1. Solubility and viscosity of ink
The stronger the solvent's ability to dissolve the ink, the better the ink dissolves, and the gloss of the ink layer is relatively better. Working ink viscosity is suitable. Conducive to the leveling of the ink, the gloss of the ink film is better. Ink deterioration. Solvent imbalance, excessive dilution and solvent impact will not only affect the printing performance, but also damage the ink structure, causing the pigment and resin oil to separate, often significantly reducing the gloss of the ink layer.
2. Link material
The binder not only plays the role of dispersing the pigment, but also plays a role of protecting the pigment and showing the gloss. Adding an appropriate amount of ink oil within the allowable range of color density can improve the gloss of the ink layer to a certain extent.
3. Drying speed of ink
Generally speaking, appropriately reducing the drying speed of the ink is conducive to improving the gloss of the ink layer. The ink dries too fast, the ink color after overprinting tends to whiten, and the matt ink dries too slowly, and adhesion and other failures can occur, causing the ink layer to lose its gloss.
4. Squeegee
If the angle of the doctor blade is too large or the doctor blade is too sharp (such as a new blade), the ink layer after printing will lack gloss. On the contrary, it is beneficial to improve the gloss of the ink layer.
5. Printing environment
During the printing process, the solvent volatilizes quickly and the ink film dries quickly. Due to the effect of evaporation and heat dissipation, the water vapor in the air is rapidly condensed due to the absorption of heat around the ink film, and fog is formed on the surface of the printed ink film, causing the ink layer to lose Gloss, this effect will be more obvious in high humidity environment.
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