GB/T 5881-2024Test methods for physical and chemical properties of ramie fiber (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 for standardization documents" Drafting is required. This document replaces GB/T 5881-1986 "Sampling methods for physicochemical properties of ramie", GB/T 5882-1986 "Breaking strength of ramie bundle fiber" GB/T 5883-1986 "Test method for moisture regain and moisture content of ramie", GB/T 5884-1986 "Test method for count of ramie fiber" GB/T 5885-1986 "Test method for whiteness of ramie fiber", GB/T 5886-1986 "Test method for breaking strength of ramie single fiber" GB/T 5887-1986 "Test method for ramie fiber length", GB/T 5888-1986 "Test method for ramie cellulose polymerization degree", GB/T 5889-1986 "Quantitative analysis method of chemical composition of ramie", GB/T 5881-1986, GB/T 5882-1986, GB/T 5883-1986, GB/T 5884-1986, GB/T 5885-1986, GB/T 5886-1986, GB/T 5887-1986, Compared with GB/T 5888-1986 and GB/T 5889-1986, in addition to structural adjustments and editorial changes, the main technical changes are as follows: Changed the scope (see Chapter 1);

a) Added terms and definitions (see Chapter 3);

b) The sampling methods and sampling quantity regulations for raw ramie, dried ramie, ramie balls, loose ramie and fallen ramie have been changed, and the sampling Steps (see Chapter 4, Chapter 2, Chapter 3, Chapter 4 and Chapter 5 of the 1986 Edition of GB/T 5881);

c) The test method for the sample to reach constant weight condition in the regain and moisture content test was changed, and the sample drying time and value correction were increased. Approximately (see Chapter 5, Chapter 5 of the 1986 edition of GB/T 5883);

d) The whiteness test sample preparation method, test times, and sample quality have been changed; the whiteness coefficient of variation calculation formula has been added (see Chapter 6, Chapter 5 and Chapter 6 of GB/T 5885 (1986 edition);

e) The length test equipment and parameters, test methods and calculation formulas, result calculation and presentation have been changed (see Chapter 7, 1986 (Chapter 4, Chapter 5 and Chapter 6 of the (2016) GB/T 5887);

f) The test method and calculation formula of linear density test have been changed (see Chapter 8, Chapter 5 and Chapter 6 of the 1986 edition of GB/T 5884);

g) The equipment and parameters, test method and calculation formula, result calculation and presentation of single fiber breaking strength test have been changed (see Chapter 9, Chapter 4, Chapter 5 and Chapter 6 of GB/T 5886 (1986 Edition);

h) The instrument and parameters, test method and calculation formula, result calculation and presentation of the fiber bundle breaking strength test have been changed (see Chapter 10, Chapter 4, Chapter 5 and Chapter 6 of GB/T 5882 (1986 Edition);

i) The instrumentation and parameters, test methods and calculation formulas, result calculation and presentation of the chemical composition quantitative analysis method test have been changed. (See Chapter 11, Chapter 4 and Chapter 5 of GB/T 5889 (1986 Edition));

j) The instrument and parameters, test method and calculation formula, result calculation and presentation of fiber polymerization degree test have been changed (see Chapter 13, Chapter 4, Chapter 5 and Chapter 6 of GB/T 5888 (1986 Edition).

k) Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed and coordinated by the National Fiber Standardization Technical Committee (SAC/TC 513). This document was drafted by: Hunan Fiber Testing Institute, Sichuan Fiber Inspection Bureau, Donghua University, China Fiber Quality Monitoring Center Sichuan Zitong Linjiang Ramie Textile Co., Ltd., Hubei Fiber Inspection Bureau Xianning Branch, Changde Fiber Quality Monitoring Center, Hunan Huasheng Co., Ltd., Hunan Institute of Engineering, Daqing Branch of Heilongjiang Academy of Sciences. The main drafters of this document are. Hu Xiaorong, Sun Jin, Li Xian, Xu Guiyong, Gan Dan, Shu Guifang, Cao Qiaoli, Zhang Zuo, Zhao Ruifang, Zhang Bin, Du Long, Xiong Haiying, Yu Chongwen, Liu Fang, Chen Lingling, Tang Wenfeng, Chen Wen, Liu Sijie, Gao Shujing, Zhou Hengshu, Yu Danyao, Wu Dahong, Sun Yufeng, and Xiao Xiang. The previous versions of this document and the documents it replaces are as follows: First published in 1986 as GB/T 5881-1986, GB/T 5882-1986, GB/T 5883-1986, GB/T 5884-1986, GB/T 5 8 8 5 - 1 9 8 6, GB/T 5 8 8 6 - 1 9 8 6, GB/T 5 8 8 7 - 1 9 8 6, GB/T 5 8 8 8 - 1 9 8 6. GB/T 5889-1986. This is the first revision. - Test methods for physical and chemical properties of ramie WARNING - Personnel using this document should have practical experience in formal laboratory work. This document does not purport to address all possible safety issues. The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated by relevant national laws and regulations.

1 Scope

GB/T 5881-2024 gives the Chinese test methods for the physical and chemical properties of ramie fibre. Ramie is a Chinese speciality: China grows and processes the great majority of the world's crop, and the fibre is traded on properties, fineness, strength, residual gum content, whiteness, that have to be measured the same way by seller and buyer or the trade cannot function. The standard sets the sampling scheme first, the batch sample, the laboratory sample and the test specimen, since with a natural fibre the sampling contributes more variance than the measurement; then each determination in turn, with its principle, apparatus, procedure, calculation and expression of results: the moisture regain and moisture content, the residual gum content that governs how the fibre will spin, the fineness, the breaking strength and elongation, the whiteness and colour, the oil content and the other chemical characteristics. It takes effect on 1 February 2025, and for anyone buying, processing or specifying Chinese ramie it is the method a contract dispute is settled by.

This document describes the sampling method of ramie fiber and the regain and moisture content, whiteness, length, linear density, single fiber breaking strength of ramie fiber. strength, single fiber breaking elongation, bundle fiber breaking strength, quantitative analysis of chemical composition, ash content, cellulose polymerization degree, raw hemp rubber content, refined Test methods for physical and chemical properties such as residual rubber rate of dry hemp. This document is applicable to the testing of physical and chemical properties of ramie fibers such as raw ramie, dried ramie, opened ramie, ramie balls, and ramie noil.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies. in this document.

GB/T 1548-2016 Determination of intrinsic viscosity of copper ethylenediamine (CED) solution in pulp

GB/T 3291.1-1997 Textiles Textile materials properties and test terms Part

3 Terms and definitions

The terms and definitions defined in GB/T 5707-2018, GB/T 3291.1-1997, GB/T 1548-2016 and the following apply to this document.

3.1 Short velvet flork Ramie fibres with a length of 15 mm or less.