How is meltblown polypropylene made?

The resin is fed into an extruder where it is heated and melted to the appropriate temperature and viscosity required for fiber formation.

The extruder feeds molten polymer through a distribution die which enforces the polymer through fine holes in a spinnerette which is attached to the discharge end of the distribution die.

As the resin strands emerge from the spinnerette, high velocity hot air is discharged along both sides of the spinnerette.

This stream of hot air attenuates the polymer strands into a blast of microfibers which are frozen by the surrounding ambient atmosphere before being propelled onto the web former.

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