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Valmet Roll Covers Made of Recycled and Renewable Materials

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Valmet 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 calendar rolls are now available for the first customer deliveries.

In new composite roll covers Valmet uses bio-based resin and hardener in the polymer matrix. The reinforcing fiber and filler originate from recycled consumer plastic and glass. Depending on 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 to 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 waste. 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, Valmet. “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.”

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 is under active research.

 

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