Method for adjusting ink density of gravure printing machine
The gravure press ink is composed of a solid resin, a volatile solvent, a pigment, a filler, and an additive. It does not contain vegetable oil, and most of its drying methods are volatile. Gravure printing machine inks can be divided into three types: gravure printing machine inks; plastic gravure printing machine inks; alcohol-soluble gravure printing machine inks. The role of the solvent in the ink is to dissolve or disperse all solid components in the ink; to wet the surface of the substrate to be printed; to adjust the drying speed of the ink; to adjust the consistency of the ink to suit the inking requirements of the printing plate.
Concentration adjustment method of gravure printing machine inks Most of the inks sold by manufacturers have set the factory quality standards according to the specifications of precision, concentration and fineness. However, in printing, according to different requirements, it is sometimes necessary to adjust the ink appropriately. There are three ways to reduce the concentration of the ink and reduce the ink concentration:
1. Use ink to adjust the concentration
Soy sauce (also known as gold oil) is a material composed of various components other than pigment in the ink. Therefore, when the concentration is adjusted using the soy sauce, the viscosity will remain unchanged, and only the formulation of the resin and the pigment changes.
Use the adjustment ink to dilute, in addition to reducing the concentration, it can also improve gloss and transparency. However, if a large amount of soy sauce is used in a small amount of ink, it is likely to cause clogging, so care should be taken.
2. Adjust the concentration with a thinner
A thinner (also known as a thinner) is a transparent ink made by replacing the pigment portion of the ink formulation with a so-called "body pigment" - a colorless pigment. Therefore, the use of a thinner to reduce the concentration, the viscosity of the ink remains unchanged, the ratio of pigment to resin can remain substantially unchanged, and will not cause blocking, but often causes the gloss and transparency of the ink to decrease.