Is tinplate printing difficult?

Tin box as a member of the packaging industry, its printing process is difficult in the end?

-->Printing principle

First of all, we need to understand the principle of tinplate printing.Tinplate printing utilize the principle of water & ink repulsion physical properties, with the printing pressure, to print plate graphic transfer to the tinplate by rubber cloth.It belongs to the principle of offset lithography. Because tinplate has special physicochemical properties as well as the reprocessing performance of printed matter, its printing process is quite different from that of ordinary offset printing.

-->Printing ink request 

The ink is required to have better adhesion and mechanical properties.In order to improve ink adhesion, it is first necessary to white the tinplate before printing. White is the primary color of all the pictures, with high brightness. After adding other high-energy hue, it can improve the brightness of each color and form color level.

White ink requirements are very critical.As an important indicator of the quality of tinplate printing products, the white ink is required to have a good bonding force with the primer, and the color will not go out after many high temperature baking and high temperature steaming. The primer of tinplate can increase the adhesion with tinplate and has a good binding force for white ink.

Color ink requirements are also important.Tinplate printing color ink, in addition to a certain degree of water resistance, but also need to have its special requirements. High requirements on the coloring power and durability of pigments. In addition to the basic properties of the general offset printing ink, according to the characteristics of the iron printing ink should also have heat resistance, ink film adhesion, impact resistance, good hardness, cooking resistance and light resistance.

In the production of tinplate printing, ink drying is a complex physicochemical reaction process. It is necessary to reasonably control the drying speed of ink and master the physical and chemical mechanism of ink drying in order to effectively carry out rapid printing operations and ensure product quality.

Tinplate printing relies on special structure of printing equipment.Due to the difference in substrate, the auxiliary mechanism of the tinplate press is also different from that of the printed paper offset press.The printing process equipment is generally equipped with a drying room. The entire tinplate printing automatic line is generally more than 50 meters in length, with the characteristics of precision and huge.In addition, the tinplate printing machine is controlled by magnet distribution and double sheet, and the high hardness of tinplate material also determines that advanced continuous iron transmission structure cannot be used in the printing process, and the structure of the push section, level and pile part is different from that of the printing paper offset press.