材料科学
流变学
复合材料
造型(装饰)
粘度
焊缝
流变仪
毛细管作用
熔体流动指数
聚合物
牛顿流体
机械
共聚物
焊接
物理
作者
Wangqing Wu,Baishun Zhao,Fan Mo,Binbin Li,Bingyan Jiang
标识
DOI:10.1016/j.matdes.2022.111266
摘要
Both scale and temperature field effects have a considerable impact on polymer melt viscosity during thin-wall/micro injection molding. In this work, an in-line rheological test with similar dynamic test conditions to thin-wall/micro injection molding was adopted to further analyze the rheological properties and improve the simulation accuracy. An injection mold with rectangular slit cavity and storage region was designed to obtain a steady flow. The effects of factors such as the cavity size, viscous dissipation and melt temperature on polymer melt viscosity were studied. The results demonstrate that the injection molding conditions have a significant influence on the in-line rheological properties. When the cavity thickness (h) was 0.5 mm, the average percentage reductions of viscosity were 8.86 % (200 to 220 °C) and 4.07 % (220 to 240 °C) as the melt temperature rose. They were 57.13 % (200 to 220 °C) and 38.86 % (220 to 240 °C) when the cavity thickness was reduced to 0.2 mm. The test results show that the average prediction errors of pressure drop based on the capillary rheometer viscosity and in-line viscosity are 29.78 % (die: 5/0.2 mm) and 16.61 % (slit:h = 0.2 mm), respectively. In-line rheological viscosity shows potential for application in mold flow simulation.
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