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ISO 7211-4:1984 Textiles -- Woven fabrics -- Construction -- Methods of analysis -- Part 4: Determination of twist in yarn removed from fabric
standard by International Organization for Standardization, 03/01/1984
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Only applicable to yarns spun on conventional systems and not applicable to OE (open-end spun) or interlaced yarns, for example. A length of yarn is removed from the fabric and, while under tension, is secured in two clamps which are at a known distance apart. One of these clamps is then rotated until all twist is removed from the length of yarn.