Meltblown materials are out of stock all over the world and all factories are full, but there is a high-end filter material that replaces meltblown materials. That’s PTFE (polytetrafluoroethylene)!
Wearing a mask is an important and effective way to isolate the virus and protect vulnerable groups. Currently, masks can be used to isolate bacteria and PM2.5 particles in two ways:
(1) Electrostatic adsorption, which is an active isolation method, uses the electrostatic force between the fibers in the middle layer of the mask to adsorb bacteria and tiny particles to achieve isolation and protection;
(2) Physical isolation is a passive isolation method, which uses the small pore structure of the mask itself to block the invasion of bacteria and viruses. The physical isolation method mainly uses the gravity effect, interception effect, diffusion effect, and inertia effect of bacteria and fine particles.
The design requirements of general medical surgical masks can block bacterial aerosol particles larger than 3 microns in diameter, but due to the large pore diameter of the core layer of the mask, the physical isolation of small particles of bacteria and viruses cannot be perfectly achieved. Such masks mainly use electrostatic adsorption Methods. However, as the wearing time increases (such as 1 to 2 hours), the mask becomes wet due to human activities such as breathing of the wearer, and its electrostatic adsorption capacity is weakened, and the isolation effect gradually becomes worse. Therefore, ordinary medical surgical masks cannot achieve long-term effective isolation and protection.
The surge in global demand for masks has become a global topic. The melt-blown fabrics known as the mask “heart” originally started at less than $3,000 per ton, and now the price has risen more than $40,000!
In this context, the replacement of mask meltblown fabrics has also become a hot topic in recent times! Meltblown materials are out of stock all over the world and all factories are full, but there is a high-end filter material that replaces meltblown materials. That’s PTFE (polytetrafluoroethylene)!
What deserves high attention is that PTFE nano masks produced with PTFE (polytetrafluoroethylene) as the main raw material have become a new direction for the development of masks in the future!
Nano masks have become an efficient medical protective mask due to its highly efficient filtering performance. Similar to ordinary medical masks, nano antibacterial masks also consist of outer layer, middle layer, inner layer, ear hook, nose clip and other parts. Nano masks are special in that the middle layer is made of nano-membrane with a smaller pore size (100-200 nanometers), which is generally made of PTFE. The PTFE film produced by unidirectional or biaxial stretching method has a spider web-like microporous structure on the surface, and has three-dimensional structure with very complicated changes such as network connection, hole setting, and channel bending, so it has excellent surface filtration Features.
Nano masks made from PTFE material have the characteristics of high barrier efficiency, long wearing life, light and breathable, and it is a new trend for the development of masks in the future. However, at present, such PTFE masks are relatively expensive and cannot completely replace traditional masks.
Post time: Apr-08-2020