The non-linear dynamics of over-end unwinding yarn package: theory and experiment

Over-end unwinding has been proved to be the most optimal process to transfer yarn from one package to another in order to improve the quality and the characteristics of subsequent processes like warping and weaving. The highly nonlinear behaviour of this unwinding process results in the variation in quality of the final product and if this behaviour is not controlled, the variation becomes more pronounced. This non-linear behavior should be well understood to select the optimum process parameters for a given operation and subsequent processing. This study was done to analyze the effects of various process parameters on the tension distribution and balloon profile and to experimentally validate the mathematical model set forth for predicting the behaviour of over-end unwinding. The variables used for the study purpose are Unwinding Speed, Mass Linear Densities, Package Diameters, and Guide-eye Distances.

Keywords: Over-end unwinding, ring spinning balloon theory, rotating yarn loops, yarn balloons

doi :10.4038/jnsfsr.v35i4.1309

J.Nat. Sci.Foundation Sri Lanka 2007 35(4) 225-233