The type of dryer fatty acids, naphthalene acid, essien acid manganese cobalt, etc, aluminum salt and so on. Offset printing, cannot leave the offset printing ink, also without ink cleaning agents. This shows the manufacturer of a printer ink cleaner, and these will face in the engineering manuals are given on printing specific instructions. And in some ink contains calcium carbonate etc. Colloid filling At present the printing ink used in more than XuanSe pigments for inorganic, and color ink more for organic pigment. Education version by water, inorganic compound liquid and Arabic gum composition, hydrophilic is very good.
Offset printing ink common connection type and material have vegetable oil solvent oil type. These salt can be the oxygen in air oxidation, one of the metal ions increased combining power after oxidizing strengthen, can promote oxidation GanXingYou polymerization, so this kind of additives on GanXingYou oxidation polymerization of crosslinking into film reaction catalytic activity. Ink cleaning agents are divided into two kinds: one is steam, kerosene, another kind is printing special cleaner (professional is commonly known as the ink cleaning agents' ').
Offset printing ink according to the molecular structure of organic material, can be dissolved organic solvent, and the ink pigment is insoluble in water, soluble in organic solvent, not only to the water has certain affinity.
According to the main mechanism of ink dry the ink is divided into oxidation polymerization drying, permeate the drying, volatile drying and photosensitive ical cured four categories.
No matter which type of printing ink on their common requirement is: in the printing process transfer to paper surface, must be kept before don't: live idea can; And in the transfer to paper surface, as soon as possible after the necessary activity and curing dry; lost Ink printing material to have very good adhesion; Ink should have a good contagion; Printing ink on paper, the composition of the graphic must be kept lasting accurate brilliance. According to statistics, the world output, offset printing ranked first, so have the queen's ' 'simulation printing the laudatory name.
The composition of the offset printing ink
General printing machine manufacturers will use in the strict test machines, printing ink cleaner chemicals to also have the strict defined.
Offset printing color, high speed, is one of the best quality printing method.
Offset printing ink used additive main has the adjustment of the ink viscosity linseed oil, increase the ink gloss brightener, promote the ink dry dryer, etc. Such as carbon black, titanium dioxide, chromium green wait, inorganic pigment is characteristic of the chemical function not disorderly, light resistance, heat resistance, defect is strong tinting poor; And organic pigment is a synthetic organic compounds with bright-coloured color, variety, printing adaptability strengths, weaknesses light resistance, heat resistance is poor. Oxidative polymerization drying ink is to choose mineral oil, dry vegetable oil and synthetic resins refined into connection material, usually used as the offset printing ink. Printing ink is a complex colloid, the particle size is about 0.1 micron pigment solid particles scattered in average connection formed in the material.
Printing ink is connected by material, filler, colouring materials and fertilizer consisting of several components. Therefore, in ink in part of cleaner, need to have both contain organic solvents, and the need to contain and inorganic compounds and pigment affinity good ingredients, can according to 'structure similar' chemical theory, are in the process of cleaning ink using emulsion principle, form 'water bag oil, oil-in-water emulsions, in order to achieve the' emulsion cleaning ink roll, rubber cloth and on the purpose of the ink printing plate. In the configuration in the printing requirements according to certain proportion, and mixed stirring by rolling rolling ink technology is made. For example: Heidelberg printing machine is strictly defined by test, can be used in printing machines Heidelberg, the printing ink of cleaning agents have three: Bottcherin 60, Superdot and Varn. When this kind of printing ink transferred to printing surface, because in the paper after the attraction of the capillary effect, make the ink low viscosity mineral oil leak to the interior of the paper infiltration, and make the ink viscosity slowly increase in this process, high viscosity dry vegetable oil and synthetic tree fat of colloid and air contact surface area gradually increasing, dry vegetable oil of the unsaturated fatty acid in an oxidation of a double crosslinking polymerization and formed the mesh structure, make ink viscosity rise up quickly, and finally a solid surface and dry in the paper. Vegetable oil type such as linseed oil, tung, dehydration castor oil and other contains unsaturated double bond of the structure of the dry vegetable oil; Solvent oil type such as oil and mineral oil, not sex kerosene benzene, xylene, methanol, ethanol, isopropyl alcohol and volatile organic solvents. Pigment including inorganic pigments and organic pigments two kinds, the composition of inorganic pigment may be inorganic elemental, metal oxide or inorganic salt. In addition, useful also rosin, asphalt and other natural resin and phenolic resin, polyamide resin, synthetic resin do connection material.
