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The Temperature Factor and New Trends for the Sealing Performance Test of Flexible Packages

The Temperature Factor and New Trends for the Sealing Performance Test of Flexible Packages
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The Temperature Factor and New Trends for the Sealing Performance Test of Flexible Packages - 1

The Temperature Factor and New Trends for the Sealing Performance Test of Flexible Packages Abstract: this article introduces the sealing performance test methods of flexible packages and the critical factors. Meanwhile, a detailed introduction of new test technological progress and applications is put forward as per market demands. Key Words: leakage, sealing, package, storage, broken package There are many indexes to be considered when choosing flexible packaging forms and materials. For example, the barrier property of package against light and gas, the volume of headspace, the costs for package, transportation and storage, the convenience of application and the environmental- friendly properties of the materials, etc., should all be considered. The comprehensive evaluation of those indexes is the foundation for the choice of the best packages. However, the sealing performance tests, or such tests with specimens that have undergone simulation tests as aging tests and vibration tests, etc., is the veto of flexible package evaluation. Therefore, sealing performance is the premise for the realization of package functions. It’s also the comprehensive embodiment of matching performance between the flexible packaging materials themselves, and with the mechanical, thermological and optical properties of the choiced packaging forms. The inferior sealing performance packages would lead to content deterioration owing to gas or liquid transmission through the packages, and would probably lead to pollution to the environment and the surrounding subjects. As to functional packages, the leakage would lead to failure of the packaging functions and losses to the users. 1Sealing Performance Testing Methods for Flexible Packages There are commonly two flexible sealing performance testing methods, namely, the positive pressure method and the negative pressure method. The positive pressure method fills the specimen with gas to increase the inner pressure, and determines leakage according to the changes of the inner pressures. The negative pressure method puts the specimen into the water of the testing cell, and produces a pressure difference inside and outside the specimen by vacuum pumping the cell. Observe gas leakage or water permeance of the specimen so as to determine whether the sealing flaw really exists. Sealing performance test data is the important basis for test condition setup and result evaluation of the simulation tests, such as product storage, stack and vibration, etc. Comparing with other test items, the most outstanding characteristic of sealing performance test is the varied kinds of test subjects that it applies to. The test subjects of other tests are usually singular. For example, the tensile test can only test films and sheets, the flex durability test can only test films, and headspace test can only test packages. Yet, sealing performance tests can not only test various packages, but the semi-finished packages as well. The specimen can be a finished package, or a sampling from any stage of the logistic process. Meanwhile, with accessories, more subjects with more sizes and shapes can be tested. 2. The Influencing Factors for Flexible Package Sealing Performance Test The sealing performance test is the comprehensive embodiment of matching performance between the flexible packaging materials themselves, and with the mechanical, thermological and optical properties of the choiced packaging forms. The sealing performance of flexible packages is directly influenced by external forces, temperature changes and ray radiation, etc. Many factors can not influence the packages directly, but can lead to decrement of material strength and heat-seal layer fastness, as well as the exudation of additive to the flexible packaging materials, all of which come to affect the sealing performance of flexible packages. However, it should www.labthinkinternational.com.cn

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The Temperature Factor and New Trends for the Sealing Performance Test of Flexible Packages - 2

be emphasized that different influencing factors would result in different influences, and if the actual influencing result of each factor is to be analyzed, the workload and costs would be greatly increased. Therefore, it is not realistic to take all the influencing factors into consideration. Only those influential ones should be emphasized, or regarded as one of the test conditions. Otherwise, the practicability of the test results would be limited. Previous tests indicate that temperature is the key factor for sealing performance of flexible packages during storage and transportation....

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The Temperature Factor and New Trends for the Sealing Performance Test of Flexible Packages - 3

Now, the positive pressure method instruments can accurately obtain max. burst resistance pressure of flexible packages, as well as the max. lasting time before breakage under certain pressure. Besides, the sealing performance tests of specific parts can be realized with the help of fixtures, which can effectively improve the practicability of the test data and analyze the vulnerable segments in the package structure so as to provide basis for structural improvement, material selection and more accurate critical breakage conditions for stack, storage, transportation, impact and many other...

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