China Gold Packaging Network's professional technology to explain the use of water, ink repulsion of the physical nature of tinplate, with the help of printing pressure, the blanket transferred to the plate on the tinplate, is the principle of flat offset printing. Because the tinplate has a special materialization The nature and the reworkability of the printed matter are different from the ordinary offset printing process.

Tinplate printing ink special requirements:
(1) It is required that the ink has good adhesion and mechanical properties. As the tinplate prints are ultimately to be made into cans and cans of food cans, toys, metal photo frames, and chemical products, they need to be cut, bent and stretched. The printing ink has better supporting and corresponding mechanical properties for tinplate. In order to improve the adhesion of the ink, a large layer of base oil must be applied to the tin before printing.
(2) Requirements for white ink The surface of tinplate is silver (or yellow) and has a metallic luster. Before printing color images, it is necessary to coat the surface with white or white ink, which is limited by the ability of ink coverage. Monochromatic machines often require 2 Times white, its whiteness up to 75%. Whiteness, as an important indicator of the quality of tinplate printing products, requires white ink to have a good bond with the primer. After many high-temperature baking, it does not yellow, and high-temperature steaming does not take away. Priming tinplate can increase the adhesion with tinplate and have good adhesion to white ink. Commonly used primer is epoxy amine-based, with light color, no yellowing after many baking, no aging characteristics and good flexibility, impact resistance of the process performance.
(3) Requirements for color inks In addition to having a certain degree of water resistance, the color inks printed by tinplate also require special requirements. Because the surface of tinplate does not seep through moisture and solvent, it needs to be dried by baking. Therefore, the ink should be heat-cured. The coloring power and durability of the pigment are required to be high. In addition to the basic properties of offset printing inks, iron printing inks should also have heat resistance, strong ink film adhesion, impact resistance, good rigidity, resistance to cooking and light resistance, etc., according to the characteristics of the printed iron.
(4) Ink drying process In tinplate printing production, ink drying is a complex physical and chemical 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 perform fast printing operations and ensure product quality. Too fast ink drying will reduce the normal ink transfer performance and affect the normal production process; The ink is light, the printing plate, the ink roller surface appears on the ink roller, so that the ink in the transmission is blocked; the printing plate graphic is dry outwardly; the amount of the desiccant is too large, the ink absorption force is increased, the blank part is dirty, etc. Symptoms. Ink drying is too slow and can cause difficulties in overprinting, adhesion, adhesion, etc., the degree of firmness is reduced, and can easily cause scratches in the transport process. Therefore, the ink drying speed should be appropriate, too fast and too slow are unfavorable.
(5) Special structure of printing equipment Due to different substrates, the auxiliary mechanism of tinplate printing presses is also different from other offset printing machines. Tinplate is insoluble in water and does not absorb solvents, so printing inks need to be baked at high temperature in order to cure the solvent volatile conjunctiva. Therefore, the printing process equipment generally needs to be equipped with a drying room. The entire length of the entire tinplate printing automatic line is generally about 50 meters or so, which has the characteristics of large precision. In addition, the tinplate printing machine is controlled by using magnet sorting and double sheets, and the tinplate material is high. Hardness also determines that advanced continuous iron feeding structures cannot be used in harsh printing processes, and that the structure of the conveying, calibration, and receiving parts is different from other offset printing machines.
China Gold Packaging Network often has the following problems in tinplate printing:
1. Accuracy of overprinting of printed products is of great concern with product quality. With the application of multi-color printing machines, higher requirements are imposed on the accuracy of overprinting, even if partial overprinting is not allowed, the quality of the prints will be affected. Influencing the overprint error of the printed version, the deformation of the printing plate, the irrationality of the drum liner, the poor quality of the blanket, the poor elasticity, and the easy deformation; improper adjustment of the iron printing machine, poor precision of the machine parts, etc. Cause overprinting is not allowed.
According to the requirements of India Railway, the first printing plate must have a positioning crosshair, and the crosshairs of the printing plate are coincident with this crosshair. The following principles should be mastered when adjusting:
(1) The positioning force is able to reach the energy, easy to adjust (2) the position of the printing plate adjustment direction and how much it should be consistent (3) The method should be taken more loose and less pull to prevent the printing plate from being detached due to excessive force adjustment. The disadvantages of the folder or deformation (4) The adjustment of the printing plate should be advanced to some extent, so that a margin can be given to the printing plate and the roller. (5) The adjustment of the side rule must be grasped by 1:1. It is based on the thickness of the tinplate. Adjust the size of the spring force properly. It is advisable that the distance between the side gauge and the tinplate is generally 3-5 mm, but there is also a need to change the direction of the material.
2. The sticking phenomenon of tinplate and rubber roller occurs when printing a full-size (field) product. Solution:
(1) Reducing the viscosity of the ink and increasing some of the ink varnish properly (2) Check if the tinplate and printing pressure are reasonable (3) Adjust the proper speed of the printing machine (4) Control the ink volume 3. Imprint tone is not correct Shallow phenomenon solutions;
(1) Check blankets, cushions are reasonable or there are changes and displacement phenomenon (2) control layout water consumption (3) appropriate adjustment of the amount of ink transmission (4) check the printing plate ink absorption and ink Layer formation 4. Ink balance solution:
(1) Because the adjustment and use of the water roller is unreasonable. The actual ink consumption of the printing plate graphic area is underestimated, resulting in the phenomenon that ink is larger than water or water is larger than ink in the printing, and ink-ink imbalance occurs. Deeper but the printing plate has no significant water phenomenon, you can judge the ink is large. Generally take the ink fountain off to stop the ink supply, after the ink can continue to be normal.
(2) Deeper imprinting and printing plate consumption is normal. If the ink fountain is stopped, the ink supply will be stopped and the outline will be unclear. The layout water consumption should be increased. (3) Imprinting of printed iron in Chinese prints is full and deep, and printing plates are used. There was no abnormality. I mistakenly thought that the water was less than the ink and blindly increased the printing plate water consumption, resulting in water and large ink phenomenon. Imprinted pinholes, a large number of ink on the roller pile up, so that the ink roller is too thick ink , And the plate is dirty. At this time should take the dual steps of ink withdrawal. And the remaining ink on the ink roller shovel out in time, until it returns to normal or wash machine for ink.
5. Plate dirty solution:
(1) Appropriately increase the concentration of the drug solution to increase the acidity of the acid solution (2) Incorporate a certain amount of gum or alcohol (3) Clean the layout, remove the smudges 6. Imprinting is poorly drying or sticking back.
(1) Appropriately increase the temperature of the drying room (2) Slow down the original operation speed of the iron printing machine (3) Add a certain amount of desiccant 7. Solutions to the problem of scratches in the production of printed iron products (1) Check the transmission mechanism of the iron printing machine Various factors that are likely to cause scratches in various parts (2) Check the operation of the iron suction nozzle and the iron feeding mouth (3) The direction of teeth can be used as the direction of the teeth at the cutting edge of the tinplate (4) The stacking of tinplate prints must be neatly arranged

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