ã€China Aluminum Network】 1. Development and Overview of Vertical Powder Coating
Powder spraying is a dry surface treatment procedure. After the finely-divided pigment particles are electrostatically treated, they are sprayed on the product to form a coating, which is then cured to form a solid coating.
Due to powder coating has:
1) The surface is beautiful, durable, scratch-resistant, chemical-resistant, and UV-resistant;
2) Environmental protection, no waste liquid discharge;
3) Perfect corner coverage effect;
4) Uniform color and wide range of spray colors;
5) The thickness is easy to control and is therefore widely used.
Powder coating and painting began in the late 1930s. The flame spraying method was used to apply the polyethylene powder to the metal surface in a molten state. This is the beginning of powder coating. Until the 1950s, after Germany's invention of the fluidized bed dip coating method, the powder coating and the coating process were greatly developed. China's powder coating started late. In 1989, Changzhou Huayi Aluminum Profile Factory introduced the American Nordson powder spraying equipment, which is the front of China's aluminum powder spraying, but with the economic reform and opening up, powder coating technology has been obtained in China. Rapid development. Early adopters were horizontal production lines, but with the development of economic technology, Italy and Japan first introduced vertical spraying production lines and began to be widely used. The vertical powder coating production line has been developed into a mature product, and the uniformity of the pretreatment, drying and dusting coating, as well as the effect of curing, have reached the advanced level in foreign countries, due to the small footprint of the vertical line, operation Fewer workers, uniform dusting, and cured layers all achieve perfect results.
Second, the vertical powder coating production line process
The vertical powder spraying production line of the process group is mainly composed of the pre-treatment, the upper and lower material conveying system, the powder spraying system, the powder recovery system, the curing and drying part, and the automatic control part.
The work process is mainly divided into: pre-treatment → on the shelf → spray → curing → unloading → packaging.
1) The pre-existing treatment is mainly to clean the stains on the surface of aluminum profiles, and form a layer of chromium film on the surface to make the dusting work a good job.
Process flow: basket → degreasing → washing → (alkaline etching) → washing → surface adjustment (neutralization) → washing → chromate → washing → hot (pure) washing → drip drying → drying → send spraying.
Among them, the concentration of degreasing, alkaline etching, surface modification, and chromizing agent is based on the concentration tank provided by the supplier. Wash tank with general tap water. Hot water wash with pure water. (alkaline erosion can not use) tank structure:
Degreasing tank: It is mainly used to clean the surface of aluminum profiles to prevent the adsorption of electrostatic powder on the surface of aluminum. Anti-corrosion of the tank body adopts soft PVC. The main component of the bath is sulfuric acid, and the temperature can be normal temperature. The tank size depends on the length of the larger profile and the yield.
Rinse tank: Clean the chemical residue from the last tank. Anti-corrosion of the tank adopts soft PVC. The main component of the tank fluid is tap water, and the temperature can be normal temperature. The tank size depends on the length of the larger profile and the yield.
Table adjustment (neutralization): Neutralization due to acid residues in the degreasing bath. The tank body is anticorrosive with soft PVC. The main component of bath fluid is 10 to 60 degrees. The tank size depends on the length of the larger profile and the yield.
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