Abstract : The OX2/230 Oxygen Permeability Test System independently researched and manufactured by Jinan Languang Electromechanical Technology Co., Ltd. was used to monitor the oxygen-preventing performance of vegetable fresh-keeping packaging. By introducing the parameters, application scope and test process of the equipment, fresh vegetable processing and Its packaging materials manufacturing industry provides technical references on the quality and safety of the products during the warranty period and the extended shelf life. Keywords: oxygen permeability, oxygen barrier, oxygen barrier, fresh vegetables, fresh-keeping packaging, modified atmosphere packaging, oxygen permeability test system 1 , the meaning Fresh vegetables still have complex physiological and biological changes during the sale process. During the breathing process, vegetables absorb oxygen, generate carbon dioxide and ethylene gas, and reduce their own moisture. Therefore, low concentration of oxygen and ethylene, high concentration of carbon dioxide, low temperature, high humidity and aseptic environment are more conducive to the preservation of fresh vegetables and extend the shelf life. At present, in order to maintain the freshness of vegetables and increase shelf life, fresh-keeping packaging is used for such new packaging technologies. One of the most widely used fresh-keeping packagings is Modified Atmosphere Packaging ( MAP ), which regulates the proportion of various gases in the package during storage to ensure that the decay and deterioration of vegetables are suppressed. Modified atmosphere packaging replaces the air inside the package and fills the atmosphere of the vegetables with carbon dioxide, nitrogen, oxygen and other gases in a certain proportion. Among them, carbon dioxide can inhibit the growth and reproduction of most spoilage bacteria and molds; oxygen can inhibit the growth of most anaerobic bacteria and maintain the respiratory metabolism of fresh vegetables in their fresh state; nitrogen as an inert gas can be used as a filling gas to prevent the gas in packaging. The resulting packaging collapses and does not produce any absorption or chemical effects with the vegetables. Therefore, in order to prevent the oxygen in the outside air from affecting the gas composition in the interior of the package, the modified atmosphere packaging requires a packaging material with a relatively high oxygen barrier property. How to monitor the barrier properties of packaging materials to oxygen, this article will use the OX2/230 oxygen permeability test system independently developed by Jinan Languang Electromechanical Technology Co., Ltd. to test the oxygen transmission rate of air-conditioned fresh-keeping packaging composite membranes. FIG 1 Atmosphere Packaging - Modified Atmosphere 2 , the status quo The oxygen barrier test method for plastic packaging is divided into equal pressure method and differential pressure method. Among them, the coulometric sensor is used to precisely test the oxygen permeability of high barrier materials, the detection limit is low, and the pressure difference method can be used to break through the two methods. The unavoidable impact of side pressure differentials on plastic containers extends to container testing. At present, the domestic isobaric test oxygen permeability test follows the national standard of GB/T 19789-2005 “ Coulomb Test Method for Testing Plastic Film and Sheet Oxygen Permeability of Packaging Materials â€. We will use the OX2/230 Oxygen Permeability Test System independently developed by Labthink to combine this standard with the oxygen permeability test of the sample. 3 , test sample A brand of fresh potato chips modified atmosphere packaging preservation composite film. 4 , test equipment The test equipment used in this article is Labthink 's OX2/230 oxygen transmission test system. Figure 2 OX2/230 oxygen transmission rate test system 4.1 Test principle OX2/230 uses the isobaric test principle. The pre-treated sample is clamped between the test chambers. Oxygen flows on one side of the membrane and high-purity nitrogen flows on the other side of the membrane. Oxygen molecules diffuse through the membrane into the high-purity nitrogen in the other side and are carried by the flowing nitrogen to the internal coulomb electricity sensor. The sensor can release four electrons when absorbing every oxygen molecule, utilizing the oxygen molecules and electrons. The linearly proportional relationship of the quantity is used to calculate the oxygen transmission rate. This process is not affected by the osmotic concentration and sensor environment changes. For packaging containers, high-purity nitrogen flows in the container, and air or high-purity oxygen surrounds the outside of the container. 4.2 Equipment Parameters OX2/230 Oxygen Permeability Test System ( Labthink ) with ultra-high precision, independent three-cavity structure can test three identical or different samples at the same time, the temperature control range is 15 °C ~ 55 °C , and the humidity control range is 0%RH , 35%RH ~ 90%RH , film oxygen permeability test range (0.01 ~ 6,500) cm3/m2 · 24h , and can be extended to (0.07 ~ 6,5000) cm3/m2 · 24h . This system can also be extended to test Oxygen Transmittance Ranges from 0.0001 to 60 cm3/(pkg·d) containers. System 10 may be implemented instruments are connected in parallel, an efficient system of 30 samples tested simultaneously. 4.3 Scope of application The instrument satisfies ISO 15105-2, GB / T 19789, ASTM D3985, ASTM F2622, ASTM F1307, ASTM F1927, JIS K7126-2, YBB 00082003 a number of national and international standards, can meet a variety of different soft plastic temperature and humidity environment Film, paper-plastic composite film, co-extruded film, aluminized film, aluminum foil, aluminum foil composite film and other film materials and various materials sheet oxygen barrier test, and can expand the test made of various materials bottles, bags, cans Oxygen permeability test for boxes, boxes and barrels. 5 , the test process (1) The composite film sample was placed in a 23 °C environment and placed in a desiccator for 48 hours. After removal, from the sample having a diameter of clipping a sample 108 × 108 mm 3. (2) Apply a layer of vacuum grease to the edges of the outer edges of the air-permeable outdoor surface to prevent grease from being applied to the cavity intermediate disc. The vacuum grease (3) 3 has been completed for conditioning samples were clamped in OX2 / 230 oxygen transmission rate test system 3 coated the surface of the outdoor air-permeable, to avoid wrinkles sample, the sample is pressed softly Good contact with vacuum grease. Cover the breather cover and fasten and seal it. (4) Add distilled water, open the system air supply, and adjust the air source pressure as required. According to the test requirements, add proper amount of distilled water to achieve the required O2 , N2 humidity. (5) Turn on the power and run the software. (6) set the test temperature, test parameters, start the test. Test parameters include equipment control parameters (test mode, number of test cycles, test time, etc.) and sample parameters (type, area, thickness, etc.). (7) Click to start the test option and the test begins. The instrument automatically records test process data and calculates the final test results. (8) Turn off the air supply and power supply. 6 , test results Three modified atmosphere packaging oxygen transmission rate of film sample were 0.6103 cm3 / m2 · 24h, 0.6577 cm3 / m2 · 24h, 0.5914 cm3 / m2 · 24h, the relative average deviation between the results of three samples were Less than 10% . The oxygen permeability of the sample is low, that is, the barrier property to external oxygen is better. 7. Conclusion OX2/230 Oxygen Permeability Test System When monitoring fresh oxygen barrier properties of fresh vegetable packaging, you can obtain high repeatability and reproducibility of oxygen permeability results, which can accurately reflect the barrier properties of fresh-keeping packaging materials. The test equipment and test standards used in this test are also applicable to the oxygen permeability test of soft plastic composite membranes and containers for other applications. In addition to the Oxygen Permeability Test Equipment, Labthink can also provide you with various physical and mechanical properties such as shrinkage, tensile strength, and sealing performance of fresh-keeping packaging materials. For detailed information about the equipment, you can visit Languang, Jinan. Check the company website or call for advice. The more you understand, the more trust! Jinan Languang Electromechanical Technology Co., Ltd. is willing to take this opportunity to increase technical exchanges and cooperation with enterprises and institutions in the industry.
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August 13, 2019