One has a good barrier food packaging bags made of materials but also does not work without a good seal, sealing is required bag can effectively prevent foreign substances (such as water vapor, microorganisms, dust, odor) to enter and food packaging bag taste lost out. Many foods should be in well-sealed containers for storage, otherwise, they easily cause food qualitative change. Like tea is a kind of dry goods, are susceptible to damp moldy effect of water vapor in the air, while other odors in the air suction force are very strong, but the taste itself highly volatile, so the tea made on the packaging container sealing barrier strong requirements.
How the detection of food packaging bags seal it? If it is just a bag filled with liquid water, to see which places have a water leaks on the line, but like solids or other food it is difficult to detect by this means tightness, where you can seal tester to detect food bags tightness.