In general, 3C products (computer, communication and consumer electronics) are always use plastic to produce enclosures. There are two reasons that people usually choose. First, cost is lower and construction is firmer. Second, weight of plastic is lighter than all the other metals. Because of both reasons, plastic are always be an enclosure of 3C products. Although plastic possess those important advantage, sense of quality is the only one thing it haven’t. In order to conquer this point, printing technology will be a key of this point. All products have an exclusive design, printing technology application are not only in mold shaping and printing procedure, but also present characters and logo outward is general.The Screen Printing, Pad Printing and Transfer Printing are usually performed on external design. The following introduction is combine Painting and Printing Technology.