Albert Bauer PRINT!

At Albert Bauer PRINT! in Hamburg, a subsidiary of Albert Bauer Companies, the constant attainment of uniformly high print quality is a fundamental prerequisite for acquiring print jobs and accomplishing them cost effectively. Print errors jeopardize both the customers' trust and the cost efficiency of production. A vital component here is the paper, which accounts for more than 50% of the cost of a print job and must therefore be used as thriftily as possible. However, its efficient use depends to a great extent on the quality of the room climate: if the air in the room is too dry, the paper becomes statically charged. Then, the sheets stick together, and double feed can occur. If, on the other hand, the room climate is too damp, the paper absorbs some of this humidity. 

This hygroscopic reaction can have a negative effect on the printed image, and in the worst case the paper can ripple and become unusable.

In the end, any of these events necessitate repeat printing, and make large dents in profit margins due to increased material consumption.

In order to prevent this scenario before it arises, and to keep paper in optimum condition during storage, printing and further processing, a process-optimized room climate was established in Albert Bauer's 522-square-meter print room. The desired room temperature was between 20 °C and 22 °C, and the relative humidity 50 %. These ambient conditions keep both electrostatic charging and poor quality due to humidity at bay.

Albert Bauer PRINT! decided to use two STULZ BNB 5000 Ultrasonic direct room humidifiers with a central water treatment system. The units work on the principle of ultrasonic humidification and achieve a humidifying output of 5.0 kg/h at a power consumption of 430 VA. STULZ direct room humidifiers use up to 90 % less electricity than conventional electrode or resistance steam humidifiers. The long maintenance interval of one year brings an additional cost advantage. Moreover, thanks to their continuous supply of fresh water from the central treatment system, the units provide humidification with a high level of hygiene as per VDI standard 6022. In addition to the two direct room humidifiers, the Albert Bauer print room hosts a STULZ MiniSpace CCU 110 CW closed-circuit air conditioning unit for a constant temperature and humidity.

This powerful precision air conditioning unit, which has a small footprint, is connected to the building's central cold water supply and the use of EC fans that can work in partial load mode make it an extremely energy-saving model. Furthermore, the company makes the most of the cool outside air of the Hanseatic City of Hamburg to further increase the energy efficiency of the air conditioning system. To do this, special supply and exhaust air ducts were installed for Direct Free Cooling. To guarantee a constant temperature and humidity in the print room in Free Cooling mode, the supply air duct was fitted with an outside air filter, a heating coil, and a temperature and humidity sensor. 

The installation of STULZ direct room humidifiers and closed-circuit air conditioning units has brought about the desired success: the air in the Albert Bauer print room constantly shows a temperature between 20 °C and 22 °C, and a relative humidity of 50 %. Thanks to this optimized room climate, the number of print errors has been permanently reduced, with both customer satisfaction and the cost efficiency of print jobs rising as a result. The MiniSpace precision air conditioning unit is connected to a supply air and exhaust air duct, and its Direct Free Cooling function enables energy saving air conditioning of the print room.

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