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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 9994-2008 Conventional Moisture Regains of Textile Materials. The following changes have been made with respect to GB/T 9994-2008:
——"Blended products" is changed into "Multi-component products" and note in the “Scope” is deleted;
——Conventional moisture regains of cotton fabrics, wool woven fabrics, modal fibers, lyocell fibers and aramid fibers are modified;
——Conventional moisture regains of chitosan fiber, polytrimethylene terephthalate fiber, polybutylene terephthalate fiber, ultra high molecular weight polyethylene fiber, polyolefin elastic fiber, polyphenylene sulfide fiber, polyamide fibers and carbon fibers are modified;
——Fluorocarbon fibers and their conventional moisture regain are deleted.
This standard was proposed by China National Textile and Apparel Council.
This standard is under the jurisdiction of the National Technical Committee 209 on Textiles of the Standardization Administration of China (SAC/TC 209).
The previous editions of standard replaced by this standard are as follows:
——GB 9994-1988, GB 9994-2008, GB/T 9994-2008.
Conventional Moisture Regains of Textile Materials
1 Scope
This standard specifies the conventional moisture regains of main textile materials.
This standard applies to textile materials and may be used to calculate the conventional mass of textile materials, linear density of yarns, mass per unit area of fabrics, and the fiber content of multi-component products in quantitative analysis.
2 Normative References
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 4146.1 Textiles - Chemical Fibers - Part 1: Generic Names
GB/T 9995 Determination of Moisture Content and Moisture Regain of Textile - Oven-drying Method
a Except wool and cashmere, other animal hair fibers contain fibers, yarns and fabrics.
b Scoured wool contains carbonized hair.
c Contains fibers, yarns and fabrics.
d Contains raw silk, doupion silk, spun silk, bourtte silk, processed silk and whitened, printed and dyed fabrics etc.
5 Fibers with Unknown Moisture Regain and Moisture Regain of Their Products
5.1 For other fibers and their products with new or unknown conventional moisture regain, the moisture regain of fiber state in standard atmosphere may be used to replace the conventional moisture regain.
5.2 The determination of moisture regain in the standard atmosphere shall meet the requirements specified in GB/T 9995.
Note: where the moisture regain in the standard atmosphere is used to replace the conventional moisture regain, corresponding explanation shall be made.
6 Moisture Regain of Multi-component Products
6.1 The conventional moisture regain of multi-component products is obtained by weighted average according to the conventional moisture regain and blending ratio of each component raw materials, and is rounded to one decimal place.
6.2 The conventional moisture regain of multi-component products may be calculated according to dry mass blending ratio, or may be calculated according to conventional mass blending ratio; see Formulas (1) and (2).
The conventional moisture regain (R) is calculated according to dry mass blending ratio, and is expressed in %:
Foreword i 1 Scope 2 Normative References 3 Terms and Definitions 4 Conventional Moisture Regains of Textile Materials 5 Fibers with Unknown Moisture Regain and Moisture Regain of Their Products 6 Moisture Regain of Multi-component Products 7 Calculation of Conventional Mass