Ink does not light discoloration and fading ink reason in sunlight exposure, it will be different degrees of color and brightness changes, the absolute light without changing the color of the ink is not, Dongguan bag color card printing in strong sunlight effect all ink colors will produce different degrees of change. This change can be divided into two types. 1. Fading: In the role of solar ultraviolet ink poor light, lost its bright color, the color becomes lighter gray. Especially in light color and four-color ink printing when registering yellow and red two colors fade faster than blue and ink fade slowly. 2. color: black ink and print fade contrary, under the effect of daylight color change was darker, and the color is changed, people called this change color. Offset principle into water and waterless offset two kinds. Offset is water on a flat plate, the use of oil and water-immiscible, mutually exclusive rules so that the graphic part of the blank part of the plate in the same plane were lipophilic, hydrophilic, and ultimately Photo transfer. Because water offset printing ink and water acting on the same surface, so water must ensure that the balance between the offset. Waterless offset is on a flat plate, with ink-repelling silicone rubber layer as a blank part of the plate, printed with a special ink. Offset and water is different, waterless canceled fountain solution to improve operational performance. In theory the principle of gravure offset printing is not so complicated, but the ink is transferred directly from the gravure printing plate to the substrate to complete the printing. The difference is the color card printing, gravure printing process using a squeegee device color card printing plant in Dongguan, in addition to the gravure plate graphic part is always lower than the blank section. Process offset and gravure printing have their relatively fixed areas such as sheetfed offset, gravure printing plastic products, but calendars, high-end color periodicals, paper packaging products is the focus of contention between the two. Offset and gravure have their own characteristics in the production process, are summarized below. Offset: ① suitable for printing, design content products are often short-change; ② printing for short period, especially for time-restricted products, such as newspapers; ③ small footprint, low capital investment, with less equipment. Gravure: ① high resistance to printing for long runs Dongguan color card printing quotes can be repeatedly printed; ② stable print quality and repeatability; ③ to achieve double-sided printing reel material, to achieve special materials printing, such as plastic, printing, printing and other metal materials; ④ short inking ink road, the principle is simple, easy to operate Dongguan bag color card printing _ _ color card printing color card printing by the Dongguan City, often beyond packaging products factory provided. Dongguan Chang-ping beyond packaging products plant (www.dgcyp.com) strong, credible, in Dongguan, Guangdong paper printing industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead beyond printers and you hand into the brilliant, for a better future!