What are the classifications and main components of printing ink?
The requirements of different printing materials for printing ink:1) news paper: for newspaper printing ink letterpress printing ink is a kind of very thin, low viscosity, good liquidity, liquidity it depends on the speed of printing. It is completely dry absorption drying. News printing by letterpress printing to offset the substitution, flexographic printing the news has also been used in printing, flexo printing has been in extensive use of water-based ink.2), paper coated paper and surface treatment: embossed and sheet fed offset printing ink, for thickness should be non coated paper thickness, ink viscosity should be larger, the ink drying finally depends mainly on the oxidation of trabeculectomies in coated paper; rotary machine for printing of coated paper in progress, require the use of quick drying ink, while the oxidation of trabeculectomies drying inks have gradually been thermosetting ink replacement.3), non coated paper, uncoated paper quality are different, the ink must also adapt to various kinds of paper. Usually use printing ink sticky, but the ratio of coated paper for ink drying is dilute, by osmosis absorption and oxidation of trabeculectomies to achieve.4) board: cardboard cartons, cardboard boxes, usually used to make printed packaging, hardcover book cover. In printing, printing ink liquidity is very good, viscosity is small, can impact resistance, in the process of handling the ink Sassafras wait for mechanical force. In the cardboard printing can use all manner of printing: oxidation conjunctival dry letterpress or offset printing, infiltration and evaporation drying of gravure or flexo printing.5) some other papers:
The chief component of printing ink:The printing ink is composed of pigment, binder and filler dispersed and mixed slurry. Color printing with pigment colloid rich and colorful; the connection material as pigment as the pigment carrier, adhesive fixed on the substrate surface; give appropriate ink filler properties, so that ink to meet a variety of printing process printability.The ink should have a certain degree of mobility, and meet the requirements of various properties of the printing process, can quickly dry in the printing ink film, after drying should have corresponding water, acid and alkali resistance, light fastness, rubbing, wear resistance.
Classify by printing process:1), offset printing ink, offset printing ink (referred to as India ink) is a thick and sticky ink, mostly for the oxidation of trabeculectomies drying inks, it must have good water resistance can be divided into sheet fed printing ink and paper ink, mostly for the former type of quick oxidation drying ink the latter, mainly in penetration drying.2), letterpress printing ink (referred to as convex printing ink): thick ink viscosity, it has varied widely, and the printing machine speed. Including penetration drying, drying, drying and other volatile oxidation of trabeculectomies drying it in several ways, or a combination of several drying methods. A rotary letterpress printing ink printing ink, ink, ink and other news.3), flexo printing ink is a kind of very dilute ink from the rheological point of view, it is one of the most close to the Newton fluid. Ink ink drying mainly by solvent evaporation to complete, in the paper on the drying part due to penetration of ink on the paper. The realization of the ink can be divided into alcohol type, mixed type and type three.4), intaglio printing ink (the gravure ink): can be divided into two categories, one is gravure ink, the other is intaglio ink. The former is a very dilute fluid, the viscosity is very low, completely by solvent evaporation drying, is a kind of volatile drying inks, can be printed in a non absorbent substrate; the latter is high viscosity, yield value is relatively large, not greasy, basically rely on the oxidation of trabeculectomies drying.5), printing ink: good flowability, low viscosity, low viscosity, fast transfer, through the mesh to the absorbent substrate surface after drying, can rapidly penetrate in the non absorbent substrate surface should have good adhesion. The drying methods are the following: dry type, oxidative polymerization and infiltration dry type, two-component reaction type, UV drying and so on.
1) the oxidation of trabeculectomies drying inks, 2) penetration drying ink, volatile drying inks, 3) 4) 5) radiation drying inks, wet solidification drying inks, 6) condensation drying ink, 7) precipitation drying ink, 8) two-component reaction drying inks, 9) gel dry ink, 10) filter drying ink, 11 types of ink drying) combined with a variety of methods.
A lot of ink types, physical properties vary, some are very thick, some very sticky, some are quite thin. Its composition can be divided into three parts: the liquid component known as bonding material; solid components called colorant (pigment or dye) and various additives. Different ink drying in different ways: the use of different printing inks are different; different substrate using the ink is also different.
