1.1 本标准方法描述了可用于检测尺寸范围为1 mm的密封缺陷的技术和测试程序，并使用机载超声技术表征各种包装风格中的密封质量。 1.2 本试验方法并非测量密封质量的唯一方法。 1.3 可以在柔性、半刚性和刚性包装中测试热密封和其他包装组件。在该方法中包含的最新ILS中，仅评估了柔性包装密封件的精度和偏差。需要单独确定任何特定包装的精度和偏差。 1.4 特别是在L扫描模式下，可以考虑对密封件进行在线实时检查。 1.5 该方法提供了一种无损、定量、非主观的软包装密封检查方法。 1.6 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.7 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。 1.8 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 该方法允许通过将超声波信号通过包装或物品的密封区域来评估密封质量。密封不良的区域传输的超声波能量不如密封良好的区域多。 5.2 该方法依赖于超声信号强度的定量分析，提供了一种非负反馈信号- 评估包装密封质量和检测缺陷的主观方法。 5.3 该技术已用于检查各种材料，包括软袋密封件、刚性托盘密封件和其他包装部件，如固定阀。任何特定包装和密封配置的精度和偏差都需要单独确定和验证。 5.4 C扫描方法适用于实验室应用或离线密封检查。L扫描方法可用于密封质量的在线实时检查。任何一种方法检测给定缺陷大小和严重程度的灵敏度都需要单独确定。 5.5 声波在不同的材料中以不同的速度传播，通常在密度更大的材料中传播得更快。声阻抗（表示为g/cm 2. ·μs）是密度（g/cm）的乘积 3. )和速度（厘米/μs）。特别重要的是空气阻抗和任何固体材料阻抗之间的极端差异。 可以很容易地检测到任何间隙或粘合不良的区域。 布料 速度 （厘米/微秒） 密集 （克/厘米 3. ) 声学的 阻抗 （克/厘米 2. -μ秒） 空气（20°C，1巴） 0.0344 0.00119 0.000041 水（20°C） 0.148 1 0.148 聚乙烯 0.267 1.1 0.294 铝 0.632 2.7 1.710

1.1 This standard method describes the technology and testing procedures that can be used to detect seal defects in the size range of 1 mm and characterize seal quality in a variety of packaging styles using airborne ultrasound technology. 1.2 This test method does not purport to be the only method for measurement of seal quality. 1.3 Heat seals and other package components can be tested in flexible, semi-rigid and rigid packages. Only the precision and bias for flexible package seals were evaluated in a recent ILS included in the method. The precision and bias for any specific package needs to be individually determined. 1.4 On-line, real time inspection of seals can be considered particularly in the L-Scan mode. 1.5 This method provides a non-destructive, quantitative, non-subjective approach to flexible package seal inspection. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 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. 1.8 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 method allows for the evaluation of seal quality by passing an ultrasound signal through the sealed area of a package or item. Poorly sealed areas will not transmit as much ultrasonic energy as properly sealed areas. 5.2 This method relies on quantitative analysis of ultrasound signal strength, providing a non-subjective approach to assessing package seal quality and detecting defects. 5.3 This technique has been used for inspecting a variety of materials including flexible pouch seals, rigid tray seals and other packaging components such as affixed valves. The precision and bias for any specific package and seal configuration needs to be individually determined and validated. 5.4 The C-Scan approach is useful for laboratory applications or off-line seal inspection. The L-Scan approach can be used for on-line, real time inspection of seal quality. The sensitivity of either approach to detect a given defect size and level of severity needs to be individually determined. 5.5 Sound waves propagate at different speeds through different materials generally moving faster through more dense materials. The acoustic impedance (expressed as g/cm 2 ·μs) is the product of density (g/cm 3 ) and velocity (cm/μs). Of particular importance is the extreme difference between the impedance of air and that of any solid material. Any gap or poorly bonded area can be readily detected. Material Velocity (cm/μsec) Density (g/cm 3 ) Acoustic Impedance (g/cm 2 -μsec) Air (20°C, 1 bar) 0.0344 0.00119 0.000041 Water (20°C) 0.148 1.0 0.148 Polyethylene 0.267 1.1 0.294 Aluminum 0.632 2.7 1.710