G4 DPA Bag type paint mist filter

DPA Bag type paint mist filter are widely used in spray booths and air filtration processes to intercept over spray and sludge generated from high-solid coatings, powder coatings, water-based coatings, multi-component coatings, colorants, and adhesives.

The primary material of the DPA paint over spray filter is specially treated glass fiber, but the secret lies in its overall structural design and chemical treatment.

Below is a detailed breakdown of the material composition and features of the DPA paint over spray filter:

Core Filtration Layer Material: Glass Fiber

Base Material: Glass fibers of specific diameters and lengths are used. This material exhibits non-stick properties, and inertness.

Non-Stick Property: This is the most critical characteristic. When wet paint particles come into contact with the glass fiber surface, they do not adhere to it. Instead, they continue to penetrate deeper into the filter with the airflow, where they are captured more thoroughly. This prevents the surface from clogging quickly, significantly extending the filter's service life.

It does not absorb moisture, maintaining the dryness and structural integrity of the filter material, thereby preventing collapse or failure due to water absorption.

Inertness: Chemically stable, it does not react with solvents or components in the paint, ensuring a stable and safe filtration process.

Structural Design: Three-Dimensional Maze Structure

The DPA filter is not a simple piece of filter cloth but is constructed from fluffy glass fibers into a thick, highly porous three-dimensional maze-like structure.

Working Principle: Paint over spray particles entering this maze are not simply "blocked." Instead, through mechanisms such as collision, interception, and diffusion, they are continuously captured by the fiber surfaces. Due to the non-stick property, the particles can move deeper into the filter until their kinetic energy is depleted, firmly locking them inside.

Advantage: This structure allows the filter to be utilized uniformly from the inside out, providing a very high dust-holding capacity (the amount of paint it can hold), far exceeding that of ordinary paper or cotton filters.

Chemical Treatment: Flame Retardant

Due to the presence of electrical equipment and organic solvents in spray booth environments, fire safety is paramount.

Flame Retardant Treatment: During manufacturing, special flame retardants are added to the glass fibers of DPA filters. This gives them self-extinguishing properties, meaning they will automatically extinguish after being removed from an open flame, significantly reducing the risk of fire. This is an important safety feature of DPA filters.

Frame Material

To maintain structural stability and facilitate installation, DPA filters require a sturdy frame.

Common Materials:Galvanized Steel Sheet: The most commonly used material, offering cost-effectiveness, sufficient strength, and a certain level of corrosion resistance.

Stainless Steel: Used in more corrosive or demanding environments, such as spray booths with high humidity or specific chemical environments.

The efficiency of currently available are 90%,and they can be selected based on specific requirements. The rational selection of filter efficiency and face velocity contributes to comprehensive economic benefits.

As dust accumulates on the filter media, the resistance increases. When the resistance reaches an unreasonable level, the filter must be discarded. Sometimes, excessive resistance can cause previously captured dust to become dislodged and re-enter the airflow; when this risk arises, the filter should also be replaced. The resistance of a filter increases with higher airflow rates. By increasing the surface area of the filter media, the relative velocity of air passing through the filter can be reduced, thereby decreasing the resistance.

Remarks: (1) Initial resistance tolerance of± 10% (2) Support customer size