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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Back-layer on seal performance of multilayer polyethylene-based sealant films
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Effect of Back-layer on seal performance of multilayer polyethylene-based sealant films

机译：背层对多层聚乙烯基密封膜密封性能的影响

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摘要

This work studies effects of back-layer materials, thickness of sealant layer, and sealing condition on seal performance of multilayer polyethylene-based films. Multilayer films with back-layers of high-density polyethylene (HDPE), or low-density polyethylene (LDPE), or linear low-density polyethylene (LLDPE) were produced with different thicknesses of the metallocene layer. It was found that increasing the thickness of the metallocene layer improved hot tack properties. In addition, films with back-layers of LLDPE or LDPE showed higher hot tack strength compared to those with HDPE back-layer. Increasing sealing temperature reduced significantly the hot tack strength and its dependency on metallocene layer thickness. It was found that increasing delay time after sealing, before peeling test, increased hot tack strength, but the rate of hot tack evolution and the type of peeling behavior were considerably affected by the type of back-layer material. The effect of dwell time was also examined, and it was observed that increasing dwell time in the studied range did not affect the hot tack evolution. The mechanisms involved in the development of hot tack evolution were discussed, and it was shown that the back-layer effects can be explained by bulk viscoelastic energy dissipation theory.
机译：本文研究了封底材料、封层厚度和密封条件对多层聚乙烯薄膜密封性能的影响。用不同厚度的茂金属层制备了具有高密度聚乙烯（HDPE）、低密度聚乙烯（LDPE）或线性低密度聚乙烯（LLDPE）的多层膜。研究发现，增加茂金属层的厚度可以改善热粘性能。此外，与具有HDPE背层的薄膜相比，具有LLDPE或LDPE背层的薄膜显示出更高的热粘性强度。提高密封温度显著降低了热粘强度及其对茂金属层厚度的依赖性。研究发现，在剥离试验之前，增加密封后的延迟时间，可提高热粘强度，但热粘演变速率和剥离行为类型受背层材料类型的显著影响。还研究了停留时间的影响，观察到在研究范围内增加停留时间不会影响热粘性的演变。讨论了热粘弹性发展过程中所涉及的机制，并表明背层效应可以用体粘弹性能量耗散理论来解释。

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