Investigation of the resistance welding of multilayers aluminum-coated polymer complexes used as envelopes of vacuum insulation panels

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• 作者：S. Marouani ; ^{sofiene.marouani@umons.ac.be}
• 关键词：A. Multi-materials ; D. Welding ; H. Failure analysis
• 刊名：Materials and Design
• 出版年：2012
• 期刊代码：56_02613069
• 类别：ms
• 出版时间：April, 2012
• 卷：36
• 期：Complete
• 页码：546-556
• 文件大小：2042 K

摘要

Vacuum Insulation Panels (VIPs) are thermal insulators consisting of a core material enveloped by a high barrier film or envelope required to maintain the vacuum.

Multilayered aluminum-coated polymer complex are the common barrier envelopes of VIPs used as high performance thermal insulation in building applications. The multilayer complex is sealed to maintain the vacuum for a long period of time. From a mechanical and barrier properties standpoint, sealed edges represent the weak point of the envelope assembly. This paper investigates the influence of sealing parameters on the properties of the weld. T-peel and tensile tests in combination with Optic Microscopy observations were used to characterize the heat seals. A minimum seal initiation temperature of 115 掳C was identified for the studied complex. Peel strength increased sharply to reaching a maximum value at (140 掳C-5 s), which considered as optimum temperature-time couple. Above and beyond these values, a gradual decrease was observed and microscopic images indicate the appearance of roll generated by the expelled polymer mass from the center to the edges of the weld which strongly impacts the morphology of the welded area.