Product Knowledge
Why do meltblown fabric manufacturers need electrets? 2021-05-25
Melt blown cloth is the core material of the mask. The melt blown cloth is mainly made of polypropylene, and the fiber diameter can reach 1 to 5 microns. There are many voids, fluffy structure, and good anti-wrinkle ability. The ultra-fine fibers with unique capillary structure increase the number and surface area of fibers per unit area, so that the melt blown cloth has good filtration, shielding, heat insulation and oil absorption. It can be used in the fields of air, liquid filter materials, isolation materials, absorption materials, mask materials, thermal insulation materials, oil absorption materials and wipe cloths.

Micron is a magical unit. The diameter of an oxygen molecule is 0.346 nanometers, and oxygen can pass through smoothly. The diameter of a new coronavirus is about 100 nanometers, which is 0.1 micrometers, which is smaller than PM2.5 (particulate matter below 2.5 micrometers). At this time, the meltblown non woven fabric Like a net, passing through this layer of cloth is a piece of cake for a 0.1 micron virus.

The non-electret meltblown cloth virus can easily pass through, and the filtering effect is very limited, and it can only filter the air droplets.

The electrostatic electret is to add static electricity to the melt blown cloth. These charges can achieve the adsorption of small things through its attractive force. The virus will be adsorbed on the melt blown cloth due to static electricity, so that the average particle diameter of the mask is The filtration efficiency of (3±0.3)μm Staphylococcus aureus aerosol is not less than 95%.

The electret treatment electrostatic adsorption is to achieve the capture of the new coronavirus droplets (aerosols) through the Coulomb force of the charged fibers. The principle is to make the surface of the filter material more open, the ability to capture particles can be grabbed, and the charge density increases, and the adsorption and polarization effects of particles are stronger. Therefore, the meltblown non woven filter material of the filter layer must be passed through extreme treatment can achieve 95% filterability without changing the respiratory resistance to effectively prevent viruses. Masks must achieve the barrier effect while ensuring comfortable ventilation. The inhalation resistance of medical masks generally does not exceed 343.2 Pascals (Pa ), the inhalation resistance of civilian masks is less than 135 Pascal Pa). Electret treatment can greatly improve the filtration efficiency without changing the breathing resistance, and the higher the electret voltage, the higher the material filtration efficiency. Generally, the electret voltage is required to be 30Kv-60kv.

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