Tin boxes and tin cans are favored by businesses and consumers for their exquisite printing effects. They are mainly used in the food industry, cosmetics industry, and pharmaceutical industry. The printing of tin cans is an extremely important and complicated step in the entire can making process, from color separation, plate printing, proofing, printing to printing completion, although there are many similarities to the process of printing paper products. However, because of the special nature of the materials, the operation of each process is different. The following is a brief talk about the process design process and control points of tinplate printing.
1. Color separation：
Color separation is a very important link in the printing of iron boxes and tin cans. At present, most of the domestic iron printing machines are monochrome and two-color machines. Traditional color separation methods are used. It is easy to bury hidden dangers for the subsequent printing of iron. In order to avoid this situation, professional printing iron plants will use the spot color, which is what we call Pantone color, to replace the multi-color overprint.
2. Layout setting：
Before printing the tin box and tin can, you should make a reasonable layout according to the size of the knife edge to confirm the best printing method to achieve the best printing effect. Depending on the product's requirements for color difference, the size of the iron material, and funding, there will be different arrangements.
3. Printing：
Because the tin cans are offset printed and printed through film, they must be printed. The same pictures can be grouped into negative or positive pictures according to the determined product drawings, and the plates are exposed by continuous exposure. In this way, dozens of identical images can be printed on one sheet at the same time. The PS version is used in the production process.
4. Printing：
The printing of the tin box and tin can is completed by the dot conformation using the characteristics of ink and ink incompatibility. Printing is divided into four colors and spot colors. Since most domestic iron printing machines are single-color and two-color machines, if printing four colors, it needs to be printed at least twice. If it is a spot color, a few spot colors are printed. Times. If the four colors and spot colors exist in the design, print the four colors first, and then print the spot colors.
5. Proofing：
Generally speaking, the redesigned tin cans are proofed before mass production. The proofing is not only for the inspection of the film and design content, but also for the pre-judgment and placement of the quality of the tin cans before mass production. OK, so this money can never be saved. It is worth mentioning that even if the printing effect is confirmed when proofing, the two will still have a certain color difference when printing in batches. This is because the tin box and tin can proofing is printed on a small printing press, and the large-scale printing iron is produced in batches. Line printing, but the color difference will be controlled within the acceptable range.
