Arauco Plans MDF to OSB Conversion

Chile-based Celulosa Arauco y Constitución S.A. (Arauco) has selected Dieffenbacher to supply an OSB plant to replace an existing MDF line at its Trupan site in Cholguán in the Bío-Bío region of Chile. The plant is scheduled to start production in the second half of 2026.

“We operate eight production lines from Dieffenbacher, and they’re all running great,” says Tito Jara, Composite Panels Corporate Industrial Director at Arauco. “That’s why we chose Dieffenbacher for this brownfield project to convert our Trupan I MDF line into a state-of-the-art OSB line.”

The new plant will be built around an existing 10-opening press. The Dieffenbacher scope of supply will range from the wood yard with debarking to raw board handling including pneumatic systems and plant electrics and automation. Arauco has included a MAIER rotor debarker, an OSB disc screen and a belt dryer in the order.

The interaction of rotation, friction and surface moistening of the logs makes the fully automatic MAIER rotor debarker highly efficient. The logs are laterally fed into the trough, set into rotation by long rotors with debarking tools and moved to the discharge area by the tilt of the rotors. The OSB disc screen separates the strands into two or four fractions. In a first step, equalizing rollers spread the infeed strand-flow, pre-screen it and loosen it up. Two-disc roller decks then separate the strands according to their length.

Featuring low thermal energy consumption, Dieffenbacher’s belt dryer saves costs and supports sustainability because it works at lower temperatures than drum dryers and can use low-calorific energy from the waste heat of other plant components that would otherwise remain unused. In addition to its high capacity and variability, the belt dryer features easy and product-friendly material transport. Its self-supporting construction requires only a small footprint, and its modular design makes it adaptable to different capacity requirements and is easily expandable.