GB/T 398-2018Cotton grey yarn (English PDF)

Foreword

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

This standard replaces GB/T 398-2008 "cotton color yarn". Compared with GB/T 398-2008, the main technical changes are as follows.

--- Adjusted the classification and marking of yarns, moved the standard quality calculation of the 100-meter yarn to Appendix B, and canceled the cotton yarn Weigh the series of linear density and its standard weight of 100m (see Chapter 3 of the 2008 edition);

---The linear density deviation rate (original "100m weight deviation"), linear density coefficient of variation (formerly "100m weight coefficient of variation"), single yarn break The strength has been adjusted, and the requirements for the evaluation of the kilometer cotton knot have been increased, and the appearance of the blackboard such as the uniformity of the single yarn and the horizontal line of the strand has been eliminated. Quality assessment requirements, the number of black slabs and the total number of impurities in the blackboard neps are classified into Appendix A (informative appendix), Party agreed to assess (see Table 1 to Table 4, Table 4 to Table 7 of the 2008 edition);

--- The stock index has increased the coefficient of variation of the coefficient of variation (see Table 2, Table 4);

--- Removed the provisions of the weaving yarn for weaving (see Table 8, Table 9 of the 2008 edition);

--- Cancel the number of tubes and the number of trials, adjust to directly sample the finished product, the number and number of samples according to the requirements of each test method Execution (see Table 11 of the 2008 edition);

--- Removed the original Appendix A strong correction factor (see Appendix A of the 2008 edition);

--- Removed the numerical revision of the calculated value (see Table 12 of the 2008 edition).

1 Scope

This standard specifies the product classification, marking, requirements, test methods, inspection rules and signs, and packaging of cotton yarns.

This standard applies to ring-spun cotton natural yarn (woven yarn).

This standard does not apply to cotton yarns for special purposes.

2 Normative references

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

GB/T 2543.1 Textiles -- Determination of yarn twisting -- Part 1. Direct counting method

GB/T 3292.1 Test methods for dryness of textile yarns - Part 1

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

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

GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values

FZ/T 01050 Grading and inspection methods for textile yarn defects - Capacitive

FZ/T 10007 cotton and chemical fiber pure spinning, blended natural yarn inspection rules

FZ/T 10008 cotton and chemical fiber pure-spun, blended natural yarn logo and packaging

3 Product classification, marking

3.1 The product specifications of cotton yarns are classified by different production processes and line densities.

3.2 The production process and raw material code of cotton color yarn are indicated by English letters, C is cotton (carded cotton) code, JC is combed cotton Code.

3.3 When the cotton color yarn is marked with the code, the yarn production process code, raw material code, and online density mark should be marked before the online density. Ming use code and package form.

Example 1. A linear density of 14.8 tex carded cotton yarn yarn should be written as. C14.8 texD.

Example 2. A linear density of 14.8 tex combed cotton natural 2 strands for warp yarns, which should be written as. JC14.8tex x 2TR.

Note: The inch count and the tex conversion factor of the yarn are 590.5.

4 Requirements