FAQ

Powder spraying is a new coating process that involves spraying powder coating onto the surface of a workpiece using specialized equipment. After heating and curing, it forms a uniform, dense coating. Compared to traditional liquid coating, powder spraying offers advantages such as environmental friendliness, high efficiency, and superior coating quality. According to relevant industry reports, the application of powder spraying in the manufacturing industry has been increasing year by year in recent years, with more and more companies choosing this environmentally friendly and efficient coating method.

Process Steps

Pretreatment

Before powder spraying, workpieces require pretreatment to remove impurities such as oil and rust from the surface and improve coating adhesion. Common pretreatment methods include chemical treatment and mechanical treatment. Chemical treatment includes degreasing, phosphating, and passivation, while mechanical treatment involves polishing and sandblasting to remove surface impurities.

Powder Spraying

After pretreatment, the workpiece is transported to the spray booth, where the powder coating is evenly applied to the surface using powder spray equipment. During the spraying process, parameters such as spray thickness, speed, and angle must be carefully controlled to ensure coating quality. Hong Kong Standard Group Co., Ltd.’s electrostatic powder coating production line utilizes advanced electrostatic spraying technology, ensuring a more even adhesion of powder coating to the workpiece surface, improving spraying efficiency and quality. The company can manufacture large, medium, and small-scale, fully automatic, semi-automatic, and manual coating lines to meet the needs of various businesses.

Curing

After spraying, the workpiece enters the curing oven, where, under specific temperature and time conditions, the powder coating melts, leveling, and solidifies into a film. The curing process is critical to ensuring coating performance, requiring strict control of temperature and time. Generally, the curing temperature is between 180°C and 220°C, and the curing time is 10 to 20 minutes.

Post-Processing

After curing, the workpiece undergoes post-processing, including cooling and inspection, before being packaged and shipped. Post-processing further improves the coating quality and appearance, while also allowing for rework of substandard products.