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Requirements for Non-Curing Spraying 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: under the influence of a high-voltage DC electric field, the atomized paint acquires negative charges and is then attracted to a positively charged substrate, where it undergoes discharge. 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 nozzles, which are fabricated from aluminum alloy and mounted on an adjustable insulating wall. Within the gap of the grain‑feeding beam, the clearance can be precisely adjusted to 0.2 mm. Additionally, an oil‑supply line is incorporated inside, installed in the central section of the non‑curing spray unit, while two return lines are fitted at the upper and lower ends of the oil‑delivery nozzles, spaced at a specified distance from the steel strip.

During the design process, the fuel‑injector beam is engineered to channel the fuel to the 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, 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 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 in the coating, the 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 removes 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 between 0.3 and 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 equipment when used with rubber-modified asphalt.