1.1 本试验方法包括测定人造短纤维样品中超长或超长纤维的数量百分比。该方法适用于制造后立即从捆包或部分加工的原料中提取的纤维。 注1: 关于人造短纤维的长度和长度分布的测量，请参考试验方法 D5103 . 1.2 本测试方法涵盖了使用335A型Fibrosampler（英寸-磅单位）、335B型FibrosSampler（国际单位制）和336型Fibros采样器梳子的程序。 1.2.1 335A型Fibrosampler配备了一个15英寸的样品板。 8毫米( 5. / 8. -in）直径样品孔，建议用于从纤维搅拌机或梳理机中取出的混合短纤维。 1.2.2 335B型Fibrosampler配备了一个直径为10毫米（0.4英寸）的样品板，建议用于从纤维切割器或一捆短纤维中取出的未混合短纤维。 1.3 以国际单位制或英寸-磅单位表示的值应单独视为标准。每个单位中所述的值不是完全等效的；因此，每个单元都必须独立使用。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、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====== 5.1 人造短纤维中超长纤维的存在会在将这些纤维纺成纱线时造成严重问题。超长纤维可能会在梳理过程中产生问题，但更特别的是，高强度多切纤维可能会导致纺纱时起皱。 5.2 由于超长纤维是由钝或损坏的切割刀或丝束向短纤维切割器的不均匀流动引起的，因此它们在纤维群体中的存在是不均匀的，它们在群体中的出现遵循高度偏斜的分布。 5.3 手动确定超长光纤的方法需要更多的操作员时间，实验室和操作员之间的测试标准偏差很高。 使用Fibrosampler方法大大减少了操作员的时间和测试的标准偏差。 5.4 在制造过程中，重要的是要知道纤维是由于丝束的缠绕而超长，还是由于刀具损坏而超长。 5.5 不建议将这种测试超长短纤维的方法用于验收测试（见 13.1 ). 5.5.1 在某些情况下，买方和供应商可能必须采用最佳可用方法对一种或多种特定材料的商业装运进行测试，即使该方法尚未被推荐用于商业装运的验收测试。 如果两个（或多个）实验室报告的测试结果之间存在实际意义的差异，应使用合格的统计辅助进行比较测试，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品进行比较测试，这些样品与在初始测试中产生不同结果的样品来自同一批材料，并随机分配给每个实验室。应使用未配对数据的统计检验来比较相关实验室的测试结果，这是在测试系列之前选择的概率水平。 如果发现偏差，则必须找到并纠正其原因，或者必须根据已知的偏差调整该材料的未来测试结果。

1.1 This test method covers the determination of the percent by number of overlength or multiple length fibers in a sample of manufactured cut staple. The method is applicable to fiber taken immediately after manufacturing, from the bale, or from partially processed stock. Note 1: For measurement of length and length distribution of manufactured staple fibers, refer to Test Method D5103 . 1.2 This test method covers procedures using the Fibrosampler Model 335A (inch-pound units), the Fibrosampler Model 335B (SI units), and Fibrosampler combs Model 336. 1.2.1 The Fibrosampler Model 335A is equipped with a sample plate that has 15.8-mm ( 5 / 8 -in.) diameter sample holes and is recommended for use on blended staple taken from the fiber blender or from a carding machine. 1.2.2 The Fibrosampler Model 335B is equipped with a sample plate that has 10-mm (0.4-in.) diameter sample holes and is recommended for use on unblended staple as may be taken from the fiber cutter or from a bale of staple fiber. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as the standard. The values stated in each unit are not exact equivalents; therefore, each unit must be used independently of the other. 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 The existence of overlength fiber in manufactured staple can cause serious problems in the spinning of these fibers into yarn. Overlength fibers may create problems in carding, but more especially high-strength multiple cut fibers may cause cockling in spinning. 5.2 Since the overlength fibers are caused by dull or damaged cutting knives or by uneven flow of tow to the staple cutter, their existence within the fiber population is not uniform and their occurrence in the population follows a highly skewed distribution. 5.3 Manual methods of determining overlength fiber require much more operator time, and the standard deviations of the test between laboratories and operators are high. Use of the Fibrosampler method greatly reduces both operator time and standard deviation of testing. 5.4 In manufacturing it is important to know if fibers are overlength due to looping of the tow or multiple length due to damaged cutters. 5.5 This method for testing staple fiber for overlength fiber is not recommended for acceptance testing (see 13.1 ). 5.5.1 In some cases the purchaser and the 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. If there are differences of practical significance between reported test results for two laboratories (or more), comparative test 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.