I received a request for a polypropylene the other day. The customer was looking for a grade that could be used for making “melt blown” fabric. I was not familiar with this process. You can see it in action in the above video. The polypropylene grades that are used for this have melt flows in the 1200-1500 g/10 minutes range (yes, you read that right).
The process uses an ordinary extrusion line but a high pressure gas is injected into the die which aerosol-izes the melted material and sprays it onto a roller.
I have been in this business for a while but this process was new to me.