Advantages Of Spinning And Winding

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Rotor or Open-end Spinning Open-end or Rotor is one of the most modern techniques of spinning and winding. Here spinning and winding are sensibly combined in one process. This process overcomes all the problems of Ring Spinning by separating twisting and winding in yarn manufacturing process. It has established itself alongside of Ring frame. On one hand, the success of rotor spinning is due to substantial increase in productivity and on other hand to the possibility of full automation of the spinning process. This is possible because it combines three manufacturing processes – Speed frame, Ring frame and Winding – into one single step. It was not only the economic advantages; but constant improvement in your parameter. Fig: Steps in Process…show more content…
In some respects open-end yarns are indisputably better; in others they are inferior or at least may appear to be so when judged by the criteria normally applied to the ring spun yarns. Yarn Properties The tenacity of this spun yarn is 15-20% lower than that of equivalent ring spun carded cotton yarns and up to 40% lower than that of ring spun combed cotton or man-made fibre yarns. Factors affecting the degree of difference include linear density, material, preparatory process and type of machine. Even though the strength is low as compared to ring spun yarn the strength regularity is better in OE yarn which gives it an advantage in subsequent process. - Twist – OE spinning frames are built for ‘Z’ twist only. The level twist used in production of OE yarns is usually higher than ring and are necessary to give satisfactory performance. - Extension – OE yarns are more extensible and recover very quickly from short term stressing. The higher extensibility of OE yarn obviates or out-sets the disadvantages of lower strength. - Regularity – OE spun cotton yarns are superior in short term regularity to carded ring spun cotton yarns and there is complete absence of pronounced drafting weave type of irregularity that is the characteristic of the…show more content…
This is manifested in the yarn core where fibres do not adhere so firmly as in yarn spun on ring frames. Fabric Characteristics The major factors that determine the properties of fabrics are the yarn properties from which they are produced. It is therefore to be expected that fabrics produced from OE spun yarn will have lower tensile, tearing, and bursting strength and higher extension of breaks, than their equivalent. The actual differences however, are influenced by other factors like fabric construction etc. - Appearance – Yarn regularity, less fault content, absence of nep, hairiness and luster, all improve the appearance of fabric produced from OE spun yarn. The difference in appearance between fabric made from OE yarn and ring frame yarn is less when comparison is made with combed yarns in fabric or man-made fibre yarns. - Fabric Strength – The reduction of strength in OE yarns by 15-25% is reflected in fabric strength. This, however, can be adjusted by engineering the fabric, the weave, set and yarn count. - Fabric Shrinkage – With density set OE fabrics, shrinkage is approximately same as that of conventional fabrics. With loosely set woven fabrics, however, the shrinkage is about 0.5 - 1.0% higher in both warp and
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