Common Offset Printing Ink Failure Analysis - Emulsification

Nine, emulsification

In lithography, the ink and the fountain solution are subjected to a high-speed extrusion contact, and the ink and the fountain solution are emulsified to form a water-in-oil emulsion. The fluidity and viscosity of the ink are changed, printability is deteriorated, drying is slowed, and printing failure occurs. In addition, when the oil-based emulsion in water is formed by emulsification, the ink particles are dispersed in the fountain solution to cause turbidity.

Reasons: (1) There are polar substances and surfactants in the ink. (2) Low viscosity varnish is used. (3) Wet liquid volume is large. (4) The graphic area is small and the consumption of ink is small. The ink on the printing press is in contact with water for a long time to produce emulsification.


Treatment method: In the lithographic printing, the ink and fountain solution should form a moderate oil-in-water emulsion in order to make the printing run smoothly. If emulsification becomes a print failure, take various countermeasures to solve the problem.

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