1 Scope

This standard specifies the terms and definitions, product specification representation methods, requirements, testing and judgment rules, identification, packaging, transportation, and storage of nylon (polyester)/spandex double wrapped yarn for knitting This standard is applicable to silk threads formed by using a single spandex filament as the core wire at a certain draft ratio and wrapping it with two layers of nylon (polyester) filaments twisted in different directions. Products coated with elastic silk and other similar products can refer to the implementation This standard is not applicable to special purpose or industrial double wrapped wire products

2 Normative References

The following documents are essential for the application of this document.

. For dated references, only the dated version applies to this document. For undated references, the latest version (including all modification orders) applies to this document GB/T 250 Textiles - Color Fastness Tests for Evaluation of Discoloration - Grey Scale

GB/T 2543.1 Textiles - Determination of Yarn Twist - Part 1: Direct Counting Method GB/T 2910 (All Parts) Quantitative Chemical Analysis of Textiles

GB/T 3291.1: Textiles, Textile Materials, Performance and Testing Terminology Part 1: Fibers and Yarns GB/T 3291.3 Textile Materials, Performance and Testing Terminology Part 3: General

GB/T 3920 Textiles, Color Fastness Tests to Rubbing

GB/T 3921-2008 Textiles, Color Fastness Tests to Soap

GB/T 3922 Textiles, Color Fastness Tests to Sweat

GB 5296.4 Instructions for the Use of Consumer Products, Part 4 Part; Textiles and Clothing GB/T5713 Textiles - Tests for Color Fastness to Water

GB/T 6502 Sampling Methods for Chemical Fibers and Filaments

GB/T 6529 Standard Atmosphere for Humidity Control and Testing of Textiles

GB/T 8170 Rules for Rounding off Values and Representation and Determination of Limit Values GB/T 8693- Marking of Textile Yarns

GB/T 14343 Test Method for Linear Density of Chemical Fibers and Filaments GB/T 17592 Determination of Prohibited Azo Dyes in Textiles GB 18401 National Textile Products Basic Safety Technical Specification GB/T 29862

Function of testing report:

1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report

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5. Judicial services: providing scientific, fair, and accurate testing data

6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems

100% inspection and testing process:

1. Telephone communication and confirmation of requirements

2. Recommend solutions and confirm quotations

3. Mail samples and arrange testing

4. Progress tracking and result feedback

5. Provide reports and after-sales service

6. If urgent or priority processing is required

Testing and testing characteristics:

1. The testing industry is fully covered, meeting different testing needs

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7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc

8. The testing report is authoritative and effective, and is generally used in China