Analysis of Meltblown Cloth Filtration Principle

Melt blown cloth is mainly made of polypropylene, and the fiber diameter can reach 1-5 microns. There are many voids, fluffy structure, and good anti-wrinkle ability. These ultrafine fibers with unique capillary structure increase the number and surface area of u200bu200bfibers per unit area, so that the meltblown cloth has good filterability, shielding, heat insulation and oil absorption. . It can be used in the fields of air, liquid filter materials, isolation materials, absorbent materials, mask materials, thermal insulation materials, oil-absorbing materials and wipe cloths. Applications: (1) Medical and sanitary cloths: surgical gowns, protective clothing, disinfection wraps, masks, diapers, sanitary napkins, etc.; (2) Home decoration cloths: wall coverings, table cloths, bed sheets, bedspreads, etc.; (3) Follow-up cloth: lining, adhesive lining, wadding, styling cotton, various synthetic leather base cloth, etc.; (4) Industrial cloth: filter material, insulating material, cement packaging bag, geotextile, covering cloth Etc.; (5) Agricultural cloth: crop protection cloth, seedling cloth, irrigation cloth, thermal insulation curtain, etc.; (6) Other: space cotton, thermal insulation materials, linoleum, cigarette filters, tea bags, etc. The meltblown cloth filter material is randomly distributed and bonded together by polypropylene microfibers. The appearance is white, flat and soft. The fiber fineness of the material is 0.5-1.0μm. The random distribution of fibers provides more thermal bonding between fibers. Opportunities, so that the melt blown gas filter material has a larger specific surface area, a higher porosity (≥75%). After high-pressure electret filtration efficiency, the product has the characteristics of low resistance, high efficiency and high dust holding capacity. The main material of meltblown non-woven fabric is polypropylene, which is a kind of ultra-fine electrostatic fiber cloth, which can capture dust. When the droplets containing pneumonia virus come close to the meltblown non-woven fabric, they will be electrostatically adsorbed on the surface of the non-woven fabric and cannot penetrate. This is how this material isolates germs. After the dust is captured by the ultra-fine electrostatic fiber, it is very difficult to be removed due to washing, and washing with water will also destroy the electrostatic dust collection ability. Therefore, this mask can only be used once. The meltblown process is a polymer extrusion nonwoven process. As a common way to use PP materials, the meltblown non-woven fabric produced is commonly known as the heart of a mask. It is the filter layer in the middle of a medical mask, which can filter bacteria and prevent the spread of germs. Its fiber diameter is only one-thirtieth that of a human hair. Although the raw materials are all polypropylene, there is a big difference in the production process and performance between the special materials for melt blown cloth and other non-woven materials. The special materials for melt blown cloth require that the raw materials must meet the high melt index (>1000g/10min) and molecular weight Narrow distribution.