Carbon steel spray-coated KONE elevator main rail guide shoe shell

The RAL spraying process is a coating method based on RAL color standard, which is widely used in various industries. Through unified color specifications, RAL spraying ensures the consistency of color of different products. It is durable, environmentally friendly and highly decorative. It is one of the mainstream choices for modern industrial coating.

Introduction to RAL spraying process

1. Standard RAL color card
A method for matching colors is the RAL color card. A unique number, such as RAL 9005 (black), is assigned to each color to guarantee color consistency across various products and applications.
With hundreds of standard colors available for easy coating process selection, this standard is widely utilized in both liquid and powder coatings.

2. Type of spraying process
RAL spraying process types that are frequently used include:
powder coating
The color paint is evenly applied to the metal surface by electrostatic powder spraying, and a strong, uniform coating is created by baking at a high temperature. Strong adhesion, good wear resistance, environmental protection, and solvent-free powder spraying are among the advantages of this technique.
Spraying liquid
Using a spray gun, uniformly apply liquid paint to the material surface. It works well for coatings that call for unique effects or several color gradients.

3. Spraying steps
Usually, the RAL spraying process includes
Surface preparation: Clean, degrease and remove the oxide layer of the product to ensure the adhesion of the coating.
Primer coating: To improve adherence and safeguard the material, a coat of primer may be sprayed on first if necessary.
Spraying: Use spraying equipment to evenly apply the color coating in accordance with the chosen RAL color card color. Liquid spraying is administered directly, whereas powder spraying is typically deposited electrostatically on the metal surface.
Curing: To create a hard and long-lasting coating, the workpiece must typically be heated to a high temperature after spraying. This is especially true for powder spraying. Spraying liquid will either dry spontaneously or at a low temperature.
Processing and quality control: The goods must be examined for homogeneity, consistency in color, and coating surface quality following spraying and curing.

4. Advantages
Color standardization: Use RAL color cards to ensure that the color is consistent in different products and batches.
Strong durability: Powder spraying, in particular, is ideal for outdoor settings since it is resistant to wear, corrosion, and UV rays.
Protection of the environment: Since powder spraying doesn't use solvents, it has a smaller environmental impact.
Robust ornamental effect: offers an extensive range of hues and various surface treatments (high gloss, matte, metallic luster, etc.).

5. Fields for applications
Automotive industry: coating of parts, frames, and accessories for both aesthetic and protective purposes.
In the construction sector, coatings that offer corrosion resistance and UV protection are applied to building components, window frames, doors, railings, and elevator accessories.
Home appliance industry: surface coating of the outer shell of home appliances such as washing machines and refrigerators.
Other industrial fields: such as mechanical equipment, furniture, lamps, etc.