This standard specifies terms and definitions, requirements, grading requirements, test methods, acceptance rules, packaging marks, transport and preservation of polyester, cotton and cotton glazed sewing thread products.
This standard is applicable to the quality verification for polyester, cotton and cotton glazed sewing threads.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB 250 Gray Scale for Assessing Change in Color
GB 251 Gray Scale for Assessing Staining
GB/T 2543.1 Textiles - Determination of Twist in Yarns - Part 1: Direct Counting Method
GB/T 3916 Textiles - Yarns from Packages - Determination of Single-end Breaking Force and Elongation at Break
GB/T 3920 Textiles - Tests for Color Fastness - Color Fastness to Rubbing
GB/T 3921.3 Testiles - Tests for Color Fastness to Washing: Test 3
GB/T 4743-1995 Textiles - Yarn from Packages - Determination of Linear Density (Mass per Unit Length) by the Skein Method
GB/T 4856 Package of Cotton Goods and Knitwear
GB 5296.4 Instructions for Use of Products of Consumer Interest - Instructions for Use of Textiles and Apparel
GB 18401 National General Safety Technical Code for Textile Products
3 Terms and Definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
cotton mercerized sewing threads
cotton sewing threads treated with mercerization
3.2
grey cotton sewing threads
non-mercerized cotton sewing threads
4 Requirements
4.1 Requirements for cotton, cotton glazed and polyester sewing threads
The requirements for cotton, cotton glazed and polyester sewing threads are classified into those for inherent quality and those for appearance quality. The requirements for inherent quality include those for single thread breaking strength, linear density deviation rate, variation coefficient of single thread breaking strength, color fastness to washing, color fastness to rubbing, permissible length deviation rate and knot quantity. The requirements for appearance quality include those for surface knots, oil stain, color difference, dyeing defect, filling and other three defects.
