Reversed Temperature Profile 2

Modified on Sunday, 01 February 2015 10:39 PM by mpieler — Categorized as: Extrusion Hints

Reversed temperature profile 2
Vol.21 #2, Oct. 1994

Many of the latest barrier screw designs work best with either a reverse or humped profile to achieve optimum melting and pumping performance. If the temperatures on the first few zones are set too low, you will sometimes see small gels, or unmelted particles in the extrudate.

If the rate seems too low, try raising the set points on zones 2 and 3 above the set points of the other zones (to form a hump in the profile). This will often improve feeding and, therefore, the rate. If the melt temperature is too high, lower the settings on the last zone(s).

See also:
Return to Extrusion Hints