The types of drier are fatty acid, naphthalene acid, cobalt, manganese, aluminum salt and so on. Offset, can not be separated from the offset printing ink, but also less ink cleaning agent. This shows that manufacturers of printing ink cleaner to face, and these will give a detailed description of the printing machine engineering manual. In addition, some ink also contains calcium carbonate and other fillers. Black pigment currently used in printing ink for inorganic material, and color ink for organic pigment. The fountain solution is composed of water, inorganic compounds and Arabia gum hydrophilic, very good. 

Commonly used in offset printing ink connection material with vegetable oil and solvent oil type. These salts can be oxidized by oxygen in the air, the metal ion valence increased after oxidation to strengthen, promote drying oil oxidation polymerization, so this kind of additives on the oxidation drying polymerization and cross-linking of membrane reaction is catalytic role. Ink cleaning agent is mainly divided into two categories: one is gasoline, kerosene, and the other is a special cleaning agent for printing (professional commonly known as the 'ink cleaning agent'). 

According to its molecular structure, the offset ink can be dissolved by organic solvent, and the pigment in the ink is not soluble in water or organic solvent, but has a certain affinity to water. 

According to the ink drying mechanism, the ink is divided into four types, which are oxidative polymerization, dry type, dry type, volatile dry type and light curing type. 

Regardless of is what kind of printing ink on their common requirements: in the printing process transfer to paper surface before, must maintain the stable living idea; and in the transfer to the paper surface, must as soon as possible to lose activity and curing and drying; ink of printer materials have good adhesion; ink should have a good transmission; printing ink on paper consisting of graphic must keep accurate luster lasting. According to statistics, the total output value of the whole world in offset printing, ranked first, the name 'Queen' simulation printing. 

Composition of offset ink 

General printing machine manufacturers will be strictly testing the use of chemicals on their machines, the ink cleaning agents also have strict delineation. 

Offset printing is one of the best methods of multi color, high speed and quality. 

The use of offset printing ink additives mainly to adjust the ink viscosity of the flax oil, increase the brightness of the ink gloss agent, to promote the drying of ink drying agent, etc.. Such as carbon black, titanium, chrome green, the characteristics of inorganic pigment is chemical function not disorderly, heat-resistant and light resistant and strong. The disadvantage is that the coloring is low; and organic pigment is synthetic organic compounds, with bright color varieties, printing adaptability strengths. The disadvantage is that the high light and heat resistance is poor. Oxidative polymerization drying ink is the use of mineral oil, dry vegetable oil and synthetic resin, such as the connection of the material, usually used to make offset printing ink. Printing ink is a kind of complex structure, which is formed by the average particle size of solid particles, which is about 0.1 microns in size, and so on. 

The printing ink is composed of binder, fillers, pigments and additives of several components. Thus it can be seen, in the component of the ink cleaner requires both containing organic solvent, and the need to contain and inorganic compounds and dye affinity good components to according to the 'structure similar to the compatibility' chemical principle, in the process of cleaning ink using the emulsifying principle, formation 'oil in water emulsion, oil in water emulsion, in order to achieve the cleaning roller, blanket and a printing plate ink to. According to the requirement of printing, the printing process is mixed and stirred according to a certain proportion. For example: Heidelberg printing machine on the use of strict testing, the use of ink on the printing machine can be used in Heidelberg, there are three types of ink cleaning agents: Bottcherin 60, Superdot and Varn. When this type of ink transferred to the printing surface, because of paper capillary attraction, the ink low viscosity mineral oils to penetrate the paper inside, and make the viscosity of the ink slowly increased, this process in high viscosity dry vegetable oil and synthetic resin composition of colloid and air contact surface area gradually increased, stem of vegetable oil in the unsaturated fatty acid double bond cross-linking and oxidation polymerization and the formation of network structure, ink viscosity increased rapidly and finally fixed on the surface of the paper and dried. Vegetable oils such as linseed oil, tung oil, dehydrated castor oil containing unsaturated double bond structure of dry vegetable oil, solvent oil, such as oil, kerosene and other dry mineral oil, benzene, xylene, methanol, ethanol, isopropanol volatile organic solvents. Pigment comprises two types of inorganic and organic pigments, inorganic pigment composition may is inorganic elemental and metal oxide or salt. In addition, also useful rosin, asphalt and other natural resins and phenolic resin, polyamide resin and other synthetic resin to do the connection.