1.1 本试验方法包括通过测量纱线卷曲和纱线卷绕来确定织物长度和织物中纱线长度之间的关系。 1.2 本试验方法适用于机织物。 1.3 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。在文本中，英寸-磅单位显示在括号中。每个系统中规定的值不是精确的等价物；因此，每个系统应相互独立使用。合并两个系统的值可能会导致不符合规范。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、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《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 只有通过测量进入织机的纱线长度和由该特定长度的纱线制成的织物长度，才能准确地确定织物长度与织物中纱线长度的关系。然而，在大多数情况下，必须通过测量从测量的织物长度中去除的纱线长度来确定机织物，从而引入某些会影响测试准确性的变化。从机织物上取下的纱线包含织造过程中产生的波动或波浪。后续整理操作中的热量、水分和机械收缩可能会加剧这些波动，并且很可能会增加将其拉出并拉直纱线的力。为了在去除卷曲后准确测量纱线的长度，必须在不拉长纱线的情况下拉出这些波动。 在某些情况下，矫直纱线所需的最小力会导致一定量的伸长，从而增加纱线的长度。此外，在织造过程中施加在纱线上的应力可能足以使纱线拉伸超过其弹性极限，从而再次增加其长度。人们认识到，通过测量从测量长度的织物上取下的纱线长度进行的测定可能会得出卷曲值，该值略高于纱线在织物中的卷曲值。对于由具有不同收缩率的纱线制成的织物，或不同支数的纱线，或以不同张力编织的纱线，必须分别测定并报告织物中每种类型纱线的卷曲。 5.2 该测试方法可用于商业装运的验收测试，但应谨慎进行比较，因为有关估计的信息- 如中所述，实验室精度有限 13.1 . 5.2.1 如果两个实验室（或更多实验室）报告的测试结果之间存在实际意义上的差异，则应进行比较测试，以确定它们之间是否存在统计偏差，并使用适当的统计辅助。至少应确保使用的测试样品尽可能均匀，从获得不同测试结果的材料中提取，并以相同数量随机分配给每个实验室进行测试。应使用未配对数据的统计测试，在测试系列之前选择的概率水平上，比较两个实验室的测试结果。如果发现偏差，必须找到并纠正其原因，或者考虑到已知偏差，必须调整该材料的未来测试结果。

1.1 This test method covers the determination of the relationship between the length of a piece of fabric and the length of the yarn in the fabric by measurement of the yarn crimp and yarn take-up. 1.2 This test method applies to woven fabrics. 1.3 The values stated in either SI or inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. 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 The relationship of the length of a piece of fabric and the length of yarn in the fabric can be determined accurately only be measuring the length of yarn entering the loom and the length of fabric made from that particular length of yarn. In most cases, however, the determination must of necessity be made on a woven fabric by measuring the length of yarn removed from a measured length of fabric, thus introducing certain variations that will influence the accuracy of the test. Yarn removed from the woven fabric contains undulations or waves that have been introduced by the weaving process. Heat, moisture, and mechanical shrinkage on subsequent finishing operations may accentuate these undulations, and in all probability, increase the force to pull them out and straighten the yarn. In order to accurately measure the length of the yarn after the removal of the crimp, these undulations must be pulled out without elongating the yarn. In some cases, the minimum force necessary to straighten the yarn will cause a certain amount of the elongation to take place, thus increasing the length of the yarn. Also, stresses imposed upon the yarn during the weaving process may have been sufficient to stretch the yarn beyond its elastic limit, again increasing its length. It is recognized that determination made by measuring length of yarn removed from a measured length of fabric may tend to give crimp values that are somewhat higher than the crimp in the yarn as it lay in the fabric. In the case of fabrics made from yarns that exhibit differential shrinkage, or yarns of widely different count, or yarns woven at different tensions, the crimp of each type of yarn in the fabric must be determined and reported separately. 5.2 This test method can be used for acceptance testing of commercial shipments but comparisons should be made with caution because information on estimates of between-laboratory precision is limited as noted in 13.1 . 5.2.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if their is a statistical bias between them, using competent statistical assistance. As a minimum, ensure the test samples to be used are as homogeneous as possible, are drawn from the material from which the disparate test results were obtained, and are randomly assigned in equal numbers to each laboratory for testing. The test results from the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If a bias is found, either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.