To gain access to the procedure of painting parts it is necessary to prepare the parts to be painted. Surface preparation can be done by sandblasting or shot blasting the surface, and also chemical treatments are used. The chemical to be used is chosen depending on the material being processed. Design and manufacture of chemical pre-treatments are done with the cooperation and advice of top technologists of eminent companies in the field of metal.

• Chemical pre-treatment can be tunnel-type, or open tubs.
• Treatment of the parts is carried out by spraying at a pressure of 1.5 to 2 bar.
• The overall chemical pre-treatment is made of acid-resistant stainless steel.
• Ramps are made of polypropylene or acid-resistant stainless steel pipe hinge-valves with independent direction
• Recirculation pumps are centrifugal acid-resistant stainless steel solution with mechanical seals.

- Tunnel type

This concept of a chemical pre-treatment is applied mainly for pulse systems. A group of parts which is located in the tunnel is chemically treated and the whole process is carried out while the conveyor is stationary. Each agent has its own set of ramps and by a flow plane and flap system the chemical returns to its adequate tub. The mixing of liquids is practically excluded.

- Open tubs type

Depending on the type of metal that is chemically treated, chemical pre-treatment consists of several zones. Each zone is physically separated from the other. The mixing is reduced to a minimum because there are doors between zones. This concept is applied in continual plants.

Some chemicals need to be heated and this is achieved with stainless steel plate heat exchangers which are connected to an independent heating boiler. This system is located next to the tub. Regulation of the temperature and regulation of the chemical in the tub is done by digital temperature controllers or via PLC automatically.