Abstract
An empirical study to determine the quantitative relationships between changes in the dimensions of wool fabrics during finishing and the resultant changes in extensibility, relaxation shrinkage, and hygral expansion is reported. Sufficiently quantitative correlations can be obtained between relaxation shrinkage, extensibility, and dimensional change of wool fabrics to allow the finisher to ‘engineer’ these fabric properties in a simple temporary-setting operation. However, the response of fabric extensibility to dimensional change depends on yarn interaction within the fabric. A permanent-setting operation can be used to control hygral expansion by engineering the relaxed dimensions of the fabric. Unfortunately, unless the fabric has been permanently set in some earlier operation (e.g. piece-dyeing), the response of fabric to changes in the relaxed dimension is affected by the setting process.
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