Numerical analysis of flow mark surface defects in injection molding flow

Abstract

An investigation of the stability of injection molding was done in order to elucidate the mechanism of flow mark surface defects, using a transient finite element method. Testing and development of the numerical method for this complex flow was performed using a one mode exponential Phan-Thien-Tanner model. The results showed that for strain hardening rheologies, an instability was observed in the channel flow far from the interference, in agreement with the performed calculations.