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MACHINERY | SCREWS AND BARRELS


she says. “This is to reduce long and unplanned shut down times due to worn components in the extruder and avoid negative effects to the high compound quality. Lifetime estimates and predictions for our components like screw elements and barrels are becoming increasingly important in order to be able to plan produc- tion interruptions and overhaul of


Above: The enhanced WP 043+ barrel lining devel- oped by Coperion is said to offer improved damage tolerance and corrosion resistance


machines more effectively.” The company currently offers two measurement options based on either plate capacitor or laser technology (the latter offering a video option to provide crack detection as well as measurement). Neither requires dismantling of the barrel although the internal surfaces must be clean and the screws pulled. When used as part of a regular mainte- nance programme, barrel measurement data can be used to map wear progress.


Right: Involute screw elements from Coperion allow elonga- tional stress to be adjusted, improving


performance in highly-filled applications


Alternative profiles Coperion has also been exploiting the potential gains available from the use of non-conventional screw profiles. Its Involute screw and kneading elements depart from the constant radius and gap of the classic Erdmenger profile, allowing elonga- tional stress on the melt to be varied. They are said to be particularly effective in processing of highly- filled polyolefins where they can provide greater throughput rates, handle higher loadings, and achieve better dispersion and homogenization. Tests carried out in the com-


pany’s own test laboratory in Stuttgart using machines fitted with Involute elements showed an output increase from 550 kg/h to 900 kg/h when processing a 70% CaCO3


58 Mc18 Mc18


CaCO3


machine. Trials on a ZSK 92 extruder processing 80% filled PE saw output


increase from 2,200 kg/h to 3,000 kg/h. The extrusion division of


KraussMaffei is adding four new high performance ZE Blue Power compounding extruders to the range. Set for launch at K2019, the new machines represent a continuous scale-up of smaller machine sizes in the current KraussMaffei range. From a process-engineering point of view, the four large extruder variants – 98, 122, 142 and 166 mm – are identical with the


58 COMPOUNDING WORLD | August 2019


smaller sister models and offer the same screw and barrel modularity. This includes a wide range of 4D and 6D barrel sections and various side feeder and degassing units. Exchangeable oval liners provide a cost-effective alternative for extremely wear- intensive processes. A number of minor design modifications have been implemented by KraussMaffei to allow for the size of the new extruders. Housing elements are connected by means of screw unions instead of clamping flanges, for example, while cartridge heaters are replaced by ceramic heaters. Detailed information on the design and perfor-


mance of the new series will be available at the K2019 exhibition. In the meantime, Matthias Sieverding, President of the Extrusion Technology Segment at KraussMaffei, says: “The results ob- tained in first trials using a high-filled polypropylene formulation with 50% of an only 1 micron fine talc were perfectly in line with our expectations.” KraussMaffei says the extension of the ZE Blue-


Power series means it can now offer tailored extrud- ers for any type of application, allowing it to replace all its previous twin-screw extruder series. The combination of large free volume and high specific torque enables universal application of the ZE BluePower for compounding engineering plastics and even highly filled formulations. Due to the 1.65 OD


/ID diameter ratio, free volume is increased by


27% compared to the previous ZE UT extruder series. In addition, the ZE BluePower features a 36% higher torque density of 16 Nm/cm3


. C A Picard International has developed filled PP on a ZSK


tailor-made products and services for preventative maintenance for production improvement. These include a Barrel Measurement Device (BMD) for providing accurate barrel wear information and analytical reports. In addition, the company has developed the Flexible Dismantling System (FDS) with PLC control to dismantle screw elements from the shafts efficiently with full protection of the screw elements and shafts, without injury risk to workers.


CLICK ON THE LINKS FOR MORE INFORMATION: � www.nordson.com � www.centuryextrusion.com � www.feddem.com � www.coperion.com � www.kraussmaffei.com � www.capicard.de


www.compoundingworld.com


PHOTO: COPERION


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