1.1 本试验方法包括在恒定拉伸速率（CRE）型拉伸试验机上进行试验时，测量由天然或人造弹性体单独或与其他纺织纱线组合制成的宽或窄弹性织物的张力和伸长率。 注1: 关于使用恒定负载率（CRL）型拉伸试验机确定类似试验，请参阅试验方法 D1775 . 1.2 使用本试验方法时，需要选择或相互同意将确定试验结果的环张力和伸长率。 1.3 洗涤程序要求双方就所用洗涤周期和干燥周期的温度和数量的选择达成一致。 1.4 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可能不是精确的等效值；因此，每个系统必须相互独立使用，不得以任何方式组合值。 1.5 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。 1.6 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 这种测试弹性织物的线圈张力和伸长率的测试方法被认为适合于弹性织物商业装运的验收测试，因为该测试方法在贸易中用于验收测试。 5.1.1 如果在使用本测试方法进行商业装运验收测试时，由于报告测试结果的差异而产生争议，双方应进行比较测试，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 本试验方法规定了CRE型拉伸试验机的使用。本试验方法的用户应注意，使用本方法获得的回路张力试验数据与使用本试验方法获得的张力试验数据不具有可比性 D1775 因为试验机的不同。试验方法 D1775 使用CRL型拉伸试验机。 5.3 弹性织物的环张力和延伸关系是判断织物是否适合各种最终用途的重要标准，例如:基础服装、胸罩和泳衣。 5.4 只有当张力试验机、拉伸速率、最大载荷（或拉伸）和试样规格具有可比性时，才能比较回路张力恢复曲线的数据。由于机组不同- ups会在同一织物上产生不同的结果，在进行测试之前，必须始终指定机器设置，并随测试结果一起报告。 5.5 在规定伸长率下测量线圈张力的试验用于确定弹性织物在规定伸长率小于织物断裂所需伸长率时的张力。该测试仅规定了延长（输出）周期的测量点。 5.6 在规定张力下测量伸长率的试验用于确定弹性织物在承受低于织物断裂所需张力的规定环张力时的伸长率。 该测试仅规定了加载（输出）循环的测量点。

1.1 This test method covers the measurement of tension and elongation of wide or narrow elastic fabrics made from natural or man-made elastomers, either alone or in combination with other textile yarns, when tested with a constant-rate-of-extension (CRE) type tensile testing machine. Note 1: For determination of similar testing using the constant-rate-of-load (CRL) type tensile testing machine, refer to Test Method D1775 . 1.2 The use of this test method requires the selection of, or mutual agreement upon, loop tension(s) and elongation(s) at which the test results will be determined. 1.3 Laundering procedures require mutual agreement on the selection of temperature and number of washing cycles and drying cycles to be used. 1.4 The values stated in SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore each system must be used independently of the other, without combining values in any way. 1.5 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. 1.6 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 loop tension and elongation of elastic fabrics is considered satisfactory for acceptance testing of commercial shipments of elastic fabrics because the test method is used in the trade for acceptance testing. 5.1.1 In case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the parties 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 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 specifies the use of the CRE-type tensile testing machine. Users of this test method are cautioned that loop tension test data obtained using this method are not comparable to tension test data obtained using Test Method D1775 because of the differences in testing machines. Test Method D1775 uses a CRL-type tensile testing machine. 5.3 The loop tension and extension relationship of an elastic fabric is an important criterion for judging the suitability of the fabric for various end uses, such as: foundation garments, brassieres, and swimsuits. 5.4 Data from loop tension-recovery curves can be compared only if the tension testing machine, rate-of-extension, maximum loading (or extension), and specimen specifications are comparable. Since different machine set-ups will cause different results on the same fabric, machine set-ups must always be specified before making a test and be reported with the test results. 5.5 The test for measuring loop tension at specified elongation(s) is used to determine the tension of an elastic fabric when subjected to a specified elongation which is less than the elongation required to rupture the fabric. The test prescribes points of measurement on the extending (outgoing) cycle only. 5.6 The test for measuring elongation at specified tension(s) is used to determine the elongation of an elastic fabric when subjected to a specified loop tension which is less than the tension required to rupture the fabric. The test prescribes points of measurement on the loading (outgoing) cycle only.