Our recommendation is a unique combination of X-ray transmission (XRT) and near-infrared spectroscopy (NIR). After initial size screening and metals recovery, the material is then passed under a TITECH autosort which uses a NIR detector to remove different polymers. The remaining organic waste fraction is then passed under a TITECH x-tract unit which uses a XRT detector to remove glass, stones etc. based on their atomic density.
The high resolution of the near-infrared (NIR) system identifies and separates the polymer types PVC, PP, PET and PE. An electromagnetic sensor also removes all ferrous and nonferrous metals. In a second stage, the TITECH x-tract uses X-ray technology to determine atomic density, on which basis all of the glass, stones, etc. are removed. The contamination level of the material is irrelevant.