Mixer, New Pelletizer Facilitate Rigid PVC Compounding
Farrel Continuous Mixer and newly designed Dry Face Pelletizer combine to eliminate traditional finishing steps to make rigid PVC processing more efficient.
Farrel Pomini (FP) has introduced what is says is a cost-effective and safe method for processing virgin or recycled rigid PVC that eliminates traditional finishing requirements with its newly designed Dry Face Pelletizer (DFP).
The process begins by compounding the rigid PVC with the Farrel Continuous Mixer (FCM) to a hot-feed single-screw extruder (a Compact Processor). The PVC cools as it passes through the extruder and moves on to the proprietary DFP that minimizes die pressure and potential temperature increases while efficiently cutting pellets. After pelletizing, an air transfer system completes the cooling process along with pellet classifying and dust and fine particle removal.

This cost-effective concept eliminates the need for finishing the rigid PVC with a two-roll mill, water bath and dicer — allowing a smaller capital investment and equipment footprint as well as expedited return on investment and enhanced safety. The compact DFP is easy to operate and can be fully integrated into the user-friendly F P S Control System. The entire line can be completely automated with minimal operator involvement.

Illustration of new Farrel Pomini system for compounding R-PVC with the die face pelletizer in the open position. Source: Farrel Pomini
Meanwhile, the standard 6 L/D rotor of the energy efficient FCM provides a short residence time and low heat history, especially important for processing temperature-sensitive PVC. F P says continuous mixing technology also features adjustable mixing intensity achieved by changing rotor speed and orifice position; and excellent temperature control throughout the mixing chamber, rotors and extruder barrel.
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