What is the development of meltblown nanofibers in meltblown nonwoven technology

　　The development of meltblown nanofiber:

　　In the past, the development of meltblown fibers was based on Exxon's patented technology, but in recent years, many companies in the world have broken through Exxon technology and developed into finer nano-level fibers.

　　Hills company has done in-depth research on nano melt blown fiber, and it is said that it has reached the stage of industrialization. Some other companies, such as Nonwoven Technologies (NTI), have also developed processes and technologies for producing nano-melt-blown fibers, and have obtained patents.

　　In order to spin nanofibers, the spinneret holes are much finer than those on ordinary melt-blown equipment. NTI can be as small as 0.0635 mm (63.5 microns) or 0.0025 inch. The modular structure of the spinneret can be combined Into a total width of 3 meters or more. The diameter of the meltblown fiber spun out is about 500 nanometers. The thinnest single fiber can reach 200 nanometers in diameter.

　　Because of the small nozzle holes of the melt-blown equipment for spinning nanofibers, if no measures are taken, the output will inevitably be greatly reduced. Therefore, NTI has adopted an increase in the number of nozzle holes, and each spinneret has 3 rows or more rows of spinnerets hole. Combining many unit components (depending on the width) together can greatly increase the output during spinning. The actual situation is that when 63.5 micron perforations are used, the number of perforations per meter of spinneret in a single row is 2880. If three rows are used, the number of perforations per meter of spinneret can reach 8640, so that its output can be compared with spinning. The production of ordinary melt blown fiber is equivalent.

　　Because thin spinnerets with high-density holes are expensive and easy to crack (crack under high pressure), various companies have developed new bonding technologies to enhance the fastness of the spinnerets and prevent them from being damaged. Leakage under high pressure.

　　Meltblown nanofiber can improve filtration efficiency:

　　Nano melt blown fibers can be used as filter media, which can significantly improve filtration efficiency. There are also data showing that because the fibers in the nano-grade meltblown nonwovens are thinner, lighter weight meltblown fabrics and spunbond composites can be used, and they can still withstand the pressure of the same water head, and the SMS products made from it can reduce the proportion of melt blown fiber.