The paint mist filter box plays a key environmental protection role in the painting operation. However, during its operation, increased resistance is a common problem. Understanding the factors that cause increased resistance is essential to ensure the normal operation of the paint mist filter box and improve its work efficiency.
As the paint mist filter box operates, the filter material will continuously intercept paint mist particles. When the paint mist particles gradually accumulate on the surface and inside of the filter material, when they reach a certain level, they will block the pores of the filter material. This is like the mesh of the sieve being blocked, and the passage for air to pass becomes smaller, resulting in increased resistance. For example, in some workshops with a large amount of paint spraying, if the filter material is not replaced in time, the resistance of the filter box will increase significantly after a period of operation.
Different types of paint have different viscosities, and paint mist with greater viscosity is more likely to adhere to the filter material. These sticky paint mists will not only block the pores of the filter material, but also form a sticky film on the surface of the filter material, further hindering air circulation. For example, some paints with more resin components have higher paint mist viscosity, which is more likely to cause increased resistance in the filter box during the filtration process.
According to the principles of fluid mechanics, excessive wind speed will complicate the flow state of air in the filter box, increase the friction between the air and the filter material and the internal components of the box. At the same time, excessive wind speed will cause paint mist particles to hit the filter material at a greater speed, causing more paint mist particles to adhere to the filter material, speeding up the clogging speed of the filter material, and thus increasing the resistance. Generally speaking, when the ventilation system of the paint shop is not designed reasonably, or when the painting speed is excessively increased in pursuit of high output, the wind speed is likely to be too high, resulting in increased resistance of the paint mist filter box.
In addition to paint mist particles, dust in the air will also enter the paint mist filter box. Over time, dust will accumulate at the bottom, corners, and surface of internal components of the filter box. These dust accumulations will affect the normal flow path of the air, making the air flow in the filter box turbulent and increasing the resistance of the air flow. Especially when there is a lot of dust accumulation, the air channel may be partially blocked, resulting in a significant increase in resistance.
After the paint mist filter box has been running for a long time, its internal filter materials, fans, air ducts and other components will gradually age. For example, the filter material may have fiber breakage and deformation, which will cause changes in its pore structure, reduce air permeability and increase resistance. Aging of the fan may lead to insufficient air volume. In order to maintain a certain ventilation effect, the system will automatically increase the wind pressure, thereby increasing the resistance of the filter box. Aging of the air duct may cause air leakage and deformation, which will affect the normal flow of air and also increase resistance.
Ambient humidity also affects the resistance of the paint mist filter box. When the ambient humidity is high, the moisture content in the paint mist increases, and the paint mist particles are more likely to adhere to each other to form larger particles, which are more likely to clog the filter material. At the same time, a high humidity environment may also cause the filter material to become damp, resulting in a decrease in its performance and an increase in resistance. For example, in some humid areas in the south, the paint mist filter box is more likely to have increased resistance during the rainy season.
During the operation of the paint mist filter box, factors such as filter material blockage, paint mist viscosity, excessive wind speed, dust accumulation in the filter box, equipment aging and ambient humidity will all lead to increased resistance. Understanding these factors and taking corresponding measures, such as regularly replacing filter materials, controlling paint spraying wind speed, keeping equipment clean, doing equipment maintenance, and adjusting ambient humidity, can effectively reduce the resistance of the filter box, ensure its normal operation, and improve the paint mist treatment effect.
