The movement of a tumbler screening machine is usually compared with simple hand screening similar to the “gold washing pan”. The product is continuously fed into the centre of the top screen, from where it spreads out evenly to the outside across the entire screening surface. While the finer particles fall through the screen near the centre, the coarser ones successively towards the periphery. All the material is moved in a spiral pattern with increasing acceleration of the particles the further they are from the centre, with the result that even those particles which are almost the same size as the screen mesh are screened. The separated fractions are discharged through the lateral outlets and screening process is repeated continuosly on each deck while the main shaft is driven by V-belts and an electric motor. Using a special axially spring-mounted graphic recorder, this 3D movement of the machine can be drawn on paper two dimensionally in the form of an ellipse and then measured exactly. Measured data can be transmitted at any time for further checking. In this way, optimum settings will always be available and reproducible in the future, too. In particular with fine products, the screen mesh openings tend to clog up and it is imperative that this be avoided if continuous operation is to be guaranteed. Various very effective screen cleaners are available for this purpose. The modular design enables different setup variations and product can be re-screened 2 to 3 times to increase yield and screening efficiency.

Features and plus:

• extremely high screening efficiency (up to 99%);
• easy dismantling and cleaning of all parts;
• low noise level (<78dB);
• reduced maintenance cost;
• modular design for double screening or high capacity;
• low acceleration and gentle separation of the product;
• not destroy fragile and delicate products;
• possibility to install lifting device for quick screen frame change;
• available with ATEX certi­fication, FDA IQ-OQ, GMP procedures;
• available Jacob fittings and fi­nishes for the food and pharmaceutical industry.