The main components of the ink are as follows:
Pigment is the solid component in ink, which is the color-developing substance of ink, and is generally water-insoluble pigment. The saturation, tinting strength, transparency and other properties of the ink color 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 roller, printing plate, and rolled to the substrate to form an ink film, which is fixed, dried and adhered to the substrate. The gloss, dryness, and mechanical strength of the ink film are related to the performance of the binder.
The auxiliary agent added in the ink is 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 classification methods. If classified according to the printing method, there are the following five types:
Letterpress printing ink: black ink for books and periodicals, black ink for rotation, color letterpress ink, etc.;
Lithographic printing inks: offset printing bright resin inks, offset printing rotary inks, etc.;
Gravure printing ink: photogravure ink, engraving gravure ink, etc.;
Serigraphy printing ink: transcription printing ink, silk screen printing ink, etc.;
Special printing inks: foaming inks, magnetic inks, fluorescent inks, conductive inks, etc.
The ink configuration process is more complicated. Generally, pigments, binders and various additives are mixed in a certain proportion into an oily paste, and then repeatedly milled in a roller mill or in a roller mill to make the pigments It is made of fine particles evenly dispersed in the binder.