Overall barrier property of vinyl bag package is not equal to that of material. Barrier property of drawstring bag package which is made of high barrier property material is unnecessarily good. Sealing place of cosmetic packaging and connecting place of bottle body and bottle cap are the weak points of overall barrier property of transparent bag package, and are places easy to appear leakage. At present, the understanding of barrier property is rather one-sided. Material test is highly valued while importance of overall barrier property is not fully realized, which is related with the slow development of permeability instruments and its test methods. The TOY serial oxygen permeability instruments introduced by Labthink can perform oxygen permeability testing of film and package in required positions with excellent test results. Labthink has also realized the overall permeability testing of carbon dioxide.Except vacuum vinyl bag package, there are certain remnant gases existing in inner package, which (especially oxygen) will impose influences on some sensitive drawstring bag products. That is why the processing of remnant gases becomes extremely important. Modified gas package and vacuum cosmetic packaging are widely used in packages with high deoxygenation requirements. Moreover, adding deoxygenation elements in the packaging material can greatly increase oxygen barrier property of materials as well as absorb the remnant oxygen of inner transparent bag. Gas content (at present, only oxygen and can be tested) of package top space can be tested with headspace analyzer. However, the test precision is not high and it is only used as an assistant test. http://www.niceindustry.co.uk/about.asp