Abstract: The interior trimming panels of automotive doors are mostly in a slender form. Little scraps,small amount of warping panels and no welded lines are the key index which the users pay most attention in injection molding production. Taking the A-pillar panel in family car as example, adopts the Moldflow software to carry out the numerical simulation flow analysis on 3 different processing programs of injection molding. Finds out using the material PP-TD20 in hot runner injection molding can meet the productive and technical requirements of little scarps, small amount of warping panels and no welded lines. The practice proved that the stimulated data provide references for real mold design and injection molding production.

Key words: automobile decoration board, Moldflow, injection mold, hot runner, numerical simulation