DRAFTING FORCE OF FINE DENIER POLYESTER FIBERS

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 draftin g ratio, roller gauge, twist multiplier, and fiber mass) and drafting force follow the same trend as for cotton fibers. However, the draftin g force curves reveal some differences between them. The character of the former reveals that it has a high drafting force value and a broad er 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 yam than the mean drafting force. In actual spinning, better quality yarn is obtained with a suitably l ower draft.