotor Spinning system, influences yarn quality and spinning performance.In addition to the raw materials,roller speed and type are critical.Rotor speed has a significant influence on wrapper fiber formation and yarn characteristics. In general,increasing rotor speed deteriorates yarn quality when all else held constant.However, high rotor speed can be run with the appropriate rotor,transport channel design,and raw material selections.An increase in opening roller speed generally causes more dust formation,more fiber damage,reduced yarn strength and less yarn elongation upon breakage.On the other hand,high speed also causes better sliver opening,better trash extraction,improved Uster yarn CV values and fewer imperfections. Twist multiplier increases the strength of the yarns by creating lateral forces which prevents the fibers in the yarn from slipping over one another.These forces bring the fibers closer this makes the yarn more compact.High twist level increases the insertion time.This is because twist reduces the diameter of the yarn and makes the yarn surface smoother.The propulsive force decreases with a decrease in the diameter.Also,smoother surface reduces the friction between the yarn surface and the air.As a result,basically yarns with low twist have longer velocities and high weft drag.According to the test result of yarn quality parameters and performance during this process, optimum selection of types and specification of opening roller and navel was made by using the analysis method of combining fuzzy decision-making and fuzzy pattern classification.Then,we predicted the quality parameters of 36.4tex spun silk/cashmere 85/15 rotor spun yarn by using neuro-fuzzy system.Finally,in order to obtain the optimum values in rotor speed,opening roller speed,and twist factor,the universal rotated experimental designs was done.With the experiment and analysis of different methods,the following results were obtained;1.To spin 36.4 Tex spun silk/cashmere 85/15 rotor spun yarn;2.The best combination of technological components was pin roller type of opening roller combined with the spiral grooved ceramic navel;3.From the speeds of rotor and opening roller,neuro-fuzzy system was able to predict the quality properties of 36.4tex spun silk/cashmere 85/15 rotor spun yarn.A combination of low or high rotor speed and high opening roller speed can be used to produce the best values of this yarn.4.Rotor speed has the largest effect to reduce the yarn hairiness value and to increase the CV of yarn count value,yarn neps,thin places,thick place and CV of yarn elongation.Opening roller speed has the largest effect to increase the CV of yarn tenacity and to reduce the yarn elongation.The Twist Multiplier(TM)has the strongest effect on the yarn tenacity. 5.Low value of rotor speed and high value of opening roller speed and TM can be used to produce the optimum values of this yarn. The optimum condition for rotor speed,opening roller speed and twist factor were 36246rpm, 7336rpm,and 473 respectively.The yarn produced by using the optimum parameters has a good quality.