1. Protective medical masks are generally made into a folding cone shape, which is our common N95 mask,
which needs to meet the national standard requirements of GB19083.
There are two core technical indicators of 0.3 microns diameter non-oily fine particles.
The filtering effect reaches 95 More than 2%,
the larger diameter 2 micron bacterial barrier must reach 100%, of course,
there are also high requirements for blood penetration resistance,
and its own breathability is also required.
This is usually used in severely infectious resources On occasion,
qualified N95 mask is usually composed of the following structure:
1-25-35 grams of water-repellent polypropylene spunbond non-woven fabric, this layer of material is mainly used to block droplets;
2-30-40 grams of water-repellent hot air non-woven fabric, this layer mainly provides support, so that the cone-shaped mask and the face will not collapse when tightened;
3-50-60 grams of electret meltblown cloth with electret masterbatch and electret high voltage electrical treatment, this layer is the most core part, only after the electret treatment is there a lot of charge on the meltblown cloth The charged 0.3-micron non-oily small particles have a high efficiency of adsorption, and usually require more than 95%. This is actually only tested by professional instruments. Some manufacturers also use two layers of 25-28 grams of electret processed melt Spray cloth to achieve the effect of 50-60 grams of electret melt spray cloth!
2. Medical surgical masks
About 1-25 grams of blue or green water-repellent polypropylene spunbond cloth, to get the effect of blocking the droplets!
2-25 grams can reach the BFE99 or BFE95 or more (BFE99 refers to 99% bacterial barrier) electret-treated meltblown cloth, this layer is mainly to block more than 95% bacteria and more than 30% 0.3 micron fine particles !
3-25 grams of hydrophilic polypropylene spunbond non-woven fabric, the main role is to absorb moisture.
The standard for medical surgical masks is the YY / T0469 standard, which is usually only available for manufacturers with formal medical device certificates. It is also scarce during the epidemic. It can be used by the second and third line staff of the hospital, and can also be used by ordinary people!