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ENERGY MANAGEMENT | PROCESSING


Fianke, Global Marketing Manager for Dynavis. Injection moulding machines not only use less drive energy, the fluids with Dynavis also don’t get as hot and can withstand shear forces more effectively, he says. “Thanks to fluids formulated with Dynavis technology, it is not only possible to increase machine efficiency, it is also possible to actively conserve resources and lower CO2


emissions.” One


simple step that can be taken is to change the hydraulic fluid from a standard ISO 46 viscosity grade to an ISO 32 formulated with Dynavis. Evonik has tested fluids formulated with Dynavis technology on machines from various suppliers. Fluids reached the optimal temperature range faster and maintained it more precisely, it says. This resulted in energy savings of 7 to 10%, correspond- ing to cost savings of about €400 per year, for a Boy 35E machine, for example; and energy savings of 6.2% of the drive energy (about €1,200 per year) for an Engel Victory 330/120 machine.


Mould temperature Improved control over mould temperatures is another obvious way of cutting energy bills while maintaining – and often improving – part quality. GWK Gesellschaft Wärme Kältetechnik, a leader in the field, says that following its takeover of the assets of Hahn Enersave last July, it is now offering the Protemp series, a highly efficient series of compact temperature control units which, accord- ing to the manufacturer, deliver the highest level of energy efficiency currently available on the market. This is achieved by the use of centrifugal pumps in combination with frequency-controlled drives. In comparison to the standard impeller-type periph-


Comparison of cycle power of two different hydraulic oils Source: Chevron


Evonik says Dynavis technology provides substantial energy savings in a wide range of injection moulding machines


Comparison of the energy consumption of a peripheral pump (1.15 kW) and a centrifugal pump (0.61 kW) with the same operating points


Source: GWK www.injectionworld.com May 2019 | INJECTION WORLD 37


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