It is noted that masks that maintain blocking performance even after 20 or more times of washing can be developed to solve the mask shortage caused by the spread of new corona virus infection (corona19).
Korea Advanced Institute of Science and Technology (KAIST) announced that the research team of Professor Kim Il-doo of the Department of Materials Science and Engineering has developed a nanofiber filter that maintains filter efficiency even after washing with the ‘isolated block electrospinning method’ that crosses or aligns nanofibers at right angles.
The existing melt blown filter is a non-woven fabric in which fibers are randomly entangled, and the pore size is very different, so multiple filters must be overlapped to block even small particles.
In addition, when the static electricity formed on the fiber surface disappears when it comes into contact with moisture, the filter efficiency drops sharply after a certain period of time has passed after washing or washing.
The filter made by the research team is made by crossing fine nanofibers at right angles or closely aligning them in a line. The pore size is small and the same.
Thanks to this, the same blocking efficiency can be achieved with a thinner thickness than a conventional filter.
The breathability is good, so it is easy to breathe, and the particle blocking performance is maintained even after washing with ethanol or soap several times.
Although the research team hand-washed the filter more than 20 times with soap and immersed it in ethanol for more than 3 hours, the filter structure remained unchanged and maintained 94% of the initial performance.
Even if it was repeatedly bent over 4000 times, it had a blocking effect of KF80 or higher.