National Standard of the People's Republic of China

Transcription

1 ICS W04 National Standard of the People's Republic of China GB 9994-xxxx (Replacing GB ) Conventional moisture regains of textiles (Draft for approval) Publishing date: xx-xx-xxxx Implementation date: xx-xx-xxxx Published by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

2 Introduction Chapter 4 of this Standard contains compulsory provisions. This Standard provides a draft of rules according to GB/T This standard replaces GB "Conventional Moisture Regains of Textiles". The main differences between this Standard and GB-9994 include: The term blended product has been changed to multi-component product and notes on the scope have been deleted; The conventional moisture regains of cotton fabric, wool fabric, Modal fibre, and Lyocell fibre and aramid fibre have been modified; The conventional moisture regains of Chitosan fibre, polyethylene terephthalate fibre, polybutylene terephthalate fibre, ultra-high molecular weight polyethylene fibre, polyolefin elastic fibre, polyphenylene sulfide fibre, polyimide fibre and carbon fibre have been added; and Fluorocarbon fibre and its conventional moisture regain have been deleted. This Standard has been proposed by the China National Textile & Apparel Council and is the Basic Standards Subcommittee of the National Technical Committee for Textile Standardization is the authority responsible for this Standard (SAC/TC209/SC1). Bodies responsible for drafting this Standard: the Textile Industry Standardization Institute and the Textile Industry Science and Technology Development Centre. This Standard was drafted by Zheng Yuying, Xu Lu, Sun Ximin and Liu Feifei. Previous versions of this Standard include: GB and GB I

3 Conventional moisture regains of textiles 1 Scope This Standard specifies the conventional moisture regains of major textiles. It applies to textiles and can be used to calculate conventional textile mass, yarn density, fabric mass per unit area and the fibre content in quantitative analysis of multi-component products. 2 Normative reference documents The following documents are indispensable references for this Standard. With regards to reference documents, only the dated version shall be applicable to this Standard. With regards to undated references, the latest edition of the document (including all amendments) shall apply. GB/T Textiles: Chemical Fibres: Generic terms (Part 1) GB/T 9995 Measure of moisture content and regains for textiles: Oven drying method GB/T Textiles: Natural fibres: Terminology 3 Terms and definitions Terms and definitions established in GB/T and GB/T 11951, as well as the following terms and definitions are applicable to this standard. 3.1 Textiles A general term for raw materials to be processed into textiles, semi-finished products and finished products, including fibres, slivers, yarns and fabrics. 3.2 Moisture regain The percentage of the mass of water existing in any form in the textile as compared to the dry mass of the material, measured using the prescribed method. 3.3 Conventional moisture regain The agreed conventional value of moisture regain of a textile Moisture regain in standard atmosphere After a textile is preconditioned, the moisture regain that said textile reaches in standard atmosphere. Conventional mass The mass obtained by adding to the oven-dry mass of the textile to the conventional moisture regain mass of the textile. 1

4 4 Conventional moisture regains of textiles The conventional moisture regains of textiles are listed in Table 1. GB 9994-xxxx 2

5 Table 1 Fibre type Textile Conventional moisture regain (%) Cotton fibre 8.5 Cotton Cotton yarn 8.5 Cotton sewing thread 8.5 Cotton fabric 8.5 Scoured wool b (heterogeneous fleece) Scoured wool b (homogeneous fleece) Comber noil 16.0 Wool Reused wool 17.0 Dry combed top Oil combed top 19.0 Wool a Worsted yarn 16.0 Woolen yarn 15.0 Yarn, knitting yarn 15.0 Woven wool fabric 15.0 Knitted wool fabric 15.0 Long-pile fabric 16.0 Dehaired Cashmere 17.0 Cashmere Cashmere sliver 15.0 Cashmere yarn 15.0 Cashmere fabric 15.0 Rabbit hair 15.0 Camel hair 15.0 Yak hair 15.0 Alpaca 15.0 hair Mohair 14.0 Ramie

