Do you really understand the structure of the KN95 mask? The big dragon mask is analyzed for you: medical masks and protective masks are non-woven materials, composed of directional or random fibers, generally multi-layer structure, usually referred to as SMS structure (2 layers S layer and 1 layer M layer ). At present, the highest number of layers in China is 5 layers, namely SMMMS (2 layer S layer and 3 layer M layer). S represents the spunbond layer (Spunbond), M represents the barrier layer or the meltblown layer M (Meltblown), which is composed of polypropylene (PP). The M layer uses meltblown nonwoven fabric as the filter layer. Because its fibers are randomly distributed and have complex three-dimensional pores, the biggest feature is that it is composed of ultrafine fibers, the specific surface area of the fiber is large, and the adsorption capacity of the particles is strong; The spray filter material fibers are randomly distributed to form a large number of tiny pores, and the pore distribution is uniform, the filtration resistance is small, and the filtration efficiency is high, so that the filtration performance of the non-woven medical protective mask is far superior to the traditional gauze mask.
SMS non-woven fabric uses polypropylene PP (with natural bacteriostasis and hydrophobicity) as the main raw material, and the fiber diameter can reach 0.5-10um. These ultrafine fibers with unique capillary structure increase the number and surface area of fibers per unit area, so that Meltblown cloth has good air filterability and is a good mask material. Therefore, the laser marking surface is S-layer polypropylene non-woven fabric.