The normal medical mask contains 3 layers of non-woven fabric, spunbond + meltblown + spunbond. Meltblown fabric is the heart of the mask. It is the filter layer in the middle of the mask, which can filter bacteria and prevent the spread of germs. Melt blown fabric is a film made of high melt index polypropylene. The fabric is composed of many criss-cross fibers stacked in random directions.
