The development of a pre-treatment plant for non-hazardous, solid mixed waste into a smart waste factory for future involves the introduction of real-time characterisation of waste streams by applying sensor technology. First, research has been conducted on the application of near-infrared spectroscopy for quality assurance of solid recovered fuels (SRF) produced by the pre-treatment plant. The method is based on statistical analyses, thereby requiring a comprehensive database of detailed waste data. To ensure high-precision measurements, data must be gathered at the level of individual particles and must cover a broad spectrum of different particle types. In a previous study, the fine-shredded SRF (