MACHINERY | RECYCLING AND GRANULATORS
as well as monitoring the state of blades, screens and V belts. Recent implementation of the Ethernet-based,
Above: Hellweg’s digital Smart Control System is now
available on its entire range of granulators
of recycled plastic and wood”, which they said helped to minimise waste and conserve natural resources. Five different types of polypropylene (PP) or polyethylene (PE) based recycled plastics and wood – from urban household waste – were used to make the recycled WPCs (r-WPCs). Both virgin and recycled WPC compounds were prepared with wood flour and maleic anhydride-grafted compati- biliser (MAPP or MAPE) to evaluate the effect of recycled polymer type and compatibiliser on mechanical properties. The study found that the tensile strength of
Right: CMG has added the EV916 and EV616 models to its Evoluzi- one series
r-WPCs made from recycled PP was higher than those made from mixed polyolefins or recycled PE. Based on the tensile, impact, flexural, and water sorption properties of r-WPC compounds with different formulations, the researchers determined the optimum conditions of r-WPC compounds for industrial manufacturing. Surface morphology of fractured surfaces – as well as tensile, flexural and density results of r-WPC compounds – revealed that MAPP enhanced the effect on interfacial adhesion in r-WPCs. “The study shows that r-WPC compounds made
from recycled bulky plastic and wood wastes can be used as a potential raw material in plastic and the WPC industry,” said the researchers. The study was published in the journal Waste and Biomass Valorization.
Digital control Hellweg says that its whole range of granulators is now equipped with its digital Smart Control System. It showcased the machines at Fakuma in Germany last year.
Monitoring is now an option for all sizes, starting
from the 150 series machine-side granulators for small parts right up to the heavy-duty 600 series designed for the toughest applications. The control system detects parameters such as power con- sumption, motor speed and bearing temperatures,
22 PIPE & PROFILE EXTRUSION | May/June 2022
www.pipeandprofile.com
cross-system OPC UA standard means the ma- chines can now be integrated into control centre systems. As well as providing component monitor- ing and interconnection with other machines, the control system also has a ‘boost’ mode for adapt- ing grinding capacity to production-related fluctuations. Adaption of operating parameters to defined plastics means that even temperature- sensitive grades can be straightforwardly pro- cessed without water cooling. The ‘eco’ operating mode adjusts machine speed to the prevailing input volume, so reducing power consumption. “Smart control is meeting a long-felt need in the
sector,” said Mark Hellweg, managing director of Hellweg. “Our customers appreciate the ability to monitor mechanical components and schedule maintenance accordingly – so avoiding disruptive and costly production downtime.”
Size reduction CMG Granulators showcased a number of its technologies at the Greenplast exhibition in Milan, Italy in May 2022. In addition, Giorgio Santella – managing director
of CMG Granulators – presented CMG solutions that can halve the energy needed to recycle plastics. All CMG’s units for recycling, with capacities from 800 kg/h to over 5,000 kg/h, use the adaptive motor power (AMP) function. This allows the granulator to autonomously establish which power level to use
IMAGE: HELLWEG IMAGE: CMG
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