1.1 本试验方法包括在边界摩擦条件下测量连续长丝和短纤纱的摩擦性能。 1.2 本试验方法已用于线密度在1.5至400 tex之间的纱线，但也可用于线密度在这些范围之外的纱线[15至3600 denier]。 注1: 有关纱线与金属之间的摩擦系数，请参阅测试方法 D3108/D3108M . 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。 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。 1.4 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 这种测试纱线之间摩擦的测试方法正在用于但不推荐用于商业装运的验收测试，因为- 众所周知，实验室精度较差。 5.1.1 在某些情况下，买方和供应商可能必须使用最佳可用方法测试一个或多个特定材料的商业装运，即使该方法未被推荐用于商业装运的验收测试。如果因使用测试方法时报告的测试结果的差异而产生争议 D3412/D3412M 对于商业装运的验收测试，买方和供应商应进行比较测试，以确定其实验室之间是否存在统计偏差。 建议为调查偏差提供称职的统计协助。作为最低要求，双方应尽可能均匀地从大量相关类型的材料中选取一组试样。然后，应将试样以相同数量随机分配给每个实验室进行测试。两个实验室的平均结果应使用学生的 t -测试未配对数据和双方在测试开始前选择的可接受概率水平。 如果发现偏差，必须找到并纠正其原因，或者买方和供应商必须同意在考虑已知偏差的情况下解释未来的测试结果。 5.2 本试验方法旨在测定在指定纱线长度上测得的纱线与纱线之间的边界摩擦系数。 5.3 该测试方法有助于纱线边界润滑剂的质量控制、研究和表征。 注3: 由于纱线的几何形状不同，选项1和2不应在同一纱线上给出相同的数值。

1.1 This test method covers the measurement of frictional properties for both continuous filament and spun-staple yarns under boundary friction conditions. 1.2 This test method has been used with yarns having linear densities ranging from 1.5 to 400 tex, but may be used with yarns outside these ranges [15 to 3600 denier]. Note 1: For coefficient of friction, yarn to metal, see Test Method D3108/D3108M . 1.3 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. 1.4 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 This test method for testing yarn-to-yarn friction is being used, but is not recommended, for acceptance testing of commercial shipments since between-laboratory precision is known to be poor. 5.1.1 In some cases, the purchaser and supplier may have to test a commercial shipment of one or more specific materials by the best available method even though the method has not been recommended for acceptance testing of commercial shipments. In case of a dispute arising from differences in reported test results when using Test Method D3412/D3412M for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Student's t -test for unpaired data and an acceptable probability level chosen by the two parties before the testing is begun. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results with consideration to the known bias. 5.2 This test method is intended for the determination of yarn-to-yarn boundary friction coefficients measured over a specified length of yarn. 5.3 The test method is useful for quality control, research, and the characterization of yarn boundary lubricants. Note 3: Because the geometry of the yarns is different, Options 1 and 2 should not be expected to give the same numerical values on the same yarns.