Testing method for elasticity of spandex filament yarns
1 Scope
This standard specifies the testing method for elasticity of spandex filament yarns.
This standard is applicable to spandex filament yarns, and may be used as a reference for other elastic fibers.
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 documents (including any amendments) applies.
GB/T 3291.1 Textiles - Terms of textile material properties and test - Part 1: Fibre and yarn
GB/T 3291.3 Textiles - Terms of textile material properties and test - Part 3: General
GB/T 4146.1 Textiles - Man-made fibres - Part 1: Generic names
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 3291.1, GB/T 3291.3 and GB/T 4146.1 as well as the following apply.
3.1
cycle elongation
maximum elongation in tensile recovery circulation
3.2
tensile recovery circulation
repeated process of continuously tensioning the sample to the selected cycle elongation from specified initial length at specified tensile speed without loosening the clamp, and then returning to the initial length
3.3
stress relaxation
phenomenon that the stress in the fiber gradually decays with time at a constant temperature and at a given deformation
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus and appliances
6 Standard atmosphere for conditioning and testing
7 Sample preparation
8 Testing procedures
9 Testing report