6 Flax 12.0 Jute 14.0 Hemp 12.0 Apocynum 12.0 Sisal 12.0 Silk d Other natural fibres c Mulberry silk 11.0 Tussah silk 11.0 Kapok fibre 10.9 Coconut fibre

7 Table 1 (continued) Fibre type Textile Conventional moisture regain (%) Acetate fibres Viscose fibre 13. Polynosic fibre 13. Modal fibre 13. Lyocell fibre 13. Cupro fibre 13. Acetate fibre 7.0 Tri-acetate fibre 3.5 Chitosan fibre 17. Polyamide fibre (nylon) 4.5 Polyethylene terephthalate (polyester) 0.4 Polytrimethylene terephthalate fibre 0.4 Chemical fibres c Polybutylene terephthalate fibre 0.4 Polyacrylonitrile fibre (acrylic) 2.0 Polyvinyl alcohol fibre (PVA) 5.0 Polypropylene fibre (PP) 0.0 Polyethylene fibre 0.0 Ultra-high molecular weight 0.0 Chlorinecontaining fibres Polyvinyl chloride (PVC) 0.0 Polyvinylidene chloride (saran) 0.0 Aromatic polyamide fibres (Aramid fibres) Spandex 1.3 Fluorine 0.0 Aramid Aramid 1414 (high modulus) 3.5 Aramid 1414 (other) 7.0 Polylactic acid fibre 0.5 Polyolefin elastic fibre 0.0 Elastodiene fibre (rubber) 0.0 Polyphenylene sulfide fibre 0.1 Polyimide fibre 1.5 Carbon fibre 0.0 5

8 Glass fibre 0.0 Metal fibre GB 9994-xxxx a Besides wool and cashmere, other animal hair fibres all comprise fibres, yarns and fabrics. b Scoured wool includes carbonized wool. C Comprises fibres, yarns and fabrics. d Includes raw silk, dupioni silk, spun silk, processed silk, as well as and bleached, printed and dyed fabric Moisture regains for fibres with unknown moisture regains and the products thereof 5.1 Regarding new types of fibres, or those with unknown moisture regains and the products thereof, the standard fibre moisture regains can replace the conventional moisture regains. 6

9 5.2 The standard moisture regains shall be measured in accordance with the requirements of GB/T Note: An explanatory note shall be made where a standard moisture regain in a standard atmosphere is used instead of conventional moisture regain. 6. The moisture regains of multi-component products 6.1 The conventional moisture regains of multi-component textile products are calculated by comparing the weighted average of the conventional moisture regains of each raw material with that of the multi-component product, and rounded off to the nearest decimal. 6.2 The conventional moisture regain of multi-component products may be calculated either according to oven-dry mass blend ratio, or the conventional mass blend ratio. See Formulae 1 and 2. Note: To facilitate calculation, the conventional mass blend ratio is usually converted into the oven-dry mass blend ratio before using Formula 1) for calculation. a) Formula 1: The conventional moisture regain (R) is calculated using the oven-dry mass blend ratio and is expressed as a percentage: R= A 1 R 1 +A 2 R 2 + +A n R n 100 a) Formula 2: The conventional moisture regain (R) is calculated using the conventional mass blend ratio and is expressed as a percentage: Where, A 1, A 2, A n is the oven-dry mass blend ratio of the fibre components in a multicomponent product, expressed as a percentage; B 1, B 2 B n is the conventional mass blend ratio of the fibre components in a multicomponent product, expressed as a percentage; and R 1,R 2. R n is the conventional moisture regain of each fibre component, expressed as a percentage. 7. Calculation of conventional mass 7.1 The conventional mass (Mr) of a single fibre is calculated using Formula 3. Where 7

10 m d is the oven-dry mass, measured in the same units as the conventional mass; and R is the conventional moisture regain, expressed as a percentage. GB 9994-xxxx 7.2 The conventional mass (Mr) of a multi-component product is calculated using Formula 4. Where, m d1,m d2 m dn is the oven-dry mass of each fibre component, measured in the same units as the conventional mass; and R 1,R 2 R n is the conventional moisture regain of each component, expressed as a percentage. 8