Tangling angles are the angles between filaments in the tangling parts of interlaced yarns and yarn axes.They are one of the constructive factors which determine the characteristics of interlaced yarns. Filaments in the tangling parts, however, display such complex configurations that the measurement of tangling angles by using traditional methods requires considerable time and labor. The present paper proposes a new simple method to determine tangling angles and clarifies the relation between tangling angles and interlacing condi tions. Results obtained are as follows :
(1) A model of interlaced yarns was made in order to determine the tangling angles.-These tangling angles were calculated by measuring apparent easily-quantifiable characteristics of interlaced yarns including : the lengths of tangling and non-tangling parts, the apparent diameters of non-tangling parts and so on. These calculations were in excellent agreement with values measured with a microscope. Except for large feed ratios, they also agreed well with the measured values even though the apparent diameters of non-tangling-parts were not taken into account.
(2) It took about 50 hours to obtain the measured tangling angle. On the other hand, the times required to obtain the calculated and simplified tangling angles by the present method were 1/7 and 1/14 times shorter than that to measure the tangling angle, respectively.
(3) The present method makes possible “on-line” measurement of the tangling angle because the apparent characteristics used to calculate the tangling angle can be obtained by “on-line” measurement.
(4) When supplied air pressures and feed ratios are large and yarn speeds are small, tangling angles take high values. The feed ratio has especially a great effect on the tangling angle.
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