1.1 本试验方法包括测量由于暴露于湿热或干热引起的卷曲特性变化而引起的变形纱张紧骨架长度的变化。长度的变化取决于程序，是衡量绞纱收缩、卷曲收缩、体积收缩或卷曲回复的指标。 1.2 本试验方法适用于1.7至88.9 tex（15至800旦）的卷曲连续复丝纱线。 1.3 为卷曲展开介质提供了三种条件，并提供了在纱线骨架上使用的加载程序，以便通过几个不同的程序确定纱线体积。 1.4 以国际单位制或英寸表示的数值- 磅单位应视为标准单位。在文本中，英寸-磅单位显示在括号中。每个系统中规定的值并不完全相等；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。 1.5 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。 1.6 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 通过本试验方法获得的值不应用于预测制造结构中的类似性能，除非在狭义明确的比较中，例如来自同一喂入纱的16.7 tex（150 denier）聚酯在同一机器类型上合并和变形。将纱线性能与织物性能联系起来的尝试可能会导致相关性较差，除非消除其他影响体积的因素，如纱线收缩和织物整理。 5.2 处理和测试之间的经过时间对该测试的结果有显著影响，尤其是在前72小时内。因此，只有在相同的经过时间后进行测试时，才应比较样本。 这种影响是由应力衰减引起的，已知应力衰减在第七天之后最小，之后样品保持相对稳定。比较最好在第七天之后进行。 5.3 如果纱线的线密度接近指定的绞纱尺寸上限 表3 ，四舍五入到整圈时会引入误差。因此，卷曲收缩等的计算值只能与相同线密度的其他纱线样品进行比较。 （A） 看见 公式2 和 注1 . （B） 100转，绞纱线密度变化。 5.4 选项A与卷曲展开条件1（120°C（248°F）下的干热烘箱）和0的轻负载一起使用。 对于变形聚酯纱线，建议使用0.4 mN/tex（0.5 mgf/den）和0.44 mN/tex（5.0 mgf/den）。可以计算所有卷曲参数。 5.5 选项B也可用于变形聚酯纱线的卷曲展开条件1（干热）。可以计算卷曲收缩。当用于复制或使用合适的机械纱线处理装置时， 3. 备用绞纱尺寸和重量可按中所述使用 6.5.2 和 9.3.2 . 5.6 建议将选项C与卷曲展开条件2（82°C（180°F）下的水浴）和0.13 mN/tex（1.5 mgf/den）的轻负荷一起用于变形尼龙纱。对于变形聚酯纱线，建议采用条件3（97°C（206°F）水浴）。 仅计算体积收缩。 5.7 由于缺乏精确数据，不建议将这种测量散装特性的测试方法用于商业装运的验收测试。 5.7.1 如果两个实验室（或更多实验室）的报告测试结果之间存在差异或实际意义，则应进行比较测试，以确定它们之间是否存在统计偏差，并使用适当的统计协助。至少，从获得不同测试结果的材料中提取尽可能均匀的测试样本，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 measurement of the change in length of a tensioned skein of textured yarn due to change in crimp characteristics brought about by exposure to wet or dry heat. The change in length, depending on procedure, is a measure of skein shrinkage, crimp contraction, bulk shrinkage, or crimp recovery. 1.2 This test method applies to crimped, continuous multifilament yarns ranging from 1.7 to 88.9 tex (15 to 800 denier). 1.3 Three conditions are provided for crimp development mediums, and loading routines are provided to be used on the yarn skeins to allow determination of yarn bulk by several different procedures. 1.4 The values stated in either SI units or inch-pound units are to be regarded as standard. Within the text, the inch-pound units are shown in parentheses. The values stated in each system are not exact equivalent; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the specification. 1.5 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. 1.6 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 values obtained by this test method should not be used to predict similar properties in fabricated structures except in narrow well-defined comparisons, such as 16.7 tex (150-denier) polyester from the same feed yarn merge and textured on the same machine type. Attempts to relate yarn performance to fabric performance might result in poor correlations unless other factors affecting bulk such as yarn shrinkage and fabric finishing are eliminated. 5.2 Elapsed time between processing and testing has a marked effect on the results of this test especially during the first 72 h. Therefore, specimens should only be compared if tested after the same elapsed time. This effect is caused by stress decay which is known to be minimal beyond the seventh day and after which time the sample remains relatively stable. Comparisons are preferably made after the seventh day. 5.3 In the case of yarns having a linear density near the upper limit of the skein size directed in Table 3 , an error is introduced when rounding off to full revolutions. Therefore, the calculated values for crimp contraction, etc., should only be compared with other samples of yarn of the same linear density. (A) See Eq 2 , and Note 1 . (B) 100 Revolutions, linear density of skein varies. 5.4 Option A used with crimp development Condition 1 (dry heat oven at 120°C (248°F)) and light loads of 0.04 mN/tex (0.5 mgf/den) and 0.44 mN/tex (5.0 mgf/den) are recommended for textured polyester yarns. All crimp parameters may be calculated. 5.5 Option B may also be used with crimp development Condition 1 (dry heat) for textured polyester yarns. Crimp contraction may be calculated. When used to duplicate or to utilize suitable mechanical yarn handling devices, 3 alternate skein size and weights may be used as described in 6.5.2 and 9.3.2 . 5.6 Option C used with crimp development Condition 2 (water bath at 82°C (180°F)) and a light load of 0.13 mN/tex (1.5 mgf/den) is recommended for textured nylon yarns. For textured polyester yarns, Condition 3 (water bath at 97°C (206°F)) is recommended. Only bulk shrinkage is calculated. 5.7 This test method for the measurement of bulk properties is not recommended for acceptance testing of commercial shipments because of lack of precision data. 5.7.1 If there are differences or practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, test samples that are as homogeneous as possible, drawn from the material from which the disparate test results were obtained, and 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.