Drilled Holes In Rotor

  • The idea of drilling holes in the rotor periphery to remove possible accumulations of deposits is not novel .
  • The holes are not intended to generate the air-flow needed for the transfer of the fibres from the opening roller to the collecting groove.
  •  Their size & positions are therefore different .
  •  Previous work with peripheral holes was mainly concerned with the spinning of wool fibres & involved large -diameter rotors.
  • Although the holes allowed a degree of trash ejection , their suction effect interfered with the fibre arrangement & twist propagation in the rotor groove & made spinning possible only at uneconomically high twist factors.
  •  When short fibres were tried , the high twist factors & the  high loss of fibres through the holes made the technique impracticable.
  • Recent patents show that the repositioning of the holes from the rotor groove to the outer radius of the rotor base is a more promising proposition  illustrates  a self-cleaning -rotor design utilising waste -removal holes .
  • The holes can vary in number {50 - 150} & size {0.5 - 3 mm} BUT MUST BE POSITIONED NO CLOSER THAN 4mm. From the rotor groove .
  •  It is interesting to note that the complexity of the rotor profiles  described earlier would not appear to be up to 1% , based on the weight of yarn spun .
  • The interference is that fibre loss would be significant even though the lint removed had a low mean fibre length & a high short - fibre content.
  •  Yarn quality & spinning performance were claimed to have improved when the waste holes were drilled into the rotor , & the yarns produced gave less lint-shedding during knitting.


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