26 PRODUCTS & SERVICES
Pulp Paper & Logistics
Calendering technology brings pilot line conditions to production
N
ewly patented calendering technology,
which is aimed at
lightweighting papers without compromising functional and visual properties while reducing energy consumption and raw material use, has been launched by Valmet. With the first installation at a
Stora Enso mill, Aqua Cooling technology is said to improve the calendering results compared to usual paper production conditions. Valmet says that in most cases the best calendering results are
achieved when the web is cool and stiff, such as in pilot trials. With Aqua Cooling, a pilot- type environment is brought to production-level, by cooling down the web before the calendering nip. This is enabled by applying a small amount of water with a moisturizer, and evaporating it with an air dryer. Aqua Cooling calendering
technology will complement Valmet’s bulk-saving calendering offering, which includes the revolutionary metal belt calendering as the ultimate lightweighting solution. Valmet has a pilot machine with Aqua
Cooling technology available for customer trials. “Improving energy, water and
raw material efficiency are the key targets in Valmet’s research and development work. Our innovation in Aqua Cooling calendering technology is a good example of how we can improve the customer’s product quality and raw material efficiency. With Aqua Cooling calendering technology it is possible to get almost half of the metal belt calendering benefits with
May/June 2015
significantly lower investment costs,” says Mika Viljanmaa, calendering technology development manager at Valmet and 2012 Marcus Wallenberg Prize winner for his ground- breaking development of metal belt calendering technology. First installation of Aqua Cooling is on Stora Enso’s PM4 machine at its Ingerois mill in Finland, which produces high-quality folding boxboard for consumer packaging needs such as food, confectionery and pharmaceutical products.
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