After the ink is stored for a period of time, the upper part of the ink appears thin in the container, the viscosity is small, and the color and concentration are relatively poor; The lower part is thick, the viscosity is large, and the color and concentration are also relatively good. Intaglio printing inks are thin and have a small viscosity, because the pigment is poorly dispersed in the connecting material; Excessive density of pigments or fillers; It is easy to precipitate after long-term storage. Even after fully shaken, without affecting the use of the conditions, this state of the ink will give customers a bad impression, while increasing the burden of workers.

In gravure printing, ink resolubility is also a key indicator to test the performance of ink. Especially in the color ink printing, the moderate resolubility can not only make the color fully displayed, but also solve the problem of shallow plate mesh blocking and overprinting cross-color. In color ink printing, according to the different hue requirements, the depth of the ink hole mesh of the printing plate is different, the amount of ink transferred to the surface of the substrate is also different, the volume of the ink hole is large, the amount of ink filled in the printing process is large, and the film layer transferred to the substrate is thick; The inking hole volume is small, the amount of ink filled is small, and the film layer transferred to the substrate is thin. As a result, a dense and colorful picture is formed on the substrate. Inks with poor resolubility, in the shallow screen part of the plate due to the high-speed rotation of the cylinder in the ink tank, the residual ink is not easy to be re-dissolved by the ink in the ink tank, resulting in the shallow printing of the net hole, and eventually causing the blocking accident. For inks with good resolubility, the printed ink is easy to be dissolved by the ink solvent in the printing plate during the overprinting process, resulting in ink crosstalk problems. Sinograce Chemical produces primer adhesion promoter and polyurethane resin for printing ink Chemical Additives.welcome to consult.

Anti-viscosity is an important physical property index of printing ink.Gravure printing is a kind of printing method with high ink supply, good reproducibility and fast printing speed. Most of the inks used are solvent-based volatile drying inks.After the ink is transferred to the substrate through the printing plate, it passes through the drying channel, and the organic solvent is quickly volatilized and dried. As we all know, when winding through the high temperature baking channel, the surface temperature of the printing film is generally between 40 ° C and 60 ° C, and due to the existence of the winding pressure, if the anti-anti-viscosity of the ink itself is not good, it will lead to serious quality accidents of winding and adhesion, causing irreversible economic losses to ink customers. The anti-anti-viscosity of the ink is not only related to the thoroughness of the solvent gradient volatilization in the printing process, but also directly related to the film formation of the resin binder used and the molecular properties of the resin. Good film forming resin bonding material can give the ink good dry, after the solvent volatilization and thorough drying, the film formation is complete, and the anti-viscosity after winding is excellent. Sinograce Chemical produces primer adhesion promoter and polyurethane resin for printing ink on PP and PE.Chemical Additives.welcome to consult.

Organic pigment is the most basic material to provide color to the ink, but as the ink attached to the surface of the substrate, the color shown to the consumer often produces more or less deviations from the color of the pigment itself. The reason is that in the ink, the pigment particles do not exist alone, but are dispersed in the connecting material medium. Microcosmic, the best wetting dispersion state of a pigment particle is completely evenly wrapped in a resin binder and attached to the surface of the substrate.The display of color is that the light incident on the coated pigment surface through the resin bonding material film layer is transmitted to the consumer through reflection. The transparency of the resin is good and bad, and the size of the color number directly affects the expression of different colors. At the same time, whether the resin is sufficient for the wetting and dispersion of the pigment directly affects the uniform coating of the resin on the pigment, and also affects the color of the ink itself. Sinograce Chemical produces primer adhesion promoter and ink resins for PP and PE.Chemical Additives.welcome to consult.