Investigation of Co-Extrusion Using a Coat Hanger Die with Different Feedblock Cross-Section

Key Engineering Materials Pub Date : 2024-02-09 DOI:10.4028/p-rctkv4

Nurdaulet Sharipkhan, Omonini Clifford, Asma Perveen, Di Chuan Zhang, Dong Ming Wei

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Abstract

When using the coat hanger die method for co-extrusion, the biggest challenges often involve maintaining the uniformity of the velocity distribution at the outlet of the die and ensuring the stability of the interface plane. This paper investigates the effect of different cross-section of feed channels connected to the coat hanger die on the velocity and pressure distribution of the flow at different parts of the die. Co-extrusion of LLDPE (Linear Low Density Polyethylene) and HDPE (High Density Polyethylene) polymers is simulated using ANSYS software 2020 R2 for coat hanger die design with rectangular and circular cross-sections inlet geometry; the results are compared for Carreau-Yasuda model to observe the result differences between rectangular and circular coextrusion channels connected to coat hanger die. Our results showed that rectangular cross-section feedblock generated higher values for pressure in comparison with the pressure generated by the circular cross-section feedblock. The maximum velocity generated in the circular feedblock is lower than that generated in the rectangular one, nevertheless there is more uniformity in velocity distribution in circular than rectangular cross-section.

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使用不同进料块横截面的衣架模具进行共挤的研究

在使用衣架模具法进行共挤时，最大的挑战往往是如何保持模具出口处流速分布的均匀性，以及如何确保界面平面的稳定性。本文研究了与衣架模相连的不同横截面进料通道对模具不同部位流速和压力分布的影响。使用 ANSYS 软件 2020 R2 模拟了 LLDPE（线性低密度聚乙烯）和 HDPE（高密度聚乙烯）聚合物的共挤，设计了矩形和圆形截面进料口几何形状的衣架模；比较了 Carreau-Yasuda 模型的结果，以观察与衣架模相连的矩形和圆形共挤通道的结果差异。结果表明，与圆形截面进料块产生的压力相比，矩形截面进料块产生的压力值更高。圆形进料块产生的最大速度低于矩形进料块，但圆形截面的速度分布比矩形截面更均匀。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Key Engineering Materials

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