KN95 protective face mask, disposable face mask, meltblown nonwoven produced in our company. Medical masks and protective masks are non-woven materials, which are composed of directional or random fibers. They are generally multi-layer structures, usually referred to as SMS structures (2 layers of s layers and 1 layer of M layers). At present, the highest number of layers in China is 5 layers, namely smmms (2 layers s and 3 layers m). S is spunbond layer, M is barrier layer or meltblow layer. Both are composed of polypropylene (PP).