Resilience of Scoured Wool

Abstract

The 6 inherent fiber properties, tensile strength, fiber length, fiber thickness, contour (major-minor axis), crimp length to depth ratio, and crimp depth were responsible for 31 % of the variations in the compressional-bulk resilience of wool. In the case of maximum load or stiffness, these same 6 inherent fiber properties were responsible for 85% of the variations. In both cases, the most important inherent property was tensile strength. It accounted for 17% of the variations in the compressional-bulk resilience of wool and for 66% of the variations for maximum load or stiffness. Fiber thickness was the least important while the other inherent factors were intermediate, with contour and crimp affecting resilience and fiber length and crimp affecting maximum load or stiffness.Compressional-bulk resilience has a very narrow range of figures in the three wool types studied, while maximum load has over 4 times the range obtained for resilience. Resilience varies within wool types and is lowest in the fine wools and highest in the medium wools, with long wools intermediate. Stiffness or maximum load is highest in fine wools, lowest in long wools, and intermediate in the medium wools. Only 31 % of the variation in compressional bulk resilience of wool can be accounted for by the variation in the 6 fiber characteristics measured.1. Temperature.

The Characterization of Bulk

“…Van Wyk [50] claimed that the compression of fiber bundles would be independent of.fiber fineness and produced some results to support this theory. Demiruren and Burns [13] contested van Wyk's theory and gave evidence which clearly contradicted it. Hamilton [20] also demonstrated a relationship between fiber fineness and yarn density· Hoffman [24] discussed the ideal packing of uniforl11 rods and showed that, by mixing rods of differing diameter in certain instances, a great increase jn percent free space within the structure was achieved.…”

The Effect of Certain Fiber Properties on Bulk Compressional Resilience of Some Man-Made Fibers

“…Investigations have previously been conducted in this tield by a number of research workers mostly on wool fibers, and these have been reviewed by Demiruren and Burns [1). Recently, Sebestyen and Hickie [2J have reported the effect of certain fiber properties on the compressibility of wool at medium and high pressures.…”

A modified resistance to compression (RtC) test for evaluation of natural fiber softness

“…Early measurements were done, using systems with different cylinders and pistons. [24][25][26] However, when the Australian standard AS 3535-1988 was issued, a standard methodology was introduced and developed as the Commonwealth Scientific and Industrial Research Organization (CSIRO) compressibility tester (Figure 1 (a)). After it had been demonstrated that wool with greater RtC value generally has a harsher handle, 14,27 this instrument was used to grade the softness of Australian wool.…”