technology
Haver & Boecker
If a vibrating screen continues to operate while having issues with pegging, blinding, broken screens or screen media with incorrectly sized openings, the screened pile will likely be contaminated and might require rescreening.
polyurethane on the top layer and more rigid polyurethane on the bottom layer. This combination works well for hard-hitting applications requiring openings greater than 5cm and, especially when used with tapered openings, helps eliminate pegging and blinding by allowing larger particles to better screen or reject near-sized particles.
Some screen media manufacturers address high-impact applications and improve wear life by supplying screens with solid areas to withstand the heaviest of materials. Engineered media’ s versatility addresses not only the material’ s composition, but also its temperature. Manufacturers can create polyurethane products to withstand high-heat applications, such as when screening silica after running it through a drying drum. Operators can also ask for additionally customised screen media for unique and challenging applications.
A lot to choose from
Manufacturers create engineered screen media out of several different types of material, such as polyurethane, rubber, and perforated plates. Polyurethane offers a long lifespan and durability. Look for a polyurethane screen media manufacturer who blends their own material and who pours their polyurethane opencast rather than injection moulded. The opencast process takes about 9 hours to complete and typically lasts about 1.5 to two times longer than injection-moulded products. In addition, opencast polyurethane permanently hardens when cured to maintain its chemical properties, so it resists wear and tear. Injection-moulded screens, though faster to manufacture, can soften when the temperature rises during screening, resulting in less wear life.
Haver & Boecker
Steve Fair, Tyler engineered media manager at Haver & Boecker.
Kivagrupp
Manufacturers can create rubber screens thicker than polyurethane for improved durability and reduced noise, and to handle highimpact applications and resist abrasion. Weir Minerals Linatex rubber and polyurethane screens, for example, can be used on a wide range of processing plants.
Advanced Engineering Group
Many mining and aggregates operations have long used traditional products like woven wire cloth for screens, such as that manufactured by Advanced Engineering Group, with great results.
QUARRY SA | march 2017 _ 31