ALTERNATIVE EXTRUDERS | MACHINERY
usual approach is to apply the required shear stresses to achieve good dispersion. When it comes to high-tech fillers, the challenge is that these fillers have very hard surfaces. High shear rates in the presence of hard fillers typically result in significant wear of machine process parts,” he explains. “This is where the Continuous
Kneader offers significant benefits. The Kneader technology is based on the special interaction of pins installed inside the barrel and the screw flight, with the screw rotating and oscillating at the same time. As a result of this special movement, the screw flights and pins intermesh and clean each other, which results in a narrow residence time distribution. At the same time, the material is pushed through the gap between the pin and the screw flights,” says Kretschmer. “The compounding process operates at quite
low screw speeds. Combined with a large shear gap in comparison with other compounding systems, this results in moderate shear stresses applied to the materials. Excellent dispersion is
IMAGE: GNEUSS
achieved by the large amount of movement of material through the gaps. These compounding conditions are also ideal for reducing wear in the processing section,” he says.
Gentle processing Kretschmer says the gentle nature of processing means many applications do not require special steels for the process parts. However, for the most demanding processing it has a number of high durability processing section options, including special alloys and tungsten carbide coatings. “Continuous Kneaders are highly successful in these applications, as the technology delivers a combination of good compound properties with
Above: An MRS Extruder from Gneuss with the company’s RSFgenius filtration system
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