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    Home > Active Ingredient News > Drugs Articles > Monitoring scheme of oxygen barrier in fresh vegetable packaging

    Monitoring scheme of oxygen barrier in fresh vegetable packaging

    • Last Update: 2015-08-13
    • Source: Internet
    • Author: User
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    Abstract: using the ox2 / 230 independently developed and manufactured by Jinan Languang Electromechanical Technology Co., Ltd The oxygen permeability test system monitors the oxygen resistance of fresh-keeping packaging of vegetables By introducing the parameters, application scope and test process of the equipment, it provides technical reference for fresh vegetable processing and packaging material production industry on product quality and safety within the shelf-life and extending the shelf-life Key words: oxygen permeability, oxygen resistance, oxygen barrier, fresh vegetables, fresh-keeping packaging, air-conditioned packaging, oxygen permeability test system 1, meaning fresh vegetables still have complex physiological and biological changes in the process of sale, etc in the process of respiration, vegetables absorb oxygen, generate carbon dioxide and ethylene gas, and reduce their water content Therefore, low concentration of oxygen and ethylene, high concentration of carbon dioxide, low temperature, high humidity, sterile environment is more conducive to fresh vegetables, extend the shelf life At present, in order to keep the freshness of vegetables and increase the shelf life, fresh-keeping packaging is often used Among them, Zui is a widely used fresh-keeping package called map, which regulates the proportion of various gases in the package through the initial storage to ensure the inhibition of vegetable decay and deterioration Controlled atmosphere packaging is used to replace the air inside the packaging, and fill carbon dioxide, nitrogen, oxygen and other gases in a certain proportion, so as to change the surrounding environment of vegetables Among them, carbon dioxide can inhibit the growth and reproduction of most putrefactive bacteria and molds; oxygen can inhibit the growth of most anaerobic bacteria and maintain the respiratory metabolism of fresh vegetables; nitrogen, as an inert gas, can be used as a filling gas to prevent the package collapse caused by the gas escaping from the package, and has no absorption or chemical effect with the vegetables Therefore, in order to prevent the external air oxygen from affecting the gas composition of the internal environment of the packaging, the packaging materials with high oxygen barrier are needed How to monitor the barrier of packaging materials to oxygen, this paper will use the ox2 / 230 oxygen transmittance test system developed by Jinan Languang mechanical and Electrical Technology Co., Ltd to test the oxygen permeability of the air-conditioned packaging composite film Fig 1 fresh keeping packaging - air conditioning packaging 2 The current testing methods for oxygen resistance of plastic packaging are divided into isobaric method and differential pressure method, in which the isobaric method uses Coulomb electric quantity sensor to test the oxygen permeability of high barrier materials, with low detection limit, and can break through the inevitable impact of differential pressure method on plastic containers due to the pressure difference on both sides, so it can be extended to container testing At present, the national standard of GB / T 19789-2005 test method of coulometer for oxidation permeability of plastic film and sheet of packaging materials is followed in the test of oxygen permeability by isobaric method We will use the ox2 / 230 oxygen transmittance test system independently developed by Labthink Languang to test the oxygen transmittance of the sample in combination with this standard 3 The composite film of modified atmosphere packaging for fresh potato chips of a certain brand was tested 4 The test equipment used in this paper is the Labthink blue ox2 / 230 oxygen transmittance test system Fig 2 test principle of ox2 / 230 oxygen transmittance test system Oxygen molecules diffuse through the film to the other side of the high-purity nitrogen, which is carried by the flowing nitrogen to the internal Coulomb electric quantity sensor When the sensor absorbs each oxygen molecule, it can release four electrons The linear proportional relationship between the number of oxygen molecules and the number of electrons is used to calculate the oxygen permeability, which is not affected by the change of permeation concentration and sensor environment For packaging containers, high-purity nitrogen flows in the container, and air or high-purity oxygen surrounds the outside of the container 4.2 equipment parameter ox2 / 230 oxygen transmittance test system (Labthink blue light), with ultra-high precision, independent three chamber structure, can test three identical or different samples at the same time, the temperature control range is 15 ℃ ~ 55 ℃, the humidity control range is 0% RH, 35% RH ~ 90% RH, the film oxygen transmittance test range is (0.01 ~ 6, 500) cm 3 / M 2 · 24h, and can be extended to (0.07 ~ 6, 5000) cm 3 /m 2 ·24h 。 The system can also be extended to measure oxygen transmittance in a range of 0.0001 ~ 60cm 3 / (PKG · d) containers The system can connect 10 instruments in parallel and test 30 samples at the same time 4.3 scope of application: the instrument can meet the requirements of ISO 15105-2, GB / T 19789, ASTM d3985, ASTM f2622, ASTM f1307, ASTM f1927, JIS k7126-2, YBB 00082003 and other countries and international standards The standard can meet the oxygen barrier test of various soft plastic film, paper plastic composite film, coextrusion film, aluminum coating film, aluminum foil, aluminum foil composite film and various materials under different temperature and humidity environment, and can expand the oxygen permeability test of bottles, bags, cans, boxes and barrels made of various materials 5 During the test (1), the composite membrane samples were placed in 23 ℃ environment and kept in a desiccator for 48 hours After taking out, cut three samples with the diameter of 108 × 108 mm from the sample (2) Apply a layer of vacuum grease on the convex edge of the ventilating outdoor surface to avoid the grease on the middle disc of the cavity cavity (3) The three conditioned samples are respectively clamped on the vacuum grease applied on the three air permeability outdoor surfaces of the ox2 / 230 oxygen transmittance test system to avoid the sample wrinkle, and gently press to make the sample in good contact with the vacuum grease Close the ventilation chamber cover and tighten it (4) Add distilled water, open the system air source, and adjust the air source pressure as required According to the test requirements, add a proper amount of distilled water to achieve the required O2 and N2 humidity (5) Turn on the power and run the software (6) Set the test temperature, test parameters and start-up test Test parameters include equipment control parameters (test mode, test cycle times, test time, etc.) and sample parameters (type, area, thickness, etc.) (7) Click the start test option to start the test The instrument automatically records the test process data and calculates the final test results of Zui (8) Turn off the air supply and power supply 6 The results showed that the oxygen permeability of the three samples was 0.6103 cm 3 / m 2.24h, 0.6577 cm3 / m2.24h and 0.5914 cm3 / m2.24h, respectively The relative average deviation of the three samples was less than 10% The oxygen permeability of the sample is low, that is to say, the barrier of the external oxygen is good 7 Conclusion when monitoring the external oxygen barrier of fresh vegetable packaging with ox2 / 230 oxygen permeability test system, the results of high repeatability and reproducibility of oxygen permeability can be obtained, which can accurately reflect the barrier performance of fresh-keeping packaging materials The test equipment and standards used in this test are also applicable to the oxygen permeability test of other soft plastic composite membranes and containers In addition to the oxygen transmittance testing equipment, Labthink Languang can also provide you with testing equipment for various physical and mechanical properties of fresh-keeping packaging materials, such as shrinkage performance, tensile strength, sealing performance, etc for specific information about the equipment, you can visit Jinan Languang company or call for consultation The more you understand, the more you trust! Jinan Languang Electromechanical Technology Co., Ltd is willing to take this opportunity to enhance technical exchanges and cooperation with enterprises and institutions in the industry.
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