Research method of barrier property of packing materials before and after packing mustard tuber

Abstract: due to the food itself and its processing technology, the barrier performance of packaging materials before and after the packaging of food is likely to change Taking the packaging material of mustard tuber as an example, this paper studies the change of its oxygen barrier performance before and after contact with mustard tuber Through the introduction of the test principle, equipment parameters, application scope, test process and other contents, it provides a reference for the rational selection of food packaging materials Key words: packaging materials, barrier performance, oxygen permeability, differential pressure gas permeameter, mustard 1, the continuous development of the types and technologies of meaningful food packaging is one of the key factors for long-term storage and large-scale circulation of food Food packaging can easily achieve the relative independence of content and environment, and reduce the impact of gas in the environment on food Most of the food packaging materials are high molecular polymers Different kinds of polymers have different tolerance to acid, alkali, grease and other components in food In addition, food often goes through sterilization links such as high temperature, cooking, high pressure or irradiation after packaging These factors may affect the performance of high molecular materials, and the performance of materials before and after packaging will be different If the performance of the packaging material deteriorates, it will affect the expected quality guarantee effect of the packaging material on the content Therefore, it is of great significance to detect the performance changes of the materials before and after packaging food in time for screening suitable packaging materials and improving product quality Barrier performance is an important factor affecting the applicability of packaging materials In this paper, the barrier performance changes of packaging materials before and after food packaging were tested 2 As a common pickled food, the sample mustard contains a certain amount of juice, and the packaging of the finished product will go through a specific sterilization process At the same time, the high oxygen barrier performance is the basic performance of mustard tuber packaging materials, in order to prevent the quality problems of mustard tuber such as microorganism exceeding the standard and rancidity during the shelf life In this paper, the packaging material of mustard tuber was used as the test sample to test the change of oxygen permeability before and after packaging mustard tuber Fig 1 example of common packing forms of mustard tuber 3 Test basis at present, the detection methods of oxygen permeability of film and sheet packing materials mainly include two methods: isobaric method and differential pressure method This paper tests according to the principle of differential pressure method The reference method standard is GB / T 1038-2000 test method of gas permeability of plastic film and sheet - differential pressure method 4 In this paper, vac-vbs pressure difference gas permeameter is used as the test equipment, which is independently developed and produced by Jinan Languang Electromechanical Technology Co., Ltd Fig 2 test principle of vac-vbs pressure difference gas permeameter 4.1 the principle of pressure difference method refers to the principle of maintaining a certain pressure difference on both sides of the sample during the test The sample clamped in the test chamber divides the test chamber into upper and lower chambers, the upper chamber is filled with a certain amount of oxygen, and the lower chamber forms a low-pressure environment by vacuuming, so that a certain pressure difference is formed on both sides of the sample Under the action of pressure difference, oxygen penetrates into the lower chamber from the upper chamber through the sample, causing the pressure change of the lower chamber By monitoring the pressure change in the lower chamber with time, the oxygen permeability and other relevant parameters of the sample can be obtained 4.2 equipment parameters 0.1 ~ 100, 000cm 3 / (M 2 · 24h · 0.1MPa); it can complete the test of three samples at the same time, and the test result is the average value of the test results of three samples; the sample size is Ф 80m m, and the test area is 28.27cm2; the temperature range of the sample is 15 ~ 55 ℃, and the temperature control accuracy is ± 0.1 ℃; it can provide the standard film for rapid calibration to ensure the accuracy and universality of the test data; it supports Lystem TM Laboratory data sharing system, unified management of test results and test reports 4.3 scope of application (1) this equipment is applicable to the gas permeability test of various films and sheets Film type includes various plastic film, paper plastic composite film, coextrusion film, aluminum coating film, aluminum foil, aluminum foil composite film and other film-like materials; sheet type includes various engineering plastics, rubber, building materials and other sheet materials, such as PP sheet, PVC sheet, PVDC sheet (2) The equipment can also be extended to the air permeability test of aerospace materials, paper and cardboard, paint film, fiberglass cloth, fiberglass paper, cosmetic hose sheet, various rubber sheets and other materials (3) This equipment is suitable for the transmittance test of various gases, such as oxygen, carbon dioxide, nitrogen, helium, air, etc (4) This equipment meets many national and international standards, such as iso15105-1, iso2556, GB / t1038, ASTM d1434, JIS k7126-1, ybb00082003 5 Test process 5.1 test of raw material bag sample of mustard tuber packaging material (1) cut 3 pieces of 80 mm diameter sample from the surface of the sample without packaging mustard tuber (2) Apply a layer of vacuum grease evenly around the three test chambers, place a piece of filter paper in each test area, paste the sample on the three test chambers respectively, press the contact part between the test chamber and the sample gently, eliminate the bubbles between the two, close the chamber and clamp them respectively （3） Set the name of sample, test mode, vacuumizing time, test temperature and other parameter information on the control software of the equipment, connect the oxygen source, click the test option, open the vacuum pump, and start the test The equipment is tested according to the set parameters After the test, the average test results of three samples are displayed 5.2 test of the sample after packaging mustard (1) take out the mustard inside the sample package, cut the sample along the heat sealing part, gently clean the juice on the surface of the sample with water, and then dry it naturally The cleaning process shall prevent the sample surface from creasing (2) Test the dried sample according to the procedure in 5.1 6 The results showed that the oxygen permeability of the packed samples was 46.3201 cm 3 / (m 2.24h.0.1mpa), and that of the packed samples was 60.4467 cm3 / (m2.24h.0.1mpa) 7 Conclusion the components and sterilization process of food may affect the performance of packaging materials, so the comparative test of the performance of the materials before and after packaging is an important basis for judging the compatibility of food and packaging materials In this paper, the change of oxygen permeability of samples before and after packing mustard tuber is tested The equipment is easy to operate, highly intelligent, and the test results are reliable In addition to the oxygen permeation, the equipment can also be used to test the air, nitrogen, carbon dioxide, helium, sulfur hexafluoride and other gas barrier properties of packaging materials, with high test efficiency and high cost performance Jinan Languang mechanical and Electrical Technology Co., Ltd is a high-tech enterprise specializing in the R & D and production of packaging testing equipment and packaging testing services The more you understand, the more you trust! 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