ISO 7211-4:1984 Preview
Textiles -- Woven fabrics -- Construction -- Methods of analysis -- Part 4: Determination of twist in yarn removed from fabric
This standard was last reviewed and confirmed in 2017. Therefore this version remains current.
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.
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