Submitted by Leonard Horst on Tue, 03/23/2010 - 2:54pm.
Susan,
Since the primary PVC particle begins to flow at about 160-170 degrees C, I'd suggest an increasing profile from about 150 C at the feed throat or rear of the extruder, then moving up to about 190 at the adapter/die. You will want to observe the melt at the vent if you are using a two-stage screw, and you'll need to adjust your profile up or down depending on the "state of usion" at the vent.
If you are fused at the vent, your melt quality may suffer.
All these setting depend on the extruder, screw design, barrel heater zone configuration, and the compound formulatiion. So, exact set point arre difficult to predict.
Comments
PVC Extrusion Temps
Susan,
Since the primary PVC particle begins to flow at about 160-170 degrees C, I'd suggest an increasing profile from about 150 C at the feed throat or rear of the extruder, then moving up to about 190 at the adapter/die. You will want to observe the melt at the vent if you are using a two-stage screw, and you'll need to adjust your profile up or down depending on the "state of usion" at the vent.
If you are fused at the vent, your melt quality may suffer.
All these setting depend on the extruder, screw design, barrel heater zone configuration, and the compound formulatiion. So, exact set point arre difficult to predict.
Len