What else can meltblown non-woven fabrics do besides masks?

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, environmental protection And other fields.


In foreign countries, melt-blown non-woven fabrics are mainly used as two-step SMS materials and medical and sanitary materials and coating materials. In addition, wiping and absorbing materials, filtering and barrier materials are also important uses of melt-blown fabrics.


1. Medical protective equipment


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 it has good barrier properties against non-oily particles. The filtration efficiency can reach more than 99%.


For example, medical protective clothing made of composite materials with a quantitative specification of 60～100g/m2 can effectively block microorganisms, particles and fluids, and is resistant to similar SARS viruses (size 45nm) and HIV viruses (size 90nm) Have a good protective effect.


2. Air filtration materials


The meltblown 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 of 0.3μm particle size It can reach 99.9% and the resistance is only 117.7Pa (12mm water column)]. It is widely used in the air purification treatment of electronic manufacturing, food, beverage, chemical industry, airport, hotel and other places.


Filter devices of various air-conditioning equipment, medical high-performance masks, and filter bags for dust collectors can also be made of this material.


3. Materials for liquid filtration


Meltblown nonwoven fabric can also be used as a liquid filter material, which can filter particles with a particle size of 0.22～10μm. 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 syrups in the food industry, the fine filtration of electroplating liquids, the filtration of water purification in water plants, the purification and filtration of tap water, and the electrolysis. Filtration devices for hydrogen production from water, environmental wastewater filtration, etc.


PP melt-blown non-woven fabric with hydrophilic properties can be used to make battery separators for mobile phones.


4. Thermal insulation materials


Meltblown nonwovens have the characteristics of large specific surface area, small voids (pore size ≤20μm), and high porosity (≥75%). For example, the specific surface area of u200bu200bthe meltblown nonwoven fiber with an average diameter of 3μm [equivalent to an average fiber linear density of 0.0638dtex (fineness of 0.058 denier)] is 14617cm2/g, and an average diameter of 15.3μm [equivalent to an average fiber line The specific surface area of u200bu200bthe spunbonded nonwoven fiber with a density of 1.65 dtex (with a fineness of 1.5)] is only 2883 cm2/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. In addition, the static air layer on the surface of countless microfibers prevents heat exchange due to the flow of air, so that it has a good heat insulation and warmth retention effect.


Polypropylene (PP) fiber is the lowest thermal conductivity of the existing fiber materials. It is a melt blown thermal insulation made of PP fiber after special treatment [such as adding 35% of high special (coarse) PET three-dimensional crimped fiber] The wadding has a thermal performance 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 properties such as insoluble in oil and acid and alkali resistance. Characteristics, it is a 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 0.07-1 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.


6. Wipe and industrial materials


Meltblown cloth is also an excellent wiping material, which can be used for cleaning and wiping precision instruments and equipment, and can also be used as a wiping cloth for household life. In order to prevent the fiber from falling off during use and affect the use, low temperature hot rolling process is often used to increase the surface strength of the melt blown cloth.


Melt blown cloth is an excellent sound insulation and cushioning material, which is widely used in the fields of construction and automobile manufacturing.