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[[File:Yarn twist S-Left Z-Right.png|thumb|upright|S-捻和Z-捻]]<br />
'''ISO 2'''是由[[国际标准化组织]]为[[纱线]]、[[绳索]]以及其它相关产品定义的关于捻向的国际标准。<ref name="ISO2">{{Citation|title=ISO 2:1973 Textiles — Designation of the direction of twist in yarns and related products|author=[[International Organization for Standardization]]|url=http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=3563|year=1973|accessdate=2013-08-04|archive-date=2017-01-07|archive-url=https://web.archive.org/web/20170107005000/http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=3563|dead-url=no}}</ref>而在1957年以前，制绳业就已经开始使用S和Z这两个字母来明确指定捻向了。<br />
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该项标准用大写的'''S'''和'''Z'''两个字母中间部分的倾斜方向来指示捻向<ref name="bisfa2009">{{Citation|title=Terminology of man-made fibres|author=The International Bureau For The Standardisation of Man-Made Fibres (BISFA)|page=49|url=http://www.bisfa.org/Portals/BISFA/Terminology/BISFA%20Terminology2009%20%28final%20version%29.pdf|year=2009|accessdate=2013-08-04|archive-url=https://web.archive.org/web/20140411093717/http://www.bisfa.org/Portals/BISFA/Terminology/BISFA%20Terminology2009%20(final%20version).pdf|archive-date=2014-04-11|dead-url=yes}}</ref>。纱线的[[手征性]]也由捻向确定。纤维沿顺时针螺旋上升的是左旋性的S捻，沿逆时针螺旋上升的是右旋性的Z捻。用这两个字母明确定义捻向的惯例已在1957年用于绳索行业<ref name="CordTech">{{Cite book|last=Himmelfarb|first=David|title=The Technology of Cordage Fibres and Rope|location=London|publisher=Leonard Hill|year=1957|page=116}}</ref>。<br />
== 参见 ==<br />
* [[手征性]]<br />
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== 参考文献 ==<br />
{{Reflist}}<br />
== 外部链接 ==<br />
* [http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=3563 ISO 2:1973]{{Wayback|url=http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=3563 |date=20170107005000 }} Textiles — Designation of the direction of twist in yarns and related products<br />
{{ISO}}<br />
[[Category:ISO標準|#00002]]<br />
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