What is ISO 16549 about ?
ISO 16549 is a series on textiles. A textile is a flexible material made by creating an interlocking bundle of yarns or threads, which are produced by spinning raw fibres into long and twisted lengths. ISO 16549 describes a method, using capacitance measuring equipment, for determining the unevenness of linear density along the length of textile strands.
ISO 16549 is applicable to tops, slivers, roving is, spun yarns, and continuous filament yarns, made from either natural or man-made fibres, in the range of 4 texes (g/km) to 80 kthx (kg/km) for staple-fibre strands and 1 tex(g/km) to 600 texes (g/km) for continuous-filament yarns. It is not applicable to fancy yarns or to strands composed fully or partly of conductive materials such as metals; the latter requires an optical sensor, and to raw silk filaments which are tested according to a specific standard.
ISO 16549 describes the preparation of a variance-length curve, as well as the determination of periodicities of linear density. It also covers the counting of imperfections in the yarn, namely of neps and of thick and thin places.
Who is ISO 16549 for ?
ISO 16549 on textile is useful for:
- Textile manufacturer
- Textile testing institutions
- Quality control personnel
Why should you use ISO 16549 ?
Textiles are then formed by weaving, knitting, crocheting, knitting, tatting, felting, bonding, or braiding these yarns together. Unevenness, regularity, and irregularity are common terms used to describe the degree of uniformity of a textile product. In the textile field, the uniformity of products like the lap, sliver, roving, or yam is expressed in terms of evenness or regularity or in terms of unevenness or irregularity. The method used to detect unevenness of textile is capacitance, which is a sensing method for detection, counting, or characterizing of the nanolitre droplets, cells, or other microparticles by measuring the capacitance change between a pair of electrically charged and isolated conductors. ISO 16549 determines the unevenness of linear density along the length of textile strands. Unevenness is a fundamental feature of yarn construction. It influences the efficiency of processing as well as fabric appearance. Lower unevenness results in a better-looking fabric, but the relation is not simple, and interpretation requires particular care so, for a better appearance of the textile, the unevenness of textile must be less which gives the best appearance for the textile so better appearance goods will increase the demand for the good and supply, goodwill all these will increase the profitability of the business. Using ISO 16549 you can describe a method, using capacitance measuring equipment, for determining the unevenness of linear density along the length of textile strands.
What is changed since the last update ?
BS ISO 16549:2021 supersedes ISO 16549:2004. BS ISO 16549:2021 includes some technical and editorial changes with respect to ISO 16549:2004. These include:
- Correction of the description of test specimen length in length within
- Correction of the description of mass “normal” (“Gaussian”) distribution
- Correction of the description of the measuring device
- Inscription of a method for optimum twist application on multi-filament yarns
- Designation of twisting device speed (if the twist was applied)