凹印油墨常见参数（Gravure printing ink common parameters）.docVIP

凹印油墨常见参数（Gravure printing ink common parameters） Gravure printing ink common parameters The color of the paper itself, the brightness of the absorption of light is different, but also lead to changes in ink color. For a small amount of metal salts such as drying oil, there can be greatly accelerated the oxidation of metal salts are commonly used cobalt, manganese, lead salts, which is drier. If the ink is transparent, the light irradiation to the ink surface, a department is absorbed, a department is reflected, another department transmitted to the paper surface reflection, the ink layer, the color ink is directly reflected by the Department of light and color synthesis. When the ratio is 1, the pigment is transparent; when the ratio is greater than 1, the pigment is opaque, i.e., has a hiding power. Pigment is divided into two kinds of inorganic and organic pigments and inorganic pigments are hard and dense crystal materials, these crystals without special treatment is difficult to grind into fine particles, not well dispersed to the binders, so printing inks made of inorganic pigments are not ideal, and easily wear plates. Gravure printing ink can be approximately regarded as Newton fluid, its yield value and thixotropy factor can not be considered, so its rheological curve is a straight line through the origin. Among them, colored materials play a role in color, depending on the color of the substrate to form a contrast, in the substrate to show images. If the viscosity of the ink is large, the viscosity of the ink is also large. Mainly plasticizers, slow drying agent, desiccant and so on. Viscosity of ink. Sticky ink is not only difficult to transfer to the surface of the paper, but also easy to pull out the paper surface of the paper, causing quality accidents. The composition of the link material is more complex, mainly oil type bonding material and resin type bonding material, organic solvent. This is critical for high-speed gravure printing which requires hi