The Breakage of Staple Yarns

Abstract

The mechanism of breakage of PET (polyethylene terephthalate/cotton staple yarns has been investigated by study ing the fibers removed from actual yarn breaks. Techniques have been devised that show the strain history of the PET fibers at a break and live the f: action of broken PET and cotton fibers. It is postulated that yarn breakage takes place in two stages: an initial rupture, followed by breakage of PET fibers spanning the "gap" formed. Such a mechanism may be common to all staple yarns, whether homo-yarns or blends, since 100% PET staple yarns appear to behave similarly. These techniques were used to examine yarns broken during mill spinning, It appears that the mill breaks occurred by fiber slippage hefore the yarn was fully developed, probably at the drafting stage. This view is supported by comparison of the break frequency/load spectrum of the spun yarn with the spinning conditions.

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