What is the Zetta-Spinning Method?
The Zetta-Spinning method is the only nanofiber production method in the world that enables both high volume and safety. In addition, the Zetta-Spinning method is capable of swelling both melt and solvent-diluted polymer. This feature distinguishes it from ESD (Electro Spray Deposition) method that is generally used for conventional nanofiber productions.
And unlike the ESD method, it ensures safe production by avoiding high voltage and using only high-speed and high-temperature air instead. Furthermore, by utilizing the melting process the ESD method is incapable of, it can produce safe masks without using toxic organic solvents.
When using a solvent, Zetta chooses only polymers that use water as the solvent (PVA, PEG, hyaluronic acid, etc.). Nanofiber masks using the ESD method are sold in markets, but please be aware of residual DMF and DMAC, which may cause liver damage. In South Korea, 400,000 masks with residual solvent were distributed to elementary schools which became a serious problem.
Since the Zetta-Spinning Melt Type Method can mass-produce nanofiber with a diameter of φ400 nm, it creates a safe antibacterial effect by enabling van der Waals force (intermolecular force), which couldn’t be utilized before.
3D Structure (Melting Method)
The Zetta-Spinning Melt Type Method can produce an overwhelming volume of nanofiber. In addition, because it stretches fibers with high-speed and high-temperature air, it creates the mixture of nanofibers with significantly different diameters, resulting in a large space in between. This creates a sheet with a three-dimensional structure. (See Fig. 1)
The cotton-like three dimensional structure allows air to flow vertically as well as horizontally so pressure loss is kept low. (It makes it easier to breathe through the fiber.) (See Fig. 2)
Safer Production Technology than Conventional Method (Melt Type Method)
The Zetta-Spinning Melt Type Method uses PP (polypropylene) with a very high MFR (Melt Flow Ratio).
This allows to melt the polymer with heat alone to create a swollen state so that nanofiber is spun without using any harmful organic solvent.
Also, as a mysterious phenomenon of nanofibers, the flammable substance PP becomes flame-retardant in nanofiber form and does not burn even when exposed to the heat of 1300 ° C of a burner.
As a result, the explosion, the biggest problem with the ESD method, is no longer a risk factor for the new method.
Significantly Reduced Production Costs.
Zetta Spinning spray nozzle is 1000+ times more productive than Melt Blown dies and has achieved 200 nm diameters of nanofiber or less.
This result allows the equipment to be smaller and mass-produced.
As a bonus, the running cost is reduced to about 1/5 compared to Melt Blown.
Exhaust treatment is not necessary when the equipment uses the safe PP.
Can be produced with inexpensive raw materials (Melt Type Method)
Typical polymers that can be produced with the Zetta-Spinning Melt Type Method are PP (polypropylene) and PET (polyester).
These materials are safe and inexpensive materials. As a feature;
- PP (polypropylene)
It floats on water with a specific gravity of 0.9 (g / cm3), and its nanofiber develops super water repellency.
PP nanofiber cotton absorbs oil more than 50 times its own weight.
Therefore, it is very effective in recovering oil spills in marine accidents.
- PET (polyester)
It has a specific gravity of 1.34 (g / cm3) and sinks in water.
It has a hydrophilic characteristic compared to PP.
PET nanofiber also absorbs oil, but its absorption is about 20 times its own weight.
It can be applied mainly to the clothing industry.