In today's high-end packaging cartons, packaging and printing in order to improve results, often to improve the surface brightness of the box, one common approach is to use special paper, such as gold and silver cardboard, the kind of paper printed thereon, Cots In order to obtain higher gloss, often use the transparent ink to print, Next, I talk about the clear ink printability. Transparent Ink characteristics: ink is transparent toner using all or most of the ink dye made rubber roller, its hiding power is low, high transparency. Hue: Due to the high transparency of the transparent ink after printing Cots are generally composite aluminized, aluminum film gloss and ink gloss combined with each other, reflecting the more vibrant colors. Moreover, the use of transparent ink products, viewed from different angles, the hue will be more obvious changes were observed difference will be even greater in a different light. Therefore, in the deployment of this type of ink, be sure to understand what customers composite materials for ink formulations according to the same process, and the ink was observed under similar circumstances hue. Such as hue, some ink compound before very close to the standard sample, but the complex hues may be very different; the other hand, there are some ink after hue, although the standard sample have a certain gap, but compound its hue closer to the standard sample. Cots transparent ink hue deployment is very laborious, so clearly the customer's process is very important. Transparency: Transparency transparent ink from the dye (pigment) and binders (including additives) in two parts decisions and play a major role in the former, the latter effect is small. On polyurethane, polyamide, polypropylene chloride, these types of ink often made of resin, the more transparent urethane ink. Cots general, colorant dye ink, pigment transparency than the transparency of the ink colorants higher. Sometimes, because of other needs, but also in parts of the dye mixture of pigments, when the transparency of the ink will be reduced. Residual solvent and odor: Attentive operator will find transparent ink drying speed was slow, cot because clear ink solids content low (due to the dye concentration is higher than the color pigment, so do not amount too much), solvent content is high, so it is necessary to control their dry conditions, or is likely to cause excessive residual solvent, and odors. Serious, after co-solvent will slowly to the surrounding infiltration, diffusion, so that other colors to change color. Therefore, when using such transparent ink must pay attention to solvent ratio and printing speed control, printing and then into the barn about 40 ℃ was aged over 10 hours. Dissolution of transparent adhesive ink: transparent ink used in the dye is completely soluble in organic solvents, so when printed with the composite into contact with adhesive, adhesive solvent will be printed on a transparent ink more or less dissolved away. Improve composite speed or increase the viscosity of the adhesive can alleviate this problem to some extent, but only a palliative. Also, if transparency allows appropriately reduced, you can add some pigment in dyes to produce transparent ink, which is transparent ink dissolving problems have some improvement. In addition, for the above-mentioned problems, and some ink factory has developed a completely insoluble in alcohol soluble adhesive transparent ink, and in some printed material has been very good application, I believe that the future will develop insoluble in ester insoluble gum transparent ink viscosity agent. Peel strength: transparent ink after printing products with poor peel strength problems when the composite aluminized often. Why is this so? In fact, not only the clear ink and the problem exists, when using other printing inks, printing without white ink substrate, metallized composite (especially VMCPP) also appear after the phenomenon of poor peel strength, but usually This process is rarely used in other ink printing, so rarely found in the peel strength difference of the phenomenon. Of course, not to say that all the composite ink have this problem.