Injection moulding machines The right drive technology
Injection moulding machine drive technology has changed dramatically over the past couple of decades. In energy terms, the most significant change is the arrival of all- electric and hybrid machines. However, even traditional hydraulic machine drive design has evolved with an extensive choice of motor and drive options.
Hydraulic machines have traditionally used a fixed speed motor continually running a fixed volume pump but this arrangement has largely been superseded by new designs that aim to adapt oil volumes to demand. Fixed speed motor/variable volume pump machines use an adjustable swash plate on the pump to adjust the delivery of high- pressure oil. Variable speed motor/variable volume pump machines use a variable speed drive (VSD) to add further flexibility. Servo motor/fixed volume pump combinations take flexibility and energy saving even further.
Hybrid machines use a combination of hydraulic and servo motor drive
8 An energy saving guide for injection moulders
technologies, with a typical configuration combining hydraulic machine operation with servo motor drive on the plasticising screw. This allows a smaller hydraulic drive system to be used, reducing the base load of the machine.
All-electric machines use servo motor drive technology on all the main machine movements (but not always on minor movements such as
Know your machine drive technology Motor options
Hydraulic
Fixed speed motor/ variable volume pump
Variable speed motor/ variable volume pump Servo motor/
fixed volume pump
All-electric Hybrid
Various combinations, e.g. electric screw drive
nozzle pressure and ejectors). By only using energy when a movement is required, base loads are dramatically reduced and overall energy savings of up to 60% are possible. Initially limited to smaller clamp capacities, motor improvements have gradually lifted the size limits while economies of scale in production have reduced the price premium.
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