The aeriform requirement that this kind of method can adopt different humidity, temperature and different oxygen content checks, effectively imitate is packed in actual medium action condition, the sample in checking a process two lateral pressure are same, can reduce the leak in experiment process and the destruction to sample.

Try the choice of proved recipe law: Introduced simply to pack film to cut off in front the problem that the in checking method and experiment process need of function notes, so detecting actually in the process, should choose that standard to have a test, method of every kinds of test has what kind of characteristic again, taking such issue, the author shows home commonly used cut off list of function test method is as follows:

Try proved recipe way, the unit tests a requirement, advantage, limitation, vapor appears excessive GB/T1037-1988 (cup type law) G/m2·24h38 ℃ , ℃ of 90 ％ RH23, 90 ％ RH calls serious way simple, convenient, easy operation.

Fully wet cup calls serious way repeatability difference, measure time long, precision is low, the factor that affects its to measure an outcome is more.

ASTMF1249-2001 (infra-red law) G/m2/d did not make clear a regulation, use 38 ℃ commonly, the how many need that 90 ％ RH checks coca of time weak point, precision to be measured according to passing through chooses appropriate standard film.

Aerobic body appears excessive GB/T1038-2000 (the law that press difference) Cm3/m2·d·Pa23 ℃ , 0 ％ RH is simple, convenient, OK determine all sorts of gas cannot imitate uses a case actually.

ASTMD3985-1988 (etc control a standard) the gas that Mol/m·s·Pa can control different humidity, temperature and different oxygen content without specific provision, effectively imitate packs actual use condition, the sample in checking a process two lateral pressure are same, be helpful for reducing the leak in experiment process and the destruction to sample.

Undertake detecting in the light of oxygen only.

Particular case should be inspected when afore-mentioned options that test a method and decide. Notable is oxygen the outcome that measures between the method of two kinds of experiments that passes through a quantity can not compare a gender. At present home passes through a quantity to vapor detect use GB/T1037-1988 and ASTMF1249-2001 commonly, to tall cut off contain in the material that pack and structure hygroscopic older stuff (wait like paper, cellophane, nylon) vapor passes through a quantity detect the proposal uses infra-red calibrating method, this kind of method has a test time weak point, precision tall, repeatability is good wait for an advantage. Detect to what gas passes through a quantity general and most is to detect of oxygen through the quantity, test character is strong and when the material of fragile easy injury passes through a quantity like the oxygen of vacuum plating aluminous film, the proposal is used etc press a law to determine. This method is sealed when fixed sample step is better, and this method is nonexistent vacuumize measure, because this need not fear plating is aluminous,the layer is injured. No matter collect the where on in order to to plant,to multi-layer packaging material the method detects its cut off function, because its structure is not particular symmetrical, put in the issue of side of positive and negative of sample consequently.
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