Tsai Hsi-Hsun, Wu Shao-Jung, Liu Jia-Wei, Chen Sin-He, Lin Jui-Jung
Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan.
Research Center for Intelligent Medical Devices, Ming Chi University of Technology, New Taipei City 24301, Taiwan.
Polymers (Basel). 2022 Aug 25;14(17):3483. doi: 10.3390/polym14173483.
PVC injection molding has constrained temperature and shear rate owing to its temperature sensitivity and high viscosity, as well as its low conductivity. Many challenges are associated with the PVC injection molding process used for producing PVC fittings with a multi-cavity mold. Once filling imbalance occurs, the gates and/or runner of the mold should be changed by machine tools, which is time- and cost-intensive. Using Moldex3D and the Taguchi method, this study reveals an approach to eliminate imbalanced filling of multi-cavity molds for PVC injection molding. The injection rate optimization of the filling stage is successfully verified to reduce the imbalance. Furthermore, the temperatures of the molded PVC fittings are only slightly increased by the change in injection rate. The temperatures of fittings in the filling and packing are lower than the degradation temperature of PVC. This approach may help technicians to obtain pilot-run samples for the optimization of molding parameters and ensure degradation-free PVC molding.
由于聚氯乙烯（PVC）具有温度敏感性、高粘度以及低导电性，PVC注塑成型受到温度和剪切速率的限制。使用多腔模具生产PVC管件的PVC注塑成型工艺存在诸多挑战。一旦出现填充不平衡，就需要使用机床来更改模具的浇口和/或流道，这既耗时又成本高昂。本研究利用Moldex3D和田口方法，揭示了一种消除PVC注塑成型多腔模具填充不平衡的方法。成功验证了填充阶段的注射速率优化可减少不平衡现象。此外，注塑速率的变化只会使成型的PVC管件温度略有升高。填充和保压阶段管件的温度低于PVC的降解温度。这种方法可能有助于技术人员获得用于成型参数优化的试生产样品，并确保PVC成型无降解。
