A Study of Warpage and its Mechanism in Sequential Overmolding

Sequential overmolding is one of the great methods to fabricate the modern injection products. Due to its complicated nature and the unclear physical mechanism, trial-and-error method can not realize and manage the warpage and its mechanism effectively. In this study, various parameters including product geometrical effect and material selection have been conducted both theoretically and experimentally. Results showed that the product geometries and molded materials will affect the warpage of final products significantly. It can be the good guidelines to help people understand the mechanism and make the proper design for fabricating the modern multi-component molding products.