At the end of the printing process in the heatset method, the printed, wet paper webs need to be dried. In conventional heatset printing, this is done using separately operated technical dryers. The process of generating the heat required, however, is extremely energy-intensive and leads to a high additional use of final energy.
The hot gas supplied with the help of hot gas logistics is fed to the printing presses' dryers separately during the drying stages. The hot gas, when it reaches the first stage of the drying process, has a temperature of around 360°C. With the addition of ambient air, the temperature in the first stage is reduced to around 280°C. In the second stage, the temperature after the addition of ambient air is 180°C, and 120°C in the third and final stage.
At Jungfer, the entire process is completely different. This is because we have completely turned this technically essential process on its head and redesigned it from scratch. With gas combustion in our own turbine power plant, we produce not only electricity but also automatically around 7,000 kW of hot gas - which is more than enough to supply our dryer systems directly with the hot air they need. The high, but most importantly additional energy demands associated previously with generating this hot air are therefore completely obsolete. At the same time, however, we also use the hot gas for another process that is completely new and revolutionary in the printing industry: the
recovery of resources