Ink gloss refers to the size of the ability of a printed sample to reflect the amount of light in one direction when illuminated by light. The influencing factors of gloss mainly include the nature of ink, printing conditions, the nature of paper and the relationship between paper and ink.
For ink, the gloss depends on the smoothness of the ink layer, that is, leveling, the retention of the binder in the ink film helps to improve the gloss. The conditions for forming high gloss are: â‘ pigments are evenly dispersed â‘¡ has sufficient viscosity â‘¢ fast drying speed to reduce excessive penetration of the binder into the paper, adding dry oil, generally can increase the gloss and after drying, the ink film should have flatness , Make the incident light energy as much as possible to produce a mirror surface, reflect to reduce the generation of warm reflection.
For printing conditions, the gloss depends on the printing speed, printing pressure, printing temperature and humidity, and whether to spray powder after printing. When the printing speed is fast, the amount of the connecting material entering the paper is small, and the gloss is reduced. When the printing pressure is large, the gloss is high. When the printing temperature and humidity are large, the capillary holes of the paper are opened, and the binder and pigment in the ink are easy to penetrate and the gloss is high. Conversely, if the smoothness of the paper is poor, the gloss is relatively low.
Therefore, several methods to improve the gloss of the ink layer are as follows: â’ˆ Ideal pressure is the first condition to improve the gloss of the blotting ink layer. Insufficient pressure will make the blot empty, and the floating ink transferred to the surface of the substrate will be exposed, and it will also stack, Heap rubber, therefore, should prevent light pressure. "Field" printing can increase the thickness of the liner appropriately. â’‰ The water consumption of the layout should not be large, the ink transfer is difficult due to the large water, the imprint is empty, the ink color is dark and uneven (before and after the interruption), the color is not fresh (the emulsification value increases and the ink color is diluted), if the "field" area is large or there are many color blocks , Can appropriately reduce the PH value of the potion to ensure that the minimum moisture is used without dirt, and that the amount of ink under the ink fountain is not reduced. â’ŠWhen possible, use overlapping ink printing, make color separation to make use of the technical characteristics of borrowing overlapping ink, use light color ink as the base color, dark ink as the complexion, and properly control the interval time of the overlapping ink overprint to obtain a good stack Ink effect. â’‹Printing light color "ground" can be diluted with transparent diluent to improve its brightness. High-grade printed parts can also be diluted with bright paste. Unless otherwise required by the product, white ink should be used as the diluent to print as little as possible. â’ŒFlushed inks should choose inks with weak coloring power and low density to meet the needs of the color saturation of the blotting ink. Because the inks with too strong coloring power are used as the dilute double color, "solid" ink will make the layout The ink layer is too thin to cause a "pattern" and reduce gloss. â’Adapt to add dry oil, can improve the gloss of the "ground" color block. For urgent items, white dry oil and red dry oil are added, and red dry oil (usually added in red ink and black ink, medium blue and dark blue ink can also be added) can increase the "solid" gloss, if there is no overprint, you can only add Red dry oil, the gloss is stronger. Red dry oil mainly acts as a surface drier. â’ŽCoating varnish or plastic laminating film on the printing surface can enhance the gloss, but the cost is higher. The high gloss oil is characterized by good water resistance, fast drying, and the ink drying film is delicate, bright and transparent, mainly used in fine printed products And field printing.
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