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首页> 外文会议>European PLACE conference >Using Computational Fluid Dynamics (CFD) to analyse the limits of the secondary layer thickness in multi-layered polyester film processes
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Using Computational Fluid Dynamics (CFD) to analyse the limits of the secondary layer thickness in multi-layered polyester film processes

机译：使用计算流体动力学（CFD）分析多层聚酯薄膜工艺中的二级层厚度的限制

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Polyester based multi-layered films (MLFs) are films made up of several different polymer layers, with applications including touch screens, smart cards and food packaging. The use of multiple layers gives increased functionality compared with mono-layered products. Such MLFs are formed when different low Reynolds number polymer melt flows come together in a process known as coextrusion. The main coextrusion geometries used to achieve these structures involve an injector block linked to a die or a multi-manifold die. As the secondary layer gets thinner, it becomes difficult to obtain an even layer distribution across the MLF width. The finite volume based Computational Fluid Dynamics software STAR-CCM+ is used to evaluate the layer control capability of the two technologies, supplementing and guiding experimental trial work and offering an improved understanding of the complex interaction of rheology, melt and wall temperatures and flow geometry with layer thickness control. Coextrusion structures typical of DTF operation are created and meshed using the software fluids entering with initially identical physical properties, based upon experimental rheological data on polyester melts. The multi-manifold die system is found to be more robust at controlling thin multi-layered films uniformly. This result can be attributed to the simpler uni-directional multi-layer flow generated in the die. However based upon the experimental evidence, some aspects of the poorer injector block performance are attributed to insufficient mesh resolution and the thinnest part and the outlet of the end fed die for such thin layers. Consideration is given to future experimentally verifying the simulations.
机译：基于聚酯的多层薄膜（MLF）是由几种不同的聚合物层组成的薄膜，包括触摸屏，智能卡和食品包装的应用。与单层产品相比，使用多层的使用增加了功能。当不同的低雷诺数聚合物熔体流动在称为共挤出的过程中，形成这种MLF。用于实现这些结构的主要共挤出几何形状涉及连接到模具或多歧管模具的喷射器块。由于次级层变薄，难以在MLF宽度上获得均匀的层分布。基于有限的基于体积的计算流体动力学软件Star-CCM +用于评估两种技术的层控制能力，补充和指导实验试验工作，并提高了对流变学，熔体和墙面温度和流动几何的复杂相互作用的理解层厚度控制。基于聚酯熔体的实验流变数据，使用进入最初相同的物理性质的软件流体来创建和啮合DTF操作的典型COExtrusion结构。发现多歧管模具系统在均匀地控制薄的多层薄膜时更加稳健。该结果可以归因于模具中产生的更简单的单向多层流。然而，基于实验证据，较差的喷射器块性能的一些方面归因于网格分辨率不足，并且最薄的部分和端部供给薄层的端口。考虑未来的实验验证模拟。

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