Gravure printing ink is a substance used to form graphic information in the printing process. Therefore, the ink plays a role in printing, which directly determines the tone, color, and definition of the image on the printed matter. In printing we need to understand the composition of the ink and the classification of the ink.

The ink should have a bright color, good printability, and a suitable drying speed. In addition, it should also have certain application indexes for solvent resistance, acid, alkali, water, light and heat. As printing, paper, and other requirements become higher and higher, the technical requirements for ink requirements have also increased. Such as modern high-speed multi-color printing presses and various color rotary printing presses, the ink is required to dry in a few seconds or even faster. Glass enamel and gold, silver enamel, and coated paper require bright ink. Printed plastic film, which requires good bonding with the plastic film; or ink that adheres to the plastic film to the maximum extent. Printing special prints, requiring the use of photosensitive inks and so on.

The main components of the ink:

The pigment is a solid component in the ink and is a coloring matter of the ink, and is generally a water-insoluble pigment. Ink color saturation, coloring

Printing ink force, transparency and other properties have a close relationship with the performance of the pigment.

The binder is the liquid component of the ink, and the pigment is the carrier. In the printing process, the binder carries the particles of the pigment, and forms an ink film from the ink of the printing machine through the ink roller, the printing plate, and the crucible to the substrate, which is fixed, dried and adhered to the substrate. The properties of the ink film such as gloss, dryness, and mechanical strength are related to the properties of the binder.

The additives added to the ink are used to improve the printability of the ink, such as viscosity, adhesion, and dryness.

With the development of printing technology, the variety of inks continues to increase, and there are many methods for classification. If you sort by printing, there are five types:

Letterpress printing ink: book black ink, rotating black ink, color letterpress ink, etc.;

Lithographic printing ink: offset printing bright resin ink, offset rotary ink, etc.;

Gravure printing ink: gravure ink, engraved gravure ink, etc.;

Stencil printing ink: stencil printing ink, silk screen printing ink, etc.;

Special printing inks: foaming inks, magnetic inks, fluorescent inks, conductive inks, etc.

The ink disposition process is more complicated. Generally, the pigment, the binder and various additives are mixed into an oily paste in a certain proportion according to a certain ratio, and then repeatedly honed in a roller mill or the like to make the pigment The fine particles are uniformly dispersed in the binder.