GRANULATORS | SIZE REDUCTION
Right: CMG has developed its new Evoluzi- one series of “supergranula- tors” for PCR recycling
distinctive and unique features of the Evoluzione supergranulators,” he said. New from CMG for injection moulders, the G17 and G25 series are beside-the-press granulators designed for production scrap coming from technical and precision mouldings. Santella said: “Along with producing regrind having the same dimensions of the virgin granule, the precision of cut is so high that the regrind is free of powder. Also, precision injection moulding is generally carried out with small to medium all electric injection moulding machines, that are by nature very quiet. The new G17 was designed not to produce noise. The very unique, adequately shaped shell of the lower part of the granulator breaks the sound waves and conveys them to the absorption panels. The result is a unit which operates extremely quietly.” For thermoforming scrap, CMG showed the new XT35-120 granulator. The machine’s cutting chamber has been designed specifically for sheet regrinding, and special steel blades are used for extended performance over time. CMG says XT35-120 has a precision roller unit, double motor and automatic pressure control. The “other star” of CMG’s K2019 exhibit, said
Santella, was its new VP regrind evacuation system which avoids the creation of dust by using different technology to a conventional evacuation system’s through-blowers. He explained: “These are fans that are capable of pulling the regrind off the granulator and push the same to the receiving cyclone. The latter is positioned on top of the regrind holding bin or storage container. The new VP systems operate in a much more efficient way, pulling the regrind all the way to the cyclone receiver, allowing no dust generation by friction into the blower impeller or against the conveying pipe walls, and no powder pollution at the point of
Right: New MDSi digital Smart Control version of Hellweg’s established MDS 150 granulator
discharge into the holding bin or storage container, as the cyclone receiver is kept under negative pressure all the time.” Hellweg presented new Industry 4.0 controls for its machinery at K2019. It showed its MDSi 150 granulator with the company’s new digital Smart Control system which enables networked commu- nication with upstream and downstream compo- nents, as well as with operators, in line with Industry 4.0 standards. The new system measures and stores power consumption as well as, for example, rotational speed and bearing temperatures and monitors the service life of bearings, blades, screens and the drive V-belts. This new Smart Control system is available for all Hellweg granula- tors from the 150 series upwards. The company said that monitoring mechanical mill components enables predictive maintenance to avoid unplanned production downtime, while possible faults and damage can be detected at an early stage. A visual alarm informs the operator of the need to replace a part due to wear. An active V-belt monitoring system automatically switches off the granulator in the event of a deviation from the nominal value. Hellweg’s new “boost operation” option enables a
short-term increase in grinding performance, in order to compensate for production-related fluctua- tions. In addition, certain rotational speed ranges have been defined for various plastics, due to which, for example, low melt-temperature granulation can be performed continuously without problems arising, so that water-cooling is not required.
34 PLASTICS RECYCLING WORLD | November/December 2019
www.plasticsrecyclingworld.com
PHOTO: HELLWEG
PHOTO: CMG
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