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An investigation of melt temperature development in injection molding and extrusion.

机译：研究注塑和挤出中熔体温度的变化。

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This work focuses on understanding the melt temperature development in injection molding machines and extruders. An experimental program was undertaken to measure melt temperatures and pressures in real time and study them as functions of machine and material parameters. Melt temperature was found to be most sensitive to screw speed, back pressure, injection speed and polymer rheology. It was also determined that an injection molding process never approaches the steady state of an extrusion process. The experimental technique developed was also able to characterize melt temperature and melt pressure within a screw channel.; Application of the experimental program for melt temperature development was studied in reference to recycling. Resins with different percentages of regrind were molded. Two control strategies were used to maintain constant part properties in the presence of changing feedstock.; Mathematical models were developed to predict the temperature rise during melt conveying. The models used were the existing extrusion analyses, as well as an alternative melt conveying analysis. This alternate melt conveying analysis was also extended to the solids conveying section. The predictions of the alternate conveying analyses were in agreement with data collected in-house as well as literature data.
机译：这项工作的重点是了解注塑机和挤出机中熔体温度的变化。进行了一个实验程序来实时测量熔体温度和压力，并将其作为机器和材料参数的函数进行研究。发现熔体温度对螺杆速度，背压，注射速度和聚合物流变学最敏感。还确定注射成型过程永远不会接近挤出过程的稳态。开发的实验技术还能够表征螺杆通道内的熔体温度和熔体压力。结合回收利用，研究了将实验程序用于熔体温度发展的应用。模制具有不同百分比的再生料的树脂。在存在变化的原料的情况下，使用了两种控制策略来保持恒定的零件性能。开发了数学模型来预测熔体输送过程中的温度升高。使用的模型是现有的挤出分析以及替代的熔体传输分析。这种替代的熔体输送分析也扩展到了固体输送段。替代输送分析的预测与内部收集的数据以及文献数据一致。

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