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    Home > Active Ingredient News > Drugs Articles > Comparative analysis of barrier performance of packaging materials to different gases

    Comparative analysis of barrier performance of packaging materials to different gases

    • Last Update: 2018-04-17
    • Source: Internet
    • Author: User
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    Abstract: with the diversified development of packaging forms, more and more kinds of gases are in direct contact with packaging The barrier of packaging materials to different gases is an important factor affecting the quality of packaging In this paper, through testing the barrier performance of BOPP / CPP film to oxygen and nitrogen, the barrier performance of packaging materials to different gases is compared and analyzed, and the test principle, test process, equipment parameters and application scope are described, providing reference for monitoring and analyzing the barrier performance of materials to gases for enterprises Key words: oxygen permeability, nitrogen permeability, BOPP / CPP, packaging materials, barrier performance, differential pressure gas permeability meter 1, significance With the increase of product types and the progress of packaging technology, there are more and more packaging forms of products, such as vacuum packaging, nitrogen filled packaging, air conditioning packaging, etc for these forms of packaging, the barrier performance of packaging materials to gas is an important factor affecting the packaging effect If the barrier of packaging materials is poor and the gas exchange volume between the inside of packaging and the environment is large, the gas content in packaging will change, which will affect the quality of packaging Taking the modified atmosphere packaging as an example, the modified atmosphere packaging maintains the appearance and quality of products by controlling the proportion of different gas content in the packaging, while the barrier capacity of the same packaging material to different gases is not the same, which is related to the size of gas molecules and their compatibility with packaging materials Generally speaking, the smaller the gas molecules, the better the compatibility with materials, and the easier the gas is in materials Medium permeability, that is, the higher the gas transmission This difference in gas transmission is likely to cause a change in the gas ratio inside the package Therefore, through the comparative analysis of different gas barrier properties, the development and selection of appropriate barrier performance of packaging materials is of great significance to ensure the quality of packaging 2 The test is based on two test principles of gas permeability: differential pressure method and isobaric method Limited by the types of sensors and test principles, the isobaric method can only test the oxygen permeability In this paper, the differential pressure method can be used to test the barrier performance of samples against different gases The standard is GB / T 1038-2000 test method for gas permeability of plastic film and sheet Differential pressure method 3 The samples selected in this test are BOPP / CPP films made by dry compounding The oxygen and nitrogen transmittance of the samples are tested respectively 4 The test equipment used in this paper is vac-vbs pressure difference gas osmometer, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd Fig 1 vac-vbs pressure difference method gas permeation instrument 4.1 test principle pressure difference method refers to the method of maintaining a certain pressure difference on both sides of the sample during the test, and obtaining the gas permeability of the sample by testing the change of the pressure on the low side The specific realization process is that after the sample is clamped on the equipment, the test chamber is divided into upper and lower chambers By vacuuming the upper and lower chambers of the equipment to a certain degree of vacuum, and then filling the upper chamber with a certain pressure of test gas, the upper and lower chambers maintain a certain pressure difference Under the effect of the pressure difference, the gas in the upper chamber penetrates into the lower chamber through the sample, and the pressure in the lower chamber is tested The gas transmission of the sample is obtained from the change of force 4.2 scope of application (1) this equipment is applicable to the gas permeability test of various films and sheets Film type includes various plastic film, paper plastic composite film, coextrusion film, aluminum coating film, aluminum foil, aluminum foil composite film and other film-like materials; sheet type includes various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet (2) The equipment can also be extended to the air permeability test of aerospace materials, paper and cardboard, paint film, fiberglass cloth, fiberglass paper, cosmetic hose sheet, various rubber sheets and other materials (3) This equipment is suitable for the transmittance test of various gases, such as oxygen, carbon dioxide, nitrogen, helium, air, etc (4) This equipment meets many national and international standards, such as ISO 15105-1, ISO 2556, GB / T 1038, ASTM d1434, JIS k7126-1, ybb00082003 4.3 test range of equipment parameters is 0.1 ~ 100, 000cm 3 / (M 2 · 24h · 0.1MPa); can complete the test of three samples at the same time, the test result is the average value of the test results of three samples; the temperature range of the sample is 15 ~ 55 ℃, the temperature control accuracy is ± 0.1 ℃; provide standard membrane for rapid calibration to ensure the accuracy and universality of the test data; support Lystem TM Laboratory data sharing system, unified management of test results and test reports 5 Test process 5.1 cut 6 pieces of 80 mm diameter sample from the surface of the BOPP / CPP film sample to be tested, and place them in a desiccator at 23 ℃ for 48 hours 5.2 oxygen permeability test (1) evenly apply vacuum grease around the three test chambers, and place filter paper in the test area Take three samples and paste them on the surface of three test chambers of the equipment, remove the bubbles between the sample and the test chamber, and clamp them with the sample clamping device Figure 2 sample clamping figure (2) set the sample name, test temperature, test humidity and other parameter information, click the test option, start the test, and turn on the vacuum pump After the test, the equipment displays the test results 5.3 nitrogen transmission test equipment connect the nitrogen gas source, and test the nitrogen transmission of the sample according to the steps in 5.2 6 The results showed that the oxygen permeability of BOPP / CPP film was 779.0179cm 3 / (m 2.24h · 0.1MPa), and the nitrogen permeability was 202.3561cm3 / (m2.24h · 0.1MPa) 7 Conclusion from the results of the experiment, the oxygen permeation of the sample is significantly higher than that of nitrogen, which indicates that the oxygen permeation through the packaging material is more in the same time and under the same conditions, which is related to the fact that the molecular diameter of nitrogen is larger than that of oxygen In addition, from the point of view of the test process, the equipment is easy to operate, the test efficiency and intelligence are high, the test accuracy is high, and the test results are reliable, which can accurately reflect the barrier performance of the tested samples to oxygen and nitrogen Jinan Languang mechanical and Electrical Technology Co., Ltd is a high-tech enterprise specializing in the research and development of packaging testing equipment, production and packaging testing services It is always committed to providing customers with professional and precise testing equipment and accurate, intimate testing services At present, the existing equipment includes gas transmission testing equipment, water vapor transmission testing equipment, intelligent electronic tensile test Machine, seal tester, friction coefficient tester, migration and non-volatile matter tester, tear tester and other equipment The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and cooperation with enterprises and institutions in the industry.
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