The Planetary Roller Extruder - an Universal Genius
At the beginning plastics have been compounded exclusively discontinuously. This happened for example in heating / cooling blending combinations. However, by this discontinuous compounding the material was subject to constant fluctuations in quality caused by the indifferent dwell times. Therefore, at the beginning of the Sixties, the trend to continuous compounding processing ensued, e. g. co-kneader, twin screw and planetary roller exrtruder.
More than 60 years ago, Mr. Wittrock of Messrs. Chemische Werke Hüls AG, nowadays Evonik, has invented the planetary roller extruder which found initially application in the PVC-calender industry. Since the Eighties ENTEX has consequently developed and perfected this process. By initiation of the heat transfer by means of pressurized water and an ameliorated construction of the cooling channels enabling a product-close temperature guidance and therefore having decisively influenced the heat transfer, this system has also been accepted more and more in other fields of application.
Today, the planetary roller extruder is not longer only the classic compounding aggregate for the PVC industry, but covers the whole bandwidth of the compounding and reaction technology.