Meltblown cloth mainly uses polypropylene as the main raw material, and the fiber diameter can reach 1 to 5 microns. With many voids, fluffy structure, and good fold resistance, these ultra-fine fibers with unique capillary structure increase the number and surface area of fibers per unit area, thus making the melt-blown cloth have good filterability, shielding, heat insulation, and oil absorption . It can be used in the fields of air, liquid filtration materials, insulation materials, absorption materials, mask materials, thermal insulation materials, oil-absorbing materials and wipers.
Everyone knows that a medical mask contains a layer of melt-blown cloth, so what material is the medical mask melt-blown cloth made of?
1. The meltblown cloth used for masks is made of polypropylene material, and the meltblown cloth is made of another polypropylene material called high-melt fat fiber. It is an ultra-fine electrostatic fiber cloth, which can effectively use static electricity to absorb viruses, Dust and droplets are also important reasons why masks can filter viruses.
2. Medical masks generally adopt a multi-layer structure, referred to as SMS structure: a single layer of spunbond layer (S) on both sides. The middle is a single layer or multiple layers of meltblown layer (M). The best material for the meltblown layer is the meltblown cloth. It is the main material for mask virus filtering, which is the middle M layer-melt-blown non-woven fabric.
3. In fact, all three layers are non-woven fabrics, and the raw materials are polypropylene, but the production process is not the same. Among them, the fiber diameter of the spun layer on the inner and outer sides is relatively thick, about 20 microns; the diameter of the melt-blown fiber in the middle layer is only 2 microns, and is made of a polypropylene material called high-melt fat fiber. It is fragile and cannot be washed with water or sprayed with alcohol. Even if it is wet and dried, it will damage the fibrous tissue and cause loopholes. If the virus enters through the loophole, the mask will lose its protective ability.
With the severe situation of the current epidemic, masks have become an indispensable item in our daily life. Let us understand why masks can prevent viruses? First of all, the volume of coronavirus is 80-120nm, because it is generally attached to body fluids and ejected, so it is generally larger than 0.1um (0.1 microns (um) = 100 nanometers (nm)). The melt-blown cloth uses polypropylene as the main raw material and fiber The diameter can reach 0.5-10um, if it is virus attached to body fluid, it can be filtered out.
