Does anyone know how the tightness test of packaging bags is done

Do you understand positive pressure method and negative pressure method

by vacuumizing the vacuum chamber, the internal and external pressure difference of the sample immersed in water is generated, and the gas escape in the sample is observed to determine the sealing performance of the sample; By vacuumizing the vacuum chamber, the internal and external pressure difference of the sample is generated, and the shape recovery of the sample after sample expansion and vacuum release is observed, so as to determine the sealing performance of the sample.

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for the sealing test of common packaging bags, Guangzhou standard international believes that the specific methods are different, while GB /T 15171-1994 standard is commonly used in domestic production practice. Common detection methods are:
1 Dye solution immersion method
2 Water decompression method (vacuum method)
(1) vacuum pump method (2) vacuum generator method
in addition, according to GB /T 15171-1994 test method for sealing performance of flexible packaging: under the action of water, whether the performance of the outer material will change during the test. For example, if the outer layer is packaged with plastic film, the internal and external pressure difference of the sample immersed in water can be generated by vacuumizing the vacuum chamber, The sealing performance of the sample is determined by observing the escape of gas or inward infiltration of water in the sample.

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