Wash screw press


Wash screw presses from Lackeby Products are developed and dimensioned for heavy duty and efficient dewatering. The design is based on long experience and both minimises and simplifies maintenance work.


The company’s screw presses are based on a screw conveyor, which transports the material into the press unit. Material is washed during transport and dewatered in the unit’s perforated dewatering zone. A plug of dewatered material is formed at the outlet end due to the resistance created by three counterforce plates which is the key to reach the very high amount of dry substance.


The press unit is equipped with an inspection hatch to make maintenance simpler and enable inspection of the press pipe. As standard, screw presses are made in stainless steel (1.4301) or (1.4436) with LDX wear plates. The new design reduces the friction between the spiral and the wear plates to a minimum bu using the compressed waste as a “bearing”which lifts the spiral to a center position. Spirals are made of black material (S355J0) as standard, but are also avaliable
in stainless steel.

Technical features

Process benefits

  • New screenings washing system
  • New press pipe cleaning system
  • New through design
  • New spiral design
  • New press system – Higher dry solids
  • Secure operation
  • Robust design
  • Simple inspection via a hatch in the press unit
  • Enhances efficiency of dewatering and transport, and minimises wear
  • Prolongs service life
  • Makes flushing and maintenance easier
  • Minimises risk of clogging


  • Paper and pulp
  • Slaughterhouse waste
  • Municipal and industrial wastewater screenings
  • Fruit and vegetable waste
  • Brewery waste


Lackeby Products has more than 40 years’ experience of designing and producing shaftless screw conveyors, and has supplied more than 1.000 screw conveyors and screw presses to both industrial and municipal plants worldwide.