GB/T 18888-2022Cottonized flax (English PDF)

Foreword

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

This document replaces GB/T 18888-2002 "Linen Cotton". Compared with GB/T 18888-2002, except for structural adjustments and editorial changes, the main technical changes are as follows:

a) Deleted product classification (see Chapter 4 of the 2002 edition);

b) Changed the technical requirements index (see Table 1, Table 1 of the 2002 edition), and changed the revision requirements for moisture regain (see Table 1, of the 2002 edition) 5.2);

c) increased breaking strength (see 5.6);

d) Change the sampling requirements (see 6.1, 7.1 of the 2002 edition);

e) The acceptance requirements for the net weight of the package are deleted (see 7.4 of the 2002 edition);

f) Changed the requirements for marking, packaging, transportation and storage (see Chapter 7, Chapter 8 of the 2002 edition);

g) The test methods for average length, short fiber rate and super-long fiber rate are added (see Appendix A);

h) The test method for linear density (splitting degree) has been added (see Appendix B).

1 Scope

This document defines the terms and definitions of linen cotton, specifies the technical requirements for linen cotton, describes the corresponding test methods, inspection rules, marking, packaging, transportation and storage.

This document applies to the quality grading of linen cotton.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 3291.1 Textile and Textile Material Properties and Test Terms Part 1: Fibers and Yarns

GB/T 5707 Terminology of Textiles and Linen Textile Products

GB/T 6529 Standard atmosphere for textile humidity conditioning and testing

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

GB/T 9995 Determination of moisture content and moisture regain of textile materials by oven drying method

GB/T 18147.5 Test methods for hemp fibers - Part 5: Test methods for breaking strength

3 Terms and Definitions

The terms and definitions defined in GB/T 3291.1, GB/T 5707 and the following apply to this document.

4 Requirements

The technical requirements of linen cotton are shown in Table 1.