Optimization of Separation Parameters for a Pneumatic Separation Device for Plastic Evidence at Explosion Sites

Extracting and recovering plastic evidence at explosion sites is important for police investigations. Pneumatic separation is an efficient recovery method that is simple and environmentally friendly. To improve the accuracy of material separation, it is necessary to fully understand the influence of internal flow fields and structural design when using a material evidence classification device at explosion sites. In this study, a combination of a simulation and experiments is used. The results from the simulation are used to design a pneumatic separation device that is applied to explosive separation experiments. The grade and recovery rate of the plastic materials are excellent, which confirms the suitability of the device to classify plastic evidence at explosion sites.