Influence of different slip conditions on the extruding process of PL A in counter-rotating twin screw
End curve is deduced and built in the method of relative motion for the 3 d model,after its meshing in Gambit software into the finite element simulation software Ansys,through the simulation process of motion are set up different slip boundary conditions to simulate the material in barrel inner surface and the screw on the surface of sliding phenome-non,The obtained physical field data were presented in the form of cloud chart and change curve by post-processing soft-ware for research and analysis.The volume flow rate of the extrusion process under different conditions was calculated,and the tracer particle method was used to explore the movement trajectory of the material in the flow channel.It is found that the wall slip condition is conducive to improving the pressure building ability and shear ability of the counter-rotating twin screw at the screw engagement,and the screw slip condition is conducive to the stability of the pressure in the flow channel during the extrusion process,so that the local high pressure phenomenon disappears and the service life of the ma-chine is prolonged.The shear capacity of the counter-rotating twin screw decreases at the gap between the screw and the barrel under both sliding conditions.Both slip conditions will decrease the extruding flow rate of the hetero-twin screw,resulting in a longer residence time of the material during extrusion.
twin screw extruderdifferent meshingpolylactic acidslip phenomenonfinite element analysis
万方数据
维普
