摘要
针对聚合物薄膜流延生产过程中出现的颈缩与哑铃边问题,采用仿真手段对薄膜流延过程进行非等温黏弹性模拟,研究拉伸比变化对薄膜的厚度与颈缩产生的影响,开展流延实验,验证仿真值与实验值的符合程度.结果表明:薄膜厚度变化表现为中心区域平稳,边缘变化较大,沿幅宽方向呈抛物线状,随着拉伸比增大,厚度逐渐减小;薄膜颈缩与拉伸比呈正相关,随着拉伸比增大,颈缩比例变化逐渐变缓;使用仿真模型得到薄膜厚度与颈缩的预测结果与实验结果整体变化趋势一致,误差值均小于5%,为后续薄膜流延生产工艺参数优化提供参考依据.
Abstract
In order to solve the problems of necking and dumbbell edge in film casting production,the non-isothermal viscoelastic simulation of the film casting process was carried out by simulation method.The influence of the change of draw ratio on the thickness and necking of the film was studied.The casting experiment was carried out to verify the consistency between the simulated value and the experimental value.The results showed that the thickness of the film was stabled in the center area,the edge changed greatly,which was parabolized along the width direction and gradually decreased with the increase of the draw ratio.There was a positive correlation between film necking and draw ratio,the change of necking ratio gradually slowed down with the increase of draw ratio.The prediction results of film thickness and necking obtained by using the simulation model are consistent with the overall change trend of the experimental results.The error values were less than 5%,which provided a reference for the optimization of subsequent film casting production process parameters.
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