Abstract
An investigation was made on the hairiness and diameter of ring and open-end (OE) yarns processed through single- and double-cylinder carding machines. Yarn hairiness was measured with a photoelectric tester designed by the East China College of Textile Technology. When the length and the number of frequency distributions of hairs of both yarns were measured, three conclusions were reached: 1) the total and average length of hairs and the percentage of extremely short and long hairs of OE yarns are both greater than those of ring yarns; 2) Hairiness of OE yarns processed through single- or double-cylinder carding machines is of nearly the same value in both total and average length but differs significantly in coefficient of variation; 3) the between-bobbin coefficient of variation of the hairiness of OE yarn is greater than that of ring yarn, but there is no great difference in the within-bobbin coefficients of variation of the hairiness of these two yarns.
The diameter of OE yarn processed through the double-cylinder carding machine is about 2% smaller than that of yarn processed with the single-cylinder carding machine, which is not very significant. OE yarn has a lower coefficient of variation in diameter than ring yarn. The within-bobbin coefficient of variation in diameter of either OE yarn or ring yarn is higher than its between-bobbin coefficient of variation.
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