The COVID-19 has led to a surge in demand for melt blown dies. The melt blown die uses a high-speed hot air flow to rapidly stretch and solidify the polymer melt that has just been extruded. For the manufacture of melt blown dies, processing spinneret micropores is a key difficulty. Most of the melt blown dies use rectangular spinnerets, and the materials are generally SUS316L, SUS304, SUS630, SUS431 and other stainless steels. The accuracy of the melt blown die is very high, and the processing is very difficult.