This standard specifies two testing methods for linear density of man-made fibres: bundle fibre midsection weighing method (Method A) and single fibre vibrating meter method (Method B).
This standard is applicable to the determination of linear density of man-made staple fibres made of polyester (dacron), polyamide (Nylon), polyacrylonitrile (acrylon), polypropylene (PP), polyvinyl formal (nylon) and regenerated cellulose. During the test for the aforesaid methods, a certain tension shall be applied to the fibres to straighten it and clear away the crimp, so as to guarantee the effectiveness of test results. Whether to adopt Method A or Method B shall be determined through negotiation by both parties concerned according to actual conditions.
2 Normative References
The following standard contains provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document applies.
GB/T 3291.1 Textiles - Terms of Textile Material Properties and Test - Part 1: Fibre and Yarn
GB/T 6529 Textiles - Standard Atmospheres for Conditioning and Testing
GB/T 8170 Rules of Rounding-off for Numerical Values
GB/T 14334 Sampling Method for Man-made Staple Fibres
GB/T 15000.8 Directives for the Work of Reference Materials (8) - Uses of Certified Reference Materials
3 Terms and Definitions
For the purposes of this standard, the terms and definitions defined in GB/T 3291.1 and GB/T 15000.8 apply.
