Clarification of metallic pigments and production process
Clarification of metallic pigments for printing ink and application
Metallic pigments are utilized in all state-of-the-art printing processes in order to impart high quality gold or silver metallic effects. These metallic effects enhance the appearance of printed articles and give the impression of added value. In addition to their application in established solvent systems these products are also extensively used in environmentally-friendly water-based or uv curable systems.
Using the major print processes: Offset (sheetfed, heatset ), Flexo- (narrow web, wide web, tower coaters), Gravure and Screen Printing (rotary and flat bed), a wide range of materials can be printed such as paper, carton, cardboard, tissues, plastic films as well as metals, textiles, leather, etc. The most important end applications for metallic pigments include labels, packaging (tobacco products, foodstuff, non-food articles, etc.), wrapping papers,wallpapers, magazines, as well as high-quality art prints and advertising prints.
The classic metallic pigments are produced by ball milling, this process produces irregularly shaped, metallic flakes, referred to as corn-flakes. More sophisticated ball milling produces round pigment particles having smooth surfaces, that is Silver dollars. Another process uses vapour deposited aluminium foils, whereby the extremely thin, high-reflective metallized film is removed from the substrate and processed into pigment dispersions, called Vacuum Metallized Pigments or VMP.
During the ball milling process organic lubricants are added in order to avoid the agglomeration of pigment particles. Leafing or non-leafing pigments are thus produced, depending on the lubricant chosen.
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