Another issue can come from the type of mesh installed in the sieve. The mesh wire size in facts can have some influence on the possibility for each particle to pass or not the mesh aperture, hence on the flowrate, since it has an impact on the total open surface area. On the other hand, meshes are now manufactured with far more accuracy than in the past, which means that sieving efficiency is also more directly connected than earlier to the required cut point.
Q: Which solutions do you recommend for obtaining maximum sieving accuracy?
A: At Virto-Cuccolini, we have a long experience in powder sieving. We do apply different sieving technologies based on Customer’s requirements in order to offer the widest possible range of solutions for their sieving needs: traditional vibrating sieving, ultrasonic sieving and multi-frequency sieving. Based on the hundreds of tests carried out on behalf of global metal powder producers in the recent years, we can confirm that the best combination of quality parameters was given by our patented Multi-Frequency X-Line Technology, also in case of spherical particles. Ultrasonic sieving – with expansion and contraction of the mesh in order to facilitate particles flow – is not able to guarantee sieving accuracy within a field of application – metal powders – where fine size is a must now. Moreover, this method is slowing down the sieving process and makes it in the end less productive than needed. We at Virto-Cuccolini, based on our accumulated know-how, investigate Customer’s specific application and context each time to check each key parameter, such as: core principle of mechanical sieving, selected mesh and its properties, particle size distribution (PSD) of Customer’s product, its bulk density, the impact of gravitational force on the product, the coefficient of friction between mesh and powder, the effect of vibrational forces produced by our sieving equipment.
It is with almost two decades of dedicated study and research, that we came to the solution – which we proudly confirm even now – of X-Line Multifrequency-Technology sieving equipment. Each one of the typical sieving issues, including sphericity of the powder, was tested and overcome through our multi-frequency sieves, in the range from 10 to 350 µm. We are glad to invite our Customers to carry out sieving tests and compare X-Line performance with that of their current sieve, to find out how easy the sieving process can be.
VIRTO changes the screening game.