2023-01-16 https://www.aluminum-coils.com/a/coating-aluminium-pretreatment.html
By chemical cleaning agent and chemical conversion solvent, the oil and impurities of coil surface be cleaned, so that the aluminum coil surface forms a chemical transformation film, effectively ensuring the adhesion quality of the coating
For the , According to the conversion film processing process can be divided into spray, impregnated and no rinse three types.
Spray pretreatment of is the pressure of the agent through the nozzle sprayed to the surface of the aluminum coil, which in addition to the liquid and aluminum surface chemical action, there are mechanical granules, high efficiency, relatively short processing time, efficiency Is three times the pre-treatment of dipping, but the disadvantage is that the nozzle is easy to block, resulting in uneven spray, affecting the quality
Impregnation pretreatment of is the direct impregnation of the aluminum coil in the pharmaceutical, and the treatment solution contact reaction, the contact surface is complete, but the reaction time is relatively long, generally used in low-speed coating or low-speed separate extension of the production line
The rinse-free pretreatment of is a process that does not require water rinsing after treatment. The advantage is that the same kind of treatment can be used to treat a variety of coils and there is no problem of waste water discharge. The key is to uniformly apply the medicament to the surface of the aluminum plate. Dry film, to meet this requirement, you can use the roller coated or spray drying method for processing
The general continuous production line are used spray or no rinse roll, or spray and no rinse roll both the process.
