Osborn Apron Feeder | Osborn South Africa. Our Apron Feeders are designed and built in a wide range of sizes from 900 mm to 3500 mm wide to handle heavy, lumpy and abrasive materials, and provide a reliable means of controlling the feed rate to prevent surge loads to primary crushers, belt conveyors and other plant and equipment Apron Feeders are usually installed under a hopper or bin and can ...