Plastic granules are typically stored in small casks (sack ware), large casks (octabins) or in silos. For storage of larger tonnages of plastic, silos made from stainless steel or aluminum are used. Due to their size, silos are usually erected outside of production areas. From there, the silos are connected to the granulate conveying system of the production plant. The conveyor system first forwards the material from the silo to a central drying system before it is fed to the injection molding machines.