What is ink emulsification in printing, the ink will be emulsified, what is the matter?
Ink balance in the printing speed and the printing pressure, adjust the supply of wetting liquid, the volume ratio of emulsion after the ink containing wetting liquid in 15% ~ 26%, the formation of W/O emulsion oil in water ink slightly, with the amount of ink liquid supply and a printing plate at least on the match - ink balance.
What is emulsifying: the process in which a liquid is dispersed in a liquid insoluble in its form as a tiny liquid bead, known as emulsion".Characteristics of ink emulsification:The emulsification of ink is unavoidable. In the water and ink in offset printing, wetting liquid and immiscible exist at the same time. In printing, the ink and the wetting liquid are always in contact with each other. There are four kinds of press or extrusion for printing ink and wetting liquid:Ink emulsification is indispensable: in offset printing, the viscosity of the ink after emulsification drops slightly, the fluidity is improved, and it is advantageous to the ink transfer. Offset printing has water, remove some of the volatile in the air, part of the paper into the outside, the other water should have a place.If there is no emulsification, excess water will form water droplets attached to the printing ink surface, causing local ink stick, the graphic pen shortage, or white spots appear; some water droplets and reverse roller, water accumulating, generating hydrophilic layer on the roller surface, caused by roller stripping. If there is no emulsification, tiny drops of ink will exist in the water roll, gather more ink drops against the roller, the water pollution and decrease the performance of wetting liquid. If there is no emulsification, the inking performance becomes worse and the printing quality is affected.
Ink emulsification, generally speaking, mainly for lithography offset printing ink to illustrate, its unique printing method requires ink has both hydrophilic and hydrophobic characteristics.
