1 Scope
This standard specifies testing methods for the length of man-made staple fibres: bundle fibre midsection weighing method, single fibre instrument measurement method (Annex A) and single fibre manual measurement method (Annex B). In case of any dispute, bundle fibre midsection weighing method shall be adopted, and where it is not applicable, the testing method agreed by the relevant parties shall prevail.
This standard is applicable to the determination of mean length, length deviation rate, percentage of overlength fibre and content of multiple-length fibre of man-made staple fibres made of polyester (dacron), polyamide (nylon), polyacrylonitrile (acrylon), polypropylene (PP), polyvinyl formal (vinylon) and cellulose.
2 Normative References
The following standards contain provisions which, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies.
GB/T 3291.1 Textiles - Terms of Textile Material Properties and Test - Part 1: Fibre and Yarn
GB/T 6529 Standard Atmosphere for Textiles Conditioning and Testing
GB/T 8170 Rules for Rounding-off of Numerical Values
GB/T 14334 Sampling Method for Man-made Staple Fibres
3 Terms and Definitions
For the purposes of this standard, the terms and definitions specified in GB/T 3291.1 and those listed below apply.
Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 General Testing Principles
5 Testing Method - Bundle Fibre Midsection Weighing Method
6 Result Calculation
7 Data Rounding-off
8 Testing Report
Annex A (Informative) Single Fibre Instrument Measurement Method
Annex B (Informative) Single Fibre Manual Measurement Method
Annex C (Informative) Rapid Conditioning Time
Annex D (Informative) Calculation Method for Pre-tension
Annex E (Normative) Statistics: Terms and Calculation
