Solvent evaporating inks

Although solvent evaporating inks are most commonly employed among pad printers, UV (light) cured, catalyst (chemically) cured, water-soluble, sublimation (heat)... 

Web Heat-Set Publication and Commercial Inks. Almost all heat-set inks are now printed on web offset presses, and are based on vehicles containing synthetic resins and/or some natural resins. These are dissolved in hydrocarbon solvent fractions which are specially fractionated for use in the ink industry. They vary in boiling range between 180 and 300 °C. Small percentages of alkyd resins (qv) may be contained in these inks. They dry in less than one second by means of solvent evaporation in a heatset oven. These ovens utilize high velocity hot air to raise the web temperature to 120-150 °C. 

Many of the materials used for boiler water antifoams are also employed as synthetic lubricant replacements for mineral oils, brake fluids, emulsion polymerizers, emolients, solvents for inks, cleaners, and antifoams for saltwater evaporators. These materials have been... 

The printability of the LEP ink is determined by a number of factors, including the viscosity of the ink, the solvent evaporation rate, and the interactions between the ink and the screen, emulsion, and substrate. Screen-printable solutions normally require considerably... 

Traditionally, evaporation-drying solvent-based inks have been used. These have been replaced during the last decade by UV curable inks, which exhibit the following advantages ... 

CIJ inks need to work on numerous substrates and there is a relationship between drop spread on a substrate and print quality. The amount of drop spread depends upon a number of issues in a CIJ ink, including surface tension, viscosity, solvent evaporation rate, interaction with substrate, amount and type of polymer in the ink etc. You may wish to improve the print quahty of a certain ink-substrate combination by optimally adjusting the drop spread. A common method to do this is by adding a surfactant to the ink formulation. Depending upon the chemistry of the surfactant, it will either increase or decrease drop spread, and hence is a good mechanism for tuning print quality. There are many hundreds of surfactants available, and you can use all chemical types, including anionic, cationic, non-anionic forms. Specific examples include polyoxyethylene fatty ethers and diethylhexyl sodium sulphosuccinate. 

More consistent ink quality as no solvent evaporation occurs (also less ink waste). 

The interaction between the ink and the substrate, both during and after deposition, strongly influences the quality of printing. Dynamic ink-substrate interactions such as ink drop impact, wetting, spreading, penetration, and solvent evaporation rate, as well as drying and coalescence of the ink particles on the substrate, are aU important factors. 

Ultraviolet light (UV) curable screen ink solder masks and photopolymerizable dry film solder masks have been available commercially since 1973 (5). These materials offer the PCB manufacturer many processing and production advantages relative to the conventional solvent-evaporative thermally cured solder masks. These products based on a new emerging technology have helped... 

Flexographic—evaporation. Inks may be alcohol-, solvent- or water-based, depending on material being printed. (With papers absorption is also involved.) UV inks and UV drying are available. 

Screen-printable electroluminescent polymeric inks contain a variety of additives in order to control the viscosity of the electrolmninescent polymer ink, to decrease the solvent evaporation rate, and to improve the ink consistency and working time. ... 

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