Electrostatic spray guns operate based on the principle of electrostatic attraction. In this system, the object to be painted acts as the anode and is grounded, while the paint atomizer or electric grid serves as the cathode. A high-voltage electrostatic field is created between the two electrodes, causing a corona discharge at the cathode. This discharge charges the paint particles, which are then further atomized. Due to the principles of like-charge repulsion and opposite-charge attraction, the charged paint particles are drawn toward the object along the electric field lines. Once they reach the surface, they adhere after discharging. Notably, even the backside of the object can be coated effectively due to the electrostatic effect.
Maintaining an electrostatic spray gun is essential for ensuring both safety and performance. Regular checks should be performed on the resistance of the spray gun, the power supply, and the internal components to ensure everything is functioning properly. Seals must be inspected for damage or leaks, and any faulty parts should be replaced promptly. To maintain optimal spraying results, it's important to regularly test key parameters such as voltage, flow rate, atomization quality, and overall spray pattern. A specialized instrument can be used to measure the voltage and confirm that it meets the required standards. If the electrode needle shows signs of wear or damage, it should be fully discharged and replaced if necessary. For spray guns with built-in generators, it’s crucial to monitor the generator’s performance frequently to avoid malfunctions.
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Tag: spray gun working principle, paint resistance, cathode
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