Overview and production process of melt blown cloth

　　Melt-blown nonwovens are mainly used as composite materials, filter materials, insulation materials, sanitary products, oil-absorbing materials and clean cloths (wipes), battery separators, etc., and are widely used in medical and health, automotive industry, filter materials, environmental protection And other fields.

　　It can be seen that in foreign countries, melt-blown non-woven fabrics are mainly used as two-step SMS materials and medical and health materials and coating materials. In addition, wiping and absorbing materials, filtering and barrier materials are also important uses of melt-blown fabrics. The specifications of meltblown nonwovens for various typical uses are shown in Table 1-8, and the application fields and shares of domestic meltblown nonwovens are shown in the table.

　　(1) Medical protection

　　Because the composite material of meltblown cloth and spunbond cloth has high hydrostatic pressure resistance, good air permeability and filtering effect, especially the material composited with membrane, it has good barrier performance and filtering efficiency for non-oily particles It can reach more than 99%.

　　For example, medical protective clothing made of composite materials with a quantitative specification of 60-100g/㎡d can effectively block microorganisms, particles and fluids, and is very good for SARS viruses (45nm in size) and HIV viruses (90nm in size). The protective effect.

　　(2) Materials for air filtration

　　The melt-blown composite material treated by electrostatic electret has low initial resistance, large dust holding capacity and high filtration efficiency when used in air filtration [Under the state of 32L/min flow rate, the filtration efficiency for 0.3um particle size can reach 99.9 %, resistance is only 117.7Pa (12mm water column)] and other characteristics, widely used in electronic manufacturing, food, materials, chemicals, airports, hotels and other places of air purification treatment.

　　Melt-blown non-woven fabrics are mainly used as composite materials, filter materials, thermal insulation materials, sanitary products, oil-absorbing materials and clean cloths (wiping cloths), battery separators, etc., and are widely used in medical and health, automotive industry, filter materials, and environmental protection. And other fields.

　　(3) Materials for liquid filtration

　　Melt-blown non-woven fabric can also be used as a liquid filter material, which can filter particles with a particle size of 0.22~10um. Such as bacteria, blood and macromolecular substances. It is mainly used in the filtration of photosensitive resists in the electronics industry, the filtration of pharmaceutical, biological, and synthetic plasma products in the pharmaceutical industry, the filtration of beverages, beer and Tangjiang in the food industry, the fine filtration of electroplating solutions, the filtration of water purification in water plants, and the purification and filtration of tap water. Click the water hydrogen production device, environmental wastewater filtration, etc.

　　(4) Thermal insulation materials

　　Meltblown nonwovens have the characteristics of large specific surface area, small voids, and high porosity. For example, the meltblown nonwoven fiber with an average diameter of 3um [equivalent to an average fiber linear density of 0.0638dtex (fineness of 0.058 denier)] has a variable area of 14617cm2/g, and an average diameter of 15.3um [equivalent to average fiber The specific surface area of the spunbonded nonwoven fiber with a linear density of 1.65dtex (1.5 denier) is only 2883cm2/g.

　　Since the thermal conductivity of air is much smaller than that of ordinary fibers, the air in the pores of the melt-blown non-woven fabric makes the thermal conductivity smaller, and the heat loss through the fiber material of the melt-blown non-woven fabric is very small, and The still air on the surface of countless ultra-fine fibers prevents heat exchange due to the flow of air, so that it has a good heat insulation and heat preservation effect.

　　Polypropylene (PP) fiber is the smallest thermal conductivity of existing fiber materials. It is a melt-blown thermal flake made of PP fiber after special treatment [such as adding 35% of high-tech (coarse) PET three-dimensional crimped fiber] , The thermal insulation performance is 1.5 times that of down and 15 times that of ordinary thermal cotton. Especially suitable for making ski suits, mountaineering suits, bedding, sleeping bags, thermal underwear, gloves and shoes, etc. Products with a basis weight of 65~200g/m2 have been used to make warm clothing for soldiers in cold regions.

　　(5) Oil-absorbing material

　　Because PP fiber has good hydrophobicity and lipophilicity, low density (0.91g/cm3), low water absorption (0.01%), and moisture regain of 0.05%, it has stable chemical characteristics such as insoluble in oil and acid and alkali resistance. Very good oil-absorbing material. The oil absorption of the meltblown nonwoven fabric produced from PP raw materials is 15-17 times its own weight, and the water absorption is 0.71~1 times its own weight. It has the characteristics of fast oil absorption, long-term floating on the water surface after oil absorption, and reusability. It is currently the most commonly used oil-absorbing material.

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