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Modeling and simulation of film blowing process.

机译：吹膜过程的建模和仿真。

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摘要

Film blowing process is a flexible mass production technology used for manufacturing thin polymeric films. Its flexibility in using an existing die to produce films of different width and thickness, just by controlling process conditions such as, extrudate velocity, excess pressure, and line speed, makes it an attractive process with less capital investment. Controlling the process conditions to obtain a stable bubble, however, is not a trivial task. It is a costly trial and error procedure, which could result in a large wastage of material and other resources. Hence, it is necessary to develop methods to simulate the process and design it using numerical experiments. This important need of the industry defines the objective of this work. In this dissertation, a transient, axisymmetric, nonisothermal, viscoelastic model is developed to simulate the process, and it is solved using finite element method. Material behavior of polymer melt is described using a modified Phan-Thien-Tanner model in the liquid-like region, and anisotropic Kelvin-Voight model in the solid zone, and the transition is modeled using a simple mixture theory. Crystallization kinetics is described using a modified Avrami model with factors to account for the influence of temperature and strain. Results obtained are compared with available experimental results and the model is used to explore stability issues and the role of different parameters. Software developed using this model comes with a GUI based pre- and post-processor, and it can be easily adapted to use other constitutive models.
机译：吹膜工艺是用于制造聚合物薄膜的灵活的批量生产技术。仅通过控制挤出速度，过压和生产线速度等工艺条件，就可以灵活地使用现有模具生产不同宽度和厚度的薄膜，这使其成为具有吸引力的工艺，所需的资本投入更少。然而，控制工艺条件以获得稳定的气泡并不是一件容易的事。这是一个代价高昂的反复试验，可能导致材料和其他资源的大量浪费。因此，有必要开发一些方法来模拟该过程并使用数值实验进行设计。行业的这一重要需求定义了这项工作的目标。本文建立了一个瞬态的，​​轴对称的，非等温的，粘弹性的模型来模拟该过程，并用有限元方法对其进行了求解。使用改进的Phan-Thien-Tanner模型在液状区域中描述了聚合物熔体的材料行为，并在固体区中使用了各向异性Kelvin-Voight模型，并使用简单的混合理论对转变进行了建模。使用修改后的Avrami模型描述了结晶动力学，该模型具有考虑温度和应变影响的因素。将获得的结果与可用的实验结果进行比较，并使用该模型探索稳定性问题和不同参数的作用。使用此模型开发的软件带有基于GUI的预处理器和后处理器，并且可以轻松地修改为使用其他本构模型。

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