Abstract: The good oxygen barrier property of packaging materials is an important guarantee for preventing mildew and deterioration of Shaqima. This paper uses a plastic composite film of Shaqima packaging as a test sample, and uses Labthink blue light C230 oxygen transmission rate test. The instrument tests the oxygen transmission rate of the sample, and introduces the test principle, equipment parameters, application range, test process, etc., to provide a reference for the enterprise to monitor the barrier properties of soft plastic packaging materials for oxygen.
Key words: oxygen transmission rate, oxygen barrier property, oxygen barrier property, mildew, deterioration, oxygen permeability tester, Shaqima, plastic composite film
1, meaning
Shaqima is a common specialty cake. It is made from flour, eggs, sugar, nuts and other raw materials. It is fried, rich in nutrients, high in oil and fat content, easy to breed microorganisms and oxidative deterioration. For the mildew and deterioration of Shaqima Yi, in addition to strict control of the production process (such as the use of dynamic disinfection technology in its storage, transportation and shelf life), to prevent the total number of colonies, E. coli and other microorganisms beyond the standard, packaging barrier Performance is one of the key factors affecting the growth and reproduction of microorganisms. This is because most of the microorganisms that cause mold in Shaqima are aerobic, that is, the growth of these microorganisms is inseparable from oxygen. By placing Shaqima in a low-oxygen environment, it can effectively inhibit the growth of microorganisms and prevent sand. Qima mold, in addition, this low-oxygen environment can also avoid oxidative deterioration of oil and other ingredients in Shaqima. Therefore, the higher oxygen barrier properties (ie, oxygen barrier properties) are the basic properties that Shaqima packaging should have.
Figure 1 Shaqima common packaging materials
2. Test basis
The test method for oxygen transmission rate of soft plastic packaging materials is mainly divided into two methods: differential pressure method and equal pressure method. In this test, the sample is tested by the isostatic method. The isobaric method is also called the coulomb method. It is GB/T 19789-2005 "Packaging material plastic film and sheet oxidation permeability test coulometric measurement method".
3, test samples
The sample tested in this test is a plastic composite film for a brand of Shaqima packaging.
4, test equipment
The test equipment used in this paper is C230 oxygen transmission rate tester, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 C230 oxygen transmission rate tester
4.1 Principle of the test
The so-called equal pressure method refers to a method in which the gas pressure on both sides of the sample is always consistent during the test. The sample side is filled with carrier gas high-purity nitrogen gas, and the other side is test gas high-purity oxygen. Under the action of oxygen, oxygen will penetrate into the high-purity nitrogen side through the sample, and will be carried by nitrogen to the Coulomb sensor for testing and analysis, thereby obtaining relevant parameters such as oxygen permeability of the sample.
4.2 Equipment parameters
It is suitable for testing film and sheet samples. When the test area is 7 cm2, the test range is 0.7 ~ 35000 cm3/(m2·d). When the test area is 50 cm2, the test range is 0.1 ~ 5000 cm3/(m2·d). ), the resolution is 0.01 cm3 / (m2 · d); the test range of the container sample is 0.0005 ~ 25 cm3 / (pkg · d). The measuring range of the device is wide, the oxygen core is designed with electromagnetic protection, and has self-maintenance function, high resolution, long equipment maintenance interval and low use cost.
The equipment is equipped with three test chambers, and the average value of three samples can be obtained in one test, which improves the testing efficiency of the equipment.
The temperature control range of the equipment is 10 ~ 55 °C, the temperature control accuracy is ± 0.2 °C; the humidity control range is 0% RH ~ 90% RH, and the humidity control accuracy is ± 2% RH. Can meet the requirements of different test conditions of users.
Provides rapid calibration of standard membranes to ensure the accuracy and versatility of the test data.
4.3 Scope of application
(1) This equipment is suitable for testing the oxygen transmission rate of packaging materials such as films, sheets and containers.
l Films include various plastic film, paper-plastic composite film, co-extruded film, aluminized film, aluminum foil, aluminum-plastic composite film and other film materials.
l Sheets include various engineering plastics, rubber and other sheets, such as PP sheets, PVC sheets, PVDC sheets, etc.
l Containers include bottles, bags, cans, boxes, barrels, etc. made of plastic, rubber, paper, paper-plastic composite, glass, metal, etc., such as Coke bottles, peanut oil barrels, Tetra Pak, jelly cups, yogurt cups, etc. Metal three-piece cans, toothpaste hoses, cosmetic plastic packaging, etc.
(2) This equipment can be extended to test the oxygen transmission performance of various products such as solar back panels, plastic pipes, medical blister, contact lenses, automobile fuel tanks, and battery plastic casings.
(3) This equipment can meet a variety of national and international standards, such as GB/T 19789, ISO 15105-2, ASTM D3985, ASTM F2622, ASTM F1307, ASTM F1927, GB/T 31354, JIS K7126-B, YBB 00082003, etc. .
5, the test process
(1) After testing the thickness of the sample, it was placed in a desiccator for 48 h.
(2) Use a special sampler to cut 3 pieces of the sample from the surface of the sample.
(3) Apply a layer of vacuum grease around the test chamber of the equipment, clamp the specimens on the three test chambers of the equipment, remove the air bubbles between the sample and the test chamber, and fix the venting chamber cover to ensure the seal of the test chamber. Good sex.
(4) Set the sample name, sample thickness, test temperature, test humidity, test mode and other parameters information, click the test option, the test begins. Turn on the air supply and adjust the air supply pressure to bring the humidity in the test chamber to the set value.
(5) After the test, the equipment displays the test results of three samples. Purge the tubing and turn off the device.
6, test results
The oxygen transmission rates of the three samples tested in this paper were 55.31 cm3/(m2·d), 58.07 cm3/(m2·d), and 57.65 cm3/(m2·d), respectively. The value as the oxygen transmission rate of the sample was 57.01 cm3/(m2·d).
7. Conclusion
The oxygen transmission rate has an important influence on the quality of Shaqima during the shelf life. This paper uses the C230 oxygen transmission rate tester to test the oxygen transmission rate of a brand of plastic composite film for Shaqima packaging. The test operation is simple and the equipment is simple. The degree of intelligence is high and the test efficiency is high. The test results show that the sample has a good uniformity of oxygen transmission rate. In addition to oxygen transmission rate, the key indicators of Shaqima packaging include heat seal strength, sealing performance, grease resistance, tensile strength and modulus of elasticity, solvent residue, and total migration. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R&D, production and packaging testing services for packaging testing equipment. The existing equipment includes oxygen transmission rate tester, water vapor transmission rate tester and intelligent electronic tensile testing machine. , friction coefficient meter, seal tester, head air analyzer, migration and non-volatiles analyzer, etc., to understand the relevant testing equipment and testing service information, 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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