This firm has developed a process for ambient grinding of waste tires that is said to be more economical than traditional ambient or cold grinding processes. Tires are first cut into 50–100-mm chips, which are then conveyed to the rubber-grinding unit (photo). There, the chips are ground in a Kahl flat-die granulation press according to the pan grinder-roller principle. The chips are ground between the cylindrical pan grinder rollers and the circular die, which is designed as a perforated plate. The shearing force produced by the pan-grinder, as well as the pressing force (up to 120 bar) applied by a regulated hydraulic system, decompose the tire parts and separate the components. Because only shearing forces are involved, the wear of the grinding tool does not have any influence on the granulation results. A granulation press Type 60-1250, with a power drive of two times 160 kW processes up to 4.5 ton/h of tire chip to a granular size of 0.4–20 mm. The modular system is designed for a throughput of up to 15,000 ton/yr. Plant capacities can be increased by simply adding modules in parallel. Hall 9, Stand E08 — Amandus Kahl GmbH, Reinbek, Germany