Formation Of Coherent Fibre Strand

  • At the start of the development of the rotor spinning, the fibres were mistakenly guided directly into the fibre-collection groove.
  •  The disadvantage was that , during the acceleration that had to be carried out, the fibres inevitably collided with the radial yarn end .
  • This  led to a deterioration in the fibre orientation.
  • In currently available rotor spinning m/cs , the fibres flowing into the rotor strike directly against the rotor wall above the groove.
  • The yarn so produced had the typical “sauerkrut” structure, with very low strength.
  • Higher rotor peripheral speed than colliding fibres gives the drafting effect which ensures  straightening & lining-up of fibre.
  •  Since at this juncture drafting is essential , it imposes  lower & upper limits to the rotor speed.

  • The air flows are very important in this region .
  • There should not be any air turbulence between the feed tube & the rotor wall.
  • The aim  is to generate a uniform , rotating air stream that assists in forwarding the fibres onto the rotor wall in straight condition.
  • This depends , among other things , on the distance of the feed tube from the wall & the formation of the rotor cover that contains the feed tube.
  •  Accordingly, several manufacturers use replaceable covers matched to the diameter of the rotor, which is also replaceable.
  • An incoming fibre strikes an inclined wall & is pressed outwards by an enormous centrifugal force -over 100000 times the weight of the fibre.
  •  This causes the fibre to slide downwards on the rotor wall while being accelerated in the peripheral direction & to be deposited on the other fibres in the collection groove.


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