目的 为提高塑料薄膜和薄片等食药品软包装材料氧气阻隔性的检测精度,简化实际的透气性测试而提高测试效益。方法 把系统反向泄漏和气体渗透视为分子流状态,根据气量守恒和流阻不变性,建立具有外层辅助密封室和反向泄漏的高阻隔性软包装材料透气性测试数学模型,得出透气性测试系统内、外层密封室压强和漏率变化特性,给出反向泄漏测试系统等效测试时间表达式。结果 具有外层辅助密封室的透气性测试系统等效测试时间远大于24 h,透气性测试相对误差约为1.35%。结论 具有外层辅助密封室的透气性测试装置测试,其测试结果与忽略系统泄漏的理想测试结果比较,误差可忽略,无需进行系统泄漏测量和测试校正,准确测出氧气阻隔性。为高阻隔性薄膜透气性高精高效测试提供理论依据。
Abstract
In order to improve the detection accuracy of oxygen barrier properties of soft packaging materials for food and medicine, such as plastic films and thin sheets, the work aims to simplify the actual permeability test while improving the test efficiency. The reverse leakage and air permeability of the system were visualized as molecular flow states. Based on air conservation and flow resistance invariance, the mathematical model for permeability test of high barrier flexible packaging materials with outer auxiliary sealing chamber and reverse leakage was established. The characteristics of the changes in pressure and leakage rate of inner and outer sealing chambers for permeability test system were obtained, thereby giving the equivalent test time expression of the reverse leakage test system. The equivalent test time of the test system with an outer auxiliary sealing chamber was much longer than 24 hours, and the relative error of the permeability test was about 1.35%. The test system with an outer auxiliary sealing chamber has negligible error in the test results of pressure changes in the inner sealing chamber compared to the ideal test results that ignore system leakage. The permeability test can accurately measure the oxygen barrier properties without system leakage measurement and test calibration. This provides a theoretical basis for high-precision and efficient permeability test of high barrier films.
关键词
系统反向泄漏 /
氧气阻隔性 /
分子流状态 /
透气性测试 /
等效测试时间
Key words
system reverse leakage /
oxygen barrier properties /
molecular flow state /
permeability test /
equivalent test time
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基金
福建省科技厅引导项目（2021H0053）; 泉州市高级人才创新项目（2021C031R）
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