啮合异向双螺杆不同螺纹元件的数值模拟及其制备PP阻燃电缆的研究

Numerical Simulation of Different Screw Elements in A Counter-Rotating Twin Screw Extruder and Their Application in Preparation of Flame-Retarded PP

首先应用 POLYFLOW 软件对啮合异向双螺杆常规三头螺纹元件和 VCR(Various Clearances Rotors)元件进行流场模拟。通过对剪切速率场、压力场、平均剪切速率分布、平均压力分布、停留时间分布、最大剪切速率概率密度分布的对比研究,发现 VCR 元件和常规三头螺纹元件均有较好的混合能力。分别用带有这两种元件的螺杆组合对PP 阻燃材料进行挤出实验,制得了力学性能较好的样条,实验结果与模拟预期的结论基本一致。

The flow field of VCR and the triple screw dements in intermeshing counter-rotating twin screw extruder was simulated using POLYFLOW software. The shear rate field, pressure field, average shear rate distribution, average pressure distribution, residence time distribution, and density distribution of max shear rate distribution were compared and studied. It was concluded that both elements possessed good mixing ability. Flame-retarded PP samples were extruded using extruders of two screw configurations with the two elements. The samples exhibited good mechanical properties with the determined values being agreement with simulation results.