Characteristics and printing technology of the hot

The characteristics of pearlescent special ink and printing technology

the continuous and stable growth of China's national economy provides a broader market space for the printing and packaging products industry. Among them, as a special effect print of special ink printing, pearl printing will bring endless fun and new profit growth points to many of our packaging and decoration printing manufacturers

characteristics of pearlescent printing:

pearlescent printing can rebuild a new color space and light color effect on the surface of plain and plain paper, film and other substrates through the organic combination of people's personalized design and print texture. Printing base materials print and decorate all kinds of pictures and texts with pearlescent ink, which not only beautifies and protects products, but also beautifies human living environment and living space with its unique brand-new humanistic concept, and expresses people's common pursuit, so that people can enjoy richer and dreamlike brilliant colors

pearlescent flexographic printing ink is a kind of liquid ink with low viscosity and high concentration, which is similar to Newtonian fluid. It can be divided into solvent type, water-based type and light curing type. In order to maximize and fully display its pearlescent effect, the transparency of binders and colorants used to prepare ink is the first. In the production process, we must make the ink finally in the best suspension miscible state

it is necessary to ensure that the ink layer of the printed product can receive sufficient light without losing a large amount of light scattering, so as to show the special optical interference function of pearlescent light, increase the depth and layering of color, and change the crystal clear, colorful, pearl luster and elegant visual effect

usage of pearlescent ink:

due to the large proportion of pearlescent ink and water, the pearlescent ink in the packaging barrel should be carefully and thoroughly stirred before being put into the machine. In the printing process, the printing adaptability of pearlescent flexographic ink is quite excellent, with good stability and easy operation. Like gold ink, if conditions permit, we should use the circulating ink supply device of closed doctor blade as far as possible to avoid the color difference and color deviation before and after printing caused by precipitation. At this stage, the company is strengthening the research on the utilization of high-performance graphene, which will affect the consistency of products

choose a suitable flexo to avoid poor ink transfer or plate stacking. We should carefully adjust and protect the viscosity and drying speed of pearlescent ink according to the printing substrate and printing speed. Generally, the ink viscosity is 50~60sec/4cup/25 ℃. For printing coated paper and film, the appropriate viscosity is 20~30sec (4cup/25 ℃); For printing Kraft linerboard, gray paperboard, etc., the appropriate viscosity is 30~60sec (4cup/25 ℃), (the printing speed is 120m/min, and the lower the speed is, the higher the ink viscosity should be.)

pearlescent ink has its own characteristics of printability and transmissibility. The material of the roller has a decisive influence on the transmissibility of flexo ink. Because of its special ink hole shape and excellent performance of absorbing and releasing ink, ceramic roller has the best effect for pearlescent flexographic printing. Pearlescent flexographic printing requires the fineness of pearlescent ink to match the number of roller lines

the particle size of pearlescent ink is larger than that of traditional ink. Therefore, in order to ensure the printing quality, it is necessary to adjust some printing conditions, such as reducing the number of wrinkle roll lines to match the transfer of larger particle ink, which also thickens the ink layer. Therefore, it is necessary to adjust the drying temperature and pay attention to the smoothness of the paper. Pearlescent effect depends on the amount of ink transferred to the substrate. The thicker the ink layer, the more obvious the pearlescent luster. For this reason, it is recommended to use a depth of up to 50 μ M the wrinkle roller of the inking hole. According to the standard sample of printing, the best printing effect can be obtained by adjusting the printing speed. When printing, it is best to keep the ink leveling briefly after being transferred to the substrate, so as to keep the pigment crystals in the best horizontal arrangement with the surface of the substrate

choose pearlescent ink according to the design and decoration characteristics of the print: full page printing, it is recommended that you use 10~60 μ M or coarser pearlescent ink, because of its good transparency, makes the prints have a crystal clear, shiny texture; For local printing, even after repeated heating and cooling, choose fine 5~25 μ m. The pearlescent ink with strong covering makes the printing luster soft, delicate and elegant, silky and smooth

pearlescent brightness and viscosity

the brightness of pearlescent ink is directly proportional to its viscosity, otherwise, it is difficult to meet the brightness requirements of prints. If the backward capacity of 170000 tons of electrolytic aluminum is shut down, and the brightness is not enough, adjust the angle of the doctor blade, increase the thickness of the ink layer, and improve the brightness. Ink layer thickness and drying speed: with the thickening of the ink layer, the drying temperature and air volume must be increased at the same time, so that the ink film can be completely dried and the gloss effect can be improved. Smoothness of printing substrate and pearlescent effect: after printing, whether the arrangement of coloring pigments in the ink layer of the print is parallel to the substrate determines the pearlescent effect. The main factors affecting the pearlescent effect of printed matter are: the performance of ink, the transfer mode of ink, printing process and the type of substrate. Whether the printing materials are flat and smooth or not has a vital impact on the arrangement of pigments. The better the flatness of the substrate is, the more conducive it is to the formation of the pearlescent mirror. In this way, the incident light can be refracted multiple times on these layers with different optical refractive indexes, thus showing an excellent pearlescent natural color effect. On the contrary, if the colored particles are scattered and disordered, resulting in the diffuse reflection of incident light, it is conceivable that the pearlescent effect will be greatly weakened, and it is difficult to play the beautifying and glittering effect of pearlescent

of course, for large particle size light inks, the flickering gloss effect does not only depend on the smoothness of the substrate. Cover light - icing on the cake cover a layer of varnish, not only can perfectly protect the ink layer, but also can make the finishing point, icing on the cake. According to the machine speed, it is very important to adjust the viscosity, viscosity, fluidity, pH stability, drying speed and leveling of varnish, and correctly and economically handle the post press polishing process

after calendering or embossing, the pearl luster effect will be significantly improved. Gift packaging that can produce special visual attraction effect after printing on dark paper and embossing. Unbleached kraft paper can produce metallic luster after pearlescent printing and embossing. Such follow-up processes can add bright colors to pearlescent prints. In this way, without increasing the investment in equipment, your prints can be perfect and beautiful. If you attract people's attention, you can win customers and take the lead; It will enable businesses to take the lead in the fierce market competition. So as to add new special functions to our printing, packaging and decoration products and win a broader market share