Medical surgical masks generally have three layers, the inner and outer layers are non-woven fabrics, and the middle filter layer is melt-blown fabric. "meltblown non-woven fabric" is commonly known as the "heart" of the mask. It has good filterability, shielding, thermal insulation and oil absorption, and is an important raw material for the production of medical surgical masks and N95 masks.
The main raw material of meltblown non-woven fabric is polypropylene, which is an ultra-fine electrostatic fiber cloth with a fiber diameter of about 2 microns. Its diameter is only one tenth of the fiber diameter of the outer layer of the mask, which can effectively capture dust. When the droplets containing the virus are close to the meltblown non-woven fabric, they will also be electrostatically adsorbed on the surface and cannot penetrate. Therefore, it is a necessary raw material for the production of filter masks.
What is meltblown non-woven fabric?
Cut a used medical mask, you will find that the mask has three layers, (inner layer) moisture absorption layer, (middle layer) core filter layer, and (outer layer) water blocking layer.
Because according to the national production regulations, medical masks contain at least 3 layers of non-woven fabrics (N95 grade masks, structurally optimized: (middle layer) the core filter layer is more, and the thickness is thicker).
S layer: Polypropylene special resin (Sinopec) -Nonwoven Fabric Factory-Mask Factory
M Layer : Polypropylene special resin with high melt index (Sinopec)-Modified plastics factory (during epidemic prevention, Sinopec researched and produced special materials for meltblown fabrics)-Meltblown nonwoven fabric factory-mask factory.
meltblown non-woven fabric, commonly known as the "heart" of the mask, is the filter layer in the middle of the mask, which can filter bacteria and prevent the spread of germs. Melt-blown cloth is a film made of polypropylene with a high melt index. It is a film formed by laminating many criss-cross fibers in random directions. The fiber diameter ranges from 0.5 to 10 microns, and the fiber diameter is about 30 cents of the hair thread. one.
Although the raw materials of the S layer and M layer of the mask are polypropylene-specific resins, the melt-blown cloth special materials differ greatly from other non-woven materials in the production process and performance.
