A row of DD-Washers

ANDRITZ pulp washing

Proven technologies with the highest efficiencies

From brownstock to bleaching, washing plays an essential role in maintaining pulp quality throughout the fiberline. ANDRITZ delivers washing solutions that not only result in high quality pulp, but are also efficient and environmentally friendly.

Pulp washers are essential to fiberline performance – from the initial cleaning of the brownstock to the final pulp washing. The washing result at one stage affects all the subsequent stages, so the choice of washers is critical.

No matter what the washing application or position in the fiberline – in greenfield or upgrade situations – ANDRITZ can provide superior washing solutions that result in high-quality pulp being produced in an energy-efficient, environmentally friendly way.

ANDRITZ provides also other washing equipment suitable for special requirements, such as the PD pressure diffuser washer. For all ANDRITZ washing systems, advanced ACE controls and IoT solutions for intelligent maintenance and control are available.

ANDRITZ washing technologies


DD-Washer drum displacer washer

With almost 400 installations around the world, the ANDRITZ DD-Washer drum displacer washer is clearly preferred for all fiberline washing applications – brownstock, post-oxygen and bleaching. Its key benefits 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. The DD-Washer drum displacer washer is extremely gentle to fibers because no mechanical pressing is required for washing.

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COMPACT PRESS wash press

The ANDRITZ COMPACT PRESS wash press has been developed to maximize dilution-extraction, displacement and final pressing during the wash cycle. Feeding the COMPACT PRESS wash press at higher consistencies and making greater use of the drum surface provides superior washing capability within a small footprint, making it the best wash press on the market. It is built around the UniWash process concept. This concept has three main features: UniFeed pulp distribution system; high pulp consistency in the wash zone; and low wash liquor velocity. The COMPACT PRESS wash press is built to last, so it requires little maintenance - and when it does need to be serviced, it has several easy-maintenance features that make the task easy.

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GasFree (GF) Filter

GasFree Filter vacuum drum washer

The ANDRITZ GasFree Filter (aka GF-Filter) is an advanced vacuum drum filter washer. GF-Filter washers can be used for brownstock, post-oxygen, and bleach plant washing. Most typically, they are installed as a retrofit to an existing line, and can complement the washing process in special cases when only one stage of washing is required and the washing stage temperatures are not high. They are also suitable for greenfield installations in mills with special requirements (low capacities or non-wood pulps for example).

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The COMPACT PRESS: Completing the ANDRITZ washing range

Along with the well-known DD-Washer, the introduction of the COMPACT PRESS now means ANDRITZ covers the complete range of solutions available for effective and efficient pulp washing for all capacities of pulp mills, from the very small to the very large.

DD-WASHER PLUS - A Hidden Gem in the Fiberline

Well over 400 ANDRITZ DD-Washer drum displacer washers have been installed on fiberlines at pulp mills all around the world, where they quietly and consistently deliver remarkable results for pulp producers. The fourstage washer has gone through numerous updates and developments since it was first launched in the 1980s, and now the ANDRITZ DD-Washer PLUS next generation drum displacer washer is the first choice of the largest and most efficient pulp producers across the globe.

Key Equipment - DD Washer

With more than 340 installations in 24 countries, the multi-stage washing efficiency and extremely high production throughput of the DD-Washer is clearly preferred for all fiberline washing applications – brownstock, post-oxygen, and bleaching. The largest DD-Washer today has almost 150 times the capacity of the first washer sold.

Key Equipment: Enhanced services for ANDRITZ DD-Washers

With installations in 24 countries, the DD-Washer is clearly preferred for fiberline washing applications. To support this installed base, ANDRITZ has developed a full range of monitoring, diagnostic, and support services to reduce lifecycle costs and keep availability high.

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  • DD-Washer - Getting the most out washing PDF : 438 KB
  • COMPACT PRESS wash press - Superior washing PDF : 277 KB