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Performance of OE System: Spinning Manmade Fibres and Their Blends :Effect of Rotor Speed &  Its Configuration. 

By: S. Kartikeyan , P. Chellamani

  • The OE yarns from man made fibres are weaker than their ring counterparts by 30-35% in 15ne count & 12-18% in 20ne count. The OE yarns are more even by 0.5-1.5 u% with fewer imperfections (6% to 26%).Count variation is also lower for OE yarns from manmade fibres by 0.3 to 1%.
  • The tenacity of OE yarns improve as the count becomes finer (from 15ne to 20ne) for 100% polyester, polyester/viscose & polyester/cotton. The yarn imperfections are found to increase by about 10% for unit increase in yarn linear density.
  • Fabric tensile & tear strength are reduced with rotor yarns but the extent of reduction at fabric stage is lower than that at yarn stage. Warpway tear & tensile strength for fabrics are consistently higher than weftway strength.
  • Air permeability is poorer & crease recovery is better for fabrics from rotor spun yarns.
  • In the case of waste mixing, yarns spun from Dutch rotors have about the same strength & are more even by 5-7 u% with 90% fewer imperfections as compared to ring spun yarns.
  • While spinning 100% polyester & viscose staple fibre yarns , tenacity systematically decreases as the rotor speed is increased, the percent drop being 14% & 7%, respectively for an increase in rotor speed from 36000 to 60000 rpm. The yarn tenacity of the blended yarn remains more or less constant at different rotor speeds.
  • The various yarn imperfections from all type of fibres/mixings show a steady increase at higher rotor speeds.
  • Higher rotor speeds generally bring down the yarn elongation significantly.

 



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