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Back-Take Off

 

  • The idea of “back -take off”  is  based on the idea that , when twist is being inserted into the collected fibres , the twisting action can be used to make the fibres brush the technique therefore assumes that the large trash particles are removed prior to fibre collection in the rotor groove.
  • The basis of this technique is the direction of rotation  of the yarn in the peripheral - twist zone .
  • Inward rotation , i.e. , Towards the maximum radius of rotor , pushes particles into the bottom of the groove & thus  increases the rate of build-up of the dust deposits .
  •  Outward rotation tends to eject particles into the rotor base & keep a cleaner groove.
  • The direction of rotation will depend on the method used to remove the formed yarn from the rotor , i.e. ,” Front take-off” - where the yarn passes through the centre of a doffing tube or “ back-take off” -where the yarn passes  through the centre of the rotor base.
  •  Observation has shown that the effect  is  independent of clockwise or anti-clockwise  rotation of the rotor itself or of whether s or z twist is inserted into the yarn .
  •  Other reports imply that “back take off” can present costly engineering -design & construction problems.


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