Process for aluminum profile vertical powder coating production line

First, the development and overview of vertical powder coating
Powder coating is a dry surface treatment procedure. After the fine pigment particles are electrostatically treated, they are sprayed on the product to form a coating, which is solidified by a curing oven to form a solid coating.
Since powder coating has:
1) The surface is beautiful, durable, scratch-resistant, chemically resistant to attack, and UV-resistant;
2) Environmental protection, no waste liquid discharge;
3) Perfect corner coverage;
4) Uniform color and wide range of spray colors;
5) The thickness is easy to control and thus is widely used.
Powder coatings and coatings began in the late 1930s. The polyethylene powder was initially applied to the metal surface in a molten state by flame spraying, which is the beginning of powder coating. Until the 1950s, after the invention of the invented powder bed coating process in Germany, the powder coating and coating process were greatly developed. China’s powder coating started relatively late. In 1989, Jiangsu Changzhou Huayi Aluminum Profile Factory introduced the US Nordson powder coating equipment, which is the first aluminum powder coating in China. However, with the economic reform and opening up, powder coating technology is available in China. Rapid development. In the early days, horizontal production lines were used. However, with the development of economic technology, Italy and Japan first introduced vertical spraying production lines and began to use them extensively. The vertical powder coating production line has developed into a mature product, from the pre-treatment of the melting, drying to the uniformity of the powder coating, and the curing effect to reach the advanced level in foreign countries, due to the small footprint of the vertical line, operation The number of employees is small, the uniformity of dusting and the solidified layer all achieve perfect results.
Second, the vertical powder coating production line process
Vertical powder coating production line The established powder coating production line consists mainly of pre-treatment, loading and unloading system, powder spraying system, powder recycling system, curing and drying part and automation control.
The working process is mainly divided into: pre-treatment→up load→spraying→cure→unloading→packaging.
1) The pre-treatment before the external treatment is mainly to clean the stain on the surface of the aluminum profile, and form a layer of chrome film on the surface to make the preliminary work for the powder spray.
Process: basket → degreasing → water washing → (alkaline etching) → water washing → surface adjustment (neutralization) → water washing → chromizing → water washing → hot (pure) washing → dripping dry → drying → sending spray shelves.
Among them: the concentration of degreasing, alkali etching, surface conditioning, and chromizing agent is based on the concentration provided by the supplier. The tap tank uses general tap water. Wash the hot water with pure water. (Alkaline etching can be used) The tank structure:
Degreasing tank: It is mainly used to clean the surface of the aluminum profile to prevent the adsorption of electrostatic powder on the surface of the aluminum material. The tank body is made of soft PVC, the main component of the bath is sulfuric acid, and the temperature is normal temperature. The size of the tank depends on the length of the largest profile and the yield.
Wash tank: Clean chemical residues from the previous process tank. The tank body is made of soft PVC, the main component of the bath is tap water, and the temperature is normal temperature. The size of the tank depends on the length of the largest profile and the yield.
Surface conditioning tank (neutralization): neutralizes the acidic substances remaining in the degreasing tank. The tank body is made of soft PVC, and the main component of the bath is 10 degrees to 60 degrees. The size of the tank depends on the length of the largest profile and the yield.