Ruukki makes extensive delivery to Metsä Group’s bioproduct mill

Oct 31, 2017

Officially opened on 18 October, Metsä Group’s new generation bioproduct mill in Äänekoski, Finland is the first of its kind in the world. Besides pulp, the mill produces other bioproducts such as tall oil, turpentine and biogas. Costing in excess of €1.2bn, the bioproduct plant is the largest investment ever in the history of Finland’s forest industry. The construction project was a major project also for Ruukki, which among other things supplied the steel frame and sandwich panels for the walls of the recovery boiler plant and the sandwich panels for the walls of the bioproduct mill. Ruukki supplied almost 50,000 square metres of sandwich panels for the entire Äänekoski construction project. (Steel made by SSAB was used in the products supplied by Ruukki.)

Picture: Metsä Group

Picture: Metsä Group 

Because this is a major construction project, Metsä Group highlighted the reliability, delivery capability and punctuality of partners, and their ability to keep to schedules. Since there were a number of construction projects under way at the same time at the bioproduct mill site, actual construction required logistics skills. Deliveries had to be planned to precision to ensure smooth site logistics and to keep the schedule on track.

Joint planning at the start of the project between the customer, design, manufacturing and installation ensured the smooth flow of several jobs at the same time. UKI Arkkitehdit Oy were the lead architects with responsibility for architectural design of the bioproduct mill. Among other things, they ensured the materials, including the façades and panels, were suitable for a large industrial complex.

“This is a significant Finnish industrial investment with many fine examples of companies working together. We are proud that Ruukki was chosen to be involved in the project,” said a delighted Sami Eronen, head of Ruukki Construction.

Ruukki supplied and installed the steel frame, the sandwich panels used in the walls and the load-bearing sheets for the roof of the recovery boiler plant. Ruukki prefabricated the components for the steel frame as much as possible at its own plant. This reduced the work to be done at the site, speeded up construction and improved safety. The recovery boiler plant has a surface area of more than 2,300 square metres and, at a height of 86 metres, the plant is 14 metres taller than the tower of Helsinki Olympic Stadium.

Ruukki supplied the sandwich panels, including design, for the bioproduct mill. Design included wind and fire load design and the design of panel installation. Ruukki also supplied the load-bearing roofing and façade claddings for the mill building.

The steel frame was made at Ruukki’s plants in Peräseinäjoki and Ylivieska in Finland and in Oborniki in Poland. The sandwich panels and load-bearing roofing sheets were made in Finland in Alajärvi and Vimpeli respectively, and the rainscreen panels were made in Estonia at Ruukki’s plant in Pärnu.

Ruukki’s delivery:

Recovery boiler plant: delivery, including installation:

  • steel frame, 4,000 tonnes
  • sandwich panels 20,000 square metres
  • load-bearing sheets

Mill building, delivery, including installation:

  • sandwich panels 28,000 square metres
  • cladding lamella, 1,000 square metres
  • load-bearing sheets

Go to for more information about the bioproduct mill:

Media service: Tapani Tuominen, Ruukki Construction, tel. +358 50 314 3131,

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