Ultra-low resistance, plate-free, high-efficiency airflow filter

Airborne dust particles move due to inertial motion, random Brownian motion, or the influence of some field force. When these particles collide with other objects, the van der Waals forces (forces between molecules and molecular clusters) cause them to adhere to the fiber surface. Dust entering the filter medium has more opportunities to collide with it, and upon impact, it becomes stuck. Smaller dust particles collide and agglomerate to form larger particles that settle, resulting in a relatively stable concentration of dust particles in the air. This is why indoor surfaces and walls fade.

It is a misconception to view fiber filters as sieves.

Inertia and Diffusion

Particulate dust undergoes inertial motion in the airflow. When it encounters randomly arranged fibers, the airflow changes direction, and the particles, due to inertia, deviate from their original direction and collide with the fibers, becoming stuck. Larger particles are more likely to collide, resulting in better filtration.

Small dust particles undergo random Brownian motion. The smaller the particles, the more intense the random motion, the more opportunities they have to collide with obstacles, and the better the filtration effect. Particles smaller than 0.1 micrometers in the air primarily undergo Brownian motion; their small size results in good filtration. Particles larger than 0.3 micrometers primarily undergo inertial motion; larger particles have higher efficiency. Particles with little diffusion or inertia are difficult to filter. When measuring the performance of HEPA filters, the efficiency value for difficult-to-measure dust particles is often specified.

Electrostatic Effect

For various reasons, fibers and particles may become charged, generating an electrostatic effect. Electrostatically charged filter materials can significantly improve filtration efficiency. Reason: Static electricity alters the trajectory of dust particles, causing them to collide with obstacles; static electricity also makes dust adhere more firmly to the medium.

Materials that can generate static electricity are also called "electret" materials. Even with static electricity, the resistance remains unchanged, and the filtration effect is significantly improved. However, static electricity does not play a decisive role in filtration efficiency; it only plays a supporting role.

Ultra-Low Resistance, Plateless High-Efficiency Air Flow Filter

Dongguan Youte Purification Technology Co., Ltd. is a technology-based enterprise engaged in the research, development, production, and sales of purification equipment, including air filters, air showers, pass-through windows, air outlets, clean booths, laminar flow hoods, and negative pressure weighing hoods. Main products include: dry liquid tank type high-efficiency air outlets, integrated air outlets, FFU fan filter units, air showers and cargo showers, clean booths, clean workbenches, pass-through windows, primary and secondary filters, plated and plateless high-efficiency filters, liquid tank type high-efficiency filters, high-temperature resistant filters, and other purification equipment.