It is well known that oxygen for food quality has a great influence, and some
food packaging (
Such as carbonated drinks, coffee, etc. )
Through quantity also have strict requirements for CO2, so control food bags permeability as well as internal organic gas content packaging has become one of the main task of food packaging.
A, gas through the impact on the quality of the food content 1, cause fat in the food to oxidation, the oxidation can even under low temperature conditions.
Oil peroxide oxidation to produce, not only lose food edible value, and will happen yixiu, produce toxic substances.
2, most of the food bacteria reproduction growth due to the presence of oxygen, causing the deterioration of food.
3, in the process of circulation of fresh fruits and vegetables in order if you don't take the necessary protective measures, fruits and vegetables absorb oxygen for respiration emits CO2 and water, and consume a part of nutrition, make vegetable, fruit overripe, soft, the flavor changes, and so on and so forth.
4, at room temperature, the oxidation of Browning reaction much faster than heating Browning.
For food flavor, such as enrichment broth of Browning discoloration and easy oxidation of food, even if there is a small amount of residual oxygen, can also cause Browning, make the loss or deterioration of food flavor.
5, carbonated drinks, beer, coffee, juice and other products in addition to the sensitive to oxygen, carbon dioxide also has a great influence on its quality.
Second, permeability testing main method is introduced in order to prevent the occurrence of the above situation, food packaging bags for permeability test, to ensure that the packing material gas blocking performance is very necessary.
Points from the testing principle, permeability test method can be divided into the differential method and the analysis of power sensor method two kinds.
1, the method of differential pressure testing principle with thin film under test will test chamber separated into two independent space, to which side (
High pressure chamber)
Filling the test gas, formed certain pressure difference on both sides of the sample, high pressure chamber of the gas through the membrane to the low pressure chamber, by measuring the low pressure chamber pressure or volume change can be concluded that the permeability of the gas.
2, energy analysis method of sensor testing principle with thin film under test will test chamber separated into two independent air system, one side for the flow of gas under test (
Can use pure oxygen or mixed gas containing oxygen, can be set gas relative humidity)
, on the other side of liquid nitrogen.
Differential pressure are equal but different oxygen partial pressure on either side of the sample, the concentration difference, under the action of oxygen in nitrogen gas flow through the membrane to the coulometric analysis under the carrying of sensor, and material of the oxygen transmittance is calculated.
Differential pressure method and pressure testing principle is different, different test conditions, the test result of the unit is not the same,
The unit of differential pressure method is cm3 / m2 & bull;
24h•
0.
1 mpa, and constant pressure method is the unit of cubic cm/m2 & bull;
d）
, so without correction which are obtained by these two kinds of test method of original data, I don't think you can compare in theory.
But by using a standard calibration pressure equipment such as membrane and the correction factor is used to formally after test, differential pressure method and pressure test results can be compared.
Due to the theory of composite membrane technology support, the differential method has been used as a basic method in the permeability test, scientific examination organization in this way.
Its outstanding advantage is to test gas is not selective, generality of different test gases are very good.
Along with the progress of the vacuum gauge test technology, and the application of vacuum technology in equipment design, greatly improving the equipment of detection accuracy and repeatability of test data.
Sensor method is with oxygen probe technology matures, due to the use of sensor consumption components, so the equipment calibration of the proceeds of the correction factor is not effective for a long time, need periodic equipment calibrated according to the requirement, and must be replaced when sensor consumption reached a certain degree.
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