1.1 本试验方法包括测定包装中所有类型的棉、毛、精纺和人造纤维纱线的纱线数；或者从其中纱线完整并且可以以可测量的长度去除的任何纺织物中去除。本试验方法不适用于从绒毛织物或切绒织物中提取的纱线。由于该试验方法基于短长度试样，因此结果仅应视为纱线数量的近似值。 注1: 有关测定纱线数的更精确程序，请参阅测试方法 907年 . 注2: 以下用于确定特定纤维纱线纱线数的附加方法已获得批准:规范 D541型 , D578年 和 D681型 . 1.2 本试验方法适用于当纱线张力从0.25至0.75 cN/tex（0.25至0.75 gf/tex）时拉伸小于5%的纱线。经双方同意，其可适用于通过使用低于弹性体方法中规定的张力或使用高于方法中规定张力的张力拉伸变形纱线的卷曲而拉伸超过5%的纱线。 1.3 以国际单位制表示的值应视为标准值。SI单位后括号中给出的值仅供参考，不视为标准值。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 这是一种快速测定从包装或织物上取下的短长度试样的近似纱线数的方法。 5.2 因为当使用 公式2 或 公式3 ，尽可能精确地测量长度非常重要。 5.3 对于织物的分析，该试验方法足以估计用于织物或针织织物的纱线的近似纱线数，但由于织物或编织操作、整理处理、织物表面处理和织物的表面处理所产生的纱线数的变化，以及解剖手术。 当需要该信息时，该测试方法适用于评估成品织物中的纱线。 5.4 从包装长度获得的纱线数不应与通过使用试验方法中包含的更精确的纱线数测定方法获得的值完全一致 907年 。但是，如果测试了足够数量的连续试样，则与测试方法的选项1基本一致 907年 可以预期。 5.5 本试验方法旨在测量作为合股纱组成部分的单纱的纱数，以及用于生产绉织物高捻纱的原单纱的纱线数。 5.6 由于所用长度较短，不建议采用该测试方法进行验收测试。在某些情况下，买方和供应商可能必须使用最佳可用方法测试一种或多种特定材料的商业装运，即使该方法未被推荐用于商业装运的验收测试。 5.6.1 在这种情况下，如果买方和供应商在使用该方法进行验收测试时报告的值存在差异，买方实验室和供应商实验室之间的对比应根据从评估类型的材料样本中随机抽取的测试样本确定。

1.1 This test method covers the determination of the yarn number of all types of cotton, woolen, worsted, and man-made fiber yarns taken from packages; or from any textile fabrics in which the yarns are intact and can be removed in measurable lengths. The test method is not applicable to yarns taken from napped or cut pile fabrics. Because this test method is based on short-length specimens, the results should only be considered as approximations of yarn number. Note 1: For a more precise procedure for the determination of yarn number, refer to Test Method D1907 . Note 2: The following additional methods for the determination of yarn number have been approved for yarns made from specific fibers: Specification D541 , D578 , and D681 . 1.2 This test method is applicable to yarns which stretch less than 5 % when tension on yarn is increased from 0.25 to 0.75 cN/tex (0.25 to 0.75 gf/tex). By mutual agreement it may be adapted to yarns which stretch more than 5 % by use of tension lower than that specified in the method for elastomers or use of tension higher than that specified in the method to pull the crimp out of textured yarns. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This is a quick method used for the determination of the approximate yarn number of short-length specimens taken from packages or fabrics. 5.2 Because any error present in the reported length of the specimen is multiplied many times when calculating the theoretical yarn number using Eq 2 or Eq 3 , it is extremely important that the length be measured as precisely as practicable. 5.3 For the analysis of fabrics, this test method is adequate for estimating the approximate yarn number of the yarn used to weave or knit the fabric, but the results obtained by this test method may not agree with the nominal yarn number of the yarns actually used to make the fabric because of the changes in the yarn number produced by the weaving or knitting operations, the finishing treatments, and the dissecting operations. This test method is suitable for the evaluation of yarns as they occur in the finished fabric, when that information is needed. 5.4 The yarn number obtained from the lengths taken from packages should not be expected to agree exactly with the values obtained by the use of the more precise methods of determining the yarn number included in Test Method D1907 . If a sufficient number of consecutive specimens were tested, however, a close agreement with Option 1 of Test Method D1907 can be expected. 5.5 This test method is designed to measure the yarn number of the single yarns present as a component of a plied yarn and the yarn number of the original single yarns used to produce a high twist yarn for a crepe fabric. 5.6 This test method is not recommended for acceptance testing because of the short lengths used. In some cases, the purchaser and the supplier may have to test a commercial shipment of one or more specific materials by the best available method, even though the method has not been recommended for acceptance testing of commercial shipments. 5.6.1 In such a case, if there is disagreement arising from the differences in values reported by the purchaser and supplier when using this method for acceptance testing, the statistical bias, if any, between the laboratory of the purchaser and the laboratory of the supplier should be determined with each comparison being based on testing specimens randomly drawn from one sample of material of the type being evaluated.