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Eco-Molding: More Power for Less Energy

from Plastics Engineering

For years injection molding machine makers have touted savings of 30 percent, 50 percent, and even more in energy cost. But OEMs typically calculate energy savings by comparing new efficient machine functions to old-fashioned hydraulics in which standard induction electric motors run at constant RPM. These power one or more hydraulic pumps, running constantly, even when the machine is idling. The big energy savings come from reducing that unnecessary motion by adding servo motors to hydraulic pumps and variable frequency drives to electric motors, so they only turn when needed. more

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