5min after the test to see if there is fluid leaking out, and then flip the bag, tests were carried out on the other side of the filter paper. 2 water decompression method (true 

 

Air France) This method also includes vacuum pumps and vacuum generators law, often used to test the air content of more complex bag. (1) vacuum measurement method 

 

A transparent test device consists of a pressure vessel, the sample holder and a vacuum system (vacuum pump, vacuum gauge, etc.) components. This method has the following disadvantages: shape 

 

The length of time a vacuum, and unstable; good sealing performance; pressure pointer display, low accuracy. So now being phased out. (2 

 

) Vacuum generator method (use of equipment: Ming Wei detection MFY-01 seal tester) This method is widely applied in the flexible packaging industry, it 

 

Using jet principle, the positive pressure air becomes a source of negative pressure to form a stable, high-precision real-time display of electronic pressure sensor to test the degree of vacuum within the container, the micro 

 

Computer control, test parameters (vacuum and hold time) can be arbitrarily set, shorter time to reach vacuum, vacuum remained stable, sealed 

 

Good performance. Test method according to GB/T15171-1994 Flexible sealing member 3 Test Procedure: Under the action of water, the material properties of the outer layer