Abstract
The work of earlier papers in this series is extended by quantifying the level of wool fabric ageing that occurs in actual garment wear. The main experimental variables considered in this paper are the ageing history of the fabric, the time of wear, the level of physical activity attributed to the subject wearers, and the position of the fabric test sample on a pair of trousers worn by each subject wearer, that is, the lap , crutch, behind the knee, and the cuff. Fabric ageing is evaluated from bending stress relaxation measurements made on the fabric test samples subjected to two sets of ambient con ditions : constant temperature and relative humidity (20°C, 65% RH), and conditions of changing relative humidity at constant temperature. The fabric stress relaxation rate is always higher for fabrics after wear than the corresponding control fabric sample, which was merely allowed to age for the same time but was not subjected to any wear. Significant differences in fabric bending stress relaxation rates under both constant and changing humidity conditions occur as a result of different levels of subject wearer activity. The fabric bending stress relaxation rate for an initially aged fabric that has been worn for an average of 1.5 days is equivalent to one of the standard de-ageing treatments [2] used in fabric wrinkle testing.
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