EuroWire November 2015

48 / 92

Feature
Compounds, coverings & extrudingmachinery
November 2015 46
Response to increasing
demand
With the development of the ROEX Extruder, Rosendahl has responded to the
increasing demand for energy savings and higher final product quality.
The ROEX was developed in 2006, immediately offering significant advantages over
classical extruder technologies on the market. Many customers are successfully
running more than 1,000 ROEX Extruders in the field. This confirms that this important
development was the right step to take to bring more added value to the cable
manufacturer.
Advantages of the ROEX Extruder include energy savings and reduced power
consumption; higher and counter-pressure independent output; and higher linearity
over the whole operating range. Low power consumption is becoming increasingly
important all over the world. Many old extruders are refurbished even though their
energy costs remain high. The main energy demand is from the extruder drive.
The CMG (compact motor gearbox) is the latest extruder drive technology. Within the
housing of the CMG, there are four motors symmetrically placed around one planetary
gear. This positioning enables very uniform load transmission.
ROEX Extruders are equipped with a specially designed water-cooled feeding section.
Together with the appropriate screw, this design imparts a conveying extruder
characteristic. Compared to conventional extruders, the influence of counter-pressure
fluctuations is reduced to a minimum. The result is a consistently high quality final
product and a significantly higher output.
In addition to its higher output and insignificant melt pressure fluctuations, ROEX
extruders have the significant advantage of high linearity of output over the entire
range of operation.
Further features include:
• Independent water-cooling system for feeding section and CMG
Both the extruder CMG and the feeding section are water-cooled. This system
avoids contamination in these water channels. The chilled plant water is connected
to the plate heat exchanger. There is no contact between the plant water and the
coolant in the separate cooling system
• Simple integration in existing extrusion lines for upgrade
ROEX Extruders are equipped with a PLC with two integration methods: with total
integration in existing line control via fieldbus (Profibus, Profinet, etc) and with
integration as a stand-alone version with touch panel and hardware interface
RosendahlNextrom GmbH – Austria Website:
▲ ▲ Power cable ROEX Extruder group with RX crosshead