Air Permeability Test Model and Characteristics for High Barrier Film Based on System Reverse Leakage

LIU Xiaofeng; SU Zhicong; HU Baofa; ZHUANG Jiafu; CHU Ruobo

doi:10.19554/j.cnki.1001-3563.2026.01.004

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (1) : 31-37. DOI: 10.19554/j.cnki.1001-3563.2026.01.004

Advanced Materials

Air Permeability Test Model and Characteristics for High Barrier Film Based on System Reverse Leakage

LIU Xiaofeng^*, SU Zhicong, HU Baofa, ZHUANG Jiafu, CHU Ruobo

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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.

Key words

system reverse leakage / oxygen barrier properties / molecular flow state / permeability test / equivalent test time

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LIU Xiaofeng, SU Zhicong, HU Baofa, ZHUANG Jiafu, CHU Ruobo. Air Permeability Test Model and Characteristics for High Barrier Film Based on System Reverse Leakage[J]. Packaging Engineering. 2026, 47(1): 31-37 https://doi.org/10.19554/j.cnki.1001-3563.2026.01.004

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