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Valmet introduces roll covers made of recycled and renewable raw materials  

Finland-headed energy and forest industry technology provider Valmet Oyj is the first company in the world to offer roll covers based on biomaterials and recycled materials for board, paper, tissue and pulp making. These new composite covers for press, guide, and calender rolls are now available for the first customer deliveries.

“In best cases, bio-based materials can be produced from plant parts that would otherwise be wasted. For example, lignin, carbon black made of lignin and nanocellulose can be utilized as reinforcing fillers in roll covers,” explains Jani Turunen, R&D Manager for Polymeric Roll Covers, (right) with Pertti Hytönen, R&D Engineer (photo courtesy Valmet).

“In best cases, bio-based materials can be produced from plant parts that would otherwise be wasted. For example, lignin, carbon black made of lignin and nanocellulose can be utilized as reinforcing fillers in roll covers,” explains Jani Turunen, R&D Manager for Polymeric Roll Covers, (right) with Pertti Hytönen, R&D Engineer (photo courtesy Valmet).

In new composite roll covers Valmet uses bio-based resin and hardener in the polymer matrix. The reinforcing fiber and filler are originating from recycled consumer plastic and glass. Depending on the cover type, the content of recycled or bio-based raw materials is 75-96 percent.

New materials are being tested continuously, and the target is to reach 100 percent as soon as possible.

Valmet has set strict criteria for the bio-based raw material in the covers. Only renewable materials derived from non-food chain plants or plant parts are used, in order to prevent the effect on global food production. Cultivation and harvesting of plants must not endanger the growth of natural forests either.

In best cases, bio-based materials can be produced from plant parts that would otherwise be wasted. For example, lignin, carbon black made of lignin and nanocellulose can be utilized as reinforcing fillers in roll covers. Our customers do not have to compromise in product performance either, as the results have shown that in some applications the performance is even above the traditional offering, explained Jani Turunen, R&D Manager for Polymeric Roll Covers, Valmet.

More sustainable with a new generation of roll cover materials

Roll covers used in paper, board, tissue, and pulp making need periodical renewal and thus consume tons of materials. A major part of the raw materials of traditional roll covers has been manufactured from fossil-based materials, which has been refined and processed from crude oil.

Valmet’s R&D work focuses strongly on enhancing raw material and energy efficiency and promoting the use of renewable raw materials. Valmet is continuously investigating the possibilities to replace fossil-based materials with renewable or recyclable materials. For example, recycling and more sustainable use of ceramic and metallic roll covers are under active research.

Our continuous investment in R&D of sustainable solutions for our customers helps us increase the occupational safety of our employees, replace fossil-based raw materials with renewable ones, re-use and recycle materials and save energy. This is our contribution to the global challenge we face regarding our planet’s future. And by doing this, we are helping our customers do their part as well, said Jukka T Heikkinen, Senior Manager, Roll R&D, Valmet.

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