1.1 本试验方法涵盖拉伸包装膜的拉伸恢复、永久变形和应力保持的测量。 1.2 包括几个扩展级别，以确定小扩展和大扩展的效果。 1.3 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 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 弹性回复与包装在使用周期内膨胀后恢复其原始形状的能力有关。 5.2 弹性回复也与包装的紧密性或紧密性有关。 5.3 应力保持与包装的紧密性或紧密性有关。

1.1 This test method covers the measurement of recovery from extension, permanent deformation, and stress retention of stretch wrap film. 1.2 Several levels of extension are included to ascertain the effect of both small and large extensions. 1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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. 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 Elastic recovery is related to the ability of a package to resume its original shape after being distended during its use cycle. 5.2 Elastic recovery also relates to the tightness or snugness of a package. 5.3 Stress retention is related to the tightness or snugness of a package.