1. The paint-saving principle of the HVLP spray gun

• Low-pressure atomization technology

The HVLP spray gun atomizes the paint through extremely low cap atomization pressure (usually less than 0.7 bar), reducing paint rebound and overspray (the phenomenon that the paint is lost without adhering to the workpiece). The high-pressure atomization of traditional spray guns will cause paint particles to rebound and scatter, while the low-pressure design of HVLP makes it easier for the paint to be adsorbed on the surface of the workpiece, and the transfer efficiency can reach more than 65%, which is much higher than the 30-40% of traditional spray guns.

• High-flow air compensation

Although the atomization pressure is low, HVLP replenishes energy through high-flow air (about 450 liters/minute) to ensure that the paint is fully atomized. This design not only ensures the spraying quality, but also avoids the waste of paint caused by high pressure.

• Reduce overspray

Overspray is the main cause of paint waste. HVLP's smooth spray width and precise atomization reduce the diffusion of paint mist, and are particularly suitable for spraying complex-shaped workpieces, such as depressions and other areas that are difficult to cover with traditional spray guns.

2. Environmental advantages

Reduced VOC emissions

HVLP's high transfer efficiency reduces the amount of paint used, indirectly reducing the emission of volatile organic compounds (VOC). For example, compared with traditional spray guns, HVLP can reduce solvent volatilization by 20-30%, meeting strict air quality management standards.

Reduce solid waste pollution

Reduced overspray means a decrease in the amount of paint residue and waste paint, reducing the environmental pressure of subsequent treatment. For example, after the automotive repair industry adopts HVLP, the cost of waste paint treatment can be reduced by 60%.

Compatible with environmentally friendly coatings

HVLP is suitable for spraying low-VOC coatings (such as water-based paints), further reducing the emission of harmful substances. The Hong Kong Environmental Protection Department's guidelines point out that HVLP is a key equipment for promoting water-soluble automotive repair paints.

3. Technical limitations and responses

High gas consumption requirements

HVLP requires a stable high-pressure gas source (the air compressor power needs to match), and the initial equipment cost is relatively high. It is recommended to choose a large-capacity air compressor (such as 15HP or above) to ensure stable air supply.

Paint viscosity limit

For high-viscosity paint (such as more than 18 seconds/coating-4 cups), the atomization effect is poor, and it is necessary to dilute or use LVMP (medium pressure low flow) spray gun.

Operation skills requirements

The spray gun needs to be kept 15-20 cm away from the workpiece, move at a constant speed, and avoid uneven fan overlap. Training can increase paint utilization by more than 30%.

4. The core advantages of HVLP spray guns

High material utilization rate

Low-pressure spraying reduces paint rebound and drift, especially suitable for expensive paints (such as car paint, wood paint), saving 20%~30% of costs.

Excellent spraying quality

Low-speed atomized particles can form a smoother coating, reduce the "orange peel" phenomenon, and are suitable for high-gloss surfaces (such as piano paint, furniture).

Environmental compliance

Meet the strict VOC (volatile organic compound) emission standards in Europe and the United States (such as the US EPA standard) to reduce pollution to the environment.

Operational flexibility

Suitable for complex curved surfaces and detailed spraying (such as automotive sheet metal, wood carving), because low-speed spraying makes it easier to control edge clarity.

Health and safety

Low pressure reduces the suspension of paint particles in the air, reduces the risk of workers inhaling, and improves the working environment.

Comparison table with traditional spray guns: