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Effect Of Trash On Rotor Spinning

  • In ring spinning , the trash particles are ejected harmlessly from the spinning balloon , but in rotor spinning these particles accumulate in the yarn -forming groove of the rotor in the following way :-.
    • Firstly the ring tapers from a maximum cross -section at the peeling point to virtically zero behind it.
    • Secondly , the surface of the slide wall is continually exposed to a varying degree as the yarn arm revolves  relative to the rotor. & This permits the deposition of particles on the slide wall. Rotation of yarn arm in the peripheral - twist zone works such deposits down the slide wall & into the the bottom of the rotor groove.
  • These trash particles displace the fibres to wider part of groove [as shown in figure] so that the process of yarn formation becomes  less precisely controlled.
  • Yarn strength declines ; yarn uniformity deteriorates ; yarn hairyness  & appearance are preceptibly altered .
  • Ultimately ,the trash builds up to a point at which the process of yarn formation is interuped , & an end break occurs.
  •  Time taken to end break from start is called maximum spinning time.
  • It also results in less twist at trashy zone which increases false twist effect.
  • Analysis of end breaks in rotor spinning:
    • End breaks due to formation of tufts  due to trash  particles =31.5%.
    • Dirt accumulating at the trash -removal slot & then  being drawn into the rotor =28.5%.
    • Impurities  in the drawframe sliver, which should have been removed during opening & carding = 24% 
    • Deposit of dust in the rotor = 16%.
    • Clean raw material is therefore a precondition for spinning of yarn on the rotor spinning machine.
  •  In accordance with recommendations from rieter ingolstadt , the following residual trash content should not be exceeded in the feed sliver;
    •  1]up to 10 nm{ 6ne} :0.3 %.
    •  2] up to 34 nm {20 ne} : 0.2 %.
    •  3] up to 50 nm {30ne} : 0.15%.
    •  4}above 50nm {30ne} : 0.1%.
  • There are two approaches to tackle trash problem :
    • 1] improved sliver preparation  &.
    • 2] improved cleaning at  rotor  spinning unit.
  • We will discuss both of these approaches.

 



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