Papierfabrik Palm: Voith supplies calender rolls with heating for PM 7 at King’s Lynn

Rolls cast at Hüttenwerke Königsbronn foundry.

Ten years ago Papierfabrik Palm put the PM 7 supplied by Voith into service at its King’s Lynn facility in the UK. Voith has now been engaged to supply new calender rolls with heating system for the newsprint paper machine. The rolls are scheduled for completion by the end of the year.

Rolls cast at the Hüttenwerke Königsbronn foundry
The scope of the order consists of identical calender rolls and a new heating system. The calender rolls are being cast at Hüttenwerke Königsbronn in the Heidenheim district, a foundry that can look back on a 650-year history.

The casting for the roll tube has an outer diameter of around 1.6 meters, is about 11 meters long and weighs approximately 76 metric tons. The material used is ductile cast iron, which allows the finished calender rolls to be heated up to a surface temperature of 210°C. “These dimensions make them the heaviest calender rolls worldwide made from the modern material CDI”, says Christian Tenbruck, Vice President Sales & Application at Voith. The rolls also undergo an induction-hardening process during fabrication. Higher load capacity, fatigue strength and durability are just some of the benefits of this hardening process.

High-quality newsprint and excellent printing results
Thanks to close collaboration between Voith and Papierfabrik Palm, the PM 7 was able to go into production operation three weeks earlier than scheduled in 2009.
The newsprint machine has a wire width of 11,400 mm and is designed for a maximum speed of 2,200 m/min. At a production capacity of 400,000 metric tons per year, the machine produces improved paper grades from

100 percent recovered paper in the basis weight range 40–52 g/m² in addition to standard newsprint. The modernization will further improve paper quality and extend the company’s product range.
The order for the calender rolls is a further vote of confidence in Voith and a continuation of the longstanding and successful business relationship between the two companies. The transport of the completed rolls to King’s Lynn is scheduled for May 2020.

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