What are the requirements for a non-curing spray machine?
Release Date:
Jan 06,2023
What are the requirements for a non-curing spray machine? A non-curing spray machine is a coating method that utilizes the principle of corona discharge: under the influence of a high-voltage DC electric field, the damaged coating generates negative charges, which are then adsorbed onto positively charged substrates and discharged.
What are the requirements for a non-curing spray machine?
The non‑curing spray coating machine operates on the principle of corona discharge: under a high‑voltage DC electric field, the damaged coating acquires a negative charge and is attracted to the positively charged substrate, where it is discharged. Comprising a high‑voltage power supply, a spray gun, a spray cup, and other components, this type of equipment relies on electrostatic attraction—specifically, the grounded workpiece serves as the positive electrode, while the nozzle connected to the high voltage acts as the negative electrode. To achieve this, the nozzle equipped with an oil coating must pass through both upper and lower fuel‑injection chambers, which are fabricated from aluminum alloy and mounted on adjustable insulating walls. The gap between the spray nozzles can be uniformly adjusted to 0.2 mm. Additionally, the oil inlet pipe is installed at the center of the non‑curing spray machine, and two return‑oil pipes can be fitted at either end of the pipeline, maintaining a specified clearance from the steel strip.
During the design process, under zero-pressure conditions, the fuel spray jet is forced to flow downward toward the fuel injection nozzle, thereby generating a high‑voltage electrostatic field. The electrode produces a corona discharge, causing the atomized fuel mist to carry negative ions. Under the influence of the electrostatic field, charged particles are uniformly and rapidly adsorbed along the direction of the electric field lines, creating an enveloping effect on the passing rods. Non‑curing sprayers can also operate with a positive power supply; however, the critical voltage for negative‑polarity discharge is relatively lower, and such operation is more stable and safer, with a reduced risk of sparking.
The performance of a non‑curing spray coating machine depends not only on the equipment’s capabilities and the level of operational management, but also on whether the paint used meets the machine’s coating requirements. For non‑curing coatings, the coating’s resistivity should be relatively low, ideally in the range of 5 to 50 MΩ·cm. Coating resistivity is influenced not only by the resin content but also by the choice of solvent components. Consequently, during actual application, resistivity is typically adjusted by adding solvents. Non‑curing spray machines require coatings with lower resistivity, whereas commonly used coatings generally exhibit higher resistivity. To reduce coating resistivity, solvents with appropriate polarity are often incorporated into the formulation.
Non‑curing spray machine—air velocity in the spray booth is also critical. The booth’s exhaust system primarily removes solvent vapors generated during spraying, keeping indoor solvent vapor concentrations below the lower explosive limit of organic solvents to ensure operational safety. Air velocity inside the spray booth should be maintained between 0.3 and 0.7 m/s; excessively high velocities can compromise spraying performance. The exhaust system must be equipped with an air‑velocity control mechanism. Connect the red end of the high‑pressure spray gun hose to the red outlet of the left pump, and the blue end to the blue outlet of the right curing‑agent pump; attach the other ends according to the size of the spray gun nozzle openings. The red hose connects to the large‑diameter nozzle port, while the blue hose connects to the small‑diameter nozzle port. Double-check that the main‑component lines are properly connected to both the pump and the spray gun. Select a nozzle suitable for the working environment and the specific spray gun, then connect it and adjust the spray gun’s angle.
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