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Wrapping Fibres

  • The rotor , & hence the fibre ring , revolve continuously under the stationary feed tube - as also does the spun yarn in the binding-in zone.
  • A stream of individual fibres flows from the feed tube & is deposited in the groove.
  • Normally , incoming fibres that have not yet been twisted in, but, in the binding -in zone , they strike an already-twisted yarn section rotating around its own axis.
  •  Fibres arriving here can not be bound into the strand:
  • They wrap themselves around the yarn core in the form of of a band , called wrapping fibres.
  • This is a typical characteristic , & simultaneously an identification feature, of rotor spun yarns.
  • The number of wrapping fibres is dependent , among other things, upon :-
    • The position at which the fibres land on the rotor wall.
    • The length of binding-in zone.
    • The ratio of the fibre length to the rotor circumference.
    • The false twist  level.
    • The rotor rpm . &
    •  Fibre fineness.

 



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