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SANDBLASTING
Sandblasting is defined as the pre-treatment of the surface of a workpiece through exposure to sand (corundum) as an abrasive in order to remove rust, dirt, old coatings, paint or other impurities from them. The purpose of this process is to ensure optimum pre-treatment of the workpiece for the coating process. The blasting abrasive, in this case corundum, is applied under high pressure to the surface to be treated using a special tube and nozzle system. In this manner, parts of the surface are separated and finally removed through the abrasive effect of the corundum, thus producing a clean surface. HÜNI + CO has several different blasting facilities which we can use to machine up to 10 m long workpieces with corundum of various grain size for you. Blasting with corundum according to DIN EN 12944-4.
GLASS BEAD BLASTING
Glass bead blasting is a similar method to blasting with sand or corundum for pre-treatment of a workpiece surface. However, this process uses small glass pellets, which are considerably smoother and subsequently produce a smoother surface. The special feature of glass bead blasting is that it achieves plastic deformation, which produces the desired internal stress in the workpiece and subsequently increases the fatigue strength significantly. This is the reason why shot blasting is often mentioned in this context. Glass bead blasting causes the surface to be less roughened than blasting with sand or corundum. The more delicate the glass beads, the smoother the surface structure, right up to a polished effect.
DECOATING USING THE PYROLYSIS PROCESS
Pyrolysis is a pyrolytic decomposition. During a thermal process, in the absence of oxygen, chemicals are split, whilst larger molecules are converted into smaller ones. Colloquially speaking, pyrolysis also represents burning or combustion. With plastics their matrix is destroyed and they disintegrate. In coating technology pyrolysis is an upstream process, if workpieces are being renovated with an old coating, i.e. being recoated. We offer pyrolysis as a possible decoating process for the pre-treatment of your workpieces.
THERMAL DEGREASING
A grease-free surface is an essential condition for the substrate adhesion of coatings and other surface finishes. In addition to chemical degreasing, thermal degreasing is also used for this purpose. At high temperatures, substances such as oils and greases are combusted during thermal degreasing. The residues produced during this process would reduce the substrate adhesion of a coating and therefore they are removed, e.g. by blasting.
