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, aplastic 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.