Method and a device for identifying material types of spatial objects

A method for identifying material types of spatial objects, in particular plastic objects, the method comprising

• obtaining an acoustic signal from each identified object by deforming the objects mechanically,
• recording said acoustic signal and comparing it to an acoustic model being obtained on the basis of analysis of reference objects of multiple material types, wherein the method is enabling to thoroughly differentiate between various types of plastics preferably using statistical classification of acoustic signals, wherein the objects are set in motion,
• wherein the deforming step is carried out in such a manner that the objects are crushed, and
• wherein the deforming step is carried out in such a manner that the objects are set in motion with a velocity of at least 5 mm/s in relation to a solid barrier (PR), which is located in the trajectory of the moving objects.