Abstract
In order to evaluate interlaced yarns on an on-line real time system, diameters of interlaced raw yarns were measured by means of an optical sensor, and effects of feed ratio, supplied air pressure and yarn speed on various evaluation quantities were quantitatively clarified. Results obtained are as follows. The number of tangles measured with the sensor agrees excellently with that by eye when yarns are well interlaced. The relation between the distance between tangling parts and its relative frequency is discussed, and the frequency obtained with the sensor almost agrees with that by eye. Yams with a large number of tangles have not only a small standard deviation of the distance between tangling parts but also a large interlacing effect index, which represents both the number of tangles and the distinction between opening and tangling parts. Therefore, it can be said that interlaced yarns are qualitatively evaluated from only the number of tangles.
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