Air purifying filters are mainly used in ventilation and air conditioning systems of industrial and civil buildings to remove solid particles, liquid water droplets, and gas pollutants from the air. It has a wide range of applications, from electronics, pharmaceuticals, food processing to automotive manufacturing and other fields. Its core lies in its filtration technology and the filter material used, which determines its filtration effect and scope of application.
The filtration technology of clean air filters mainly includes the following:
1. Inertial settlement
Principle: When particles in the air deviate from the direction of the airflow due to inertia, they will collide with the filter medium and be captured.
Advantages: Suitable for the removal of larger particles, high efficiency, and simple maintenance.
2. Electrostatic filtration
Principle: By utilizing the effect of static electricity, charged particles are adsorbed onto the high-voltage electrode when passing through an electric field, thereby achieving filtration.
Advantages: It can effectively filter small particles and is suitable for situations that require high purification levels.
3. Bag filter
Principle: By utilizing the pore structure of the cloth bag, particles in the air are removed through physical interception and capture. Bag filters are generally made of multiple layers of fabrics made of different materials.
Advantages: Strong filtering ability and long service life.
4. Activated carbon filtration
Principle: By utilizing the surface adsorption properties of activated carbon, organic gases and odors in the air are removed.
Advantages: It has excellent gas purification ability and is suitable for removing volatile organic compounds (VOCs).
5. Membrane filtration
Principle: By utilizing the microporous structure of the filter membrane, tiny particles are removed through physical interception.
Advantages: Strong adaptability, can choose membranes with different pore sizes according to different needs.
There are various types of filter media used in clean air filters, and different filter materials exhibit different performance in terms of efficiency, cost, and service life. Here are some common filter media and their characteristics:
1. Fiberglass
Characteristics: Glass fiber is widely used due to its excellent heat resistance and high filtration efficiency. It can effectively capture small particles and is corrosion-resistant.
Application: Commonly used in high-efficiency particulate air (HEPA) and high-efficiency particulate air (ULPA) filters.
2. Synthetic fibers
Characteristics: Synthetic fibers are generally lightweight and have good water and oil resistance, making them suitable for use in humid or oil mist environments.
Application: Suitable for various industrial applications, especially automotive manufacturing and spray painting processes.
3. Activated carbon
Characteristics: Activated carbon has a high specific surface area and can adsorb gases and odors.
Application: Commonly used for odor treatment, air purifiers, and smoke removers.
4. Non woven fabric
Characteristics: Non woven fabric is a new type of filter medium with good breathability and filtration properties, suitable for air filtration.
Application: Commonly used for medium efficiency filters and pre filters.
5. Membrane materials
Characteristics: Membrane materials usually have finer pore sizes, which help to capture small particles and can be designed according to requirements.
Application: Strict requirements for air purifiers and specific industries such as pharmaceuticals.
As an important equipment for improving air quality, the filtration technology and medium of a clean air filter directly affect its purification effect. In the process of selection and use, fully understanding different filtration methods and their material characteristics is particularly crucial for achieving efficient and economical air purification.