不同进气角度对片材气辅挤出成型的影响

Effect of Different Air Intake Angles on Gas-assisted Extrusion of Sheet Polymer

采用气辅助挤出成型技术,分别以垂直进气和平行进气2种方式进行了片材挤出实验,根据流变学原理建立了片材三维气辅挤出模型,利用有限元方法对0°、15°、30°、45°、60°、90°6个不同进气角度下熔体在口模内的挤出过程进行了数值模拟。结果发现,改变进气角度对片材挤出制品造成了不同的影响,进气角度为90°时熔体在口模内的变形程度最大,随着进气角度的减小,熔体的变形程度减小;15°~30°的进气角度对聚合物片材气辅挤出成型最有利。

In this work,a sheet polymer extrusion experiment was conducted on the basis of the vertical and parallel air intake separately though a gas-assisted extrusion technology. A three-dimensional model was established based on rheological principles,and a finite element method was applied to the numerical simulation of gas-assisted extrusion molding under the different air intake angles of 0°,15°,30°,45°,60° and 90°. The experimental results indicated that a change in air intake angle generated different effects on the gas-assisted extruded products. There was a largest degree of deformation in the melt in the die under an air intake angle of 90°. As the air intake angle decreased,the melt deformation was weakened. The air inlet angle of 15°~30° is most beneficial to the gas-assisted extrusion molding of polymer sheets.