Screening metal powder with high precision

For the separation by particle size RHEWUM offers extremely precise screening machines that allow to produce finest metal powder (e.g. for additive manufacturing) in a high quality or to process it for reutilization and separate agglomerates or dust.

RHEstack®: Compact screen for metal powders

In order to achieve the desired quality of the metal powder, all impurities, undersized particles and dust need to be removed and agglomerates have to be loosened. The RHEstack® sieves powdered metals from size of 40 μm very accurately and thereby reaches purities of more than 99 percent with a yield of up to 92 percent.

  • High-frequency unbalanced drives (up to 100 hertz) screen and transport the powdered metal linearly over the horizontally arranged screening surface.
  • Due to the high frequency and low amplitude the particles undergo a high number of micro throws which are necessary for comparing the size of the particle as often as possible with the size of the screen mesh.
  • The modular system allows to compile the rectangular sieve decks into a stack and thereby offers a large screening surface on a small space.
  • Wear-proof biconical bouncing balls keep the screen mesh reliably open and free during operation.

RHEsonox®: Screening metal powder without clogging

One substantial challenge when sieving powdered metal is to protect the screen mesh from clogging by the extremely fine particles as the cleaning and maintenance leads to loss of the high-value metallic powder and to production downtime.

  • The RHEsonox® is a combination of a directly excitated sieve and a linear vibrating conveyor that achieves better results than regular vibrating screens.
  • The linear motion is generated by two unbalanced drives and is used to transport the material.
  • The additional excitation of the screen mesh as well as the freely selectable cleaning sequences avoid clogging of any screening surface.
  • The design makes it possible to adjust the inclination of the screening machine even during operation. Loss of the valuable product and downtimes can thereby be reduced considerably.

RHEair: Batchwise powder screening

The RHEair 400 works according to the principle of batchwise air jet sifting. The finest particles are vacuumed through the screen mesh by means of a defined negative pressure, while a rotating nozzle periodically reverses the air flow and clears the screen mesh again. Possible agglomerates are broken up by the air flow in the nozzle at speeds of up to 100 m/s and the particles remaining on the screen mesh are realigned.

  • Finest automatic screening of batches up to 3 liters and separations from 200 µm up to 10 µm.
  • Compact mobile unit with integrated blower and sinter plate filter.
  • Cleaning interval by adjustable multiple rotation change of the air nozzle to keep very fine screen cloths free and thereby reduce the cleaning of the screen cloths in the ultrasonic bath.

Recommended screening machines for metal powder



Compact screening machine for metal powder > 40 μm

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Sieving metal powder without clogging screen mesh

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Powder screening of batch sizes from 0.5 to 3.0 liters

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Product examples

  • Aluminum alloys
  • Stainless steel powder
  • Cobalt-based alloys
  • Copper alloys
  • Nickel superalloy
  • Titanium alloys & titanium aluminides

Your benefits

  • Impurities, undersized particles and dust are reliably removed and agglomerates are loosened
  • Loss of the high value powder is prevented by automatic cleaning systems
  • Highest powder purity ensures the quality of additive manufactured products
  • Compact screening solutions on a small footprint for different feed quantities