Processing of PET material with initial moistures of up to 13,000 ppm (PET bottle flakes) or 6,000 ppm (PET sheet flakes) for processing on single-screw extruders or twin-screw extruders with vacuum degassing.
Achieve moisture content of 150 ppm.
Prevent sticking and clumping of the material in the extruder intake and limiting the hydrolytic degradation of the IV value.
Recycled material (virgin or blend) is recrystallized in a continuous IRD in under 15 minutes, then uniformly heated to 175 °C and dried to about 300 ppm. Subsequently, the material is transferred to an insulated and vented buffer container with filling level control for further moisture reduction to 150 ppm (about 90 minutes).
Crystallization and drying in one process step
Approximately 60 % dwell time reduction
About 40 % energy saving
No separation of blends of recycled material and virgin material
Capacities from 100 kg/h to 2.5 t/h economically feasible