Abstract: Oxygen barrier performance is an important performance related to the quality and effectiveness of soft plastic packaging bags. It is an important basis for screening packaging materials. This paper uses aluminum-plastic composite film packaging bags for food packaging as test samples, using OX2/230 oxygen transmission rate. The test system tests the oxygen permeation of the sample as a whole, and introduces the test principle, test process, equipment parameters and scope of application, and provides reference for the enterprise to test the overall oxygen barrier performance of the soft plastic packaging bag.

Key words: oxygen barrier performance, oxygen transmission, oxygen transmission rate test system, soft plastic packaging bags, food packaging, aluminum-plastic composite materials

1, meaning

The oxygen barrier property is expressed by the oxygen permeation amount, and the oxygen permeation amount of the soft plastic packaging bag is high, indicating that the oxygen barrier property is low, and the oxygen permeation amount is low, and the oxygen barrier property is high. At present, the samples for oxygen barrier performance test of packaging materials are mainly divided into film/sheet and container according to the form. Soft plastic bags are usually cut into thin film for testing. The oxygen permeation amount permeates the oxygen per unit area per unit area. The volume is convenient for research, comparison and quality control of the oxygen barrier properties of the material. To obtain the overall oxygen permeation of the package, the film test value is multiplied by the surface area of ​​the package, which will increase the error of the result, especially for Irregularly shaped packaging bags, such as stand-up pouches, folding pockets, nozzle pouches, etc., have greater errors due to the difficulty in calculating the area of ​​the pouch. In addition, for the surface of the packaging material which is prone to creases, pinholes, and enamel-resistant packaging materials, the amount of oxygen permeation in different parts of the packaging bag is different due to defects such as creases, and is derived from the oxygen permeation amount of the material. The overall oxygen barrier properties of the package are not accurate. Therefore, to evaluate the overall oxygen barrier properties of soft plastic bags, it is more accurate to directly test the overall oxygen transmission.

2, testing basis

The test method of oxygen permeation is mainly divided into two methods: equal pressure method (coulomb method) and differential pressure method. At present, the method standard for oxygen barrier performance test of containers and packages has been published in China. GB/T 31354-2014 The coulometer test method for oxygen permeability test of containers and containers is tested according to the standard.

3, test samples

The test samples used in this paper are aluminum-plastic composite film bags for food packaging.

4, testing equipment

This paper uses OX2/230 oxygen transmission rate test system as the testing equipment, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.

Figure 1 OX2/230 oxygen transmission rate test system

4.1 Principle of the test

The coulomb method is a detection method for quantitatively testing the oxygen permeated through the sample by using a coulomb counter. The method uses the difference in concentration as the power for oxygen to permeate in the sample. The specific process is that the pressures on both sides of the sample remain equal during the test. One side of the sample is made of high-purity nitrogen as a carrier gas, and the other side is high-purity oxygen. After passing through the sample to the nitrogen side, the oxygen is carried by nitrogen to the coulometer for analysis, thereby obtaining the oxygen permeation amount of the sample. For the package and container, the outside of the sample is high-purity nitrogen, and the inside is high-purity oxygen.

4.2 Equipment parameters

The test range of the container sample is 0.0001 ~ 60 cm3 / (pkg · d), the resolution is 0.00001 cm3 / (pkg · d); the test range of the film sample is 0.01 ~ 6500 cm3 / (m2 · d), The resolution is 0.001 cm3/(m2·d); three identical or different samples can be tested at the same time. The system can support up to 10 instruments in parallel connection, and establish a high-efficiency system for simultaneous testing of 30 samples; test temperature control range 15 ~ 55 °C, temperature control accuracy is ± 0.1 ° C; test humidity control range 0% RH, 35% RH ~ 90% RH, humidity control accuracy is ± 1% RH; wide range, high precision temperature and humidity control range, test Both sides of the sample can be humidified to test the sample under different temperature and humidity conditions; the world's leading pressure compensation technology guarantees high precision and repeatability of the test results; it can be combined with the water vapor transmission rate test system to form a mixture The test system is controlled by a computer to achieve simultaneous oxygen and water vapor transmission rate testing. It supports the LystemTM laboratory data sharing system to uniformly manage test results and test reports.

4.3 Scope of application

(1) This equipment is suitable for the test of oxygen permeability of containers, films, sheets and other types of samples. The containers include bottles, bags made of plastic, metal, rubber, paper, paper-plastic composite, glass, etc. Cans, boxes, barrels, such as Coke bottles, peanut oil barrels, Tetra Pak packaging, vacuum packaging bags, metal three cans, plastic cosmetic packaging, toothpaste hoses, jelly cups, yogurt cups, etc.; film types include various plastic cover films, Plastic composite film, paper-plastic composite film, co-extruded film, aluminized film, aluminum foil, aluminum-plastic composite film and other film-like materials; sheet materials include various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet, etc.

(2) Can meet the standards: GB/T 31354, ASTM F1307, ISO 15105-2, GB/T 19789, ASTM D3985, ASTM F2622, ASTM F1927, JIS K7126-2, YBB00082003 and many other national and international standards.

5, the test process

5.1 Sealing and cutting off one corner of one of the sealing edges, insert the inlet and outlet holes of the special sample holder of the container into the inside of the sample from the cutting edge, and then seal the sample on the tray with quick-setting glue.

Figure 2 Sealing sample

5.2 Loading The sample holder of the sealed sample is clamped on the equipment, and the sample and the tray holder are sealed and sealed with a sealed bag.

5.3 Test set the parameter name, test temperature, test humidity, test mode and other parameters information, click the test option, the test begins. Start the air supply and adjust the carrier gas flow and humidity.

5.4 After the end of the test, the device automatically displays the oxygen transmission test value of the sample.

6, test results

In this test, the arithmetic mean of the test values ​​of the two samples tested was taken as the oxygen permeation amount of the aluminum-plastic composite film for food packaging, and the result was 0.2346 cm3/(pkg·24h).

7. Conclusion

Good oxygen barrier performance is one of the key performance indicators for food packaging. This paper uses the principle of equal pressure method to test the oxygen permeability of the aluminum-plastic composite film packaging bag for food packaging. From the experimental process, the operation Simple, high degree of equipment automation, high test accuracy, test results can accurately reflect the overall oxygen barrier performance of the package. For the aluminum-plastic composite film packaging bag, in addition to the oxygen barrier performance, the heat sealing strength, sealing performance and smash resistance of the packaging are also important factors determining the amount of oxygen permeating into the package in the environment. The corresponding testing equipments are respectively Intelligent electronic tensile testing machine, sealing tester, and sputum tester, to understand the relevant information of the equipment, you can log in to view. 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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