Correlation amongst gas barrier behaviour,temperature and thickness in BOPP films for food packaging usage: A lab-scale testing experience |
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| Affiliation: | 1. Department of Electrical, Electronic, and Information Engineering “Guglielmo Marconi”, University of Bologna, Viale Risorgimento 2, Bologna, 40136, Italy;2. Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, Via Terracini 28, Bologna, 40131, Italy;3. Department of Industrial Chemistry “Toso Montanari”, University of Bologna, Viale Risorgimento 4, Bologna, 40136, Italy;1. Department of Polymer Science & Engineering, Hannam University, Daejeon 34054, Republic of Korea;2. Underground Solutions Inc., Poway, CA 92064, USA;3. Ansco Inc., Daejeon 34051, Republic of Korea;1. College of Mechanical Engineering, Anhui University of Science and Technology, Huainan 232001, China;2. Institute of Plastic Machinery and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;3. Interdisciplinary Research Center (IRC) in Polymer Engineering, School of Engineering, Design, and Technology, University of Bradford, Bradford BD7 1DP, West Yorkshire, United Kingdom |
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| Abstract: | Permeability of gases in polymers depends strongly upon the polymer structure, the gas type, as well as the conditions of temperature and film thickness. The in-use temperature and thickness of the polymer membrane can play the most important role on preservation and prolongation of food shelf-life. In this work the gas transmission parameters of six Bi-axially Oriented Polypropylene (BOPP) films were investigated as a function of temperature, gas type and thickness. O2, CO2, N2, N2O, C2H4, Air (79%N2/21%O2) and Modified Atmosphere (MA) of 79%N2O/21%O2 were used as test gas. In order to understand the kinetic of the process, by the activation energy determination, samples were tested at a different temperature, from 10 °C to 40 °C. Gas Transmission Rate (GTR), solubility (S) and diffusion (D) relationship was investigated. The gas/thickness/temperature correlation was reflected in the obtained perm-selectivity ratios and a good linear correlation was found only at 23 °C. Deviations recorded were attributed to temperature fluctuations. Gas transmission process follows the Arrhenius model while the solubility/diffusion process shows consistent deviation, correlated to the temperature and the thickness of the film. By Differential Scanning Calorimetry (DSC) a different crystallinity percentage was recorded, whose influence was evidenced only in the sorption/diffusion processes. The melting temperature remained unchanged. FT-IR Spectroscopy was also carried out to confirm the morphology. |
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| Keywords: | Gas-barrier behaviour Temperature Thickness BOPP films Modified atmosphere packaging |
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