ISO 2061:2015
Textiles - Determination of twist in yarns - Direct counting method

Standard No.

ISO 2061:2015

Release Date

2015

Published By

International Organization for Standardization (ISO)

Latest

ISO 2061:2015

Scope

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), c) cabled yarns. b) plied yarns, and Separate procedures are given for each type of yarn. The method is designed primarily for yarns in packages, but, with special precautions, the procedures can be used for yarns taken from fabrics. It is not suitable for the determination of twist in a monofilament. NOTE See also ISO 1890, which was prepared especially for the needs of glass textile technology, and 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 which are too large to permit their being placed in the clamps of the testing apparatus without crushing or distortion severe enough to affect the test results.

ISO 2061:2015 Referenced Document

• ISO 139:2005 Textiles - Standard atmospheres for conditioning and testing
• ISO 1890:2009 Reinforcement yarns - Determination of twist
• ISO 2:1973 Textiles; Designation of the direction of twist in yarns and related products
• ISO 7211-4:1984 Textiles; Woven fabrics; Construction; Methods of analysis; Part 4 : Determination of twist in yarn removed from fabric

ISO 2061:2015 history

• 2015 ISO 2061:2015 Textiles - Determination of twist in yarns - Direct counting method
• 2013 ISO 2061:2010 Textiles — Determination of twist in yarns — Direct counting method
• 1995 ISO 2061:1995 Textiles - Determination of twist in yarn - Direct counting method
• 1972 ISO 2061:1972 Textiles; Determination of twist in yarns; Direct counting method