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With the continuous progress of printing process and technology, the printing process of tinplate box packaging has been constantly improved. Tinplate has gradually become an irreplaceable commodity packaging and printing material, and its production process and technology have been rapidly developed. Because of the material physical properties of tinplate. The manufacturing technology of the processing box and other packaging materials has great difference. The printing process mainly includes: color separation, proofing, drawing determination, plate printing, tinplate type determination, coating, printing and processing forming and other links. But in the actual tinplate printing production, should pay attention to control the following several points, the following by the beauty of packaging to everyone a brief analysis. 1. Printing inks are required to have good adhesion and mechanical properties; Generally speaking, tinplate cans/boxes are printed first before forming, and the forming process needs to go through bending, stretching, welding, flanging, winding and sealing and other procedures. So in addition to requiring coating film and ink layer to have sufficient strength, but also requires sufficient adhesion, so as not to produce in the process of processing and molding coating film and ink layer deformation cracking or even fall off. Since the adhesion between ink and tinplate is not ideal, a coat of paint (i.e. primer) is needed to improve the adhesion between the two. Requirements for printing Inks Before printing, first of all, white ink should be applied to tinplate. White is the primary color of all pictures and has a high brightness. After adding other high-energy colors, the brightness of each color can be improved to form the color value. General monochrome base color often need to be 2 ~ 3 times of printing, in order to achieve the white ink and primer has a good binding force, after many high temperature baking no yellowing, high temperature steaming do not change color, to ensure the printing effect. 3. Requirements for printing Varnish When finishing all the printed sheet metal prints, a layer of light oil should be covered to increase the gloss and scratch resistance of the printed surface, and also to increase a certain degree of hardness, so that the printed surface coating film has a certain degree of flexibility and corrosion resistance. Varnish should have the following properties: a. Good color retention, varnish solvent can not make ink color, fade. B. Have sufficient hardness and firmness to withstand the post-process deformation. C. Match the white paint or primer, and do not erode the white paint or primer; C. Safe and non-toxic.
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