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Performance of melt blown cloth

  • Release on:2021-06-09
Melt-blown non-woven fabrics are mainly used to filter micron particles such as dust, microorganisms, and smog, which can be called the "heart" of masks. It is made up of polypropylene microfibers randomly distributed and bonded together, and the appearance is white, smooth and soft. The material fiber fineness is 0.5-1.0 microns. The random distribution of fibers provides more opportunities for thermal bonding between fibers, thus making melt blown The gas filter material has a larger specific surface area and a higher porosity (≥75%). After high-voltage electret electrostatic treatment, it has the characteristics of low resistance, high efficiency and high dust capacity.

Alias: melt blown cloth(PFE 99 Meltblown Company), mask cloth, PP non-woven cloth

English: Melt blowing

Raw material: plastic polypropylene (PP) special meltblown material

PFE 99 Meltblown Company, PP Meltblown Filter Wholesale, Mask Filter FactoryPFE 99 Meltblown Company, PP Meltblown Filter Wholesale, Mask Filter Factory

Meltblown non-woven fabric(Mask Filter Factory) is a non-woven fabric with static electricity. Melt blowing is a conventional manufacturing method for micron and nanofibers. The polypropylene polymer solution is extruded by a high-speed small nozzle to extrude ultra-fine polypropylene short fibers with a diameter of 0.5-1.0 microns, and they are randomly interwoven and intertwined.

The unique capillary structure of meltblown non-woven fabrics increases the number and surface area of ​​fibers per unit area, and the gaps are extremely fine. Through the high-voltage electret electrostatic treatment, the fiber negatively has the electrostatic adsorption capacity, which has good air filtration.

The filtering effect of meltblown non-woven fabric(PP Meltblown Filter Wholesale) is a "smile curve", and the non-oily particles with a diameter of less than 0.1 micron nanometer level can be adsorbed by static electricity. Particles larger than 10 microns in diameter can be absorbed by the physical structure of the fabric. Even the worst gauze mask can achieve a protection rate of close to 80%.

The most difficult thing to filter is the particles with a diameter in the range of 0.3 microns. Therefore, my country's testing standards for masks use 0.3 micron sodium chloride particles as the testing indicators. Meltblown non-woven fabrics with a thickness of less than 0.1 mm can filter 0.3 micron sodium chloride particles by more than 70%.

Viruses exist as droplet nuclei in the form of droplets and aerosols, of which 82% of the droplet nuclei have a diameter in the range of 0.74-2.12 microns. Therefore, melt-blown non-woven fabrics have become core materials such as masks and HEPA filter papers, which can effectively prevent viruses and play an irreplaceable role in the medical and health fields.

Medical masks generally use SMS (spunbond-meltblown-spunbond) composite multi-layer structure. The S inside and outside is spunbond non-woven fabric, English is Spunbond; the middle M is melt-blown non-woven fabric, English is Melt blowing.

The outer layer of medical surgical masks and medical N95 masks need to use waterproof non-woven fabrics, which are mainly used to isolate the patient’s droplets and blood; in the middle of the medical N95 masks is a thicker meltblown non-woven fabric, which has a very Good filterability, the inner layer is ordinary non-woven fabric.

The filter layer of industrial dust masks is mostly melt-blown non-woven fabric or HEPA filter paper made of melt-blown non-woven fabric.

The filter cotton and electrostatic cotton of the gas mask also use meltblown non-woven fabric, and the high-end dust filter box uses HEPA filter.

The weight range of meltblown non-woven fabric is generally 15-500 g/m2, and the meltblown non-woven fabric used in masks is light and thin. For comparison, the T-shirt we wear in summer weighs about 150 grams. For masks with different filtration levels, the thickness of the meltblown non-woven fabric is very important.

20~25 grams weight: BFE≥95, medical surgical mask standard is BFE≥95% (anti-bacteria), PFE≥30% (anti-virus)

40~45 grams weight: national standard KN90 mask

50~55 grams weight: national standard KN95, American standard N95 mask

75~90 grams weight: national standard KN100, American standard N99 masks

Disinfection of meltblown non-woven fabrics will not significantly change the fiber morphology, and alcohol spray will not necessarily greatly reduce the filtering capacity of the mask. but! This does not mean that you can safely wear a sterilized mask. The Chinese Center for Disease Control and Prevention issued the "Technical Guidelines for Mask Selection and Use", which proposed that masks should be saved when they are in the province, and do not save when they should not. It should be flexibly selected according to usage scenarios and protection requirements.