The Influence of Front-Roll Coverings on the Spinning Strength of Cotton

Abstract

An apparatus for measuring the force required to pull an end down during spinning was developed. The apparatus, a single-spindle duplication of the Tru-Set (Saco-Lowell Duo-Roth) spinning frame, was modifed to provide for pneumatic loading of the front drafting rolls. Four hundred end breaks on a single cotton were recorded for each spinning strength test point. Six front-roll coverings having different hardness and composition were tested for spinning strength at roll loading from 89 to 178 N (20-40 1b). Surface frictional properties against cotton roving were measured. Variables such as roll diameter buffing amount, running hours, and roller age were considered. Test results show that surface friction coemcient dominates spinning strength performance, and the spitming strength provided by one roll actually decreased with increasing roll load.

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