GB/T 29258-2026Cotton and viscose blended grey yarn (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

This document replaces GB/T 29258-2012 "Combed Cotton-Viscose Blended Natural Yarn". Compared with GB/T 29258-2012, the only differences are in the structural adjustment.

Aside from integration and editorial changes, the main technical changes are as follows.

---The scope of application has been changed (see Chapter 1, Chapter 1 of the 2012 edition);

---Product categories and labels have been changed (see Chapter 4, Chapter 3 of the 2012 edition);

---The grading rules have been changed (see 5.1, 4.2 of the 2012 version);

---Added technical requirements for natural-colored yarn blended from carded cotton and viscose fiber (see 5.2.1);

---Changes were made to the linear density variation coefficient, breaking strength, breaking power variation coefficient, and stripe strength of the combed cotton and viscose blended natural yarn. Versions 4.3.1 to 4.3.8);

---The following sections have been removed from the test methods. test conditions, sampling specifications, blackboard yarn evenness test, yarn bale net weight specifications, and test results.

(See sections 5.1, 5.2, 5.6, 5.11, and 5.12 of the 2012 edition);

---Added a test method for the feather index H value (see Appendix B).

1 Scope

This document provides product classification and marking for natural-colored yarns blended from cotton and viscose fibers (cotton-type staple fibers), and specifies requirements and inspection rules. The markings and packaging describe the corresponding test methods.

This document applies to ring-spun (including traditional ring-spun, Siro-spun, compact-spun, and Siro-compact-spun) cotton (content >=50%) blended with viscose fiber. Spin natural-colored yarn.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies to this document.

GB/T 2543.1 Determination of yarn twist in textiles - Part 1: Direct counting method

GB/T 2910.6 Quantitative chemical analysis of textiles - Part 6: Viscose fibers, certain cuprammonium fibers, modal

GB/T 3292.1 Textiles - Test methods for uneven drying of yarn - Part 1: Capacitance method

GB/T 3916 Textiles - Determination of breaking strength and elongation at break of single yarn in packaged yarns (CRE method)

GB/T 4743-2009 Determination of linear density of yarn in packaged textiles

GB/T 6529 Standard Atmosphere for Conditioning and Testing of Textiles

GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values

FZ/T 01050 Grading and Inspection Methods for Yarn Defects in Textiles - Capacitive Type

FZ/T 01086 Method for determining the hairiness of yarn in textiles - Projection counting method

3 Terms and Definitions

This document does not contain any terms or definitions that need to be defined. fibers or lyocell fibers A mixture of polyester fiber and cotton (formic acid/zinc chloride process)

4 Product classification and labeling

4.1 Cotton and viscose fiber blended natural yarn products are classified according to different production processes, different blending ratios and linear densities.

4.2 The production process and raw material codes for cotton and viscose fiber blended natural yarns are represented by English letters. Sirospun is AA, and compact spinning... The code for Siro compact spinning is JM; the code for traditional ring spinning production process is AAJM; the code for carded cotton is C; and the code for combed cotton is C.

The code is JC, and the code for viscose fiber is R.

4.3 The blending ratio of the product is expressed as a standard mass ratio, specifically as. cotton content/viscose fiber content.

4.4 When marking natural-colored yarns blended from cotton and viscose fibers, the yarn's manufacturing process (or code) and raw material name (or code) should be indicated before the yarn density. (number) and its blending ratio.