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Elastic interlocking of nylon fibers suspended in liquid

The elastic interlocking among fibers was examined in an experimental study in which relatively straight, smooth nylon (6-6) fibers of aspect ratios (fiber length-to-diameter ratio) from 65 to 189 were suspended in aqueous-sugar solutions. The fibers were in most cases neutrally buoyant. The suspensions were caused to flow in a partly filled, inclined-to-the-horizontal cylinder rotated about its principal axis to produce a recirculating and moderately unsteady flow. At a well defined and reproducible "threshold concentration", flocs having interlocked fibers started to form. The interlocking by the elastic bending of fibers was verified to be the source of floc coherence by application of heat which caused stress relaxation in bent fibers and reduction of floc strength. The threshold concentration depended on fiber geometry and viscosity of the suspending liquid. Below an aspect ratio of approximately 50 or above a suspending liquid viscosity of 0.013 Pa-S, coherent flocs did not form at any concentration of fibers.