20/30406530 DC - BS ISO 16549. Textiles. Unevenness of textile strands. Capacitance method

20/30406530 DC

BS ISO 16549. Textiles. Unevenness of textile strands. Capacitance method

Status : Current, Draft for public comment   Published : April 2020



This International Standard describes a method, using capacitance measuring equipment, for determining the unevenness of linear density along the length of textile strands.

The method is applicable to tops, slivers, rovings, spun yarns and continuous filament yarns, made from either natural or man-made fibres, in the range of 4 tex (g/km) to 80 ktex (kg/km) for staple-fibre strands and 1 tex(g/km) to 600 tex (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 require an optical sensor (see A.4).

The method describes the preparation of a variance-length curve, as well as the determination of periodicities of linear density. It covers also the counting of imperfections in the yarn, namely of neps and of thick and thin places.

Irregularities in the distribution of additives such as sizes, in moisture content and in fibre blending may increase the measured unevenness above its true value.

Standard Number20/30406530 DC
TitleBS ISO 16549. Textiles. Unevenness of textile strands. Capacitance method
StatusCurrent, Draft for public comment
Publication Date23 April 2020
Normative References(Required to achieve compliance to this standard)ISO 139
Informative References(Provided for Information)ISO 2649:1974
International RelationshipsISO/DIS 16549
Draft Expiry Date16 June 2020
DescriptorsStaple fibre, Filament (textile fibre), Yarn testing, Natural fibres, Man-made fibres, Textile fibres, Yarn linear density determination, Textiles, Textile testing, Linear density, Capacitance measurement
Title in FrenchTextiles — Irrégularité des fils textiles — Méthode capacitive
File Size366 KB
NotesWarning: this draft is not current beyond its expiry date for comments.

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