中文摘要：

微孔塑料连续挤出成型需要有更大的压力降速率,文章通过对毛细管口模的传统挤出和气辅挤出两种挤出进行模拟,对两种挤出中的压力场和剪切速率进行分析比较,研究气辅技术在微孔塑料连续挤出中对压力降速率的影响,从气泡成核和气泡核长大方面分析气辅技术在微孔塑料连续挤出中的应用价值.研究发现,口模内熔体的压力降取决于无滑移段长度,无滑移段和气辅段均对压力降速率无影响;气辅段熔体没有气泡核生成,气辅段气泡核只进行长大,气体的快速流动可以加快熔体的冷却,有利于控制气泡的长大,而且气辅技术可以减小挤出胀大,气辅技术在微孔塑料连续挤出中有一定的应用价值.

英文摘要：

Greater pressure drop rate was needed in microcellular plastic continuous extrusion, capillary die traditional extrusion and gas-assisted extrusion were simulated in this paper, and the pressure field and shear rate was compared, the influence of gas-assisted section to pressure drop rate in microeellular plastic continuous extrusion was studied, application value of gas-assisted technology used in mieroeellular plastic continuous extrusion was analyzed from the aspects of bubble nucleation and bubble nuclei grow up. The study showed that the meh pressure drop depended on no slip length, pressure drop rate was not effected by no slip section and gas-assisted section; no bubble nucleus was generated in gas-assisted section, the melt could be cooled more quickly by the rapid flow of gas, which was beneficial to control bubble grew up, and gas- assisted technology can reduce the extrusion swell, gas-assisted technology in the microeellular plastic continuous extrusion had certain application value.