Abstract: The progress in numerical design of extrusion dies was reviewed. In the early stage, when no slip condition was assumed, polymer extrusion process for PE-LLD, PE-HD, R-PVC, PP, ABS, PS, and rubber, were numerically simulated, based on which the extrusion dies of bar, tube, board, and structural section were optimally designed. Recently, effects of wall slip, die swell, and flow field were numerically studied. The improved design decreased die swell and enhanced the quality of the final products.

Key words: numerical simulation, extrusion die, wall slip, die swell