Abstract
The effects of fiber luster, guide material, surface charge, and critical surface tension of fibers on friction are presented. In the boundary region friction increased with increasing fiber luster, whereas in the hydrodynamic region the reverse effect was observed. The latter effect is minimized when using guides with rough surfaces. It is concluded that boundary friction of clean fibers against other clean solid surfaces is independent of the guide material when using guides of equal diameter and surface roughness, provided their shear strength is equal to or greater than that of the fiber. Friction and charge generated on guides by passing lubricated yarns are closely related parameters. Dynamic wetting data of fibers conform with the principle of critical surface tension. The absence of intrinsic adhesion by fibers with low energy surfaces has been confirmed by their low, friction, absence of stick-slip, and independence of friction from guide surface roughness. The effect of pre-tension on the magnitude and migration of stick-slip is described.
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