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Comparison of Properties of Cotton Yarn Produced by the Dref-3 , Ring and Open End Spinning Methods.
 

By :-  Louis , Salaun

  • Reducing the air pressure on the dref machine below 69.9cm of water causes yarn quality to deteriorate.
  • The lower the pressure, the lower the yarn quality.
  •  The possibility that negative pressure greater than 69.9cm may lead to better yarn properties than now produced shall be investigated in future work.
  • For any given cotton, ring spinning produces the strongest yarns with the highest elongation at break, followed by the open end, & then the dref systems.
  • The open end system produces the most uniform yarn, followed by dref & then the ring systems.
  • The dref yarns have the best appearance grades, followed by the ring & open end yarns, although the dref yarns are being very hairy.
  • About 94% of the ring yarn skein strength can be accounted for by fibre length, strength, elongation, & micronaire reading.
  • These fibre properties can account for 92% & 74% of the open end & dref yarn skein strengths, respectively.
  • Cotton yarn sizes beyond 54 tex are difficult to produce on the dref system at 200m/min.
  • Based on the six cottons used in this investigation, we conclude that a cotton can be spun into strong ring yarn can also spun into strong open end & dref yarns, though at different strength levels.
  • Conversely a cotton that results in a weak ring yarn will also produce weak open end & dref yarns.
  • It is easier to produce a dref yarn consisting of 70% core & 30% wrap than 50% core & 50% wrap for any given set of cotton fibre properties, although the latter is usually stronger than the former.
  • This phenomenon warrants further investigation. The fact that the dref machine can produce acceptable yarns many times faster than the ring frame justifies further exploration to render it suitable for spinning finer cotton yarns. 

 



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