Abstract: According to the flow character of polymer melt in cavity, the molding mechanism in the rapid heat cycling molding(RHCM) was studied.How to enhance the reproductive ability to cavity,eliminate processing defects, such as weld mark, dark mark, flow mark, sliver mark, fibre on surface,and how to eliminate the difference in color were discussed.It was found that just because of the high melt temperature the polymer melt could flow smoothly and joins fully, resulted in lower shrinkage and thus ensured the higher quality of the parts.

Key words: rapid heat cycling molding, high-gloss surface part, process mechanism, microstructure