IS 832-1985

标准号：IS 832-1985
发布日期：1985/12/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This standard prescribes two methods for determination of direction of twist and amount of twist in terms of turns per metre of single spun, plied and cabled yarn. In case of plied and cabled yarns, direct count method also provides for determination of twist take-up and twist release.1.2 Methods prescribed in this standard are applicable to all textile yarns irrespective of their composition (that is, irrespective of whether a yarn is made of cotton, wool, silk, jute or man-made fibres or a blend of two or more such fibres).1.3 Methods prescribed in this standard may be used to determine the twist of single, plied or cabled yarns removed from fabrics also.Note 1 — For plied yarns direct count method should be preferred as the values obtained by the untwist-retwist method are likely to be influenced by the direction of twist of yarns.Note 2 — However, in case of wool, it is not the practice to determine the twist of yarn removed from fabrics.Note 3 — The turns per metre of yarn removed from fabric may not have a fair relationship with the original twist inserted in the yarn during spinning, particularly in the case of crepe fabrics wherein the crepe effect is produced by the use of highly twisted yarns.Note 4 — The determination of turns per metre of yarn removed from fabric becomes impracticable when the fabric contains some types of finishing materials.