Results of the conversion of the Kehl PM1 press section
The paper industry worldwide faces the challenge of producing more sustainably and significantly reducing its CO₂ footprint. With its company-wide “Green Paper Strategy,” Koehler Paper is pursuing the goal of gradually achieving CO₂-neutral paper production at all its sites. To achieve this, the company relies on a holistic approach that encompasses both technological innovations in paper machines and substantial investments in renewable energy sources. In addition to expanding wind power, solar installations, and a biomass power plant, targeted modernization projects at the production facilities play a central role.
A key element of this strategy is the conversion of existing press sections to modern shoe press technology. Following the successful rebuilds of PM5 and PM4 at the Oberkirch site, the press section of PM1 in Kehl was converted from a DuoCentriII press to a DuoCentri NipcoFlex press with innovative shoe press technology by Voith in early 2025. The aim was to significantly increase post-press dryness, thereby reducing steam consumption in the pre-dryer section by an average of 31% and in the overall plant by around 20%. These measures led to a significant reduction in CO₂ emissions at the Kehl site and make an important contribution to Koehler’s climate targets.
In addition to improving energy efficiency, further key enhancements were achieved: Plant flexibility was significantly increased, as new paper grades with basis weights starting at 30 g/m² can now be produced. At the same time, paper quality was further optimized. The new transfer concept, along with the significantly reduced number of web breaks resulting from the rebuild, contributed substantially to increased plant efficiency. Furthermore, occupational safety was further enhanced by introducing a full cantilever press frame.
The project was implemented in close cooperation between Koehler Paper and Voith. Thanks to careful planning and preparation, the rebuild was completed within a short downtime, allowing production to resume quickly. All targets regarding energy efficiency, product quality, plant flexibility, occupational safety, and operational reliability were fully achieved.
With the successful rebuild of Kehl PM1, Koehler Paper has set another milestone on its path to CO₂-neutral paper production. The project serves as a prime example of how innovative machine technology, sustainable energy supply, and close collaboration between Koehler and Voith can jointly enable decisive progress towards climate neutrality—setting new standards for the entire industry.