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How to check the air tightness of plastic packaging materials

by admin

it can be tested according to the two test methods of positive pressure sealing test (mfy-06) or negative pressure sealing test (mfy-05) pointed out in the national standard
the principle of negative pressure method is to vacuumize the vacuum chamber, make the sample immersed in water produce internal and external pressure difference, and test the escape of gas in the sample, so as to judge the sealing performance of the sample; The sealing performance of the sample can also be determined by vacuumizing the vacuum chamber to produce the internal and external pressure difference of the sample, observing the shape recovery and liquid infiltration of the sample after the expansion of the sample and the release of vacuum
the positive pressure test method is the opposite.

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