A STUDY OF THROSTLE-SPUN-SILK RAW-SILK CORE-SPUN YARN .2. YARN APPEARANCE

Using different spinning systems, the experimental core-spun yarns are made from the same fiber material under the same yarn conditions, nam ely, yarn count, twist factor, and fiber composition. The shape factor is adopted to evaluate the core eccentricity as the position of the c ontinuous-filament core yarn in the cross section of the core-spun yar n. The bispectrum is applied to consider the yarn irregularity in spec tral analysis. The characteristic appearance of the throstle-spun yarn is discussed and compared with that of the ring-spun yarn.