Screening machines, in particular flip flow screening machines, for the separation of adipic acid, anthracite being hard coal, basalt, bentonite, biomass, blast furnace slag, ceramics, chrome ore, clay, clay granulate, coal, coke, compost, construction and demolition waste, dolomite, electronic scrap, feldspar, fertilizer, flat glass, flour, food, gneiss, gold ore, granite, granulate, gravel, greywacke, gritstone, gypsum, hard coal, hollow glass, iron ore, laminated glass, lava stone, lignite...