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首页> 外文期刊>Journal of Plastic Film & Sheeting >Modeling and experimental analysis of squeeze flow of sealant during hot bar sealing and methods of preventing squeeze-out
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Modeling and experimental analysis of squeeze flow of sealant during hot bar sealing and methods of preventing squeeze-out

机译：热棒密封过程中密封胶挤压流动的建模与实验分析及防止挤压的方法

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摘要

Excessive pressure and temperature during hot bar sealing of flexible packaging films can result in seal failure due to squeezing out of the sealant from the seal area. A model is developed that shows the amount of squeeze-out increases with increasing seal bar pressure, seal temperature (by lowering the viscosity of the sealant), sealing dwell time, film thickness, and decreasing seal bar width. Validation experiments qualitatively agree with the model predictions. Both the model and experimental results show that the rheology of the sealant plays a significant role in preventing squeeze-out; high viscosity at low shear rates favor less squeeze-out. The work shows that under normal sealing conditions, squeeze-out is not substantial. Avoiding excessive temperature or pressure is critical to minimizing squeeze out to ensure good sealing performance.
机译：在柔性包装薄膜的热压条密封过程中，过高的压力和温度可能会由于从密封区域挤出密封剂而导致密封失败。开发了一个模型，该模型显示出随着密封杆压力的增加，密封温度（通过降低密封剂的粘度），密封停留时间，薄膜厚度以及密封杆宽度的减小而增加的挤压量。验证实验在质量上与模型预测一致。模型和实验结果均表明，密封剂的流变学在防止挤出方面起着重要作用。在低剪切速率下的高粘度有利于减少挤出。这项工作表明，在正常的密封条件下，挤压并不明显。避免过高的温度或压力对于最大程度地减少挤压以确保良好的密封性能至关重要。

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