GRC 211 Lecture Notes - Lecture 7: Flexography, Pigment, Inkjet Printing
28 May 2017
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Optical: if you print on different substrates, you want all prints to look the same (i. e. printing coke logo on cans, bottles, boxes requires different inks and processes) Color strengths: concentration of pigments in ink. Bleach test: adding white to ink to test color strength. Working: how well ink transfers on press and onto substrates. Scratches on grind gauge = clumpy pigments. Solvent based ink: dries w evaporation + absorption. Uv ink: only dries with uv radiation. Uncoated + solvent based ink dries fast. Coated + oil based ink dries fast. Drying rate: also depends on area of coverage, humidity in pressroom, and ink film thickness. Offset inks: litho ink (oil and water do not mix) Uv/radiation cured inks: does not have voc; does not pollute the air.
