Introduction to various printing methods

Lithographic printing inks: Lithographic printing inks include various offset inks, lithographic printing inks, and lithographic photosensitive iron printing inks. Silica Edition inks, offset thermosetting inks, etc.

One of the characteristics of offset printing inks is that the coloring power of the inks is higher, because the offset printing is indirect printing, and the ink printing marks printed on the printings are very thin. Only strong tinting strength can meet the requirements. The modern printing speed is faster and faster. The ink should have good flow properties and good drying properties. According to the characteristics of offset printing, the ink should have good water resistance, so the ink in the ink The water resistance is very demanding. Most of the lake pigments are soluble in water, but they are buoyant. The binders, such as hydrophilic emulsification, cause poor ink transfer and dryness. The resin-based binder is more resistant than the oil-based binder. Water is stronger.

Gravure printing ink:

Intaglio printing inks include various gravure inks, engraved gravure inks, gravure plastic film inks, and the like.

Photogravure inks are typical volatile drying inks. Viscosity is the lowest among various inks. It has good fluidity and low surface tension. It is easy to fully fill in the recessed holes of the printing plate, and the ink has strong adhesion. After the paper is imprinted, the ink is transferred from the recessed hole to the surface of the printed matter as much as possible, and the ink can be dried extremely quickly and thoroughly on the printed matter.

The characteristics of the engraving gravure ink are thick and not sticky, not only loose and short, but also have appropriate thixotropy. The ink must not only easily fill in the intaglio ink hole, but also can easily wipe the ink on the blank part of the plane when rubbing the printing plate. The ink of the printing part should also be easily transferred to the printed matter. After the ink is printed on the printed matter, the line points of the graphic should not spread out, but should be dried quickly.

Ink gravure ink pigment expression is mainly ink, can not use transparent paint, engraving gravure is more used in printing securities, so the various performance requirements of pigments are higher, such as light resistance, water resistance, heat resistance, oil resistance Etc., in order to prevent counterfeiting, also often add some special additives in the ink.

Stencil printing ink:

Stencil printing inks include screen printing inks, screen plastic inks, oil type inks, and the like.

Because silkscreen printing is done with a squeegee and ink, the print is thicker, so the rheological properties of the screen printing ink should be thick, loose and non-tacky, and the pigment content in the ink can be reduced accordingly to facilitate ink energy. Smoothly through the wire mesh.

Drying method in screen ink is based on dry oxidized conjunctiva type and volatile drying type. Dry oxidized conjunctiva type ink is printed on the printed matter, and it is required to dry as fast as possible. The evaporation drying type ink adopts heating process. Helps solvent evaporation.

Printing inks are generally less fluid and less viscous, relying mainly on osmotic drying.