The initial temperature of the preform has an important influence on the stretch and blowing step of the process to produce PET bottles. A complete 3D modelling of the heat part of the stretch blow molding machine including meshing is a long and complex task. Solving Navier Stokes equation coupled with the thermal problem takes more than one week using ANSYS/Fluent software. The numerical simulation of infrared (IR) heating taking into account the ventilation effect is very time-consuming. This work proposes a simplified approach to achieve quickly the numerical simulation in order to have an estimation of the temperature distribution in the preform. In this approach, the IR heating flux coming from IR lamps and the ventilation model are calculated in a semi analytical way and are applied as the boundary conditions of the simulation in COMSOL where only the preform is meshed. This approach is validated by comparing our numerical results with the experimental temperature distribution of PET preform.

瓶坯的初始温度对生产 PET 瓶的拉伸和吹塑步骤有重要影响。包括网格划分在内的拉伸吹塑机热部件的完整 3D 建模是一项漫长而复杂的任务。使用 ANSYS/Fluent 软件求解 Navier Stokes 方程和热问题需要一周以上的时间。考虑通风效果的红外线 (IR) 加热的数值模拟非常耗时。这项工作提出了一种简化的方法来快速实现数值模拟，以便估计预成型件中的温度分布。在这种方法中，来自 IR 灯的 IR 热通量和通风模型以半解析方式计算，并在 COMSOL 中用作仿真的边界条件，其中仅对预成型件进行网格划分。通过将我们的数值结果与 PET 瓶坯的实验温度分布进行比较，可以验证这种方法。