Speciality from Radebeul: UV inert drying in sheetfed offset
Along with the live press demonstrations, Jürgen Veil introduced the new VariDry UV dryer made and developed entirely by KBA. It is particularly energy efficient thanks to cutting-edge reflectors and less distance between lamps and substrate. Further benefits include a reduction in diffused light, UV radiation and the build-up of heat. The efficiency of UV lamps is continuously checked as UV output is measured directly on the lamp by a sensor. Lamps can be exchanged in just a few seconds by hand. Along with classic UV dryers, KBA also offers UV inert dryers for medium- and large-format Rapidas as a speciality. These offer enhanced crosslinking as well as fewer risks in terms of migration and odour if the consumables are tailored to the conditions in the inert chamber. A short time ago in sheetfed offset it was not possible to create a stable nitrogen barrier. Reasons for this were the gripper system, the open cylinder gap and the large distance between the printing cylinder and inert chamber, plus rigid substrates coming into contact with the inert chamber. KBA has solved this problem with its new AirTronic Drum suction cylinder. Mr Veil used the example of the 19-unit Rapida 106 with inert equipment at Amcor Tobacco Packaging in Rickenbach, Switzerland when explaining the process. Along with an outstanding print and finishing quality, it also eliminates the need for additional process steps in producing high-quality migration-sensitive packaging.
A further presentation focused on calculating the output of a press according to OEE (Overall Equipment Effectiveness). Press efficiency is determined by three factors: availability, performance and quality.
Highlights in all format classes
Along with the official premiere of the Rapida 164, participants were treated to presentations on six other sheetfed presses from half-size to large format. The spectrum ranged from packaging production on a Rapida 75 up to commercial production with fast job changes on a Rapida 145. Highlights included: printing cosmetic packaging on a brand-new Rapida 76 equipped with almost all automation options found in the Rapida 106, such as DriveTronic SIS and DriveTronic SPC, 4/4-colour high-speed commercial production including fast job changing on a ten-colour Rapida 106, producing commercial jobs on a six-colour Rapida 145 with coater at speeds of up to 17,000sph, printing at 20,000 sph with inline colour control according to grey balance with InstrumentFlight from System Brunner on a five-colour Rapida 106 and last but not least producing intricately finished packaging on a double-coater Rapida 106 with inline cold foil finishing (KBA ColdFoiler). In addition, for the first time KBA showcased four-back-four production on an eight-colour Rapida 105 with HR UV dryers. Overall the international sheetfed offset experts gained an insight into the high standard of printing and finishing technology inside the KBA Rapidas in all format classes.
The guests enjoyed an evening steam boat river cruise on the Elbe with views of the baroque old town and the Elbe palaces nearby. Thankfully water levels have returned to normal after this year's serious flooding affecting the region and luckily Dresden was not as badly affected as it was in 2002.