Ultrasonic sieving Details

Ultrasonic sieving using MMM Multifrequency technology

MPI now offers the industry’s most advanced ultrasonic technology for sieving and screening applications. Our patented MMM (Multifrequency, Multimode, Modulated) ultrasonic generators can stimulate highly efficient wideband (sonic to megahertz) acoustic energy to nearly any sieve or screen shape.

How it works:
  • MMM (Multifrequency, Multimode, Modulated) eliminates the standing waves seen in fixed frequency systems.
  • Eliminates binding in low amplitude nodal points
  • Eliminates damage to screens in high amplitude nodal points.
  • By eliminating hot spots on the screen we can increase power to the entire screen and improve the rate of material processing.

Result: Greater sieve/screen stimulation improves process flow rates beyond the limitations of standard fixed-frequency ultrasonic sieving systems.

Advanced programmable features:
  • Fully programmable power and modulation technology - adjust power from 1% to 100%
  • Center Frequency settings (large interval)
  • Pulse Width Modulation Period (Period 10 ms to 1,000 ms)
  • Pulse Width Modulation Ratio (0% to 100%)
  • MMM special modulation settings (fast sweeping, sweeping, & tracking)

Result: Greater flexibility when processing all kinds of powders and the ability to process sticky and difficult powders.

Our special ultrasonic transducers for sieving and screening feature explosion-proof housings and cables
Equipment built specifically for sieving applications:

Our MMM wideband transducers are built into special explosion-proof housings for powder processing environments.


Versatile installation options:

Our systems adapt to the resonant frequency of any screen frame attached to the converter within a 12 kHz window eg. 25 kHz to 37 kHz giving optimum performance in ultrasonic screening and sieving operations.

  • MMM technology will drive most any shape (round, oval, square, rectangle) sieve or screen, even large mass systems.
  • MMM ultrasonic converters can be connected to any suitable point on the sieve, screen or frame.
  • Ring resonators can be simplified and produced at lower cost, since specific tuning is not required.
  • Standard power modules in 300 watts, 600 watts and 1200 watts. Systems up to 20 kW on request

Result: MMM ultrasonic sieving systems adapt to suit your process and equipment requirements.

Our multifrequency ultrasonic converters and generators are covered under international patents - see EP1238715
Commercial options:
  • New equipment built to your requirements: For all shapes and sizes of sieve, all power levels, all kinds of powder or liquid sieving and filtering.
  • Retrofit to other manufacturer's equipment: MMM generators can adapt to other manufacturers sieving transducer and screen, allowing a simple field upgrade to your installed ultrasonic sieving equipment.
  • Systems for OEM suppliers: Build and brand your own ultrasonic sieving equipment, avoiding all existing patents and getting the best possible performance.

For more details of MMM Ultrasonic Sieving please download the powder sieving presentation on pdf from our download server. (Note - The pdf file is 12Mb and will take a long time to load fully. We recommend you right click the link and select "Save Target As" to download the file direct to your hard-disk. If you click the link it will open in a new window to allow you to continue browsing.)