5—THE SELF-TWIST SPINNING OF YARNS OF HIGH LINEAR DENSITY FROM COARSE WOOLS PART III: SOME TECHNOLOGICAL IMPLICATIONS

The variation of the efficiency of twisting with yarn linear density and fibre fineness in self-twist spinning is interpreted in terms of the mean fibre diameter and the number of fibres in the strand cross-section. This interpretation of the experimental results and the conclusions reached have some interesting implications in relation to the design of self-twist-spinning machines and the wider application of the self-twist principle. Perhaps the most significant finding is that the efficiency of twisting of the Mark I Repco Spinner is generally low, particularly when yarns of high linear density are spun from coarse fibres. It is implied that the efficiency of twisting may be increased if a harder rubber covering is used on the twisting rollers.