This is an account of work primarily intended to find the effect of speed of drafting, associated with spindle speed, on yarn breaking strength. To this end, yarns were spun from a series of rovings widely different in size, with a series of twist multipliers, and a range of spindle speeds.
The results showed that, for the 6000 to 12,000 rpm range there was an increase in strength with increasing spindle speed. At speeds below this range a minimum in strength was found between 4000 and 5000 rpm. Other findings: strength decreased with increase in roving twist above normal values, and thinner rovings gave stronger yarns under the particular conditions of these experiments.
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