This is how everyday life can look like in the powder and bulk industry. Industrial screening is not a piece of cake. It needs a lot of experience and sensitivity to adjust screens correctly and to avoid unplanned downtime.
Up to now quality control of the screening process is sporadic. Samples of the screened product are drawn and normally analyzed with very expensive and sensitive measurement technology in the laboratory. It takes several hours until the results are available and the product often is already
This is why it happens regularly that screen breakages remain undetected for a long time and in the best case many tons of bulk material “only” have to be screened again. This has a very negative impact on the efficiency, but the consequential damage can also be much higher. Complete batches may have to be disposed.
In case a screen is overrun large quantities of accepted product flows off with the oversized particles. Depending on how the oversized particles are treated, this means either loss or the load on the mills goes up unnecessarily.
DYNA Instruments, a specialist for powder and bulk measurement technology based in Hamburg (Germany), now has a solution for this.
The particle size measurement instrument DYNAsize is installed directly underneath screening machines and measures the particle size distribution in real time – inline and online. The system uses a high precision optical measurement method which detects particle size differences to 85 µm. In the product stream, up to 10,000 particles per second are measured and evaluated. Limits for the upper and lower particle size can be set individually and activate two relays if the set points are exceeded. A software that is included in the system allows the continuous visualization of the actual particle size distribution. With an integrated digital recorder this can be shown over time (last hour/day/week).
The measurement system is maintenance-free because of an integrated air purge that prevents staining of the optics.
Also, the device can be used for real-time product inspection, monitoring the milling process or – again, screening – to detect clogging of material on the screen linings.Click for more information about DYNA Instruments GmbHClick for related articles online