1.1 本试验方法包括测量与固体材料接触的移动纱线的动态摩擦特性。 注1: 关于测定纱线之间的摩擦力，请参阅测试方法 D3412 . 1.2 本试验方法规定了100 m/min的相对速度。该试验方法可在其他速度下使用，但精度和摩擦系数可能会发生变化。 1.3 本试验方法包括测量纱线与固体表面或接触区域内恒定半径表面之间的动摩擦系数。如果使用均匀值的纱线，可以比较不同固体材料与该纱线的摩擦性能。如果使用给定的固体材料，可以比较不同纱线或具有不同整理剂的纱线与该特定固体材料的摩擦性能。 1.4 本试验方法特别推荐1.57、3.14和6.28弧度（90、180和360°）的包角，但也可以使用其他包角，精度和水平可能会发生变化。缠绕角度不应太大，尤其是对于摩擦系数高的纱线，否则会导致输出张力超过被测纱线的屈服值。此外，在每种情况下，包角不应小于1.57 rad（90°）。 1.5 本试验方法适用于线密度在1.5至400 tex[14至3600 denier]之间、摩擦系数在0.1至1.0之间的纱线，但也可用于线密度和摩擦系数范围以外的纱线。 1.6 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。 每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.7 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。 第节给出了具体的预防说明 7. . 1.8 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 D3108 为了测定纱线和固体材料之间的动摩擦，可将其用于商业运输纱线的验收测试，但建议谨慎，因为已知实验室之间的精度较差。按照中的指示进行比较测试 5.1.1 可能是可取的。 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同质的测试样本，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。 5.2 纺织纱线和机械部件（如导纱器）的摩擦性能是人们普遍感兴趣的，并有许多应用。由于纱线的摩擦性能会影响导纱器、缝纫针和针织针以及其他接触表面的性能和寿命，因此表面光洁度和润滑剂的改性效果特别重要。摩擦性能也会影响纱线的质量和性能，进而影响由纱线制成的产品的质量和性能。因此，摩擦特性在研究、控制和产品设计中具有重要意义。 5.3 需要强调的是，对于单个物体，例如纱线或表面，不存在摩擦系数。 摩擦系数测量两个物体或元件之间的相互作用，例如在表面上运行的纱线。 5.4 虽然该方法规定了标准化的测试条件，但非标准条件可用于研究或诊断，但应按此报告。 5.5 该方法包括测定指定长度纱线上的平均摩擦力。 5.6 文献中报告了其他信息。 3. , 4. , 5.

1.1 This test method covers the measurement of the kinetic frictional properties of a moving yarn in contact with a solid material. Note 1: For determining yarn-to-yarn friction, refer to Test Method D3412 . 1.2 This test method specifies a relative speed of 100 m/min. The test method may be used at other speeds, although with a possible change in precision and coefficient of friction. 1.3 This test method covers the measurement of the coefficient of kinetic friction between yarn and solid surface or surfaces of constant radius in the contact area. If a yarn of uniform value is used, comparisons of frictional properties of different solid materials can be made with relation to that yarn. If a given solid material is used, comparisons of frictional properties of different yarns, or yarns with different finishes, can be made with relation to that particular solid material. 1.4 This test method specifically recommends wrap angles of 1.57, 3.14 and 6.28 radian (90, 180 and 360°), but other wrap angles may be used, again with a possible change in precision and level. The angle of wrap should not be so great, especially for yarns having high coefficients of friction, that it causes the output tension to exceed the yield value for the yarn being tested. Also, in every case the angle of wrap should not be less than 1.57 rad (90°). 1.5 This test method has been applied to yarns having linear densities ranging between 1.5 and 400 tex [14 and 3600 denier] and having coefficients of friction ranging between 0.1 and 1.0 but may also be used with yarns outside these ranges of linear densities and coefficients of friction. 1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.7 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. Specific precautionary statements are given in Section 7 . 1.8 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 D3108 for the determination of kinetic friction between yarn and solid materials may be used for the acceptance testing of commercial shipments of yarn, but caution is advised since between laboratory precision is known to be poor. Comparative tests as directed in 5.1.1 may be advisable. 5.1.1 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 homogenous 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. 5.2 The frictional properties of textile yarns and of machinery components such as yarn guides are of general interest and have many applications. Because the frictional properties of yarns will affect the performance and life of yarn guides, sewing and knitting needles, and other contact surfaces, the modifying effects of surface finishes and lubricants are of special interest. Frictional properties also affect the quality and performance properties of yarns and subsequently of products made from them. As a consequence, frictional properties are of interest in research, control, and product design. 5.3 It is stressed that there is no coefficient of friction for a single body such as a yarn or a surface. A coefficient of friction measures the interaction between two bodies or elements such as a yarn running over a surface. 5.4 Although this method lays down standardized conditions of test, nonstandard conditions may be used for research or diagnosis but should be reported as such. 5.5 This method covers determination of the mean friction over a specified length of yarn. 5.6 Additional information has been reported in the literature. 3 , 4 , 5