Rieter

Deterioration in evenness during processing

Index

In processing in the spinning mill, the unevenness of the product increases from stage to stage after the drawframe. There are two reasons for this:

  • The number of fibers in the section steadily decreases. Uniform arrangement of the fibers becomes more difficult, the smaller their number.
  • Each drafting operation increases the unevenness.

The contribution made by any one machine to the overall deterioration in evenness can be calculated. If, for example, a ring-spun yarn produced from a roving with a CV value of 4% has an unevenness of CV = 13.6%, then the contribution of the ring spinning machine is:

{CV}^2_{actual} = {CV}^2_{feed} +{CV}^2_{additional}

for our example:

CV_{additional} = \sqrt{{13,6}^2 -{4}^2} = 13 \%