The world leader for proven processing solutions. Gear ... - Suurmond

1 Compounding
polyrex ® goes gentle on melts. Extruders without gear
pumps require a certain length to generate the required pressure. This length
depends on the rheological properties of the polymer melts and the extruder
itself. However, the process invariably involves inefficiencies as some of the
extruder’s mechanical energy is converted into non-useful heat. In the case of
temperature-sensitive polymers, the permitted melt temperature cannot be ex-
ceeded without the melt being permanently damaged.
On compounding lines with a polyrex ® gear pump downstream, virtually all
the pressure built up by the extruder or kneader is no longer needed since the
more efficient pump has taken over the responsibility for pumping. This in turn
can lower the melt temperatures in the extruder by as much as 30 °C, and yields
an overall energy saving of as much as 25% for the extruder and pump together
versus a line running with an extruder alone.
A pressure regulator keeps the suction-side melt pressure of the polyrex ®
gear pump constant by tracking the speed of the pump. What’s more, certain
parameters such as bearing temperatures are continuously monitored. This
guarantees an optimum running process at all times.
Properties of polyrex ®
• Gentle pumping of polymer melts
• Preparation of different polymers melts with large Melt Flow
Index ranges
• Throughputs up to 100 tons per hour
• Higher system throughput rates than without gear pumps
• Constant throughputs independent of pressure
• Lower energy requirements, with total annual energy savings
as high as 25%
• Long service life and durability
• Reduced wear on the extruder barrels and screws
• Shaft and bearing cooling possible, including retrofits,
for increased output rates