Pigment is a solid component in ink. It is a chromogenic substance of ink and is generally insoluble in water. The saturation, tinting and transparency of the ink are closely related to the properties 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 pigment particles from the ink half of the printing press through the ink roll, plate, roll to the substrate to form an ink film, fixed, dry and adhered to the substrate. The gloss, dryness and mechanical strength of the ink film are related to the properties of the binder.
Additives are added to improve the printability of the ink, such as viscosity, adhesion, dryness and so on.
With the development of printing technology, the varieties of ink are increasing and there are many ways of classification. If printed according to the classification method, there are five kinds:
Letterpress ink: black ink, black ink, color letterpress ink, etc.
Lithographic printing ink: offset printing bright resin ink, offset printing ink, etc.
Intaglio printing ink: gravure ink, gravure ink, etc.
Porous printing ink: Stencil Ink, screen printing ink, etc.
Special printing ink: foamed ink, magnetic ink, fluorescent ink, conductive ink and so on.
Ink configuration process is more complex, generally pigment, binder and various additives, in accordance with a certain proportion, first in the ink blender into oil paste, and then in roller mill or repeatedly grinding, so that the pigment with fine particles, evenly dispersed in the binder and made.