The gloss of an ink layer refers to the ability of a printing ink layer to reflect light from a certain angle under a fixed light source. The gloss of the ink layer has a great influence on the appearance of the printed matter. The gloss is good and the color is bright, which can significantly improve the grade of the printed material. The gloss of the ink layer is mainly affected by the leveling property of the ink and the smoothness of the surface of the film material. The better the leveling property of the ink transferred to the film, the smoother the film surface, the better the gloss of the ink layer. In addition, the gloss of the ink layer is also affected by the following factors with the film material unchanged.
1. Ink solubility and viscosity
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. The working ink viscosity is suitable. It is beneficial to the leveling of the ink and the gloss of the ink film is better. Ink degradation. Solvent imbalance, over-dilution and solvent impact not only affect the printing performance, but also destroy the ink structure, resulting in the separation of the pigment and the resin oil, and often significantly reduce the gloss of the ink layer.
2. Binder
The binder not only plays a role in dispersing pigments, but also plays a role of protecting the pigments and showing luster. Adding a proper amount of varnish within the range allowed by the color density can increase the gloss of the ink layer to some extent.
3. Drying speed of ink
In general, reducing the drying speed of the ink properly helps improve the gloss of the ink layer. The ink drying is too fast, and the ink after overprinting is easy to whiten. It appears that the matte ink dries too slowly, and adhesion and other troubles may occur, causing the ink layer to lose luster.
Squeegee
The squeegee angle is too large or the squeegee blade is too sharp (for example, a new blade), and the printed ink layer lacks gloss. On the contrary, it is beneficial to increase the gloss of the ink layer.
5. Printing environment
In the printing process, the solvent volatilizes fast and the ink film dries quickly. Due to the effect of evaporation and heat dissipation, the heat around the ink film is absorbed and the water vapor in the air rapidly condenses, forming a fog on the surface of the printing ink film and causing the ink layer to lose. Gloss, this effect is more pronounced in high humidity environments.
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