How to measure the filtration performance of meltblown non-woven fabrics

Melt-blown non-woven fabric, commonly known as filter cloth, is a high-efficiency melt-blown product. It is a superfine fiber non-woven fabric made with imported meltblown die head and special raw materials and technology. The product not only has the functions of ordinary meltblown products with fluffy, soft hand feeling, oil absorption and filtration, but also increases the efficiency of bacterial filtration and reduces the respiratory resistance. It is more suitable for filtration in the work area of u200bu200bmedical and high dust operations. demand.


How to measure the filter efficiency of melt blown filter cloth?


The filter efficiency is an important indicator to measure the quality of the filter material. Therefore, in the selection of the melt blown filter cloth, the evaluation of the filter efficiency is an important indicator used in people’s lives to choose the melt blown filter cloth. , Then how to measure the filtering efficiency of melt blown filter cloth? How can we calculate a scientific numerical index? This is a professional method.


The two main factors that affect the quality of melt blown filter cloth are pressure loss and filter efficiency. Generally speaking, when the filter efficiency is guaranteed, the pressure loss reflects the lower the breathing resistance, the better the melt blown filter cloth. At present, the internationally recognized authoritative organizations include the United States NELSON (Nielsen Laboratory) and NIOSH (National Institute of Occupational Safety and Health); NELSON has tested and issued a BFE filter efficiency report for medical masks; NELSON mainly For testing mask materials, etc., regular N95 masks have a NIOSH certification number on them. The certification is mainly for mask manufacturers. The testing process will involve company management, environment, equipment, various certifications, supply chain and other aspects.


NELSON Standard Melt Blown Cloth


NELSON standard series of meltblown raw materials are made of 100% PP polypropylene, and there are four grades of BFE95, BFE99, PFE99, and VFE95. The so-called BFE means that the filtering effect of 3 micron solid particles reaches 95% (BFE95) and 99% (BFE99) when tested at a flow rate of 32 liters. PFE99 means that the filtering effect of 0.1 micron solid particles reaches 99% (PFE99) when tested at a flow rate of 32 liters. VFE95 means that the filtering effect of 3 micron solid particles reaches 95% (VFE95) when tested at a flow rate of 32 liters. The whole roll produced by the machine has a width of 320cm, and the width can be cut for free. The gram weight is 18-30g/m2. Production process melt spinning method. Application: disposable non-woven masks, folding insert masks.


N95/N99 standard melt blown cloth


N95/N99 is the American standard. The raw material is 100% PP polypropylene. The so-called N95 means that the filtration effect of 0.3 micron solid particles can reach 95% (N95) and 99% (N99) when tested at a flow rate of 85 liters and within 100 resistance. ). The machine produces a whole roll with a width of 160cm, which can be cut free of charge according to actual needs. The conventional grammage of N95 is 50 (g/m2) for double layer, and the grammage of N99 is 80 (g/m2) for double layer. Production process melt spinning method. Application: American standard cup-shaped, foldable mask.