Abstract
An assessment is made of irregularities added in apron drafting through comparisons of variance-length curves of fiber end density before and after drafting. In addition, the drafted products were examined for periodicities through correlograms. The investigations were made on a carded and a combed cotton and a cut staple fiber for a range of drafts. The studies were later extended to obtain relations of thickness irregularity with draft and hank of material fed. The implications of these results are discussed. Further, the effect of apron opening and doubling on yarn quality and a critical comparison of roller and apron drafting in regard to extent of irregularities added are presented.
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