DIN EN ISO 2061:2010-12

This International Standard specifies a method for the determination of the direction of twist in yarns, the amount of twist, in terms of turns per unit length, and the change in length on untwisting, by the direct counting method. This International Standard is applicable to: a) single yarns (spun and filament); b) plied yarns; c) cabled yarns. Separate procedures are given for each of the aforementioned type of yarn. The methods are designed primarily for yarns in packages, but, with special precautions, the procedures can be also used for yarns taken from woven or knitted fabrics. It is not suitable for the determination of twist in a monofilament. This International Standard covers the determination of twist in plied and cabled yarns as follows: a) in plied yarns: - the final twist of the plied yarns and the original twist of the single yarn before plying; b) in cabled yarns: - the final cabling twist of the yarn; - the original twist of the plied yarn after plying, but prior to the last stage of processing; - the twist of the single yarn before plying. If desired, the twist of single and plied yarn components as they lie in the final structure can be determined by the special procedure given in 10.5.7. This International Standard is not applicable, except by agreement, to yarns which stretch more than 0,5 % when the tension increases from 0,5 cN to 1,0 cN per unit linear density of the yarn expressed in tex. Such yarns can be tested under special conditions of tension which are accepted by all parties interested in the test results. This International Standard is not suitable for products of open-end spinning and intermingled (interlaced) multifilament yarns. This International Standard is not applicable to yarns where the yarn is squeezed too much and thus affects the test results. The following changes have been made with respect to DIN EN ISO 2061:1995-11: a) clause 3, Terms and definitions, have been formatted in accordance with the ISO/IEC Directive, Part 2:2004; b) dates of publication have been deleted from the normative references; c) clause "Bibliography" has been supplemented. The Committee responsible for this standard is NA 062-05-21 AA "Physikalisch-technologische Prüfverfahren für Textilien" ("Physical and technological test methods for textiles") at DIN.