Numerical Simulation and Analysis of the Effect of Some Materials and Processing Parameters on the Gas Assisted Extrusion of Ultra-high Molecular Weight Polyethylene

After the numerical simulation of the isothermal flow of ultra-high molecular weight polyethylene melt in a gas assisted circular tube die,the numerical simulation and analysis were finished for the effect of such materials and processing parameters as entrance flow rate,relax time and zero-shear viscosity on the die swell rate,velocity distribution,die pressure drop and shear rate on the melt external face.Such analysis indicated that gas assisted extrusion was an effective technique for extrusion of ultra-high molecular weight polyethylene,which could overcome the difficulty occurring in the conventional extrusion of ultra-high molecular weight polyethylene.