Summary

Pigments are insoluble substance in water or alcohol. They are used as ingredients in paint, ink, cosmetics, etc. as coloring substances. Pigments are classified into 2 types: organic and inorganic pigments. Inorganic pigments can be divided into 2 types: natural mineral pigment and synthetic inorganic pigments. Dyestuffs are dissolved in a solvent and used for coloring fiber, paper and others.

The dry grinding and classifying of pigments and dyestuffs must pay attention to the extremely critical product properties. These products have a high tendency to form deposits, which increases the risk of system blockages. Because of this, it is impossible to give a generally valid rule regarding machine selection with fineness or throughput values. Each machine and every system must fulfill a great number of requirements. We therefore modifies its systems to suit the product: special mills with wide-chamber housings; modified fluidized bed opposed jet mills; fluidization units for locations where deposits are likely to form; installation of flexible rubber linings; hot-air mode; the addition of grinding aids, etc.

Also, in the mixing process, various sizes of Vrieco Nauta Mixer (Fig.) are adopted for higher accurate performance and time- and energy-saving operation.

Contraplex mills are versatile in operation in the paint industry. Special features are the wide-chamber housing to prevent formation of deposits, as well as high grinding fineness and low energy consumption.

High-tech systems for end products with steep particle size distributions and exact top-size limitation.

Fluidized bed opposed jet mills are suitable for abrasive ceramics pigments since it is advantageous on wear protection and reduction of build-up products.

Drymeister is the most suitable for drying organic pigment such as blue, green, red, etc.