Planar mask is efficient in filtering PM 2.5 and has the advantages of being high infiltration rate and low in choked flow with prominent obstruction and capturing capability for the PM 2.5
The three-layer structure comprises a polypropylene fiber spunbonded non-woven fabric outer layer, a superfine fiber electret melt-blown non-woven fabric middle layer and a polypropylene fiber spunbonded non-woven fabric inner layer in sequence from outside to inside
The mask is of a three-layer structure in a stacked mode