Fatigue of Fibers by Repeated Washings (Part 1):Changes in Strength, Elongation and Modulus of Initial Elasticity of Nylon-6 Fiber

概要

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To elucidate the mechanism of fatigue of textile fabrics by repeated washings, the model experiments were carried out by employing the launder-o-meter.<BR>The summarized results are as follows : <BR>1. In the case of the synthetic fiber as Nylon-6, transformation of the stress-strain curve and deterioration of the modulus of initial elasticity were observed, which might indicate progress of the fatigue of Nylon-6 fiber during repeated washings.<BR>2. The degree of the fatigue of fiber by repeated washings was affected by the proportion of the volume of washing solution to the fiber weight and by the temperature of the solution. It was found out that the modulus of initial elasticity of the fiber decreased as the proportion became smaller and the temperature rose.<BR>3. From the estimate of the average molecular weight of Nylon-6 fiber obtained by the viscosity method, it was assumed that the physicochemical cause of the fatigue of the fiber by repeated washings was breaking of the molecular chains, which concurred with sliding or slipping-off of the molecular chains.
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