KBA is Reducing Energy Input on High-Output PressesJuly 24, 2012
With a sheetfed offset press, the amount of energy consumed depends to a large extent on the type of job being printed. Alongside general efforts to optimize energy efficiency, from which any printer would benefit, there are some additional options for reducing the primary energy input where the financial outlay would only be worthwhile for specific print applications. Given the diversity of the production parameters involved, determining the potential benefits of recovering and reutilizing waste heat off the press in the most effective way required a series of precise measurements taken over a prolonged period of time.
Drawing on a solid foundation of captured data, KBA has developed an array of standard and optional features for enhancing the energy efficiency of Rapida presses from the feeder to the delivery.
Efficiency-enhancing four-quadrant drives
Rapidas are fitted with four-quadrant drives which enhance overall press efficiency by feeding braking energy back into the grid. This has proven particularly effective at reducing power consumption during makeready processes. KBA favors direct belt drive onto the first impression cylinder.
Shaftless DriveTronic feeder
KBA’s DriveTronic feeder has no mechanical gears, longitudinal shafts or other energy-guzzling consumable parts. In their place are direct drives which are much more efficient. Proportional valves, in conjunction with a self-regulating air-compression cabinet, ensure that only the volume of blower and suction air actually required at the sheet separator is provided. This means a lower energy input for the air supply. Individual, distributed blowers at the suction belt ensure an energy-efficient sheet transport.
DriveTronic SIS sidelay-free infeed
Unlike mechanical or pneumatic systems, KBA’s sidelay-free DriveTronic SIS infeed, which is now available as an option in every format class, requires no air suction and therefore also reduces the amount of energy consumed by the air-supply system.
Energy-saving roller-bearing technology
Smooth-running roller bearings with reduced backlash allow the impression cylinders and transfer drums to be rotated with very little effort using a hand crank. This bearing technology, which has been incorporated in KBA presses for many years now, is a major factor in cutting the Rapidas’ energy consumption. The venturi effect is exploited to reduce the volume of blown air applied at the sheet guides. Spoilers at the transfer drums are effective in preventing undercurrents.