Studies Of Fibre Belts In Rotor Spun Yarns

By: A.K. Sengupta, B.Dutta & P.Radhakrishnan

Influence of fibre parameters and twist density on belts :-.
1. When two fibres of dissimilar lengths are blended together, the longer fibre predominates as belts in the rotor yarn.

2. The frequency of belts increases with the increase in twist density. This is because of the extension of the tie in zone with the increase in. Twist. It is, however, observed that the ratio of the constituent fibres comprising the belts are not influenced by the change in Twist density.

3. Neither the fibre denier nor the fibre type appears to influence the composition of belts.

Influence of belts on strength of rotor spun yarns.  :-.
  •  It has been shown that when fibres of dissimilar lengths are blended together , the longer fibre predominates in belts.
  •  The belts in viscose cotton blended yarn are largely composed of viscose fibres.
  • The presence of long-length viscose fibres as belts restricts the slippage mode of failure in the yarn.
  •  In a yarn with low twist factor the proneness to slippage of fibres is likely to be greater , & this is where belts are likely to contribute most in the enhancement of strength by restricting this tendency.
  •  When the twist factor is increased, the twist in the core will also be enhanced, & the increase in interfibre frictional resistance brought about by the compression of belts is likely to lesser significance.
  •  An increase in the length of viscose fibre from 27 to 38mm. Increases the strength of the yarn due to an improvement in the length of belt.
  •  When the length is further increased, no further beneficial effect is noticeable.
  • With the increase in the length of viscose fibre, its proportion by number in the blend also decreases , & this may act counter to the beneficial effect obtained through an increase in the belt length.


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