Dust-free spray booth

Is a dust-free spray booth essentially a clean spray booth? In fact, a dust-free spray booth is based on the combination of a dry-type and an environmentally friendly dust-free spray booth, with an additional air purification system. Cleanliness is a crucial indicator for measuring the quality of a spray and baking booth, and this indicator is ensured by the air purification system. A dust-free spray booth is essentially a dry-type and environmentally friendly dust-free spray booth combined with an additional air purification system. The entire air filtration process in a dust-free spray booth involves a two-stage system, comprising primary filtration (inlet air filtration) and sub-high-efficiency filtration (ceiling filtration). The ceiling filter material is placed at the bottom of the static pressure chamber and supported by a top grid made of high-quality C-type steel. The steel grid undergoes special anti-rust treatment, ensuring excellent rigidity, no rust, and easy replacement of the ceiling filter.

Currently, dust-free spray booths are widely used in furniture painting processes. However, due to insufficient consideration in practical applications and imperfect purification technology, various enterprises face different issues. Common problems include the following:

(1) Unreasonable design of air supply and exhaust, resulting in poor exhaust effectiveness in the spray painting environment. This is mainly manifested as high resistance in the air supply filtration system, negative pressure generation, and localized dead zones. During spray painting, rebound paint mist causes secondary contamination of the workpiece, affecting product quality to some extent.

(2) An excessive focus on air supply and exhaust effectiveness leads to overly high air supply and exhaust volumes and pressure, thereby increasing equipment investment and operational costs. Especially for wood product manufacturers in northern regions, heated air supply is required in winter. Overly large air supply and exhaust fans result in greater heat loss, raising production costs. Generally, during design calculations, the intake air velocity should be controlled at 0.05 m/s, and the supply air outlet velocity at 0.35 m/s, based on which fan models are selected.

(3) Unreasonable layout of lighting in the dust-free spray booth and inadequate illumination fail to provide a suitable working environment for spray painting. Some enterprises even use non-explosion-proof lighting fixtures in the spray booth, posing serious safety hazards to production.

(4) Unreasonable purification methods for paint mist. For dry-type dust-free spray booths, many enterprises only perform primary treatment on the solid components of the paint mist, while the organic components are directly discharged into the atmosphere. Emission standards are often unmet, causing environmental pollution. For wet-type dust-free spray booths, some enterprises merely wash down the paint mist using a water curtain. The wastewater, after residue removal, is directly discharged, leading to secondary pollution of soil and water.

(5) Numerous issues also exist in design, manufacturing, and installation. The quality of workpiece fabrication and installation is often subpar, resulting in air leakage that significantly affects overall sealing effectiveness. Additionally, there are certain problems in the design of air supply and exhaust components, such as elbows, exhaust hoods, and variable-diameter ducts.