New metal ink
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The new metallic ink uses a large metal foil particle to reflect light to make the metallic ink glossy. For many years, metallic inks have been screen printed to produce metallic gold or silver luster. Screen printing has increased costs due to the slow speed of screen printing and printing, and the use of metal inks during printing is highly prone to defects such as poor ink drying, ink build-up and dullness. The new metal inks are usually UV-UV inks and water-based inks. When printing on sheetfed offset presses or flexographic presses, these metal inks can not only avoid the drawbacks, but also can be used as needed. Kind of color.
The metal ink is made of metal foil particles to reflect light, and the metal ink has a luster. When the metal foil particles are large, the reflected light is large, and the metal effect of the ink can be better enhanced. Too fine metal particles, one is easy to cause the light to diffuse, so that the ink loses the metallic luster; the second is easy to oxidize, not to mention the metallic luster.
In screen printing, the metal foil particles in the metallic ink are not excessively large due to limitations of the screen printing and screen printing processes. It is well known that in screen printing, the mesh size of the screen determines the accuracy of the print and also determines the size of the mesh. The higher the number of meshes, the smaller the mesh size. High-precision prints require high-net screens. If the mesh is too low, the mesh is too large, and the margin of the printed product will appear jagged, affecting the accuracy of the graphic. However, if the size of the mesh is too small, it will intercept the passage of larger particles in the ink, which will cause a decrease in the printing color density. Moreover, even if this is not the case, due to too many particles in the screen, the ink particles on the squeegee will be too much to be cleaned, which will cause the work to stop, which is not worth the effort. Practice has shown that the size of the mesh should be about 3 times the average size of the metal microchips, which is more suitable. At this time, the metal foil particles in the metallic ink can smoothly pass through the screen under the action of the squeegee. Generally, the average size of the metal ink particles is 5 to 12 μm. According to the principle that the size of the mesh should be about 3 times the average size of the metal microchip, the mesh of the mesh used is at most 275 L/cm (the mesh size is 33 μm). Obviously, printing with 275L/cm mesh is not enough.
The new metal inks can be used for sheetfed offset presses or flexographic presses without the limitations of screen meshes, so larger foil particles can be used to enhance the use of large foil particles to reflect light. The metallic effect of the ink, but due to the influence of the metal microchip on the viscosity of the ink, the metal foil particles in the metallic ink are not excessively large. Metallic inks are different from the organic pigment inks we usually know. Metallic inks do not make the inks thicker due to an increase in the fineness of the ink. This is mainly because when the metal sheet is rotated or swayed during the flow, the energy required is higher than that of the ordinary particles. The larger microchip needs a large thrust when moving in the ink medium, so the viscosity of the ink is required. Increasing, if the ink is too thick, uneven printing density and sheeting will occur. On the contrary, when a small microchip requires only a small thrust, the flow can be smooth and natural, and the viscosity is low. Larger metal microchips can better enhance the metallic effect of the ink, but in order to achieve low viscosity and print uniformity, smaller microchips are often needed. Generally speaking, the size and shape of the metal sheets in the ink are different. In order to obtain a good printing effect, the metal foil particles in the new metal ink are mostly long strips, and the microchips of this shape are satisfied. Under the premise of size, the thrust required for the movement of the microchip in the ink medium can be reduced, thereby achieving the purpose of reducing the viscosity of the ink.
Another feature of the new metal ink is the ability to effectively avoid the chemical reaction of water-based inks with the same water-based ink carrier (ink fountain or other). This corrosive chemical reaction often affects the storage and gloss properties of the ink, so new The metal ink not only has more metallic luster than the traditional metal ink, but also can be reasonably matched with various inks according to the needs, and produces various metallic inks such as red, green and blue, but it is necessary to pay attention to the arrangement of the color sequence when using, for example. Improper arrangement can not only achieve the desired results, but also lead to printing failures.
Metal inks have many differences compared to conventional inks. Most common inks are first mixed with dye and then ground by ball or roller mill equipment. However, it can be different for metal inks. Its mixing process is very gentle and cannot be ground. The grinding will cause the ink to lose its metallic luster. Furthermore, the composition of the metallic ink is quite different from that of the ordinary pigment ink. The metallic ink is composed of a sheet-like micro-metal body, and the volume is larger than that of the ordinary organic pigment ink. When printing, the ink should be applied as a sheet to achieve the reflection effect of the metal microchip. In contrast, organic inks require the organic ink particles to be fully impregnated and mixed to achieve enhanced adhesion and produce a bright finish. Another issue to be aware of is the uniformity of the distribution of the metal sheets in the ink medium. If the metal sheet is evenly distributed in the ink medium, the printing will achieve the best metal effect. The uniform distribution of the metal sheet depends on the characteristics of the resin and solvent in the ink. Good resin can make the metal sheet distribute very evenly. If you look under the microscope, you can see this distribution, and its printing effect is very good. However, the ink made of poor resin has a very uneven distribution of the metal microchips. It can be seen under the microscope that the metal sheets are stick together, and it is difficult to distinguish the individual microchips, so that the printed products are printed. Its metallic luster effect is greatly reduced.
Of course, the specific problem needs to be analyzed in detail. Different inks will have different performance capabilities on different prints. When using the best long strip-shaped water-based metal ink, it is also necessary to choose different prints. Formula.