Current, a lot of manufacturers used the method that measures directly to enraging tone to pack, pack in the product namely after finishing, use analyzer of very empty gas to check among them oxygen first or the chroma of carbon dioxide, after putting the product a few months next, check the chroma of oxygen or carbon dioxide to approving a product together again, according to the chroma change speed in proper time, come computative arrive the chroma of the oxygen before goods shelves period ends, whether can make food happening affects the oxidation of edible safety. Although this is the method with a simple economy, but experimental cycle is long, although still can be passed,add lukewarm, tall wet will quicken, but average time still can be in above of a month, this accuses to tasting and the efficiency of job of research and development brings a few influences, at the same time the precision problem as a result of analyzer sensor, as a whole, this method still is method of test of a simple only.

Measure the oxygen vapour lock that pack to separate function, the fastest and accurate method is to use the instrument that appear oxygen to undertake detecting, detect basically the principle has the law that press difference and etc control a standard two kinds, to tall cut off low osmotic material, the proposal is used wait for the device that controls a standard, the mainest on the world waiting for standard of the international that control a standard is ASTMD3985, equipment uses coulomb n absolutely sensor, detect thoroughly the oxygen that pass through, it is having taller sensitivity and repeatability, and wait for the device that controls a standard to be able to detect the rate appearing oxygen that whole packs, include bottle, canister, flexible package to wait. And the sensitivity of equipment of the law that press difference is inferior, suit to test the material of 1.0ml/m2.24hours above only at most, and cannot pack to whole undertake detecting.

Rise ceaselessly as what flowing water of person the people's livelihood makes the same score, the safety that everybody packs to food asks to be strengthened gradually, but the look just still stays in remain of accretion, dissolvent to wait on, but actually food packs cut off the action that function holds the balance to making sure the safety of food is having, again good food, again of environmental protection pack, if cut off performance is bad, a large number of infiltration of oxygen, meeting richen is contained adipose with the vitamin kind food becomes angry, with a ha change or acid is defeated, or make bacterium and mould breed in great quantities, affect the quality of food directly. What say to make sure food is packed so is good cut off the gender also is the indispensable one annulus in assuring food safety link.



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