According to the type of printing ink is divided into one-component and two-component ink, according to the composition is divided into different connecting materials, pigments, diluents and additives, according to the type is divided into physical drying type, chemical curing type, drying type and UV type.

1. Physical drying type (single component)

The series of inks are dried by physical volatilization of the solvent. At the same time, the surface of thermoplastic materials (such as polystyrene-PS, polyester carbonate-PC) is eroded by solvents. Through this erosion reaction on the surface of the substrate, direct cross-dissolution occurs between the ink and the substrate. In this case, high abrasion resistance and good adhesion of the print are ensured. One-component ink dries quickly.

2. Chemical curing type (two-component)

This series of inks show strong chemical resistance, good adhesion and abrasion resistance, especially for substrates that are difficult to print. The hardener must be added to the ink, which will chemically react with the binder. When adding hardener, you must pay attention to its ratio. Too little hardener: the pot life is long but the adhesion is poor; too much hardener: the pot life is short and the ink is fragile; on the other hand, the hardener should be added to the ink shortly before printing, because the mixed hardener The pot life of the ink is very limited. Depending on the type of ink, the pot life is typically 6-12 hours. The full cure and optimal adhesion of the two-component ink takes several days to reach. A common mistake is to test its adhesion and chemical resistance too early. The user must follow the instructions in the relevant technical data.

3. Baking type ink

The characteristics of this ink are similar to those of the two-component ink. The chemical reaction is the crosslinking of the binder under high temperature conditions.

4. UV type

UV ink is cured by ultraviolet radiation ink, because the UV ink does not contain solvent, that is, the ink will not change the substrate surface viscosity, so the ink transfer is relatively difficult.

The ability of these inks to quickly become sticky will determine whether the ink can be effectively transferred to the substrate surface. At the same time, in order to adjust the printability and performance of the ink, in addition to adding solvents and catalysts, there may be many additives, such as viscosity ink adjustment agents, antistatic agents, rheological agents, etc. However, the use of additives will have a great impact on the printing performance of the ink, the use must be cautious.