GB/T 6836-2018Sewing thread (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 6836-2007 "Sewing thread". Compared with GB/T 6836-2007, the main technical changes are as follows.

--- Revised scope (see Chapter 1, Chapter 1 of the 2007 edition);

--- Increased terms and definitions such as the line of stagnation, cobwebs (see Chapter 3);

--- Removed the composite strand specification, twist (reference) index, adjust the single-line breaking strength, fracture strength coefficient of variation technical indicators (See Table 1, Table 3, Table 4 of the 2007 edition);

--- Appropriately improved the wet fastness requirements of cotton sewing threads (see Table 5, Table 6 of 2007);

--- Increased the allowable deviation rate of knots and length (see Table 2, Table 5, 2007 editions Table 2, Table 6);

--- Supplemented and improved the test method for the length of the sewing thread (see 5.4, 2007 edition 6.7);

--- Revised the sampling method in the appearance inspection, and improved the requirements for the appearance of the miss rate (see Table 8, 2007 version of Table 9);

--- Increased the calculation formula for the breaking strength of sewing thread (see Appendix A).

1 Scope

This standard specifies the terms and definitions, requirements, test methods, acceptance rules, packaging, marking, transportation and storage of sewing thread products.

This standard applies to polyester sewing thread, carded cotton sewing thread and combed cotton sewing thread.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 250 Textile color fastness test for gray color card for color change

GB/T 251 Textile color fastness test evaluation gray sample card for staining

GB/T 2828.1. Sampling procedures for sampling by sampling - Part 1. Batch-to-batch sampling plan, searched by AQL

GB/T 3916 Textile yarns - Determination of breaking strength and elongation at break of single yarns (CRE method)

GB/T 3920 Textile color fastness test color fastness to rubbing

GB/T 3921-2008 Textile color fastness test color fastness to soaping

GB/T 4743-2009 Determination of normal density of skein of textile packaged yarn

GB/T 4856 needle cotton fabric packaging

GB/T 5296.4 Instructions for use of consumer products - Part 4: Textiles and clothing

GB/T 6529 Standard atmosphere for textile conditioning and testing

GB 18401 National Textile Products Basic Safety Technical Specifications

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 Polyester sewing thread

Sewing thread made of polyester (polyethylene terephthalate) staple fiber.

4 Requirements