Melt Blown

Meltblown cloth, commonly known as the “heart” of the masks. It is the filter layer in the middle of the mask, which can filter bacteria and prevent the spread of germs. Melt-blown cloth is a film made of polypropylene with a high melt index. It is a film formed by laminating many criss-cross fibers in random directions. The fiber diameter ranges from 0.5 to 10 microns, and the fiber diameter is about 30 cents of the hair thread.
The melt blown process is a nonwoven manufacturing system. It is  involving direct conversion of a polymer into continuous filaments, integrated with the conversion of the filaments into a random laid nonwoven fabric.
The melt blown process  is a one-step process that converts polymer resin into low diameter fiber nonwoven web or tow (Andreas Desch, February 2011). The melt blown process, and its variants, is the only large-scale commercial process. It is presently being used to directly produce melt spun fibers with diameters in the submicron range without splitting or chemically dissolving away polymer.
Melt Blown Made in Germany
There couple of manufacture that produce melt blown in Germany. However, their orders are queued unitl September!