A Study on Sink Mark of Injection Molded Products

사출성형부품의 싱크마크에 관한 연구

The injection molding process has been developed as a very important technology for the automotive and electric industries in recent years. But, in the injection molding products with rib-web structures, partial deformation by thermal volumetric shrinkage called Sink Mark, is occurred. In this study, to make explicitly characteristics of sink mechanism, an experimental approach was taken by using multi T-shaped mold cavity and FEM simulation. As a result, pressure on the packing process and the rib thickness are the most effective on sink mark depth. On the other hand, melt temperature has no effect on sink mark depth fot the same rib thickness.