A Belt Conveyor is a system of pulleys with a long loop of fabric or other material stretched between them. They are used to conveniently move heavy objects from one part of a processing facility to another. Belt Conveyor can be extremely complex or quite simple.
The belt provides a continuous surface on which to place boxes or other objects. The inside of the belt is rough and strong, so as to stand up to the wear and tear of being pulled along by motorized wheels. The outer layer, which is the layer that workers use to convey materials, is usually softer and more impact resistant. It is common to treat it with some sort of non-skid surface, since there is no reason to take a chance that objects might bounce off if placed roughly or fall off if the conveyor has to take a turn. Rubber and plastic are both used for the belt material.