How does the crystal colorful pearl powder effect appear?

Nowadays, the processing technology of printed materials is colorful and colorful, and the crystal colorful pearlescent powder effect is one of the most popular surface finishing processes. This kind of effect process is widely used in packaging, calendars, greeting cards, business cards and book covers. It is usually embellished on clothes, flowers, leaves, comic lines and other patterns, which makes people feel a sense of life and feel refreshed. How is the colorful process made? 1. Preparation for printing pictures Because not all pictures are suitable for decoration with crystal colorful powder effect. In general, in clothes, flowers, leaves, comics and other pictures, the color is slightly deeper (at least the printing ink volume is more than 200%), and the shape is not very regular. The reason is simple, it is easy to confirm in life. For example, if you put a piece of crystal glass on white paper, the crystal glass will not look so transparent, but if the crystal glass is covered with a piece of black paper or a dark object, it will look very crystal clear. 2. Selection of printing method Crystal colorful in the case of thicker ink film layer, at least 0.1mm or more, the best effect, so generally choose screen printing to achieve the maximum ink layer thickness. 3. Selection of wire mesh First, the tension of the screen should be between 20 and 21N. The mesh with a mesh number of 40 to 150 mesh should be selected. The main consideration is whether the color powder particles can pass through the screen and the number of meshes can be determined. The coarse seven-color powder selects 40-80 mesh screen, and the fine seven-color powder selects 80-150 mesh screen. The key is to understand the relationship between the screen aperture width and the volume of the colorful powder particles in the ink. If the size of the colorful powder particles is specified (as indicated in the general specification), the selected mesh size and the wire diameter of the wire mesh can be determined according to the formula O=L/M-T. Wherein, O is the pore width, L is the unit length of the metering mesh number, M is the mesh number, and T is the wire diameter of the wire mesh. It is generally required that the mesh width O of the screen should be at least 3 to 4 times larger than the diameter of the pigment particles in the ink. In addition, the fiber material of the wire mesh, the textile form and the thickness of the screen film can not be ignored. UV crystal colorful ink has large viscosity and large particle size, so it is best to choose a high-elastic, good-permeability monofilament plain woven nylon mesh. 4. Ink formulation Since the surface tension of different inks and different substrates varies greatly, the surface tension of the ink and the substrate must match each other. In order to ensure the smooth transfer of the ink, that is, the ink has good wettability on the surface of the substrate and can be smoothly spread, different substrates should be selected according to the corresponding type of ink. UV crystal colorful ink is also the same, printing must also have a targeted ink selection. If it is printed on gold and silver cardboard, it must be selected with UV crystal ink for gold and silver cardboard. If it is printed on polyester film, UV crystal ink for polyester film should be used. Generally speaking, after adding the colorful powder to the UV crystal ink, the viscosity of the ink tends to increase, which is very unfavorable for printing. At this time, an appropriate amount of diluent can be appropriately added to reduce the viscosity of the ink. Of course, the inks of different manufacturers are generally equipped with corresponding thinners, and the special thinner specified by the manufacturer must be used when adding. 5. Scraper and mesh distance requirements Select a scraper with a Shore hardness of about 80° to ensure the corner stiffness and the slope is 45°. The printing pressure should not be too large, the standard is just to scrape the ink on the screen. The blade pressure is too large, and the screen itself is easily deformed and loses its original elasticity, which causes the ink printed on the substrate to stick back to the screen. The thickness of the printed ink and the smooth surface effect are inferior. Because the ink is thick, the particles are coarse, and the printing ink layer is thick, the mesh distance is adjusted to the ink just printed on the substrate, and the gap is too small. After the printing, the screen printing plate cannot be separated from the substrate, and the screen printing plate is lifted. At the beginning, a certain ink adheres to the bottom of the plate, which is likely to cause a paste. After the above steps, it is necessary to test before mass printing, to see if it meets our requirements and effects, and if not, adjust according to the corresponding requirements.