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Abstract
Measuring yarn diameter, yarn compressibility and their effect on fabric quality is important to both the fabric designer and the textile technologist. Measurement of yarn diameter is used to predict fabric structural parameters such as width and cover factor. In fact, a slight change in yarn diameter can result in a substantial change in the overall cover factor of fabric. Factors affecting yarn diameter are essentially those that affect yarn density or fibre compactness. Sixty-one different yarns (polyester, viscose, acrylic, cotton and wool) were tested to determine their real diameter by an experimental device. The obtained diameter values are close to those calculated by an established theoretical model. The determination of the real and apparent yarn diameter permits to estimate its packing fraction using his intrinsic parameters.