Abstract: The oxygen transmission rate of packaging is an important factor affecting the quality of coconut juice. The packaging with high oxygen barrier properties can maintain the taste of coconut juice for a long time and prevent the deterioration of coconut juice. In this paper, Labthink OX2/230 oxygen transmission rate test system is used to test the oxygen permeability of a brand of coconut milk packaging plastic bottles, and through the description of the test principle, equipment parameters and scope of application, test process, etc. Provide a reference for companies to monitor the oxygen barrier properties of coconut packaging.
Key words: coconut juice, plastic bottle packaging, oxygen transmission rate, oxygen barrier performance, oxygen transmission rate test system
1, meaning
Known as “Healthy First Juiceâ€, coconut milk is processed from coconut meat and contains rich nutrients such as protein, vitamin C, calcium and potassium. It has the effects of cooling off heat, hurricane, qi and beauty. It is a favorite vegetable protein drink. With the improvement of people's health awareness and consumption level, the freshness and taste of coconut juice have become an important factor influencing whether coconut juice manufacturers can establish themselves in the market and expand their market share. In order to maintain the original flavor of coconut juice, in addition to advanced In addition to the production process, the packaging used is also crucial.
Taking the oxygen barrier property of the package as an example, if the oxygen transmission rate of the package is high, the coconut juice is exposed to more oxygen during storage and circulation, and the protein, vitamin C and the like in the component are easily oxidized, nutrient loss, and taste occurs. Variety. Common coconut juice is packed with metal cans, plastic bottles, etc. Metal cans have high barrier properties and good light-shielding properties, but are easily deformed by extrusion, and have high cost. The plastic bottles are light, easy to transport, and low in cost, compared with metal cans. The oxygen barrier performance is slightly poor. Therefore, reducing the oxygen transmission rate of the plastic bottle by researching and monitoring the oxygen barrier performance of the plastic bottle is one of the key steps to promote the complete replacement of the metal can in the coconut juice packaging by the plastic bottle.
Figure 1 Common coconut packaging
2, test samples
In this paper, a brand of coconut milk packaging plastic bottle is used as a test sample to test its oxygen transmission rate.
3. Test basis
At present, the oxygen permeability test methods for packaging materials mainly include pressure difference method and isobaric method (coulomb meter detection method). In this paper, the water vapor transmission rate of the sample is tested by isostatic method. According to the standard GB/T 31354-2014 "Copper Test Method for Oxygen Permeability Test Method for Packages and Containers", this standard applies to the oxygen permeability test of plastics and composite packaging parts and containers.
4, test equipment
This test uses the OX2/230 oxygen transmission rate test system to test the sample. The equipment is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd.
Figure 2 OX2/230 oxygen transmission rate test system
4.1 Principle of the test
The isobaric method, also known as the coulomb counter method, tests the oxygen transmission rate of a sample based on the linear relationship between the current intensity and the amount of oxygen entering the Coulomb sensor. The oxygen permeation process is based on the principle of gas dissolution and permeation. The upper and lower test chambers of the equipment are separated by the sample. The upper chamber is high-purity oxygen, the lower chamber is filled with high-purity nitrogen, and the oxygen is in the concentration difference. Under the upper chamber, the sample is permeated into the lower chamber, and the nitrogen in the lower chamber carries the oxygen into the Coulomb sensor for testing and analysis, and the oxygen transmission rate of the sample is obtained. For the container sample, the inside of the container corresponds to the lower chamber of the device, and the high-purity nitrogen flows, and the outside of the container corresponds to the upper chamber of the device, and the gas that is introduced is high-purity oxygen.
4.2 Equipment parameters
Test range: container test 0.0001 ~ 60 cm3 / pkg · d, film test 0.01 ~ 6500 cm3 / (m2 · d).
Number of samples: Three or three different samples can be tested simultaneously.
Resolution: container 0.00001 g/pkg·d, film 0.001 cm3/(m2·d).
Test temperature range: 15 ° C ~ 55 ° C, temperature control accuracy ± 0.1 ° C.
Test humidity range: 0% RH, 35% RH ~ 90% RH, temperature control accuracy ± 1% RH.
Test gas: O2, air (air source user-supplied).
The system can support up to 10 instruments in parallel connection, and establish an efficient system for simultaneous testing of 30 samples.
It can be combined with the water vapor transmission rate test system to form a hybrid test system, which is controlled by a computer to achieve an efficient and convenient test method for simultaneous oxygen and water vapor transmission rate testing.
Support LystemTM laboratory data sharing system to manage test results and test reports.
4.3 Scope of application
(1) This equipment is suitable for oxygen transmission rate testing of containers, plastic film, sheet, paper, cardboard and composite materials. Containers include oxygen transmission rate tests for bottles, bags, cans, boxes, and barrels made of plastic, rubber, paper, paper-plastic composite, glass, metal, etc., such as Coke bottles, peanut oil barrels, Tetra Pak, Vacuum packaging bags, metal three-piece cans, plastic cosmetic packaging, toothpaste hoses, jelly cups, yogurt cups, etc. The film material includes oxygen permeability test of film materials such as various plastic films, paper-plastic composite films, co-extruded films, aluminized films, aluminum foils, and aluminum foil composite films. The sheet material includes oxygen transmission rate tests of various sheet materials such as engineering plastics, rubber, and building materials, such as PP sheets, PVC sheets, and PVDC sheets.
In addition, the special configuration fixture of this equipment can also be applied to oxygen transmission rate test of special packaging such as medical packaging, automobile fuel tank, battery plastic casing, plastic pipe and solar backing.
(2) This equipment can meet a number of national and international standards, such as GB/T 31354, ISO 15105-2, GB/T 19789, ASTM D3985, ASTM F2622, ASTM F1307, ASTM F1927, JIS K7126-2, YBB 00082003.
5, the test process
(1) Seal the plastic bottle sample with the quick-setting glue on the tray of the container-specific sample holder.
(2) Mount the sample holder to the equipment and seal the sample and the tray with a sealed bag.
(3) Set the sample name, test humidity, test temperature and other parameters, click the test option, the test starts.
(4) Start the air supply and adjust the carrier gas flow and humidity. The device automatically records the oxygen transmission during the test and, after the end of the test, displays the final measured oxygen transmission test results.
6, the results
The oxygen permeability of the plastic bottle for coconut packaging tested this time was 0.0103 cm3/(pkg·d).
7. Conclusion
The oxygen transmission rate of plastic bottles for coconut juice packaging is an important factor affecting the taste and freshness of coconut juice. This paper uses the principle of equal pressure method to utilize the OX2/230 oxygen transmission rate test system for the oxygen of a brand of coconut juice packaging plastic bottles. Through the test of transmittance, the test process is simple, the degree of intelligence is high, the accuracy of the test results is good, and the oxygen barrier performance of the sample can be truly reflected. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise mainly engaged in the production, research and development and testing services of packaging inspection equipment. In addition to the testing equipment used in this paper, the equipment developed by the company also includes water vapor transmission rate testing equipment. , differential pressure oxygen transmission rate testing equipment, intelligent electronic tensile testing equipment, sealing tester, torque meter, evaporation residue constant weight meter, thickness gauge, tear meter, friction coefficient meter, etc., to understand other equipment information and Check the service content, you can log in to view. The more you understand, the more you trust! Labthink is looking forward to enhancing technical communication and collaboration with enterprises and institutions in the industry!
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