Introduction to the Operating Principle of a Non-Curing Spray Machine

Release date:

Nov 28,2022

The primary working component of a non‑curing spray machine is a double‑acting pneumatic‑hydraulic booster pump, while its directional control mechanism is a specialized pilot‑operated, fully pneumatic valve‑switching device. When compressed air enters, as the piston reaches either the upper or lower end of the cylinder, the upper or lower pilot valve activates, instantly directing the airflow to shift the valve‑switching assembly and thereby driving the pneumatic motor’s piston in a stable, continuous reciprocating motion. This is because, in paint plunger pumps, the piston and plunger are rigidly connected, and the piston’s cross‑sectional area exceeds that of the plunger.

　　What is the operating principle of a non-curing spray machine? Let’s take a brief look together.

　　The primary working component of a non‑curing spray machine is a double‑acting pneumatic‑hydraulic booster pump, and its directional control mechanism is a specialized pilot‑operated, fully pneumatic valve‑switching device. When compressed air enters, as the piston reaches either the upper or lower end of the cylinder, the upper or lower pilot valve activates, instantly directing the airflow to shift the valve‑switching mechanism. This ensures stable, continuous reciprocating motion of the pneumatic motor’s piston. In the paint plunger pump, the piston and plunger are rigidly connected, with the piston’s cross‑sectional area larger than that of the plunger, thereby pressurizing the drawn‑in paint. The pressurized paint is then conveyed through a high‑pressure hose to an airless spray gun, where hydraulic pressure is released at the airless nozzle, causing instant atomization before being sprayed onto the substrate to form a coating.

Non-curing spray machine

　　What are the advantages of a non-curing spray machine?

　　1. The paint film boasts excellent quality, with a smooth, fine finish free of brush marks. It atomizes the coating into fine particles under pressure and evenly distributes them across the wall surface, resulting in a latex paint layer that is even, smooth, and densely packed—without any brush or roller marks—something traditional brushing or rolling simply cannot match.

　　2. High coating efficiency. A single operator can apply the coating at a rate of 200–500 m²/h, which is 10–15 times faster than manual brushing.

　　3. Excellent adhesion and long coating life. It employs high-pressure atomization to impart substantial kinetic energy to the sprayed paint particles, enabling them to penetrate into surface pores. This results in a denser paint film, enhancing the mechanical interlocking between the coating and the wall substrate, thereby improving adhesion and effectively extending the coating’s service life.

　　4. Uniform film thickness and high coating utilization. Manual brush‑on application yields highly uneven coatings, typically ranging from 30 to 250 microns, with low coating efficiency; in contrast, airless spraying can readily produce coatings as thin as 30 microns.

　　5. Easily reaches corners and crevices. Thanks to high-pressure airless spraying, the paint contains no entrained air, allowing it to penetrate even hard-to-reach areas such as corners, gaps, and uneven surfaces—particularly in office ceilings with numerous HVAC and fire‑protection pipes, where roller application is often challenging.

　　6. High-viscosity coatings can be sprayed, but they are also suitable for hand brushing and air spraying; however, these methods are only appropriate for low-viscosity paints. With economic development and changing consumer attitudes, using interior and exterior wall coatings to replace mosaics and ceramic tiles for wall decoration has become a popular trend in China. Water-based latex paint, prized for being non‑toxic, easy to clean, available in a wide range of colors, and environmentally friendly, has emerged as a favored material for both interior and exterior finishes. Nevertheless, latex paint is a waterborne coating with relatively high viscosity. During application, manufacturers typically impose strict limits on diluting the original paint with water—generally between 10% and 30% (except for specially formulated paints, which may allow substantial water addition without compromising performance; such details are usually noted in the product instructions). Over‑dilution can lead to poor film formation, adversely affecting the paint’s texture, scrub resistance, and durability, with the extent of degradation directly proportional to the degree of dilution: the greater the dilution, the poorer the resulting paint film. If the manufacturer’s recommended dilution ratio is strictly followed, the paint’s viscosity remains excessively high, making application difficult. For instance, roller coating, brush application, or air spraying may yield unsatisfactory results. Currently, abroad, the preferred method is high‑pressure airless spraying.

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