Knowledge Center
A knowledge base organized around electrostatic coating selection, process tuning, troubleshooting, safety rules, and industry standards.
Selection GuideManual powder electrostatic spray gun spray powder, usually do not immediately judge that the spray gun is damaged, the high-pressure bag fails, or the controller is unstable. The so-called "spitting powder" is discontinuous in most cases, and the more common reasons are poor powder fluidization, excessive powder volume settings, powder tube bending and accumulating powder, powder pump or venturi tube wear, compressed air with water and oil, and concentrated spraying of powder tube residue after gun stopping. When troubleshooting, you should first confirm when the spitting powder occurs: whether it is a flush of powder at the moment of shooting, a large flush of small flush during the spraying process, or a sudden flush of powder after stopping the gun. The reasons and treatment methods for different manifestations are not the same.
Selection GuideThe electrostatic spray gun does not powder, not necessarily the high-pressure bag is broken. The site should first distinguish between two situations: first, the muzzle itself does not emit powder or powder intermittently, which usually gives priority to checking the air source, fluidization, powder pump, powder pipe, nozzle blockage and powder status; second, the muzzle has continuous powder fog, but the powder is not on the workpiece or poor adsorption, then focus on checking the grounding, electrodes, nozzle pollution, high-voltage cables, controller high-voltage output and high-voltage packages. The stronger signals of high-voltage package damage are usually high-voltage cannot be established, the actual voltage/current is abnormal, high-voltage alarm as soon as it is turned on, abnormal discharge, coke taste, ablation and carbonization, loss of pressure after heat engine, or failure with high-voltage module after single-variable replacement of the same model. Before completing these isolations, damage to the high-pressure package should not be directly judged.
Selection GuideWhen electrostatic plastic powder is seriously wasted, do not directly increase the voltage, reduce the amount of powder or replace the spray gun. It should first be confirmed which part of the "waste" occurs: excessive spraying, no first adhesion of powder, poor recycling of over-sprayed powder, large loss of color change and cleaning, excessive film thickness, rework and scrapping, or unclear metering caliber. The site should take the powder consumption of the unit qualified product as the core indicator, and compare the same conditions with the film thickness, coverage, recycled powder status, powder accumulation in the spray room and rework rate. Common troubleshooting directions include poor grounding, excessive powder fog, excessive gas delivery, inappropriate voltage or current restrictions, unstable gun spacing and angle, unreasonable pendant density, mismatched spray room air volume, damp powder clumping, powder pump powder tube wear, and improper management of recycled powder
Selection GuideCommon signs of possible damage to the electrostatic high-voltage package include: the actual voltage cannot be established after the controller sets the high-voltage; the voltage or current display abnormal jump; the alarm, short-circuit protection or overcurrent protection as soon as the high-voltage is turned on; there is no obvious charge adsorption at the spray gun end and the powder path is normal; abnormal discharge sound, coke odor, ablation, carbonization or breakdown traces occur near the spray gun or high-voltage line; the pressure is lost after a period of operation, and the cooler is briefly recovered; the failure still exists after replacing the same model, confirmed normal spray gun cable or gun body. The above can only indicate that the high-pressure bag is "highly suspicious" and cannot be directly confirmed. The actual isolation shall be in the order of “Ground — Powder — Electrode/Nozzle — High Voltage Cable — Controller — High Voltage Package”.
Selection GuideThe core function of an electrostatic powder spray gun is to stably deliver powder to the nozzle, giving the powder particles an electric charge. The electric field between the spray gun and the grounded workpiece then guides the charged powder towards the workpiece surface for deposition. The movement of the powder is not solely determined by electrostatics; the airflow, particle inertia, workpiece geometry, grounding status, and powder properties all contribute to the final result.
Selection GuideEnglish summary is being prepared. The full article is available in Chinese.
Selection GuideEnglish summary is being prepared. The full article is available in Chinese.
Selection GuideEnglish summary is being prepared. The full article is available in Chinese.
Process KnowledgeElectrostatic spraying voltage cannot be set using a fixed, one-size-fits-all value. First confirm the equipment type and manual specifications, then check grounding, gun distance, material feed, and atomization. Test incrementally based on flat surfaces, deep grooves, sharp corners, or recoating scenarios. Adjust only one variable at a time and record film thickness, appearance, and alarm conditions.
Selection GuidePractical guidance based on common on-site issues, covering diagnostic methods, parameter recommendations, and equipment selection boundaries.
TroubleshootingPractical guidance based on common on-site issues, covering diagnostic methods, parameter recommendations, and equipment selection boundaries.
