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Comparison of Oxygen and Nitrogen Permeability of PE, BOPP and PET

Comparison of Oxygen and Nitrogen Permeability of PE, BOPP and PET
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Comparison of Oxygen and Nitrogen Permeability of PE, BOPP and PET - 1

Comparison of Oxygen and Nitrogen Permeability of PE, BOPP and PET Abstract: PE, BOPP and PET are three kinds of widely used packaging materials with different barrier properties. In this paper, we will use pressure difference method to measure the oxygen and nitrogen permeability of these three kinds of films with same thickness. The barrier properties of the three materials to oxygen and nitrogen are compared. The paper introduces the test principle, the instrument used, and provides reference for further studies of material permeability. Key words: PE, BOPP, PET, nitrogen permeability, oxygen permeability, differential pressure method, differential pressure method gas permeability tester, barrier performance Gas barrier performance is an important research field of thin film materials. According to different applications, gas barrier performance of thin film materials can be divided into barrier or preservation ability of oxygen, nitrogen, carbon dioxide, helium, water vapor, sulfur hexafluoride and other gases, due to the molecular diameter of gases, critical temperature, gas molecules and the different interaction between polymers in materials, the permeability of different materials to same gas is different, the permeability of the same materials to different gases is also different. Therefore, it is necessary to select suitable film materials according to the requirements of applications. For packaging materials, the primary task is to prevent oxidation of products. Nitrogen-filled packaging is an important measure to achieve this function. Therefore, the barrier performance of packaging materials to oxygen and nitrogen is important. In this experiment, three commonly used film materials - polyethylene (PE), biaxially oriented polypropylene (BOPP), polyethylene terephthalate (PET) were used as tested for their oxygen and nitrogen permeability. Differential pressure method is used to measure the permeability of different gases. The test process is based on ASTM D1434 Standard Test Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting. In order to test the gas permeability of three samples and improve the test efficiency, VAC-V2 differential pressure gas permeability tester with three independent chambers is used.

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Comparison of Oxygen and Nitrogen Permeability of PE, BOPP and PET - 2

The instrument is developed and produced by Jinan Lab s a d bthink Instrum ments. le ntial pressure method assumes that whe the volume and temper en e rature The principl of differen are c constant, the gas pressure is proportion to the gas volume. Th test chamb is divided into e nal he ber d uppe and lower parts by the clamped sa er e ample. The up pper chambe is filled wi test gas under er ith u certa pressure. The volume of the low chamber is fixed and known, and a low pressure ain e wer d nd envi ironment is fo ormed by vac cuum pumpin During th test, the ga in upper ch ng. he as hamber...

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Comparison of Oxygen and Nitrogen Permeability of PE, BOPP and PET - 3

Test results The oxygen transmission rate of PE, BOPP and PET were 1603.578 cm3/(m2·24h·0.1MPa)、 625.068 cm3/(m2·24h·0.1MPa) 、 16.953 cm3/(m2·24h·0.1MPa) respectively, the nitrogen transmission rate of PE, BOPP and PET were 403.658 cm3/(m2·24h·0.1MPa) 、 120.697 cm3/(m2·24h·0.1MPa)、2.487 cm3/(m2·24h·0.1MPa)respectively. In this paper, three kinds of samples and two kinds of gas permeability were tested by one test. The test efficiency and the cost performance ratio of the test instrument is high, and the test results are accurate. From the test results, the order of permeability to oxygen...

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