When cleaning sheet and profile rolled metal, it is often necessary to remove abrasive particles and dust from horizontal surfaces. Learn how to properly clean abrasive residue and dust from metal to ensure reliable surface preparation for painting and extend the service life of steel structures.
After shot blasting sheet and profile rolled metal, abrasive particles and dust often remain on the surface of the components. The degree of contamination depends on the initial condition of the material before blasting, as well as the equipment settings. To ensure the metal is fully prepared for subsequent painting or protective coating, additional cleaning is required.
Why Remove Abrasive Residue and Dust?
The main goal of shot blasting is to create a smooth and clean surface that ensures strong adhesion between the paint or coating and the steel. However, residual shot and fine dust particles can significantly reduce adhesion quality. If contaminants are not removed, paint may eventually peel off, corrosion can develop, and the structure may wear out prematurely. Therefore, final cleaning is a mandatory step in preparing steel for further use.
Main Methods for Removing Shot and Dust Residue After Shot Blasting
Almost all conveyor-type and roller shot blasting machines for processing sheet metal and profiles are equipped with abrasive removal systems. At the exit of the blasting chamber, a brush block is installed to mechanically remove residual shot from the surface.
In addition to the brush system, air blow-off units are often used. One or more radial fans generate a powerful air stream that removes dust and abrasive particles even from hard-to-reach areas, preventing the formation of “dead zones.” This combined approach ensures more thorough cleaning and better surface preparation.
Quality Control of Surface Cleaning
To achieve consistent cleaning quality regardless of workpiece size, modern machines are equipped with photoelectric sensors. The system automatically measures the height and shape of the part and adjusts the position of the brushes and air nozzles accordingly. This allows the equipment to process both thin sheets and large profiles with equal efficiency.
Conclusion
Removing shot and dust residue after shot blasting is a key stage in preparing steel structures for painting and coating. Using brush and air blow-off systems in combination with automatic size detection ensures high-quality cleaning, extends the service life of metal products, and improves the reliability of protective coatings.