Is the meltblown cloth mask a medical mask?

Melt-blown material is a non-woven fabric produced by melt-blown method, and its thickness is relatively thick. The random arrangement of fibers and interlayers forms a multi-bend channel structure of meltblown materials, so that particles (COVID-19 aerosol) will collide with fibers and be twisted. We were consulted by the meltblown fabric testing organization. Key points: The filtering mechanism of medical masks is Brownian diffusion, interception, inertial collision, gravity settlement and electrostatic adsorption. The first four are all physical factors, that is, the natural characteristics of non-woven fabrics produced by melt blowing, and the filterability is about 35%; This can't meet the requirements of medical masks. We need to carry out electret treatment on the material to make the fiber charged, and capture the aerosol where COVID-19 is located by electrostatic.

Electrostatic adsorption is to capture COVID-19 droplets (aerosols) through the coulomb force of charged fibers. Its principle is to make the surface of filter material more open, which can capture particles, and at the same time, the charge density increases, which has a stronger adsorption and polarization effect on particles. Therefore, the melt-blown nonwoven filter material of the filter layer must be treated by electret to achieve 95% filterability without changing respiratory resistance and effectively prevent viruses.

Masks should achieve barrier effect while ensuring comfort and ventilation. The inhalation resistance of medical masks is generally less than 343.2 pascal (Pa), and that of civilian masks is less than 135 Pascal (Pa).

Mask production solves the problem of raw materials, but mask production is only stacking work and materials to maintain the production capacity of the production line. This is very fast. They are all automated production lines. Let me show you a video. 1.85 million masks (machines) can produce 1.000 masks per minute, and can produce 1.44 million masks per day without stopping for 24 hours.

If it is an ordinary mask, it does not need to be disinfected, but if it is used for medical purposes, the manufacturer needs to use eo disinfection cabinet for disinfection. The mask was placed in the environment of 400mg/l ethylene oxide, and the micro-biological macromolecules were inactivated by alkylation on hydroxyl groups to achieve the purpose of sterilization. However, ethylene oxide is not only flammable and explosive, but also toxic to human body, so it needs to be placed for analysis for 7 days after disinfection. After the eo residue is lower than the required value, it can be packaged and provided to medical staff. Therefore, the unit that produces medical masks needs to have a Medical Device Business License! Therefore, mask manufacturers need to send masks to the Quality Supervision Bureau for inspection, which meets the requirements of gb and ISO1135: 2014, because ethylene oxide is also a carcinogen!