1. Before printing the spte tinplate, the coating process must be done on the surface of the tinplate. The corresponding coating process will be different for different products. The most important coating is primer and coating. Two kinds of white magnetic. Most of the products produced require inner coating and outer primer coating. The biggest function of the coating is to effectively increase the adhesion between the tinplate and the ink layer. Putting a layer of primer on the tinplate first, and then printing the ink, can enhance the scratch resistance and firmness of the ink, so the coating plays a decisive role in the subsequent production of tinplate prints.
2. After printing the ink, we still need to put the tin sheets on the coating machine to apply varnish or matte varnish. Of course, we can also apply some special paints like pearl oil, rubber oil or explosive oil. The biggest advantage of varnish or matte varnish is to protect the ink film on the spte tinplate and increase the glossiness of the tin sheets printing pattern.
3. After the varnish or matt varnish is applied, it needs to be baked at a high temperature, so that the scratch resistance of the spte tinplate surface ink can effectively meet all aspects of tin sheets box production, such as stamping, welding, sealing, The button bone will not change color and paint during forming.