Product Info

Melt blown nonwoven media use three core mechanisms impaction, interception, and diffusion combined with electrostatic charge to filter particles from <0.1 µm to >1 µm with high efficiency and low airflow resistance.

Main Content:
Melt blown nonwoven materials are essential in high-performance filtration, offering superior capability due to the synergy of multiple capture mechanisms:

Inertial Impaction (>1 micron):
Particles with higher mass cannot follow airflow around the fibers and collide directly due to inertia. Efficiency improves with faster airflow, larger particle sizes, and denser fiber structures.

Interception (0.1–1 micron):
Even when particles follow airflow, if they pass close enough to a fiber within one radius they are intercepted. Finer fibers and tighter packing increase this capture rate.

Brownian Diffusion (<0.1 micron):
Extremely small particles move randomly (Brownian motion), deviating from streamlines and colliding with fibers. Lower airflow speeds and longer dwell time improve efficiency.

Structural Advantage:
The melt blown process forms fibers 1–5 microns thick, randomly arranged to create complex air pathways. This maximizes contact without raising resistance, making the media both efficient and breathable.

Electrostatic Enhancement (Electret Treatment):
Through permanent electrostatic charge, fibers attract and trap both charged and polarizable particles. This is particularly valuable for the 0.1–1 micron range where mechanical capture is least efficient extending the effectiveness of filtration without increasing pressure drop.

Application:
These features make melt blown media ideal for various critical filtration needs, including surgical masks, N95 respirators, cleanroom filters, and HEPA air purifiers.

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❓ FAQ
Q: Why can melt-blown fabric filter very small particles?
A: Because Brownian diffusion and the electrostatic field from electret treatment capture nanoparticles effectively.

Q: Is electret treatment necessary?
A: Yes, for applications requiring fine aerosol filtration—such as N95 masks—because it increases efficiency without adding breathing resistance.

Q: What is the typical fiber size in melt-blown filters?
A: Generally 1–5 microns, though specialized processes can produce fibers as fine as 0.1 microns.

📚 Glossary
Inertial Impaction: Collision-based particle capture
Interception: Capture via near-surface contact with fibers
Brownian Diffusion: Random motion-based nanoparticle capture
Electret: Permanently charged fibers used to enhance filtration

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