One of the important components for formulating of inks is fillers or additional pigments. Basically it is important that ink is not too concentrated with pigments because too much pigment will give negative impact on printability of ink.
Market for fillers to grow
Fillers do not affect the tone of ink, but they have changed rheological properties of printing inks.
Among other things, enhance the colors consistency, so they become more suitable for printing.
Fillers are actually fine-grained white or transparent inorganic powders. As pigments, and they are insoluble in the binder. Fillers added to the binder give transparent dispersion.
Filler task is to replace a certain percentage of expensive pigments and to have positive influence on the properties of printability of inks. In use today there are cheap, mineral fillers, and artificial fillers that are somewhat more expensive.
Artificial fillers are fine-grain white powders, and usually they are received with deposition of hardly soluble salts. These fillers have lower hardness and higher dispersion from natural and so their use is greater.
Because they can change the rheological properties of printing inks, fillers must not chemically react with the binder, or dissolved in it.
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Aqueous dispersions of fillers are opaque, and oil filler dispersion was partially transparent.
Fillers can differ in chemical composition and fineness of grind. Central particle size is between 0.01 and 1 micron.
Specific gravity of fillers ranges between 1.5 and 4.5 g/cm3. Depending on the color, fillers must be white or transparent and should not affect the tone of the pigment. Fillers must be resistant to binder in long term strategy, and must not chemically react.
Filler China Klej is widespread in nature aluminum silicate. It is obtained by digging, washing, precipitation, drying and calcination. This filler is white fine-grain powder, with soft structures. It is used for deep and screen printing.
Filler Aluminum hydroxide is one of the most important filler in the industry of graphic colors. It is obtained by deposition of aluminum sulfate. It is characterized with the low specific gravity, high dispersion and is very transparent.
It is resistant to light, alkali and water, but not resistant to high temperatures.
It is used to create multicolored and transparent inks.
The most famous fillers used in the manufacture of printing inks are:
- Barium Sulfate
- Aluminum hydroxide
- Magnesium carbonate
- Calcium Carbonate
- Talk
- clay
- Silica
