What is the influence of the gloss of the printed ink film?

What is the influence of the gloss of the printed ink film?

The gloss of the ink ink film, in addition to the nature of the binder and its refining process, is also closely related to the nature of the pigment in the constituent structure and the size and shape of the particles as well as the surface and optical properties of the paper. Generally speaking, the ink film on the printed sheet is dull, mainly due to the capillary structure and smoothness of the surface of the paper, as well as the microscopic unevenness and thickness of the ink film, the higher the smoothness of the paper, and the distribution of the printed ink layer. It tends to be uniform and smooth. When the light is incident, the surface of the ink film is almost specularly reflected, so that it can display a bright and bright color. On the contrary, the smoothness of the paper is low, the distribution of the ink film is uneven and rough, and when the light is incident, the surface of the ink film causes diffuse reflection. Can not show the shine that should be.

How to choose the viscosity of the ink during the printing process?

The viscosity of the ink refers to the degree of viscosity of the ink as it flows, and it is an indicator of the resistance of the ink fluid flow. In the lithographic process, a certain viscosity is the main condition for ensuring the normal transfer of ink, and is also an important condition that determines the fastness, clarity and gloss of the ink. When the viscosity of the ink is too large, the transfer and transfer of the ink is difficult, and the amount of ink on the printing plate is insufficient, resulting in a flower plate; when the viscosity is too small, it is easy to produce floating dirt, and in severe cases, the ink may be excessively emulsified or prevented from being normally transferred and transferred, and Gradually build up on the ink roller, plate and blanket. When it accumulates to a certain extent, it will cause a paste.

In the printing process, the selection and control of the viscosity of the ink should be determined according to the absorbency of the paper used and the printing speed. When printing paper with good absorbability, an ink with a higher viscosity can be used. Conversely, inks with a lower viscosity can be used. When the printing speed is slow, the viscosity of the selected ink is larger; when the printing speed is fast, the viscosity of the selected ink is smaller. In addition, the viscosity of the ink also changes due to the influence of ambient temperature and working surface temperature. When the viscosity of the ink changes, it also causes changes in ink fluidity, consistency and viscoelasticity.