Thermal paint stripping
Pyrolytic treatment for the total removal of paint substrates.
The thermal paint stripping is carried out in special pyrolytic ovens at a temperature of about 450° C where the pyrolysis or self-combustion process takes place, in absence of oxygen. Pyrolysis is managed and monitored electronically (through time and temperature ramps) and allows cleaning without any alteration or deformation of all products or semi-finished products that are not sensitive to high temperatures. Not only paint is incinerated during this process, but also all types of resin, sealant, sludge, grease and bitumen.
The thermal paint stripping is suitable for both small and large products (up to about 9 meters) and is particularly suitable for cleaning the tools and accessories of painting systems (suspensions, grids, frames, hooks, racks, etc.) where the paint accumulates so long over time that it becomes unusable.
The thermal process is typically cheaper and faster than chemical stripping. When there are high layers of paint, even of various kinds, the chemical paint stripper has difficulty in penetrating and completely dissolving the entire coating, moreover the residue that is formed with the dissolution of the paint, would quickly saturate the paint stripping bath, requiring continuous filtrations and additions of new product until the process is complete; this involves a great economic impact and considerable quantities of chemical product to be used and disposed of.
This process is also useful for those artifacts with a cylindrical and complex shape, such as pipes and tanks, where even the internal parts are easily cleaned.
Once the pyrolysis process is finished, the excess ash left on the artifacts is removed by sandblasting or washing depending on the result the customer wants to obtain.
The combustion inside the ovens generates toxic gases and fine dust, unsuitable to be discharged into the atmosphere, for this reason they are first conveyed to a prostburner where, thanks to very high temperatures (850° C), complete combustion takes place which will develop carbon dioxide and water vapor that can be released into the environment. These combustors are now built in such a way as to recover the heat developed as much as possible and reuse it in the paint stripping process, allowing a good energy return.