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After the tinplate printing is completed, a layer of varnish is required to increase the gloss and scratch resistance of the tinplate surface, and at the same time increase a certain hardness, so that the printed surface coating film has a certain flexibility and corrosion resistance

The inspection of finished printed tinplate products is divided into two types: conventional physical and chemical inspection and special requirements inspection.

Coating before printing. Under normal circumstances, the front and back sides of the tinplate need to be coated with the Coating on the outer surface and the Coating on the inner surface to ensure that the printed tinplate products have good canning, canning and appearance decoration requirements. Of course, the coating film thickness of this coating is usually only A few microns thick, it is difficult to completely cover the surface of the tinplate. Therefore, in order to prevent corrosion at the defects of the organic coating film, the tinplate is required to have corrosion resistance, and the oxide film on its surface provides coating film compactness and surface oil layer protection coating film leveling.

Tinplate printing belongs to the category of metal printing,is one kind of special printing. Tinplate printing has its special features in printing technology.

Tinplate has a wide range of applications, from packaging materials for food and beverages to grease cans, chemical cans and other miscellaneous cans. The advantages and characteristics of tinplate provide good protection of the contents in physical and chemical properties.

The social economy continues to develop, and the national living standards continue to improve. Tinplate printing products with their novel binding design and exceptionally refined printing results, and a wide range of software for different types of food, beverage cans, daily cosmetics, pharmaceuticals, kerosene chemicals Products and various packaging containers. Therefore, the quality of tinplate printing is very tight. This article will lead you to explore the printing fastness of tinplate.