Overview and production process of melt blown fabric
Melt blown nonwoven fabrics are mainly used as composite materials, filtering materials, insulation materials, sanitary products, oil absorbing materials, clean cloths (wiping cloths), battery separators, etc. They are widely used in fields such as medical and health, automotive industry, filtering materials, environmental protection, etc.
(1) Medical protection
Due to the high resistance to static water pressure, good breathability, and filtration effect of the composite material of melt blown fabric and spunbond fabric, especially the composite material with membrane, it has good barrier performance, and the filtration efficiency for non oily particles can reach over 99%.
If medical protective clothing is made of composite materials with a quantitative specification of 60-100g/㎡, it can effectively block microorganisms, particles, and fluids, and has a good protective effect on viruses like SARS (size 45nm) and HIV (size 90nm).
(2) Materials for air filtration
The melt blown composite material, which has undergone electrostatic polarization treatment, has the characteristics of low initial resistance, large dust capacity, and high filtration efficiency when used for air filtration. At a flow rate of 32L/min, the filtration efficiency for 0.3um particle size can reach 99.9%, with a resistance of only 117.7Pa (12mm water column). It is widely used for air purification treatment in electronic manufacturing, food, materials, chemical industry, airports, hotels, and other places.
Melt blown nonwoven fabrics are mainly used as composite materials, filter materials, insulation materials, sanitary products, oil absorbing materials, clean cloths (wiping cloths), battery separators, etc. They are widely used in fields such as medical and health, automotive industry, filter materials, environmental protection, etc.
(3) Materials for liquid filtration
Melt blown nonwoven fabrics can also be used as liquid filtration materials, capable of filtering particles with a diameter of 0.22-10um. Such as bacteria, blood, and macromolecules. Mainly used in the filtration of photosensitive and corrosion-resistant agents in the electronic industry, pharmaceutical, biological, and synthetic plasma products, beverages, beer, and Tangjiang filtration in the food industry, precision filtration of electroplating solution, water purification filtration in water plants, tap water purification filtration, hydrogen production equipment for electrolysis, and environmental wastewater filtration.
(4) Thermal insulation materials
Melt blown nonwoven fabrics have the characteristics of large specific surface area, small voids, and high void fraction. The required surface area of melt blown nonwoven fibers with an average diameter of 3um (equivalent to an average fiber density of 0.0638dtex (with a fiber size of 0.058 deniers) is 14617cm2/g, while the specific surface area of spunbond nonwoven fibers with an average diameter of 15.3um (equivalent to an average fiber density of 1.65dtex (with a fiber size of 1.5 deniers) is only 2883cm2/g.
Due to the much smaller thermal conductivity of air compared to ordinary fibers, the air in the pores of melt blown nonwoven fabric reduces its thermal conductivity. The heat loss transmitted through the fiber material of melt blown nonwoven fabric is minimal, and the static air on the surface of countless ultrafine fibers prevents heat exchange caused by the flow of air, making it have good insulation and insulation effects.
Polypropylene (PP) fiber is the variety with the smallest thermal conductivity coefficient among existing fiber materials. After special treatment (such as adding 35% high special (coarse denier) PET three-dimensional curled fiber), the melt blown thermal insulation floc made of PP fiber has a thermal insulation performance 1.5 times that of down and 15 times that of ordinary thermal insulation cotton. Especially suitable for making skiing clothes, mountaineering clothes, bedding, sleeping bags, thermal underwear, gloves, shoes, etc. Products with a quantitative range of 65-200g/m2 have been used to make warm clothing for soldiers in cold regions.
