Cleaning in blasting chambers
Application: cleaning of plastic parts, deburring of duroplast thermoset parts, surface finishing of powder-based, additive manufactured plastic parts
Initial situation
Thermoset plastic parts (e.g., Duroplast) may have residual burrs because of their manufacturing process, or a subsequent surface coating (paint) may be desired. Surfaces of the parts are treated with plastic granules in blasting chambers. High electrostatic charges are generated on the components and the blasting material, which lead to the adhesion of material residues or deposits of granulate on the part surfaces or in the blasting chamber. Residue-free surfaces are required for the downstream manufacturing process so that the parts can be processed without any issues in further production steps. Blow-off without ionization is not successful, because the particles cannot release from the surface.
Solution
The plastic granulate has to be electrostatically discharged so that it does not adhere to the component surfaces or the inside of the blasting chamber. SAM55 multijet nozzles with high voltage supply are installed to eliminate the electrostatic charges. The SAM55 electrodes generate positive and negative ions to reduce the charges; the added compressed air nozzle enables a targeted blow-off of the component surfaces.
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