The standard uses capital lettersS and Z to indicate the direction of twist,[2] as suggested by the direction of slant of the central portions of these two letters. The handedness of the twist is the direction of the twists as they progress away from an observer. Thus Z-twist is said to be right-handed, and S-twist to be left-handed. The convention of using these two letters to unambiguously designate twist direction was already used in the cordage industry by 1957.[3]
^The International Bureau For The Standardisation of Man-Made Fibres (BISFA) (2009), (PDF), p. 49, archived from the original (PDF) on 2015-11-23, retrieved 2013-08-04
^Himmelfarb, David (1957). The Technology of Cordage Fibres and Rope. London: Leonard Hill. p. 116.
External linksedit
ISO 2:1973 Textiles — Designation of the direction of twist in yarns and related products
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letter, country, codes, 3166, alpha, international, standard, direction, twist, designation, yarns, complex, yarns, slivers, slubbings, rovings, cordage, related, products, twist, twist, standard, uses, capital, letters, indicate, direction, twist, suggested, . For two letter country codes see ISO 3166 1 alpha 2 ISO 2 is an international standard for direction of twist designation for yarns complex yarns slivers slubbings rovings cordage and related products 1 S twist and Z twist The standard uses capital letters S and Z to indicate the direction of twist 2 as suggested by the direction of slant of the central portions of these two letters The handedness of the twist is the direction of the twists as they progress away from an observer Thus Z twist is said to be right handed and S twist to be left handed The convention of using these two letters to unambiguously designate twist direction was already used in the cordage industry by 1957 3 References edit International Organization for Standardization 1973 ISO 2 1973 Textiles Designation of the direction of twist in yarns and related products retrieved 2013 08 04 The International Bureau For The Standardisation of Man Made Fibres BISFA 2009 Terminology of man made fibres PDF p 49 archived from the original PDF on 2015 11 23 retrieved 2013 08 04 Himmelfarb David 1957 The Technology of Cordage Fibres and Rope London Leonard Hill p 116 External links editISO 2 1973 Textiles Designation of the direction of twist in yarns and related products nbsp This standards or measurement related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title ISO 2 amp oldid 1130428411, wikipedia, wiki, book, books, library,
