POWDER AND PARTICLE PROCESSING – Applications – Chemicals – PTFE Processing of PTFE Polytetrafluorethylenes are thermoelastic polymers which are characterised by their high chemical resistance and low adhesive power. PTFE is used as a non-stick coating in the paper, textile, and foodstuffs industries as well as in plastics processing, in the electrical and aerospace industries, in aircraft construction, chemical apparatus engineering, in laboratory equipment, and in maintenance-free bearings and seals. The following flow chart shows a grinding system in special design. The flow behaviour of PTFE was paid particular attention to during system layout and design. The system was designed for the following problem specification: Teflon (PTFE) feed size up to 20 mm (Teflon chips). Required end-product fineness: 99.8 % < 50 µm. System performance: approx. 250 kg/h. Necessary grinding air: approx. 3200 m²/h at 7 bar (g). 1 = Pneumatic feed 2 = Fluidised bed opposed        jet mill AFG 3 = Automatic filter 4 = Rotary valve 5 = Control cabinet A = Feed product B = End product The grinding process is performed with a Hosokawa Alpine fluidised bed opposed jet mill AFG with pneumatic feed unit. A filter installed downstream of the classifier mill collects and separates the end product from the grinding/classifying air. The end product exits the filter bin through a rotary valve. The entire system is controlled by means of an electric control system.

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