Abstract: Natural plant essential oil coating materials with non-toxic, bactericidal, and antioxidant properties are increasingly used in food packaging for fruits, vegetables, fresh food, etc. While ensuring good sterilization and antiseptic effects, they should have good oxygen permeability and High oxygen transmission rate. This paper uses a certain natural plant essential oil coating as a test sample, and uses the Labthink C230 oxygen permeability tester to test the oxygen permeability of the sample, and through the test principle, equipment parameters and application scope, test process and other content The introduction of the paper provides a powerful data reference for the natural plant essential oil coating process.
Keywords: natural plant essential oil coating, oxygen permeability, oxygen permeability, sterilization, corrosion protection, oxygen permeability tester
1. Significance
At present, domestic and foreign food preservation methods mainly adopt low-temperature refrigeration or freezing, chemical preservation, modified atmosphere preservation, irradiation preservation and special coating film preservation. Although the preservation effect is significant, the cost is high, inefficient and there is a danger to food safety. problem. Nowadays, some non-toxic natural plant essential oils with antibacterial and anti-oxidant properties have gradually attracted attention in the field of food preservation because they do not affect the original quality of food during use. For example, using the active ingredients of natural plant essential oils to spray and coat fruits and vegetables can keep fruits and vegetables fresh for a long time. Using emulsifying and dispersing means, natural plant essential oils such as garlic essential oil, clove essential oil, cinnamon essential oil and other essential oils are dispersed in an aqueous solution using carboxymethyl cellulose sodium, chitosan and other substances as carriers, and a stable and high-performance coating film is formed to keep fresh The materials have been widely used in fruits, vegetables, aquatic products, and poultry eggs, providing a convenient, safe, and environmentally friendly fresh-keeping technology method for the storage, transportation, and sales of the above foods.
On the basis of guaranteeing sterilization and antisepsis, natural plant essential oil coating fresh-keeping materials need to maintain good oxygen permeability to ensure that fruits and vegetables and other foods have a good breathing effect and prevent spoilage. Therefore, the oxygen permeability of this thin film material needs to be strictly verified, and its use significance for sterilization and oxidation resistance cannot be lost due to its poor oxygen permeability.
Figure 1 Example drawing of natural plant essential oil coating
2. Test basis
The testing methods for the oxygen permeability of diaphragm materials are mainly divided into two types: differential pressure method and isobaric method. In view of the special nature of the plant essential oil coating material, this test uses the isobaric method (coulometric method) to test the sample. The standard used is GB / T 19789-2005 "Coulometer Test Method for Oxidative Permeability Test of Plastic Films and Sheets of Packaging Materials".
3. Test samples
The sample tested in this experiment is a kind of natural plant essential oil coating material developed by a college.
4. Test equipment
The test equipment used in this article is C230 oxygen permeability tester (independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.).
Figure 2 C230 oxygen transmission rate tester
4.1 Test principle
The isobaric method refers to a method in which the gas pressure on both sides of the sample is always consistent during the test. One side of the sample is filled with carrier gas high purity nitrogen, and the other side is the test gas high purity oxygen. Under the action, oxygen will penetrate into the high-purity nitrogen side through the sample and be carried by the nitrogen to the Coulomb sensor for testing and analysis, so as to obtain the relevant parameters such as oxygen permeability of the sample.
4.2 Device parameters
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 test range of container samples is 0.0005 ~ 25 cm3 / (pkg · d).
The equipment has a wide range, the oxygen core adopts electromagnetic protection design, and has self-maintenance function, high resolution, long equipment maintenance interval, and low cost of use.
The device is equipped with three test chambers, and the average value of three samples can be obtained in one test, which improves the test efficiency of the device.
The temperature control range of the equipment is 10 ~ 55 ℃, and the temperature control accuracy is ± 0.2 ℃; the humidity control range is 0% RH ~ 90% RH, and the humidity control accuracy is ± 2% RH. It can meet the requirements of different test conditions of users.
Provide rapid calibration of standard membranes to ensure the accuracy and versatility of test data.
4.3 Scope of application
(1) This equipment is suitable for testing oxygen permeability of packaging materials such as films, sheets and containers.
Films include various plastic films, coating films, paper-plastic composite films, co-extruded films, aluminized films, aluminum foils, aluminum-plastic composite films and other film-like materials.
Sheets include various engineering plastics, rubber and other sheets, such as PP sheets, PVC sheets, PVDC sheets, etc.
Containers include bottles, bags, cans, boxes, barrels made of plastic, rubber, paper, paper-plastic composite, glass, metal and other materials, such as coke bottles, peanut oil barrels, Tetra Pak packaging, jelly cups, yogurt cups, metal Three-piece can, toothpaste tube, cosmetic plastic packaging, etc.
(2) This equipment can be extended to test the oxygen permeability of various products such as solar backplanes, plastic pipes, medical blister, contact lenses, automobile fuel tanks, battery plastic shells and other products.
(3) This equipment can meet many national and international standards, such as GB / T 19789, GB / T 31354, ISO 15105-2, ASTM D3985, ASTM F2622, ASTM F1307, ASTM F1927, JIS K7126-B, YBB 00082003, etc. .
5. Test process
(1) After testing the thickness of the sample, place it in a dry environment and adjust for 48 h.
(2) Cut 3 samples from the sample surface with a dedicated sampler.
(3) Apply a layer of vacuum grease to the periphery of the test chamber of the equipment, place the samples on the test benches of the three test chambers of the device, eliminate air bubbles between the sample and the bench top of the cavity, fix the ventilated chamber cover to ensure the test The cavity is well sealed.
(4) Set the test parameter information such as sample name, sample thickness, test temperature, test humidity, test mode, etc., click the test option to start the test.
(5) After the test is completed, the equipment displays the test results of three samples.
(6) Purge the pipeline with dry high-purity gas and turn off the equipment.
6. Test results
The oxygen transmission rates of the three samples tested in this paper at 23 ℃ and 0% RH are 2331.172 cm3 / (m2 · 24h), 2058.993 cm3 / (m2 · 24h), 2172.308 cm3 / (m2 · 24h), taking the average of the three samples as the oxygen transmission rate of the sample is 2187.491 cm3 / (m2 · 24h).
7. Conclusion
The better oxygen permeability can ensure that the natural plant essential oil coating material achieves a better preservation effect on the basis of antiseptic and sterilization. This article uses the C230 oxygen permeability tester to test the oxygen permeability of a natural plant essential oil coating film. The test results show that the application has a higher oxygen permeability, ensuring the breathability of the packaged aquatic products. The test operation is convenient and efficient, and the test results are stable and repeatable. In addition to the oxygen transmission rate, the natural plant essential oil coating film also needs to focus on the indicators including water vapor permeability, impact resistance, tensile properties and so on. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in R & D, production and packaging testing services of packaging testing equipment. Existing equipment includes oxygen transmission rate tester, water vapor transmission rate tester, intelligent electronic tensile testing machine , Pendulum impact tester, friction coefficient tester, seal tester, headspace gas analyzer, migration and non-volatile matter tester, etc., to understand the relevant testing equipment and testing service information. The more you understand, the more you trust! Labthink looks forward to enhancing technical communication and cooperation with enterprises and institutions in the industry!
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