Weaving Fabrics From Rotor Spun Yarns

By: K. Nick

  • The tests confirmed the higher tensile strength of ringspun yarns compared with rotor spun yarns.
  • With the same twist ringspun yarns had up to 36% higher tensile strength.
  •  With a rotor spun yarn having 20% higher twist the difference was still up to 28%.
  •  In the meantime, however, it has been possible to narrow the differences considerably by means of improvement to the rotor spinning machine.
  •  Rotor yarns are more uniform than ringspun yarns, have greater elongation at break & take-up about 3% more size. The rotor yarns woven on sulzer machines are just as unattended by problems as ringspun yarns.
  •  With rotor yarns the end breakage rate during weaving is somewhat higher than for ringspun yarns in some cases , though it is still quite admissible .
  •  Further advances may be expected with the rotor spinning technology, bringing a further advances may be expected with the rotor spinning technology, bringing a further reduction in yarn faults & hence in the frequency of stoppages.
  • We have established that the cylindrical package with 128mm. Traverse makes a good weft supply.
  •  Attention must be paid to the reverse winding on the supply packages , otherwise rewinding will be necessary.
  •  As a result of our investigations it can be stated that rotor yarns between 1/4 scc & 1/24scc  can now be woven without difficulty on the sulzer machine. Yarns upto 1/36scc were woven in our tests.
  • The fabrics woven from the rotor yarns are distinguished by their more regular appearance & better coverage compared with ring yarn fabrics.
  • In addition to increasing the tensile strength in the weft , the ml treatment results in a gain in width of 5-15%, cloths woven from rotor yarns about 1.2% wider than those from ring yarns  in tests.
  • The loss of strength sustained in finishing can be compensated by the ml treatment.
  •  Rotor yarn fabrics take up about 10% more finishing liquor, print pattern outlines are sharper & the colours are somewhat fuller.


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