In modern industrial production, spraying technology is widely used in many fields such as automobile manufacturing, furniture coating, metal products, and electronic products. Among them, the spray gun distance, as one of the key factors affecting the quality of spraying, has a direct impact on the uniformity, adhesion, surface smoothness, and spraying efficiency of the coating. Therefore, mastering the method of adjusting the spray gun distance is of great significance for improving the quality of spraying.



One, The impact of spray gun distance on spraying effect



1. Coating thickness and uniformity

The distance between the spray gun and the workpiece surface directly affects the coverage rate and thickness of the spraying coating. When the distance is too close, the coating is concentratedly jetted, which is easy to cause the coating to be too thick, sagging, or orange peel; while when the distance is too far, the coating is over-dispersed, the coating becomes thin, and even issues such as missed spraying or uneven color may occur.



2. Spraying efficiency

Reasonably controlling the spray gun distance can improve spraying efficiency. A distance too far will increase the spraying time and cause waste of paint; while a distance too close requires frequent adjustment of position, increasing the difficulty of operation.



3. Surface quality and adhesion

The spray gun distance affects the atomization degree of the coating and its adhesion effect. The appropriate distance can ensure that the coating is fully atomized and well combined with the surface of the workpiece, thereby improving the adhesion and durability of the coating.



Two, Principles of adjusting the spray gun distance



1. Adjust according to the spraying material

Different types of coatings (such as solvent-based, water-based, powder coatings) have different viscosities and atomization characteristics. For example, coatings with higher viscosity require a slightly closer spray gun distance to enhance the atomization effect; while water-based coatings require an appropriate increase in distance to avoid affecting adhesion due to rapid evaporation of water.



2. Based on the type of spray gun and pressure setting

Different types of spray guns (such as air spray guns, high-pressure airless spray guns) have different sensitivity to distance. Air spray guns are usually recommended to be 15 to 25 centimeters away, while airless spray guns, due to their higher spraying pressure, can be appropriately increased to 30 to 40 centimeters.



3. Combine the shape and surface condition of the workpiece

For curved or uneven workpieces, the spray gun distance should be appropriately adjusted to avoid dead corners and missed spraying. At the same time, for substrates with high surface roughness, the spray gun should be slightly closer to enhance the adhesion of the coating.



Three, Suggestions for actual operation



- Maintain a stable distance: During the operation, the wrist should be stable, using uniform movement speed and a constant distance to avoid frequent changes in distance.

- Test spraying: Before the first spraying, tests can be conducted on waste materials or trial boards to observe the coating condition and adjust to the optimal distance.

- Training and experience accumulation: Spray gun operators should receive professional training and continuously summarize experience in practice to improve operational skills.



Four, Conclusion



In summary, the spray gun distance is an important parameter that cannot be ignored in the spraying process. Reasonably adjusting the spray gun distance not only helps to improve the quality of the coating but also enhances production efficiency and saves material costs. With the continuous development of spraying technology, the introduction of intelligent equipment also makes the control of spray gun distance more accurate and efficient. For personnel engaged in spraying operations, it is necessary to master scientific adjustment methods and combine them with practical operational experience in order to achieve better spraying effects in actual production.