42—IRREGULARITIES IN COTTON AND RAYON-STAPLE SLIVERS CAUSED BY ROLLER SLIP AT THE DRAWFRAME

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Abstract
Three types of irregularity caused by slipping at the middle rollers of a cotton drawframe have been observed : (1) A fairly high amplitude drafting wave 3 to 4 inches long, which occurs when the grip of the second rollers is so low that the second top roller and the cotton under it run at the speed of the third roller; (2) A very high amplitude wave about 15 inches long, which occurs at moderate roller grip, when the second top roller runs alternately at the speed of its own bottom roller and at the speed of the third roller; and (3) A wave of similar amplitude and wave-length caused by the slivers being pulled forward over the third bottom roller when the grip of the third rollers is very low. The paper describes the conditions under which these irregularities occur, and discusses the theory of their formation.

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