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An inorganic pigment is a natural or synthetic metal oxide, sulfide or other salt used as a colouring agent for paints, plastics, and inks. Critical in the extrusion of coloured polymers is the extrusion pressure (must be low) and the moisture content of the pigment powder has to be as low as possible. The extrusion pressure is related to the fineness of the dry powder; the finer it is, the better!
The pigment pastes are very viscous and sticky. Present production lines for ultra-fine inorganic pigments usually consist of a centrifuge, fluidized paddle dryer and mill. Hosokawa Micron's solution combines a centrifuge and a DMR flash mill dryer, with a multi-blade rotor and high speed classifier.
The DMR flash dryer is a reliable machine for drying sticky inorganic pigment pastes. It is a very stable process resulting in a very fine and dry product in a one step process. The controlled high outlet temperature at 175°C ensures a high colour strength.
