Drafting Dynamics of Fine Denier Polyester Fibers

Abstract

It is important to understand the role of fiber properties in the drafting process. Finer denier fibers may have different drafting behaviors than average denier fibers, such as drafting force, required roller settings, draft distribution, and velocity change zone. The objective of this work is to study the interaction of specific fiber fineness values and the drawing machine. Three different fine denier polyester fibers (0.8, 1.0, and 1.2) are run on a three-over-three roller drafting machine set at six different drafts with three roller settings. A high-speed video camera system observes fiber movements and measures fiber speeds in the drafting zone. In this study, fiber speed and variations in fiber speed are significantly affected by fiber fineness and drafting conditions. Fineness changes drafting behavior by introducing fiber clusters and fiber contact points. The acceleration process depends on the interaction of static and dynamic friction forces at the fiber contact points. Therefore, fiber movement in the drafting zone is not a continuous process, that is, it consists of local acceleration and slowing down of segments of fibers.

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