Wet Sieving Unit Delivers Short Measuring Times
Well-known for its Alpine air jet sieve for laboratory sieving and particle size measuring of fine powders, Hosokawa Micron has now introduced the Viblette VBL for fast and accurate wet sieving in the laboratory. The new unit can be used for applications when wet sieving has to be used for analysis due to the dry material’s highly cohesive nature. Examples of such materials would be carbon black, some mineral fillers and some dielectric materials.
This Viblette VBL uses enhanced vibration to deliver short measuring times up to one third those of conventional wet sieves. The electro-magnetic vibration mechanism breaks the liquid film formed on the sieve surface, which is reportedly a problem with other wet sieving devices. This ensures effective powder wetting and short sieving times.
The incorporation of specially designed showering nozzles allow the Viblette VBL to achieve accurate sieving using up to one sixth the amount of water compared with conventional wet sieves.
Liquid is sprayed through sprinkler shower nozzles onto powdery sample on the sieve. The sprinkler rotating above the sieve is driven by liquid pressure and the design ensures even wetting of the powder and independent control of both liquid rate and rotation speed is provided to ensure maximum versatility. There is very little wash liquid waste.
Repeatability of testing is ensured as sprinkler rotation, liquid rate and the amplitude of vibration can be varied and controlled to preset levels. This ensures consistent repeatability and very accurate measurement of particle size.
In addition to the standard 200 mm drum size, an adaptor is provided so that 75 mm sieves can be used up to three sets for simultaneous measurement. Even 10 µm screening is possible with the new Viblette VBL.
The Viblette VBL can process quantities of slurry up to 10 l per minute and uses a special optional feeding device for this application as required.
Hosokawa Micron Ltd, +44 1928 755100, info@hmluk.hosokawa.com, www.hosokawa.co.uk.