Influencing factors of ink adhesion of uv printer

The adhesion of uv printer ink refers to the binding force between the ink layer and the printing material after printing and curing. Adhesion is the basis for measuring the printing effect of uv printers. If the adhesion is not good, no matter how high the printing speed is, no matter how good the color reproduction is, it will be futile.

There are many factors that affect the adhesion of UV printer inks, mainly the surface state of the printing material, the surface tension of the material, the viscosity and formula of the UV ink. ①The cleanliness of the surface of the printing material. If the surface has oil stains, paraffin wax, silicone oil, etc., it will hinder the direct contact of the UV ink with the surface of the material, and the adhesion will be severely reduced. Therefore, the surface of the material must be cleaned before the uv printer works. For porous or material surfaces, conventional inks can basically meet the adhesion requirements.

②Surface tension of uv ink. Only when the surface tension of the uv ink is less than the surface tension of the material can it achieve good wetting. Poor wetting is likely to cause surface defects and affect ink adhesion. When the surface tension of the material is fixed, the surface tension of the ink can be reduced by adding a surfactant.

③Viscosity of uv ink. If the ink viscosity is too large, it is easy to produce streaks or orange peel-like ink layer on the surface of the material. The important factor affecting viscosity is temperature. When the temperature is high, the viscosity of the ink decreases, and vice versa. Therefore, the production environment where the uv printer is used should be as constant as possible.