Abstract
The purpose of this article is to discuss why the draft of cotton spinning machines is affected by variations in temperature and relative humidity, and to fix a reasonable roll distance of the drafting element which will eliminate irregularity of draft. Our inquiry has shown a correlation between the tensile strength of the fiber bundle and the unevenness of the weight of delivered sliver and roving due to variations in temperature and relative humidity. Tests of the tensile strength of sliver and roving, and measurements of the draft effeciency, have revealed that the effect of variations in temperature and relative humidity can be reduced by fixing a proper roll distance in the break draft zone and a proper degree of roller-gripping force. Application of these results to spinning machines has reduced unevenness of yarn.
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