Abstract
Measurements of count, twist, and diameter were made on 500 specimens from 20 spun nylon yarns, covering counts from 10s to 40s and twist factors from 2 to 8, and used to study the specific volumes of these yarns. It was shown that in hard-twisted yarns the packing was about 7% less effective than in an ideal ring structure. In soft-twisted yarns, the specific volume was much greater. The effect of tension on yarn diameter was investigated in preliminary tests. The correlation between twist t and count N was also considered, and the constants k and m in the relation t = kN m were calculated. The value of m was shown to vary with twist factor in a way which could be explained by the torque-twist relations of yarns.
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