Raw silk of different sizes (10, 27, 42, and 100d) was used to produce 200d of twisted yarn with twist numbers of 100, 200, 500, and 1,000T/m, and the untwist percentage, bending rigidity, and hysteresis of non-degummed and degummed yarn were examined. The results show that the physical properties of the produced silk yarn are highly dependent on the twist number and that the structure of twisted yarn is highly dependent on the raw silk size. Furthermore, yarn produced from thick raw silk has superior bending characteristics.
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