Characteristics of aluminum foil gravure printing

Analysis of the characteristics of aluminum foil gravure printing ink

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core tip: aluminum foil belongs to metal, which can not absorb ink and water as much as paper, so we can only rely on the printing pressure to make the appearance of printing plate and aluminum foil print A4 format experimental reports; Large area of contact, forcing the ink to adhere, and then through the drying system of the printing equipment, the moisture transpiration, oxidation and conjunctiva drying. This requires strong ink adhesion, boring and fast speed. Because it needs to be dried at high temperature, it requires not only that the ink binder and pigment have a high heat-resistant function, but also that the ink does not fall off and change color during printing and heat sealing

[China Packaging News] in the printing process of aluminum foil, there is a high demand for the ink used. Whether solvent based ink or water-based ink, the viscosity of ink is one of the main goals

analysis of the printability of special ink for gravure printing of aluminum foil

aluminum foil belongs to metal, which cannot absorb ink and water as much as paper. Only by virtue of printing pressure, the surface of printing plate and aluminum foil can contact with each other in the largest area, forcing the ink to adhere, and then through the drying system of printing equipment, the water transpiration, oxidation and conjunctiva are dry. This requires strong ink adhesion, boring and fast speed. Because it needs to be dried at high temperature, it requires not only that the ink binder and pigment have a high heat-resistant function, but also that the ink does not fall off and change color during printing and heat sealing

gravure ink is a liquid ink, and viscosity is one of the main objectives to measure rheology. Viscosity is usually expressed by measuring the outflow time of ink with a viscosity cup. Ink viscosity is closely related to handling rate, adhesion and color balance. Under normal viscosity, the ink handling in the hole is excellent, and the printing points are not exposed and trailing. When the viscosity is low, the resin and pigment components in the ink are relatively small, and the gloss of the print is poor; If the viscosity is too low, it will lead to quality problems such as large areas of color blocks of printing products are not solid, graphics and texts are weak, flat water ripples, ink spreading, flying ink, etc; When the viscosity is too large, the ink is in a supersaturated state, the pigments are unevenly dispersed, agglomerated and accumulated, and the fluidity becomes poor, resulting in problems such as scratches, white spots, small dots, blocking, and shallow color change of the printed products

functional analysis of solvent based inks

most solvent based inks are commonly used chloric acid resin and acrylic resin. This kind of resin can provide excellent adhesion of aluminum foil and good heat-resistant function, and has bright color, high concentration, strong adhesion and good transparency. In the printing process, the solvent volatilizes a lot, which is not environmental friendly. It also simply forms the accumulation and drying of ink in the intaglio hole, resulting in the paste. Therefore, it is necessary to pretreat the accumulation and freezing of ink through ink mixing or adding a warm water bath. The ink viscosity is usually controlled at the scale of 17~26s (25 ℃, 4 # viscosity cup)

functional analysis of water-based ink

ring wear made of water as solvent: it is a basic type of type preserving liquid ink with parts failure, which has the characteristics of non combustible, non explosive, non-toxic, non irritating smell, stable inkiness, bright color, non-corrosive printing plate, good post press adhesion, etc. Water based ink pigments are required to have strong alkali resistance, good dispersion, high saturation, excellent humidity, and no discoloration and fading. According to the printability comparison, the functional objectives of water-based inks have basically reached the level of solvent based inks, and even exceeded the level of solvent based inks in some objectives. However, there are also shortcomings of poor drying function, high drying energy consumption and low drying power of inks. Customers can easily enter the misunderstanding of brand effect in purchasing according to their requirements and select suitable inks