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Abstract:
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Because yarn manufacturers are continually concerned about quality and because they may not be aware of all the effects of changes in spinning conditions on yarn quality this work was designed to correlate changes in yarn quality with changes in fabric appearance and performance properties. Yarns were spun using both a 46 mm and a 40 mm rotor at two different speeds. Two navel types, smooth and grooved ceramic, were also incorporated into the spinning conditions.
This research determined that significant differences exist in the physical properties of yarns spun under
various spinning conditions. Losses in quality were experienced when rotor diameter was decreased, when rotor
speed was increased or when a grooved navel was used instead of a smooth one. The changes affected the two yarn
types, 100 percent cotton and 50/50 polyester/cotton, differently however.
The yarns were used to knit fabric panels consisting of one spinning condition and evaluated for changes in the properties of the fabrics. Significant changes were observed in the pilling, cover and unitormity properties of the fabrics. The yarns were also used to knit fabrics
containing mixtures of yarn spinning conditions. Almost all fabrics contained barre or other aesthetically
displeasing conditions in greige fabric form, and may carry over into the dyed and calendered goods. In some cases barre was not readily discernible in some lighting
conditions, which could present problems in quality control of finished goods.
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