Part 1: Influence of infrared powder coating ovens on production quality in the rim painting sector; The infrared heating technology that we use in our products basically provides the heating of the material by transmitting the energy it has on the material or on the coating by the effect of the infrared radiation on the surface of the material which consists of the wavelength between 0.74 and 2 micron. This system provides nearly 80% efficiency compared to other energy transmission methods. As direct energy transmission to the target material passes, losses are minimal. Infrared ovens can be substituted in place of conventional systems for obtaining a smooth surface and homogeneous heating in the firing process in the rim painting sector.
In the first part of this article, we will discuss the use of infrared ovens in the rim painting industry. The most exposed parts of the motor vehicles are exposed to corrosion and external effects.
After the rims are painted with electrostatic powder paint, it enters the firing process for the boiling of the paint, where fossil fuel furnaces are generally used in the market, which brings disadvantages to manufacturers in installation maintenance, operation and product quality. By eliminating these disadvantages with infrared paint baking ovens, we provide manufacturers with great advantages.
Wheel powder coating, technological processes
In this article, the most detailed information about all technological processes used in rim powder coating is given. What is the purpose of this article, what is powder coating and what is the dyeing process? to answer questions.
These questions are frequently asked because few people know what powder coating is. The proof of this is that the customer asked the question mı Will my wheels shine after the paint? ’.
So what is powder coating?
Powder coating is a powder consisting of visually small particles. The pigmentation of these particles gives the powder a certain color. The powder coating is characterized in that the polymerization (infrared or gaseous) furnace achieves its properties after heat treatment at a temperature of about 200 ° C. Among the distinguishing features of the powder coating is its reliability, its resistance to external environmental influences, as well as the uniformity of the sheet and its flat deposition on the product during application.
Now let’s talk about the painting process.
First, powder coating consists of several stages. The first, very tiring and difficult stage – is the blasting of wheels. During sandblasting, the old paint of the rim is removed and corrosion is eliminated, while the surface of the rim is shagreened, which ensures better adhesion of the paint.
How is the process performed?
The discs are placed in the sandblasting chamber under a mixture of compressed air and sand or other abrasive material to remove the old paint, varnish. This procedure may vary depending on the presence or absence of the liner on the disc and also on its thickness.
The first important phase is over.
The name of the second stage – phosphating. Phosphating is the surface treatment of a disc; it is intended to form a stable anti-corrosion layer of several microns thick on the surface of the material.
The next step is degreasing the disc surface. The surface of the disc is degreased with any alkali-containing material or degreaser and left in the oven for 10-15 minutes. This process is called degasser and serves to remove gases from the metal surface, which may adversely affect paint quality in the future.
Powder primer can be applied after the discs have cooled after baking in ovens.
It is best to use zinc-containing powder primer because the presence of zinc in the primer protects the disc against further corrosion during operation. Powder coating is usually applied as powder coating using a special triboscopic or impulse gun. Powder primer and powder coating – powder, when particles are applied by a gun are charged by electromagnetic pulse and thus placed on the disk as if magnetized. After a suitable primer layer has been applied, it is placed in the oven maintained at a temperature of 200 ° C for a period of time.
Typically, 10-15 minutes is sufficient for primer polymerization. The discs are removed from the furnace and inspected for smoothness of all surfaces. If there are defects, the operations are repeated, until the surface becomes flat. As a result, any roughness manifests itself largely after painting. All defects and irregularities must be removed until powder coating is applied. That is, work is done by smoothing the surface by treating the liner layer. If irregularities become apparent and the liner is reduced to metal during the process, the surface is recoated.
The final stage of the powder coating application remains. This step is practically no different from the application of powder primer. The powder color is selected, poured into the gun and applied to the previously prepared surface of the disc. After applying the powder coating, the disc is placed in a curing oven. This process takes 15 to 20 minutes. The discs come out of the oven, cools down and is ready for use.