The improvement in uniformity and decrease in imperfections obtained with decreased twist might be due to the measuring principle of the Uster Evenness Tester rather than to any spinning phenomena.
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References
1.
Audivert, R. and Fortuny, E., Some Observations on the Irregularity of Roving as Measured on the Uster Evenness Tester, J. Textik Inst.63, 618-619 (1972).
2.
Ratnam, T.V. , Shankaranarayana , K.S., Underwood, C., and Govindarajulu, K., Prediction of the Quality of Blend Yarns from That of the Individual Components, Textile Res. J.38, 360-365 (1968).