The Advantages of High-Pressure Airless Sprayers Over Regular Sprayers
High-pressure airless spraying: This is an efficient method of spraying that differs from regular air spraying. It uses a high-pressure pump to pressurize paint to around 15MPa, which is then transported via high-pressure hoses to an airless spray gun. At the nozzle of the gun, the hydraulic pressure is released and rapidly expands into a fine fan-shaped mist directed towards the surface. Since the paint does not contain air, this process is called "airless spraying" or simply "airless". High-pressure airless spraying is suitable for both regular paints and especially for high-viscosity paints.
Regular air spraying: This method uses compressed air blown out of an air spray gun's nozzle. The fast-moving airflow creates a vacuum that draws liquid paint through a suction tube, mixes it thoroughly with the compressed air, and sprays it out of the nozzle as a mist, forming a coating on the object being painted. Air spraying is a common type of spray process. Because compressed air is sprayed along with the paint, this is called "conventional spraying" or "air spraying", with commonly used air pressures ranging from 0.4-0.6MPa.
Key features of airless spraying include:
(1) High-pressure atomization that can spray high-viscosity coatings without additional thinners, saving on expensive thinners.
(2) Thick film formation, high coverage rate, excellent quality, and high gloss. One pass can meet design requirements, making the construction efficiency twice as high as regular spraying.
(3) Minimal paint splatter, with usage rates over 70%, resulting in relatively less pollution.
(4) No air moisture or impurities in the paint, leading to strong adhesion.
(5) Compact equipment, easy to move, small compressor, and lightweight.
(6) Less paint mist improves working conditions, is more environmentally friendly, and enhances worker safety.
Conclusion: If the goal of painting is high efficiency, high quality, and corrosion resistance, airless spraying should be selected.
Features of air spraying include:
(1) Negative pressure suction where high-viscosity paints cannot be drawn in, preventing the spraying of high-solid, high-viscosity paints. Expensive thinners must be added to reduce viscosity.
(2) Thin film layers requiring multiple coats, leading to low construction efficiency.
(3) High paint splatter with utilization rates of approximately 30%, leading to significant waste and pollution. Paint wastage is higher than brushing or rolling due to some paint dispersing during spraying, especially in windy outdoor conditions.
(4) Using compressed air to atomize the paint may introduce moisture and impurities into the film, reducing paint adhesion and affecting coating quality.
(5) Feeding cups and buckets or dual hose systems increase the weight of the spray gun, increasing operator fatigue. Additionally, constantly refilling the paint takes time and is uneconomical.
This spraying method is much more efficient than brush or roller applications and provides a more even layer thickness, but its drawbacks are also evident.
High-pressure airless spraying equipment can be divided into two types based on power source: electric and pneumatic. Electric models use 220V AC power, do not require compressed air, and produce low noise, making them suitable for workshop use and mobile field operations. Pneumatic models use 3-8kg/cm2 compressed air and are suitable for both workshop and outdoor site work. In areas without power or in mobile environments, gasoline engine-driven high-pressure airless spray machines can still operate effectively and conveniently.
Article Tags: High-pressure Airless Sprayer
Source: www.dfc168.com
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