A row of DD-Washers
  • PULP & PAPER products
  • Pulp production
  • Kraft pulp
  • Fiberline
  • DD-Washer drum displacer washer


Superior washing, globally preferred and proven

The proven multi-stage washing efficiency in the ANDRITZ DD-Washer drum displacer washer is clearly preferred for brownstock, post-oxygen and bleaching washing – with more than 380 installations all around the world. Key benefits of the DD-Washer are its low operating costs, low emissions, and extremely high washing efficiency in a design that offers a flexible number of displacement washing stages in a single unit.

Efficient washing without mechanical pressing

The ANDRITZ DD-Washer provides superior washing while being extremely gentle to fibers since no mechanical pressing is required for washing. The washer can be flexibly configured with from one to four displacement washing stages in a single unit, which greatly simplifies mill layouts and plant efficiency.

 An innovative design which allows the use of fractional filtrates reduces the amount of chemicals required for oxygen delignification and bleaching. With its single motor and no energy utilized for mechanical pressing, the DD-Washer is extremely energy efficient. Countercurrent washing allows reuse of water – lowering consumption and sending less effluent to the treatment plant.

 Increased throughput

Recent innovations to the pulp and filtrate hydraulics increase throughput: the largest unit today is 6,250 t/d – more than 150 times the capacity of the first DD-Washer when it was introduced in 1983.


DD-Washers in MetsäFibre's bioproduct mill. Äänekoski, Finland.

The characteristic angular shape of the DD-Washer, clearly seen in this 3d rendering, is an increasingly common sight in pulp mills around the world.

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  • DD-Washer - Getting the most out washing PDF : 438 KB