3C products are often designed for weight-reduction,thin walls and minimal size. as a result,in-mold decoration(IMD)has become an important manufacturing technology for 3C plastic parts in recent years. the in-mold decoration process combines injection molding and hot-film printing. in this process, plastic sheet or film is printed via a single or combination process to obtain the required graphic pattern. it 3D forming is required, the decorated film is inserted into a thermoforming mold. the formed film is then die-cut to fit into the mold before injection molding. the molding degins when the decorated film is placed into a mold cavity. molding resin is injected behind the film, and the film is then separated from the supporting layer by temperature and pressure and is tightly bounded to the polymer, forming a finished integral part