A certain level of hairiness in yarn is generally acknowledged as unavoidable because of the practical limitations of mechanical processing machines. Spinners are therefore interested to know the effect of fiber properties on yarn hairiness when selecting suitable raw materials. The literature on parameters such as fiber fineness and short fibre percent reports contradictory trends, while the influence on hairiness of other param eters such as uniformity ratio and fiber quality index is not considered. In this paper, we have investigated the influence of fiber characteristics on the hairiness of cotton yarns.
Using a rapid yarn hairiness tester, the Shirley yarn hairiness meter, this work has confirmed that for cotton yarns, the statistical distribution of the number of protruding ends of different lengths is exponential. The study indicates that, compared to the other hair length settings available on the hairiness meter, the recommended 3 mm hair length is suitable and advantageous. Further there is a high correlation between the Shirley hairiness meter and two other hairiness indices, the modified Jedryka and the Digital fibrograph, considered in this work.
A method has been suggested to utilize the Digital Fibrograph to derive an optical fineness coefficient, which would correlate very well with gravimetric fiber-fineness measurements. Regression equations have been worked out to predict equivalent values of linear density from measurement of the optical fineness coellicient. A comparative study has also been made of the extent of association of the respective Micronaire values as well as values of the optical fineness co efficient with actual gravimetric fineness measurements.
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