ANDRITZ with successful upgrade of two screw presses for Metsä Board Joutseno

Thursday, Oct 05, 2017

International technology Group ANDRITZ has successfully started up another upgraded screw press installed at the Joutseno mill of Metsä Board, Finland. This upgrade follows a separate screw press rebuild for Metsä Board Joutseno that was completed successfully in late 2016.

The rebuild of both screw presses (#21 and #22) included installation of a new Low-Energy Screw Shaft (LESS) as well as split grooved baskets for the medium-pressure zone in order to widen the operating window of the presses and allow higher production rates. The design of the LESS enables a new compression curve, resulting in a higher throughput at the same installed power.

The screw press upgrades are part of the step-by-step optimization of the BCTMP (bleached chemi-thermomechanical pulp) process that is currently in progress, with the overall aim of improving the availability of the plant. Press #21 is used as a wash press, and press #22 acts as a secondary stage in the washing process.

Metsä Board is a leading European producer of premium fresh fiber paperboards, including folding boxboards, food service boards, and white kraftliners. The company is part of Metsä Group, a Finnish forest industry group that operates in some 30 countries. The Joutseno mill produces BCTMP for Metsä Board’s own board mills and has a production capacity of 320,000 t/a.



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