Basically fiber diameter and solidity are the main factors the on the air filtration performance of nanofibers. It can be said that the filtration efficiency improves when the fiber diameter was smaller. In addition to this, the quality factor is related to the fiber diameter for unit basis weight. Quality factor decreased (ln%Penetration/PD) when the average fiber diameter increases. Our nanofiber production lines are capable to produce nanofibers from various polymers such as thermoplastic polyurethane (TPU), polyamide (PA), polyacylonitrile (PAN) and etc.
As indicated in the filtration graphs, filtration performance increases abruptily even after nanofiber loading of 1g/m2. It was also observed that the filtration efficiency of optimized sample approximates to HEPA level efficiency at an expense of 98Pa pressure drop. Nanocentrino and Aerospinners with higher fiber production efficiency (up to x100 that of electrospinning) is your new alternative for the production of high performance air filters.
Electret Filter Technologies
There are two main approaches to improve filter efficiency. One approach is the use of finer fibers, thus increasing the efficiencies of capture mechanisms such as diffusion and interception. However, this will also result in high pressure drop, which is unfavorable for filtration. A second approach is imparting electrostatic charge on filtration medium without changing web structure. Those are called as “electret filters” or “electrostatic filters” . A conventional filter such as a glass fiber filter media may have high collection efficiency (>99%). However, the resistance would be high up to 30-40 mmH2O. Significant portion of filtration efficiency of electret filter media can be attributed to electrostatic capture mechanism, whereas contribution of mechanical capture mechanism can be as low as 30-50% of total filtration efficiency.