Abstract
The crimp in all-cotton, nylon, and polyester/spandex core stretch fabrics was ex amined by physical tests and by photographic enlargements of yarns and fibers removed from the fabrics. Measurements of total crimp and crimp due to yarn crossover indicate that yarn crossover crimp, external yarn crimp, has a major influence on the stretch and recovery properties of the comfort stretch fabrics having less than 30% stretch. Hysteresis curves show that faisetwisted nylon is significantly changed by weaving and subsequent finishing treatments. Nylon yarns raveled from stretch fabrics and filaments removed from the yarn show no evidence of residual effects of fatsetwisting if the fabric has less than 30% easy strech. The limited data obtained in this study indicate that interfiber friction may play a significant part in the stretch and recovery properties of all-cotton stretch fabrics. These data also suggest that fabric design and processing procedures that promote crossover yarn crimp are the areas most likely to improve the stretch and recovery properties of a comfort stretch cotton fabric.
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