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Linear Viscoelasticity Applied to Wool Setting Treatments

CSIRO Division of Textile Physics, Ryde, NSW 2112 Australia

An account is given of setting experiments in hot water or urea/bisulfite solutions done on keratin fibers stretched up to 5% strain. The fibers are released in water at 20°C. A formula is derived to describe the setting process in viscoelastic terms. The formula correctly predicts the amount of set or contraction in wool subsequent to a setting treatment. The formula breaks up into separate observations the factors con trolling the set produced in a fiber. The formula holds because, after setting, the fiber can be regarded as being linearly viscoelastic about its set length. The dominant factor in producing the set in a fiber is the retractive force in the fiber prior to release; however, the stiffness of the fiber after release and its decay also are significant. The stiffness of a set fiber appears to age or increase with time after release in water. The initial stiffness of the fiber after release partly determines its set.

Textile Research Journal, Vol. 55, No. 11, 647-653 (1985)
DOI: 10.1177/004051758505501103


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