What is melt blown cloth? , Definition and production process of meltblown non-woven fabrics

According to the composition of non-woven fabrics, there are polyester, polypropylene, nylon, spandex, acrylic, etc.; different compositions will have completely different styles of non-woven fabrics. There are many production processes in the manufacture of non-woven fabrics. Melt-blown non-woven fabric is a process of melt-blown method. It is one of the non-woven fabric production processes, and it is also a method of direct polymer formation. The polymer melt extruded by the screw extruder is extremely stretched by high-speed and high-temperature air jet blowing or other means to form extremely fine fibers, which are then gathered on a web forming drum or a web forming curtain. A fiber web is formed, which is reinforced by self-adhesive action to make a melt-blown fiber non-woven fabric. Melt blown cloth is mainly made of polypropylene, and the fiber diameter can reach 1 to 5 microns. There are many voids, fluffy structure, and good anti-wrinkle ability. These ultra-fine fibers with unique capillary structure increase the number and surface area of u200bu200bfibers per unit area, so that the meltblown cloth has good filtration, shielding, heat insulation and oil absorption. . It can be used in air, liquid filter materials, isolation materials, absorbing materials, mask materials, thermal insulation materials, oil absorbing materials and wiping cloths. The fiber diameter of the melt-blown layer is extremely thin, basically about 2 microns (um), so it is only one-tenth of the diameter of the spunbond layer. The thinner the melt-blown layer, the more it can block the entry of tiny particles. For example, KN95 mask refers to Under normal circumstances, a flow of 85L can block 95% of the tiny particles (0.3um), which plays a vital role in filtering bacteria and preventing blood penetration, which is why it is called the heart of a mask.