A conveyorbelt consists of two or more pulleys, with a continuous loop of material – the conveyorbelt – that rotates around them. One or both of the pulleys are powered, moving the belt and the material on the belt forward. The powered pulley is called the drive pulley, while the underpowered pulley is called the idler.
There are two main industrial classes of beltconveyors: those for general material handling for moving boxes forward inside a factory and for bulk material handling to transport industrial and agricultural materials such as grain, coal, ores, fines and lumps of material.
Currently there are different types of conveyorbelts available in PVC and rubber materials that have been created for conveying different kinds of material. The belt consists of one of more layers of material. They can be made from rubber and many belts in general material handling have two layers. A bottom layer of material to provide linear strength and shape (called a carcass) and a top layer (called the cover). The carcass is often woven fabric having a warp and a weft. The most common carcass materials are polyester, nylon and cotton. The top is often various rubber or plastic compounds specified by the use of the belt. For unusual applications when traction is essential, covers can be made from exotic materials such as silicon or gum rubber for heater.