Process Set-Up and Design of Degassing Zones

3 Kneading block zone for re-heating of the melt after flash 

Vacuum zone 1 Vacuum zone 2 vacuum zone 3 approx. 20 % LM approx. 5 % LM Residual devolatization approx. 200 mbar approx. 50 mbar approx. 10 mbar 

Compared to conventional processing tasks, the extruder drive motor is usually quite small for degassing processes, because the intake of polymer solutions or polymer melts does not require a high torque consumption. The use of a back vent depends on the amount of 

Polymer melts that do not Stick to the screw (polyolefins) 

Polymer melts which tend to stick to screws (PA, PET) 

---