About the spray the powder process of valves/fittings, we have own spray the powder shop. Here we will introduce the processing flow for audience.
1, Aaction Principle
The powder coating is sprayed on the surface of the workpiece with the powder spraying equipment. Under the action of thermal heating, the powder will be uniformly adsorbed on the surface of the workpiece to form a powdery coating. The powder coating is cured by high temperature baking and leveling, and becomes the final coating with different effects; The spraying effect is superior to the spraying process in mechanical strength, adhesion, corrosion resistance and aging resistance.
2, Surface pretreatment. (such as valves, fittings)
The quality of the pre-treatment process directly affects the quality of the powder coating film, and the pre-treatment is not good, resulting in the coating film easy to fall off, bubbling and other phenomena. Therefore, the pre-treatment work must be paid attention to.
Protection (also known as masking).
If some parts of the workpiece are not required to have a coating, it can be covered up with protective glue before preheating to avoid spraying paint
Warm up.
If a thicker coating is required, the workpiece can be preheated to 200 ~ 230 ° C, which can increase the thickness of the coating.
3, Curing by baking.
The sprayed workpiece is heated in the drying room at 180 ~ 200℃ through the conveying chain, and the corresponding time is kept warm (15-20 minutes) to melt, level and cure, so as to get the surface effect of the workpiece we want. (Different powders are baked at different temperatures and times). This should be noted in the curing process.
4, Clean
After the coating has cured, remove the protective material and trim the burrs.
5, Examine
After curing the workpiece, the main daily check appearance (whether smooth and bright, there are no particles, shrinkage holes and other defects) and thickness (controlled in 55 ~ 90μm). Repair or re-spray the detected workpieces with leakage, pinholes, bruises, bubbles and other defects.
6, Packaging
The finished products after inspection are classified and placed in the transport vehicle and turnover box, and are isolated with flexible packaging buffer materials such as foam paper and bubble film to prevent scratches and wear (can be packed according to customer requirements).
Different products have different process requirements, if you have a relevant inquiry, please contact us, we will answer you in time.
Post time: Jan-18-2024