Abstract: Protein film is a kind of green environmental protection packaging material. It has broad development space under the form of advocating environmental protection. Taking an example of a wheat protein film samples, using a test of its oxygen-permeability of Labthink OX2 / 230 oxygen transmission rate test system, to overcome the fragile characteristics of membrane protein, and by testing principle, device parameters and A brief introduction to the scope of application, test procedures, etc., provides a practical method for testing the oxygen barrier properties of protein membrane samples. Key words: oxygen transmission rate, oxygen permeation test system, oxygen barrier property, protein membrane, temperature, humidity 1 , meaning Protein membrane, as its name suggests, is made from animal protein isolates or plant protein isolates, and is added with additives such as plasticizers and cross-linking agents. Common protein membranes include whey protein membrane, wheat gluten protein membrane, and soy protein isolate. Membrane, zein film, peanut protein isolate film, etc., depending on the type and application field of the protein film, the film formation method includes casting film formation, coating or spray film formation, extrusion film formation, and the like. Protein film is an edible, degradable film used for product packaging, especially food packaging, which can effectively solve the food safety hazard caused by plastic packaging and reduce the environmental burden of plastic packaging waste. Therefore, protein The application and research and development of membrane materials has become a research hotspot. In view of the fact that oxygen is one of the causes of quality problems such as oxidative deterioration and mildew in foods, oxygen barrier performance is an important performance that protein membranes cannot be ignored as food packaging. Due to the characteristics of its structure, the protein film is usually sensitive to humidity. When the ambient humidity is low, it is easy to lose water and break. When the humidity is high, it is easy to absorb water and stick, so during the oxygen permeability test. Control of test conditions is particularly important. 2 , test samples This test uses a wheat protein membrane developed by a company as a test sample. 3 , testing basis At present, there are two methods for testing the oxygen transmission rate: the equal pressure method and the differential pressure method. In order to prevent the sample from being damaged due to the pressure on both sides, the equal pressure method is used for this test, and the corresponding standard is GB/ T 19789-2005 " Colour meter test for plastic film and sheet oxygen permeability test of packaging materials ". 4 , testing equipment The test equipment used in this test is the OX2/230 oxygen transmission rate test system, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd. Figure 1 OX2/230 oxygen transmission rate test system 4.1 Test principle The isobaric method, also known as the coulomb meter detection method, describes the gas pressure on both sides of the sample, and the latter describes the detection method used. During the test, the sample is clamped between the test gas chamber and the test chamber. The high-purity oxygen flows in the test gas chamber, and the carrier gas flowing in the test chamber is a high-pressure nitrogen gas of equal pressure. According to the principle of gas diffusion, oxygen Under the action of the concentration difference, the test gas chamber penetrates into the test chamber through the sample, and is carried by nitrogen to the coulometer sensor for oxygen concentration analysis, thereby obtaining parameters such as oxygen permeability of the sample. 4.2 Equipment parameters The device is suitable for testing the oxygen transmission rate of various types of samples, including films, such as various plastic cover films, plastic composite films, paper-plastic composite films, co-extruded films, aluminized films, aluminum foils, aluminum-plastic composite films, etc. Membrane materials; sheet materials, various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet, etc.; containers, all kinds of plastic, rubber, paper, paper-plastic composite, Oxygen transmission rate test of bottles, bags, cans, boxes and barrels made of glass, metal, etc., such as Coke bottles, peanut oil barrels, Tetra Pak packaging, vacuum packaging bags, metal three-cans, plastic cosmetic packaging, toothpaste soft Tube, jelly cup, yogurt cup, etc. Can meet a number of national and international standards ISO15105-2, GB / T19789, ASTM D3985 , ASTM F2622, ASTM F1307, ASTM F1927, JIS K7126-2, YBB00082003 and so on. 5 , the test process (1) Three samples of the sample were taken from the wheat protein film sample by a sampler . 3 samples were taken to cut the clamping device 3 in a permeation cell. (2) Set the test parameters such as test temperature, humidity, sample name, thickness, etc., select the test mode, click the test option, and the test starts. In order to prevent the sample from chipping during the test, the temperature and humidity of this test were set to 23 °C and 60% RH , respectively . Adjust the gas flow so that the humidity in the permeation tank reaches the set value. (3) After the test is over, the device automatically displays the test results of the three samples. Purge the tubing and turn off the device. 6 , test results The oxygen permeation amounts of the three samples of the wheat protein film sample tested in this test were 7651.3241 cm 3 /(m 2 ·24h) , 7670.0569 cm 3 /(m 2 ·24h) , 7656.3753 cm 3 /(m 2 ·24h), respectively. , the oxygen permeability of the sample was weighed average of three test results for 7659.2521 cm 3 / (m 2 · 24h). 7 , conclusion In the test of the oxygen permeability of the protein membrane, the control of the test conditions is particularly important, otherwise it is prone to fragmentation, resulting in failure of the test. The OX2/230 oxygen transmission rate test system can obtain three test results in one test, which greatly improves the test efficiency. The test results are reproducible and stable, and can accurately reflect the oxygen permeability of the tested protein film samples. Test conditions, the sample was not damaged during the test. Jinan Languang Electromechanical Technology Co., Ltd. is a high-tech enterprise specializing in the production, research and development and testing services of packaging inspection equipment. The testing equipments developed so far cover the barrier properties of materials such as oxygen, nitrogen, water vapor and carbon dioxide. Testing for impact resistance, puncture resistance, friction properties, smash resistance, sealing performance, evaporation residue, solvent residue, etc., can serve food, pharmaceutical, chemical, daily chemical products, automotive, packaging materials manufacturers and many other fields. For related testing equipment and testing services, you can call Jinan Languang for details . The more you understand, the more you trust! Labthink is looking forward to enhancing technical exchanges and cooperation with users in various industries. 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