REMOVAL OF PREVIOUS painted layer
The paints only dry by evaporation of the solvent (nitrocellulose, alcohol, chlorinated rubber, etc.) Can be removed by simply immersing in the appropriate solvent. Chemically crosslinked paints (epoxides, polyesters, MIXs, polyurethanes, alkyds) are soluble in special solvents, mostly higher aliphatic or aromatic hydrocarbons. The rate of softening of the paint then depends on the type of paint binder, the thickness of the lacquer layer, the temperature of the solvent. Paint residues must be removed mechanically.
a very efficient method of removing steel (aluminum is easily dissolved in sodium hydroxide and therefore this method is not applicable to aluminum) %. Thorough rinsing of the workpiece is necessary after the paint has been removed with hydroxides.
It is the same as mechanical cleaning of the substrate. It is possible to perform grinding, brushing, milling, blasting (which is also an adjustment for further painting). The disadvantage of blasting is that soft and thin substrates (eg thin sheets) cannot be blasted.
The painted part is heated to a temperature where the coating softens and can be easily removed mechanically. Removal of paint is never completely perfect, it requires additional mechanical cleaning, brushing and so on. It is not possible to tan products that are subject to deformation or joints. Higher temperature and prolonged action will cause pyrolysis (thermal decomposition), ie burning of the organic lacquer layer, which is carried out in special furnaces. Both methods are often used in removing paint hinges.
