Novel Coronavirus period means life. The manufacturing speed of N95 respirator is related to the speed of saving life! And now the focus is the focus of the N95 mask - "Spinneret mold cleaning."

Recently, we have received a lot of inquiries from the manufacturers of molten spray die about the recurring blockage of spinneret microholes. A situation like this affects the rate of production of molten spray. They are saving the world, save the life of the hero, how can let them be like this small matter stumped, everyone listen to xuan taste is how to elaborate.

Melt spray cloth is a layer of material inside N95 mask with core filtering effect. It is fluffy, porous, can withstand current, and has excellent adsorption and filtration strength, resulting in the final output of melt spray cloth towards the output of N95 mask. So, how exactly is molten spray, known as the N95 mask core, processed?

Molten spray is made of a molten polymer (such as polypropylene). The high speed hot air flow is used to draft the thin flow of polymer melt extruded from spinneret microorifice, so that the ultrafine fiber is formed and closed on the setting screen or roller, in addition, it is bonded by itself and becomes melt-jet nonwovens. It is ejected at high pressure from a spinneret mold with many small orifices.

The typical nozzle diameter of a spinneret die is 0.2mm, or micron. Note that this is not the diameter of the final nozzle. The temperature of the spinneret mold is maintained at around 300 degrees Celsius during operation. Near the nozzle, a fast, hot jet of air "blows" molten polymer out. The airflow stretches the polymer, and the extended polymer meets the cold air and condenses to form the fiber. Finally, the polymer is disorderly but evenly attached to the roller or conveyor belt under the effect of gas convection. The thin fiber has an aperture on the micron scale and is only 1/30th the size of a human hair. When attached to the roll, the fibers are not only laminated, but also entangled with each other. They have sufficient cohesion to form a stable structure and certain strength.

After that, the rolling fibers pass through the process of wheel pressure, additional electrostatic poles, and so on, and become the final melting spray product.