6 July 2021. Designed as one of the most efficient specialty paper machines in the world, Koehler Paper commissioned Voith's production line 8 at its Kehl mill at the end of October 2019 - after a previous project time of only around two and a half years.

Thanks to ongoing optimization, the company recently achieved a groundbreaking level of performance for the production of around 40 gsm base paper at a continuous speed of more than 1,400 m/min. Thanks to intensive cooperation, permanent project support and continuous optimization from Koehler and Voith, the line achieved an average speed of 1,410 m/min over a period of 24 hours as well as a maximum value of 1,432 m/min - a world record for the MG paper machine.

On the occasion of this event, Voith presented Koehler Paper with an engraved glass plate that records this historic speed record. At the award ceremony at the Kehl mill last week, Dr. Michael Trefz, President Projects at Voith, was pleased to present the recognition: "An outstanding value, which was made possi-ble by the cooperation between Koehler and Voith, the combination of extensive technical knowledge and a long-standing and trusting partnership. Koehler and Voith are thus once again demonstrating their pioneering spirit in paper production." Dr. Stefan Karrer, COO at Koehler, and Joachim Uhl, Mill Director in Kehl, also appreciate the cooperation and are proud of the team's performance on production line 8: "The optimizations have enabled us to raise our machine to a new level."

Joint development of trailblazing packaging paper products
Another outcome of the collaboration between Koehler and Voith is the development of cutting-edge products. As part of the development partnership for new paper grades, Voith carried out several test series on the R&D pilot coater at the Voith Paper Technology Center in Heidenheim. The technological requirements of the new paper grades were investigated in depth and then implemented in the new production line. This has resulted in the innovative products of the NexFlex® product line, Koehler's flex-ible packaging paper.

State-of-the-art technologies for effective production
With a volume of 300 million euros, the entire production line 8 is one of the largest investments in Koehler's history. As well as the XcelLine paper machine and a offline coating machine, the project includes a BlueLine stock preparation system including wet end process and a VariPlus winder. The facility is designed to produce around 100,000 tons per year of various paper grades. An offline coating machine enables variable coating orders and combinations, resulting in an enormous range of grades. This exten-sive range of different paper grades and basis weights from 22 gsm to 95 gsm is another unique selling point of the production line. PM 8 paper machine thus supplies already finished paper and raw paper for the further finishing process.

A special technical highlight is the MG cylinder, which has a diameter of 7,315 mm, the largest of its kind worldwide at the time of installation. The cylinder gives the paper its unique smoothness, which is essential for optimum downstream processing. Thanks to the MCB air dryers, the coated paper is dried ex-tremely gently and without contact, while at the same time maintaining high thermal efficiency. A special calender design ensures final calendering of the specialty papers.

To celebrate this event, Voith handed over an engraved glass plate to Koehler Paper, which records this historic speed record.