Special requirements for printing inks by Mazhong Iron

(1) has good adhesion and mechanical properties

As tinplate prints are eventually made into cans and cans of food cans, toys, metal photo frames, and chemical products, they need to be cut, bent, and stretched. Therefore, tinplate inks are required to have good adhesion to tinplate and corresponding mechanical properties. performance. In order to improve the adhesion of the printing ink, the tinplate must be first made white before printing. White is the basic color of all pictures and has a high degree of brightness. After adding other high-energy hue, the color contrast can be increased to form a color gradation.

(2) Requirements for white ink

Tinplate is silvery (or yellow) on the surface and has a metallic luster. Before the printing of color graphics, the surface needs to be printed white. Due to the limitation of ink coverage, it often requires 2-3 times of whitening, and its whiteness can reach 75%. . Whiteness is an important indicator of the quality of Indian iron products. Yintie white ink has a good binding force with the primer, after many high-temperature baking is not yellowing, high temperature steaming does not take the color. Priming the tinplate, you can increase the adhesion with the tinplate, a good combination of white ink force. Commonly used primers are epoxy amine type, with light color, no yellowing after many times of baking, no aging, and good flexibility and impact resistance.

(3) Requirements for color ink

In addition to having a certain degree of water resistance, tinplate printed color inks also require special requirements. Since tinplate surface does not penetrate moisture and solvents, it needs to be baked and dried, so its ink should be heat-cured. The coloring power and durability of the pigment are more demanding. In addition to the basic properties of ordinary offset printing inks, iron printing inks should also be characterized by 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) Drying process of ink

In the printing iron production, the drying of the ink is a complicated physical and chemical reaction process. There are many factors that affect the drying. Therefore, to control the drying speed of the ink and ensure product quality, it is necessary to grasp the physics and chemistry mechanism of the ink drying, that is, the factors that affect the drying speed, so as to effectively perform rapid iron printing operations. The drying speed of ink has become the main content of ink drying. So, what is the danger of ink drying too fast? Can reduce the ink's normal transmission performance, affect the normal production; can cause the imprint to be weak, the ink is pale, the printing plate, the ink roller surface appears ink dry knot, so that the ink in the transmission is blocked; can make the printing plate picture dry knot layer External expansion; can make the amount of desiccant excessive ink absorption caused by increased, blank part caused by dirt. So what is the danger of ink drying too slowly? Can cause overprinting difficulties, resulting in adhesion; can cause poor adhesion, reduced firmness; easily cause scratches in the transmission process. Therefore, the drying speed of the ink should be suitable, too fast and too slow are unfavorable.