Abstract
In this paper, we use fine denier polyester fibers (0.8 denier) as the test material to measure drafting force in the break draft zone. The fundamental relationships between drafting conditions (such as drafting ratio, roller gauge, twist multiplier, and fiber mass) and drafting force follow the same trend as for cotton fibers. However, the drafting force curves reveal some differences between them. The character of the former reveals that it has a high drafting force value and a broader peak range. The force variation in the lower drafting ratio before the peak is low and steady, a very important parameter that is better correlated to the properties of spun yarn than the mean drafting force. In actual spinning, better quality yam is obtained with a suitably lower draft.
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