1 Scope
1.1 This Standard specifies methods for the determination of the breaking force and elongation at break of textile yarns taken from packages.
Four methods are given:
— A: manual; specimens are taken directly from conditioned packages;
— B: automatic; specimens are taken directly from conditioned packages;
— C: manual; relaxed test skeins are used after conditioning;
— D: manual; specimens are used after wetting.
1.2 Method C is used in cases of dispute regarding elongation at break of the yarn.
Note: Methods A, B and C are expected to give the same results for yarn strength, but Method C might give somewhat truer (and higher) values of elongation than A or B. Method D is likely to give results differing, for both breaking force and elongation at break, from those obtained by methods A, B or C.
1.3 This Standard specifies methods using constant rate of specimen extension (CRE) tensile testers. Testing on the now obsolete constant rate of travel (CRT) and constant rate of loading (CRL) instruments is covered, for information, in Annex A, in recognition of the fact that these instruments are still in use and can be used by agreement.
1.4 This Standard applies to all types of yarns, except glass, elastomeric, high molecular polyethylene (HMPE), ultra high molecular polyethylene (UHMPE), ceramic and carbon yarns and polyolefin tape.
1.5 This Standard is applicable to yarns from packages but can be applied to yarns extracted from fabrics, subject to agreement between the interested parties.
1.6 This Standard is intended for the single-end (single-strand) testing of yarns.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 4743 Textiles — Yarn from packages — Determination of linear density (mass per unit length) by the skein method (GB/T 4743-2009, ISO 2060:1994, MOD)
GB/T 6529 Textiles — Standard atmospheres for conditioning and testing (GB/T 6529-2008, ISO 139:2005, MOD)
3 Terms and Definitions
