Filtration face off: Melt-blown fibres versus electrospun nanofibres
New research into the effectiveness of melt-blown fibres and electrospun nanofibres has found nanofibre filter media provides significantly increased protection against bacteria and viruses such as Covid-19. The research, conducted by Dr Fabrice Karabulut from Revolution Fibres in New Zealand, contrasts and compares nanofibre filtration with traditional melt blown filters in light of increased global demand for PPE and the future need for more effective face masks. Dr Karabulut says melt blowing, a commercially successful and low-cost process for producing filtration microfibres, produces fibres with diameters in the range of 1-10 micrometres. “The structure of a melt-blown filter is like a non-uniform fishing net. Its pores are 1-3 micrometres in diameter which are much larger than bacteria and viruses which are just 0.1 micrometres.” He says the diameters of nanofibre range from 10 – 300 nanometres, which is 10 – 100 times smaller than conventional melt-blown microfibres, meaning they are very effective in protecting against viruses such as COVID, bacteria and other toxic particles. “Electrospun nanofibre is characterised by a very large surface area and small pore diameter which significantly increases the probability of particles in the smaller, submicron and nanometre range depositing on the fibre surface – thereby improving filter efficiency.” Increased breathability and reusable Dr Karabulut’s research is contained in the White Paper Melt-Blown Fibres vs. Electrospun Nanofibres as Filtration Media which outlines the differences between nanofibre filtration capability and melt-blown filtration. As well as increased filtration performance, he also found the breathability and reusable nature of nanofibre made it superior to melt-blown filtration. “The current pandemic has amplified the need for masks to be reusable but retain effectiveness,” he says. “A recent study testing the reusability of melt-blown and nanofibre filters when cleaned with ethanol showed melt-blown filters were only effective for single use due to the […]