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filtration principle
The filtration principle of polyester nonwoven filter cartridges primarily involves two aspects: surface filtration and depth filtration, with surface filtration being the dominant factor. Below is a detailed explanation of the filtration principle:
- I. Surface Filtration Principle
Filter Layer Formation: When dust-laden air passes through the polyester nonwoven filter cartridge, most dust particles are deposited on the surface of the filter media, forming a filter layer. This layer further blocks subsequent dust particles in the airflow, preventing them from passing through the filter media surface.
High-Efficiency Filtration: The polyester nonwoven filter media, with its large specific surface area and microporous structure, effectively captures tiny dust particles. As dust accumulates on the filter media surface, the filter layer gradually thickens, enhancing filtration efficiency.
Low-Resistance Operation: Surface filtration maintains a low operating resistance for the filter cartridge because dust primarily deposits on the surface, avoiding excessive blockage of internal pores. This reduces power consumption in the dust removal system and improves overall system efficiency.
- II. Depth Filtration (Non-Dominant)
Although surface filtration is the primary mechanism for polyester nonwoven filter cartridges, depth filtration may occur in certain situations, such as when the surface filter layer becomes severely clogged or damaged. In these cases, some dust particles may penetrate the filter media surface and enter its interior. However, this depth filtration is not the primary filtration mechanism for polyester nonwoven filter cartridges and can increase resistance and operational costs.
- III. Special Treatment and Performance Enhancement
Membrane Coating: To further improve filtration efficiency and reduce resistance, some polyester nonwoven filter cartridges undergo membrane coating. A microporous film is bonded to the filter media surface, with inter-fiber gaps much smaller than the average particle size of dust, enabling almost all dust particles to be trapped on the surface of the film, achieving surface filtration.
Excellent Performance: Specially treated polyester nonwoven filter cartridges not only exhibit higher filtration efficiency but also possess excellent chemical resistance, heat resistance, wear resistance, and corrosion resistance. These properties ensure stable filtration performance and long service life even under harsh operating conditions.
In summary, the filtration principle of polyester nonwoven filter cartridges is primarily surface filtration, which blocks dust particles by forming an efficient filter layer. Additionally, special treatment techniques can further enhance filtration efficiency and overall performance.
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