1. Rhewum MDS: A Compact screen, ideal 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 Rhewum mds 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 MDS system allows to compile the rectangular sieve decks into a stack and thereby offers a large screening surface on a small space.
2. Rhewum WAF: 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 Rhewum waf solves these problems. The WAF is a combination of a directly excitated sieve and a linear vibrating conveyor.
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 of the WAF makes it possible to adjust the inclination of the screening machine even during operation. This reduces considerabley the loss of the valuable product and avoids unnecessary downtimes.
3. Rhewum Powder jet 400: Batchwise powder screening.
The PowderJet 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.
