1.1 本试验方法用于测定当在沸水、干热、饱和蒸汽或溶剂中处理时，绞纱形式的纱线的收缩率。本试验方法适用于由任何纤维或纤维组合制成的纱线，其中纱线的tex已知或可以确定。不建议将本试验方法用于弹性纱线和拉伸超过5的纱线 % 在规定的拉伸载荷下，尽管它已用于后者。 注1: 测试方法涵盖了测定变形纱的纱线收缩率和体积特性的程序 D4031 . 1.2 该测试方法以国际单位制和英寸磅为单位显示数值。“SI”单位在技术上是公制单位的正确名称，称为国际单位制。 “英寸-磅”单位是美国常用单位的技术正确名称。以国际单位或其他单位表示的数值应视为标准值。每个系统中表示的值可能不是精确的等价物；因此，每个系统必须相互独立使用，不得以任何方式组合。 1.3 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。 1.4 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 D2259 为了测试纱线在沸水中的收缩率，饱和蒸汽、干热或溶剂被视为符合商业运输纱线验收测试的要求，因为该测试方法已在贸易中广泛用于该目的。 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 通过本试验方法获得的结果可用于以下目的: 5.2.1 作为预测织物湿加工尺寸稳定性的辅助工具， 5.2.2 作为预测高温加工期间织物尺寸稳定性的辅助工具，以及 5.2.3 作为某些类型纤维制造中的控制措施。 5.3 试验中使用的收缩介质取决于相关方的要求。 5.4 沸水中的收缩过程在第节中描述 12 ，用于截面干热收缩 13 ，用于截面中饱和蒸汽的收缩 14 ，以及第节中的溶剂收缩 15 . 沸水的暴露时间规定为30分钟。在暴露于干热、饱和蒸汽或溶剂时，纱线长度的变化程度取决于纤维类型以及暴露的时间和温度。纤维类型对高温的反应以及特定溶剂的性质不同，先前的纤维历史对纱线的热收缩和溶剂收缩有很大影响。因此，必须就所涉及的特定产品商定用于确定干热或饱和蒸汽收缩率的时间和温度条件。 此外，对于所涉及的特定产品的溶剂收缩率测定，必须就时间和温度条件以及使用的溶剂达成一致。

1.1 This test method is used to determine the shrinkage of yarns in skein form when treated in boiling water, dry heat, saturated steam, or solvents. This test method is applicable to yarns made from any fiber or combination of fibers where the tex of the yarn is known or can be determined. This test method is not recommended for elastomeric yarns and those yarns that stretch more than 5 % under the tension loadings prescribed, although it has been used for the latter. Note 1: Procedures for determining yarn shrinkage and bulk properties of textured yarns are covered in Test Method D4031 . 1.2 This test method shows the values in both SI and inch-pound units. “SI” units is the technically correct name for the system of metric units known as the International System of Units. “Inch-pound” units is the technically correct name for the customary units used in the United States. The values stated in either SI units or in other units shall be regarded as standard. The values expressed in each system may not be exact equivalents; therefore each system must be used independently of the other without combining in any way. 1.3 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. 1.4 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 D2259 for testing yarn for shrinkage in boiling water, saturated steam, dry heat, or solvents is considered satisfactory for acceptance testing of commercial shipments of yarn because the test method has been used extensively in the trade for that purpose. 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 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 Results obtained by this test method can be used for the following purposes: 5.2.1 As an aid in predicting the dimensional stability of fabrics to wet processing, 5.2.2 As an aid in predicting the dimensional stability of fabrics during processing at elevated temperatures, and 5.2.3 As a control measure in the manufacture of some types of fibers. 5.3 The shrinkage medium to be used in the test depends on the requirements of the parties involved. 5.4 The procedure for shrinkage in boiling water is described in Section 12 , for shrinkage in dry heat in Section 13 , for shrinkage in saturated steam in Section 14 , and for shrinkage in solvents in Section 15 . A 30-min exposure time is prescribed for boiling water. In exposure to dry heat, saturated steam, or solvents, the extent of change in the length of yarn is dependent upon the fiber type and upon the time and temperature of the exposure. Fiber types differ in their reaction to elevated temperature as well as the nature of the specific solvent, and prior fiber history can have a great influence upon the heat and solvent shrinkage of a yarn. Therefore, the time and temperature conditions to be used to determine dry heat or saturated steam shrinkage must be agreed upon for the particular product involved. In addition, time and temperature conditions, and solvent to be used must be agreed upon for solvent shrinkage determination for the particular product involved.