A 2-D transient finite element model of two-layer coextrusion has been developed with the Criminale-Erikson-Filbey (CEF) constitutive equation to study the problem of interfacial instability. Experiments were done with LDPE 132I~(TM) (Dow Chemical Co.) in a coat-hanger die using two extruders, under well controlled temperature and flow conditions, where stable and unstable interface profiles were observed. Cross-sections of the frozen heel were taken and compared to transient simulations by quantitatively examining the position of the interface between the two layers.
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机译：双层共挤的二维瞬态有限元模型已经与“erikson-filbey（CEF）构成方程”组成方程开发，以研究界面不稳定性问题。使用两个挤出机，在良好控制的温度和流动条件下，在涂层悬挂器模具中用LDPE 132i〜（TM）（Dow Chemical Co.）用LDPE 132i〜（TM）（Dow Chemical Co.）进行了实验，其中观察到稳定和不稳定的界面轮廓。通过定量检查两层之间的界面的位置，采取冷冻鞋跟的横截面，并与瞬态模拟相比。
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