The tinplate box printing technology has been very mature, and the current domestic tinplate box printing technology is very advanced. The printing process includes: four-color printing, spot-color printing, printing is the process of making the text, pictures, photos, anti-counterfeiting and other originals of the design manuscript through plate making, inking, pressure and other processes, so that the ink is transferred to tinplate, cardboard, plastics, leather And so on the surface of the material. Printing is the process of transferring the approved printing plate to the substrate (tinplate box) through the printing machine and special ink.
Commonly used printing processes in the market
1. The use of printing inks. For printed products, you must pay more attention to the use of printing inks, and strictly abide by the specifications for the use of printing inks, especially the adaptability of substrates and various printing inks. Due to the use of multiple printing methods, the performance of inks used in various printing methods must be controlled during the production process.
2. The control problem of printing overprinting. The production and production of printed products should also pay attention to the problem of overprinting between printing methods, and do a good job in the calculation and measurement of overprinting. That is to say, according to the type of substrate used (tinplate, cardboard, plastic), the drying method of the ink used in various factors, the printing environment, the accuracy of machine registration, the speed of normal production, the materials of various plates selected and other factors Develop a preliminary scaling amount, and then determine the final parameters after proofing.
3. Coordination of production process. Printing is sometimes applied to different printing production processes, which requires coordination and cooperation of different printing production processes. Appropriate process changes and process combinations are suitable and beneficial, but too many and too complex will easily affect the stability of product quality during mass production.
The difference between paper printing and tinplate box printing process:
1.The tinplate box substrate is different, it is a tinplate instead of paper. The basic characteristics of the tinplate box are important considerations for the metal lithography operation process. The materials that need to be used for the lithographic printing of the tinplate box should be different after the tin box is formed. It is required to choose different material varieties, such as the amount of tin plating on the surface of the tinplate box and its quenching and tempering degree. The surface performance of the tinplate box also directly affects the appearance of the printed matter and the use value of the product. If the tin layer on the surface of the tin box is unevenly distributed, it will cause the tinplate box to have different shades of color after plate printing and uneven corrosion resistance, which will affect the final use value of the product.
2.When the tinplate is made into a tin box, it needs to go through processes such as stretching, buckle bone, and stamping. These processes are not required for carton forming. Therefore, this requires that the ink adhesion on the surface of the tinplate box needs to reach a certain physical and chemical index. Therefore, before the lithographic printing of the tinplate box, the corresponding coating process must be done on the surface of the tinplate box. A basic function of coating is to enhance the adhesion and adhesion between the ink layer and the tin box. Depending on the product, the coating process is also different.
3. After the tinplate box is printed, we need to apply varnish or dumb oil on the coating machine. The main function is to protect the printed patterns, increase the brightness of the graphics on the tinplate box pattern, and make the tinplate box not change color and paint during molding.
4. Tinplate box printing uses special ink with special performance. From the requirements of the ink drying method in the printing process, the biggest difference between the surface of the tinplate box and the surface of the carton is: the surface of the tinplate box is smooth and has no absorption capacity, while the carton has Porosity, ink can penetrate. Therefore, the drying of tinplate box printing ink mainly includes two methods: oxidized conjunctival drying and volatile drying. At the same time, because tinplate boxes are usually printed into metal packaging containers for packaging products, especially food tin boxes (such as food cans, beverages, etc.). Therefore, according to the different products inside, the tinplate box printing ink is generally required to be resistant to high temperature, retort, non-lacquer, non-fading, non-toxic, abrasion-resistant, water-resistant, and grease-resistant.
5. Paint plays a decisive role in the quality of tinplate box prints. Tinplate box prints generally need to undergo various subsequent processing before they can be made into various tinplate box packaging containers. Among them, tinplate box printing is full of beautification and decoration for metal packaging containers. Play a key role. To make the graphics printed on the tinplate box bright and eye-catching after being made into a packaging container, it is inseparable from the special effect of the paint. The function of the coating is manifested in two aspects: one is to increase the adhesion between the tinplate box and the ink layer; the other is to protect the ink layer, and at the same time increase the brightness of the pattern, and it is not in the process of making cans. Discoloration, no paint drop, and the surface of the carton has strong adhesion, and it can achieve a good printing effect without adding paint during the printing process.
6. The printing operation of tinplate boxes is different from the offset printing operation of general paper boxes. The printing machine should be carefully considered when manufacturing the feeding table. For tinplate boxes of different thickness, different quality, and different materials, the best blowing force and blowing nozzle should be considered. The suction power of the suction nozzle, and adjust the air volume of the blowing nozzle and the suction nozzle at any time during the printing process to achieve the best feeding state. At the same time, a horseshoe-shaped magnet is added to the feed to overcome the adsorption force between the tinplate boxes, and in conjunction with the blowing force of the blowing nozzle, the tinplate boxes can be conveyed smoothly and uninterruptedly. When adjusting the pressure of the roller, in addition to considering the thickness of the tin box, the transfer of the dots must also be considered (the pressure is too small, the dots of the printed matter are imaginary, the pressure is too large, the dots are severely deformed and the graphics are distorted). Always put the finished product in the center. Tinplate box printing products are generally intermediate products. The ultimate goal of tinplate box printing is to obtain a finished packaging container that meets the requirements. The printing effect is finally displayed on the finished product. Therefore, all links in the printing process are The finished product should be the center.
