Removing Metallic Coatings from Plastics and Metals by Mechanical Processing

Working from the problems associated with the recycling of surface-coated materials, tests were conducted as part of a research project to determine which mechanical processes are best suited to removing metallic coatings from both plastics and metals without the need for pre-treatment of the materials. Separation of the surface coating was possible based on compressive-shear stress as well as impact stress in combination with bending and torsion of the material. The success of coating removal, however, depends to a large extent on the adhesive strength of the surface coating.

1. Description of the Problem
During the manufacture of technical products and at the end of their useful lifetime, waste is produced that often consists of or contains material composites. In accordance with Fig. 1, composites of materials of a specific type, composites consisting of structural elements and composite materials are classified in various groups (a to d). The subject of this research was the surface coatings.
The recycling of surface-coated materials is crucially influenced by the type, form and intrinsic value of the coating or the substrate material as well as the volume of the...

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