Requirements for Non-Curing Spray Machines

Release date:

Sep 13,2021

The non‑curing spray coating machine operates on the principle of corona discharge, whereby the coated material, after being broken down, acquires a negative charge under the influence of a high‑voltage DC electric field and is then attracted to a positively charged substrate, where it discharges. The system comprises a high‑voltage power supply, a spray gun, a spray cup, and other components. By leveraging electrostatic attraction, the grounded workpiece serves as the positive electrode.

Non-curing spray machine It is a coating method that leverages the principle of corona discharge: after the coating is broken down, negative charges are generated under the influence of a high-voltage DC electric field and then adsorbed onto a positively charged substrate, where discharge occurs. The system comprises a high-voltage power supply, a spray gun, a spray cup, and other components. Non-curing spray machine It operates on the principle of electrostatic attraction: the grounded object being coated serves as the positive electrode, while the paint atomizer, connected to a high-voltage power supply, functions as the negative electrode.

This requires the oil‑coated nozzle to pass through both the upper and lower oil‑delivery lines. The oil‑delivery lines are fabricated from aluminum alloy and mounted on an adjustable insulating wall. Within the gap of the grain‑feeding beam, they can be precisely adjusted to a uniform clearance of 0.2 mm. Additionally, an oil‑supply pipe is installed in the interior, positioned at the central section of the non‑curing sprayer, while two return‑oil pipes are fitted at the upper and lower ends of the oil‑delivery lines, maintaining a specified distance from the steel strip.

During the design process, the fuel‑injector beam is engineered to channel the fuel to the injection nozzle under zero‑pressure conditions, thereby establishing a high‑voltage electrostatic field. At the electrodes, corona discharge generates negatively charged ions in the atomized fuel mist. Under the influence of this electrostatic field, the charged particles are uniformly and rapidly adsorbed along the direction of the electric field lines, depositing onto the passing rod and creating an enveloping effect. Non-curing spray machine Discharge using a positive‑terminal power supply is also feasible; however, discharge with a negative‑terminal power supply has a lower critical voltage and, during operation, exhibits greater stability and safety, making sparks less likely to occur.

The performance of a non‑curing spray coating machine depends not only on the equipment’s own capabilities and the level of operational management, but also on whether the type of coating used meets the machine’s application requirements. During non‑curing coating, the coating should have a low resistivity; a value of 5 to 50 MΩ·cm is generally optimal. In addition to being influenced by the resin content, the coating’s resistivity is also affected by the selected solvent components. Consequently, in practical applications, solvents are often added to adjust the coating’s resistivity as needed. Non-curing spray machine Coatings used for spraying are required to have low resistivity, whereas commonly used coatings typically exhibit relatively high resistivity. To reduce the resistivity of the coating, solvents with appropriate polarity are often added.

Non‑curing spray machine – The air velocity inside the spray booth is also critical. The exhaust system in the booth primarily serves to remove solvent vapors generated during spraying, keeping the indoor solvent vapor concentration below the lower explosive limit of organic solvents to ensure operational safety. The air velocity in the spray booth should be maintained within the range of 0.3 to 0.7 m/s; excessively high velocities can adversely affect the spraying quality. The exhaust system must be equipped with an air‑velocity control mechanism.

Features of the Non-Curing Spray Machine

Let me explain the characteristics of non-curing spray machines when used with rubber-modified asphalt.