Air filter: multi-layer filtration process

In modern industry and daily life, air quality is directly related to people's health and equipment performance. With the enhancement of environmental awareness and the continuous advancement of technology, the multi-layer filtration process of air filters as an important part of air purification systems has received increasing attention. This article will explore the multi-layer filtration process of air filters in depth, revealing how it can efficiently purify the air and ensure our breathing health.

1. Basic concept of air filter element
Air filter element, as the name suggests, is a device used to filter impurities and pollutants in the air. It is widely used in automobile engines, industrial equipment, air conditioning systems, and household air purifiers. It effectively removes dust, pollen, bacteria, viruses, harmful gases and other pollutants in the air through physical barriers, adsorption, chemical reactions and other methods.

2. Principle and composition of multi-layer filtration process
The core of the air filter element lies in its multi-layer filtration structure. Each layer undertakes a specific filtration task, which together constitutes an efficient air purification system.

Primary filter layer: As the first line of defense for air entering the filter element, the primary filter layer usually uses coarse fiber materials, such as metal mesh or synthetic fiber cloth, which is mainly used to block large particles of dust, hair and other impurities, and extend the life of subsequent filter layers.
Medium efficiency filter layer: Located after the primary filter layer, the medium efficiency filter layer uses finer fiber materials, such as polyester fiber or non-woven fabric, which can effectively filter out fine particles in the air, such as dust, pollen, etc., and further purify the air.
High efficiency filter layer (HEPA layer): The high efficiency filter layer is the most critical part of the air filter element. It is usually made of ultra-fine glass fiber or polypropylene fiber, and the filtration efficiency of particles above 0.3 microns is as high as 99.97%. This layer can effectively block tiny pollutants such as bacteria, viruses, and smoke to ensure the cleanliness of the output air.
Activated carbon layer: Some high-end air filters will also add an activated carbon layer, using the strong adsorption of activated carbon to remove harmful gases, odors and volatile organic compounds (VOCs) in the air, further improving air quality.
3. Advantages of multi-layer filtration process
The multi-layer filtration process not only improves the filtration efficiency of the air filter, but also enhances its durability and adaptability.

High-efficiency purification: Through layer-by-layer filtration, the air filter can remove most pollutants in the air and ensure the cleanliness of the output air.
Extended life: The setting of the primary and medium-efficiency filter layers reduces the burden of the high-efficiency filter layer and extends the service life of the entire filter.
Strong adaptability: The multi-layer structure enables the air filter to be customized according to the needs of different application scenarios, meeting various air purification needs from industry to home.