Pleated Filter Design Innovations: Fine Particle Capture & Performance Upgrade

Innovations in Pleated Filter Designs for Fine Particle Capture

Pleated filters have seen numerous design innovations for fine particle capture, with common advancements in the following areas:

1. Filter Media Innovation

Multi-layer Media Design: Some pleated filters adopt a multi-layer media structure. For example, the windward side uses primary or intermediate efficiency filter media, while the other layer uses high-efficiency filter media. The primary or intermediate efficiency media is embedded with activated alumina particles loaded with iron and silver ions. These particles effectively remove harmful volatile organic compounds (VOCs) like formaldehyde and benzene from the air. Meanwhile, they reduce the porosity of the filter media, helping to improve filtration efficiency for fine particles.
Application of New Filter Media: New media with higher filtration performance have been developed and applied, such as nanofiber media. Nanofibers have an extremely small diameter and large specific surface area, enabling more effective capture of fine particles. They also maintain low resistance, enhancing both filtration efficiency and energy-saving effects.

Optimization of Pleat Parameters: For pleated filter cartridges with different outer diameters, the optimal range of arc length between pleats and the corresponding optimal pleat height range have been determined. For instance, when the outer diameter of a pleated filter cartridge is 160–350mm, the arc length between adjacent pleats on the outer circumference of the cartridge should be 3.9–4.5mm, and the pleat height should be 18%–25% of the number of pleats. This structural design reduces cartridge resistance and improves filtration efficiency.
Increased Filtration Area: The folding method and density of pleated filters are optimized to further increase the filtration area. A larger filtration area allows the filter to hold more fine particles, extending its service life while also improving filtration efficiency to a certain extent.

Integration of Electrostatic Action: Electrostatic elements are incorporated into the design of pleated filters to charge the filter media. Static electricity exerts an adsorption effect on fine particles, enhancing the filter’s ability to capture them. For extremely small particles in particular, electrostatic adsorption significantly improves filtration efficiency.
Integration of Other Purification Functions: Beyond fine particle capture, some pleated filters integrate additional air purification functions, such as odor removal and sterilization. For example, bactericidal substances are added to the filter media, or materials like activated carbon are combined to adsorb odors and harmful gases, achieving comprehensive air purification.

Modular Design: Pleated filters adopt a modular design for easy installation and replacement. Each module can be independently disassembled and installed. When a module malfunctions or needs replacement, there is no need to shut down the entire system. This minimizes impacts on production and daily life while reducing maintenance costs and complexity.
Self-Cleaning Function: Pleated filters with self-cleaning capabilities have been developed. Methods such as pulse backblowing and vibration are used to regularly and automatically remove dust and particles from the filter media surface. This restores the filter’s performance, extends its service life, and reduces the frequency and workload of manual maintenance.