1.1 本试验方法包括单纱外观分级。 1.2 本试验方法不适用于合股纱。 1.3 以英寸磅或国际单位制表示的数值应单独视为标准。每个系统中规定的值并不完全相等，因此，每个系统必须独立使用。将两个系统的值合并可能导致不符合标准。 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）。 本标准的使用者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。 2. 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 6.1 这种方法被认为是令人满意的商业货物验收分级方法，因为它在贸易中已被广泛用于此目的。 6.1.1 如果两个实验室（或多个实验室）报告的测试结果之间存在实际意义上的差异，则应使用主管统计协助进行比较测试，以确定它们之间是否存在统计偏差。作为最低要求，使用尽可能均匀的样本进行比较测试，这些样本与在初始测试期间产生不同结果的样本来自同一批次的材料，并以相同数量随机分配给每个实验室。 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，或者必须在考虑已知偏差的情况下调整该材料的未来测试结果。 6.2 机织或针织织物的外观在很大程度上取决于制造织物的纱线的光滑度、清洁度和总体外观。 仪器可用于测量不均匀性和计算纱线中的棉结和其他缺陷，但从这些测试中获得的值不容易集成到实际织物外观的总体表达式中。纱线外观分级提供了额外的信息，编织或针织产品的制造商可以通过经验将这些信息与由纱线制成的织物的预期外观相关联。

1.1 This test method covers the grading of singles spun yarns for appearance. 1.2 This test method does not apply to plied yarns. 1.3 The values stated in either inch-pound or SI units are to be regarded separately as the standard. The values stated in each system are not exact equivalents, therefore, each system must be used independently of the other. Combining values from the two systems may result in non-conformance with the 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. 2 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 ====== 6.1 This method is considered satisfactory for acceptance grading of commercial shipments because it has been used extensively in the trade for this purpose. 6.1.1 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. 6.2 The appearance of a woven or knitted fabric depends to a large extent on the smoothness, cleanliness, and general appearance of the yarns from which the fabric is manufactured. Instruments are available for the measurement of unevenness and for counting neps and other imperfections in yarn, but the values obtained from such tests are not easily integrated into an over-all expression for actual fabric appearance. Yarn appearance grading affords additional information which the manufacturer of woven or knitted goods may, through experience, correlate with the appearance to be expected in fabrics made from the yarns.