Evaluation of heat seal quality of aseptic food containers by ultrasonic and optical microscopic imaging
Evaluation of heat seal quality of aseptic food containers by ultrasonic and optical microscopic imaging
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通过超声波和光学显微成像评价无菌食品容器的热封质量
DOI：
10.1007/s00217-003-0769-1
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Q. Zhang
中科院分区：
文献类型：
--
作者：
Z. Ayhan;Q. Zhang
通过超声成像方法评价了无损检测，以确定在150 - 200 ° C温度范围内密封的无菌生产的半刚性髋臼杯的热封质量。使用由20 MHz超声换能器产生的高频声波以脉冲/回波模式进行非接触式超声检测，以评估热封质量。为了将超声波响应与实际密封条件联系起来，对半刚性容器的各个密封区域进行了切片，用于光学显微成像和密封表征。结果表明，超声信号能够反映封接过程对封接完整性的影响。超声波信号的变化表明在150 - 170 ° C的密封温度下热密封不充分或不均匀，导致密封不牢固或不连续。在所有密封温度下均观察到短密封宽度，表明密封工具未平行对齐。光学成像与超声成像具有良好的相关性。然而，热封的均匀性与超声波信号的幅度没有很好的相关性，这可能是由于热封的不均匀表面。这些结果表明，这种无损超声检测系统可以检测热封的质量，从而消除潜在的故障并改善过程控制。
Non-destructive testing by the ultrasonic imaging method was evaluated to determine the heat seal quality of aseptically produced semi rigid cups, sealed at temperatures ranging from 150 to 200 °C. Non-contact ultrasonic testing in pulse/echo mode using high frequency sound waves generated by a 20 MHz ultrasonic transducer was used to evaluate heat-seal quality. In order to relate ultrasonic response with the actual seal condition, various seal regions of a semi rigid container were sectioned for optical microscopic imaging and seal characterization. Results showed that ultrasonic signals could reflect the effects of the sealing process on the seal integrity. Change in the ultrasonic signals indicated an insufficient or non-uniform heat seal at sealing temperatures of 150–170 °C, resulting in weak seals or discontinuities. Short seal width was observed at all sealing temperatures, indicating unparallel alignment of the sealing tool. Optical imaging correlated well with ultrasonic imaging. However, uniformity of heat seal did not correlate well with the magnitude of the ultrasonic signal, possibly due to non-uniform surfaces of heat seals. These results suggest that this non-destructive ultrasonic inspection system detects the quality of heat seals, which can eliminate potential failures and improve process control.