The POLRO® rotary kiln has a statically determined support configuration on only two roller stations and has a direct drive system. The kiln shell with its splined tyres rotates on self-aligning rollers, which automatically adjust themselves to the momentary running conditions. The kiln is directly driven via the rollers of the inlet-end roller station. This system supersedes the previously conventional girth gear and pinion mechanism. The POLRO® is rounded off by pneumatic inlet and outlet seals, hydraulic axial thrust system and air-cooled inlet trough.

Thanks to the statically determined support configuration, this kiln design is characterised by high operating reliability, minimal maintenance and inspection requirements and therefore very low operating costs.