Sortation machines can be put into three categories: maintained orientation line sorting, right angle line sorting, and loop sortation. Maintained orientation machines keep the object being sorted in the same orientation; if a box is going down the line lengthwise, it will continue to go down the line lengthwise after sorting. Right angle line sorting changes the orientation of the product, which can save space for storage. Loop sortation machines have a continuous loop that deposits products by tipping them off trays or rolling them off belts. Some conveyors have more than one belt on them which creates different lanes. Transfer conveyors create a smooth way to transfer products onto other conveyors to prevent damage.