1.1 本试验方法涵盖了使用自动测试仪测定所有类型长丝纱线（部分取向纱（POY）、全取向纱（FOY）、扁平纱、变形和膨体连续长丝（BCF）地毯纱）的卷曲收缩、残余纤维收缩及其可变性。 注1: 关于测试变形纱卷曲的另一种方法，请参阅测试方法 D4031 . 1.1.1 这种方法也可用于非变形纱。 1.2 本试验方法仅限于22.0 dtex至890 dtex（15旦至800旦）的卷曲多丝纱线，以及890 dtex至4200 dtex（800旦至3800旦）的BCF纱线。 1.3 以国际单位制表示的数值应视为标准值。国际单位制后括号内的英寸-磅单位仅供参考，不被视为标准单位。 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 试验方法 D6774 ，用于测定变形长丝纱线中的最大总收缩、卷曲和残余纤维收缩，适用于商业装运的验收测试。 5.1.1 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，并使用适当的统计协助。作为最低要求，使用尽可能同质的样品进行比较试验，从与初始试验期间产生不同结果的样品相同批次的材料中提取，并随机等份分配给每个实验室。应使用未配对数据的统计测试对相关实验室的测试结果进行比较，这是在测试系列之前选择的概率水平。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。 5.2 用这种方法测量的性能及其变化性与织物的整体外观、拉伸和回复以及纱线的可染性有关。 5.3 对于某些纱线，加工和测试之间的时间对该测试的结果有显著影响，尤其是在前72小时。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，之后纱线保持相对稳定。因此，只有在经过相同时间后进行测试时，才应比较样本。样品可以在线测试，因此在处理和测试之间几乎没有经过的时间。

1.1 This test method covers the determination of crimp contraction, residual fiber shrinkage and their variability of all types of filament yarns (partially oriented yarn (POY), fully oriented yarn (FOY), flat yarns, textured and bulked continuous filament (BCF) carpet yarns) using an automated tester. Note 1: For another method of testing crimp in textured yarns, refer to Test Method D4031 . 1.1.1 This method may also be used for non-textured yarns. 1.2 This test method is limited to crimped, multi-filament yarns ranging from 22.0 dtex to 890 dtex (15 denier to 800 denier) and for BCF yarns from 890 dtex to 4200 dtex (800 denier to 3800 denier). 1.3 The values stated in SI units are to be regarded as standard. Inch-pound units 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 Test Method D6774 , for determining maximum total contraction, crimp, and residual fiber shrinkage in textured filament yarns is suitable for acceptance testing of commercial shipments. 5.1.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, use the samples for such a comparative tests that are as homogeneous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing and randomly assigned in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, 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. 5.2 The properties and their variability as measured by this method relate to bulk appearance, stretch and recovery of fabrics and dyeability of yarns. 5.3 For some yarns, elapsed time between processing and testing has a marked effect on the results, of this test, especially during the first 72 h. The effect is caused by stress decay which is known to be minimal beyond the seventh day and after which time the yarn remains relatively stable. Therefore, specimens should only be compared if tested after the same elapsed time. Samples can be tested at-line, thus having little to no elapsed time between processing and testing.