Conveyors are designed to move (convey) product and other materials from one process to another. They can also be used to support the product or container while the product and container processing occurs. Conveyors can use different methods to convey products and materials. Conveyors for stable solid products or packages can use belts, rollers, side belts, or interlocking plastic plates, know as tabletop (Delron), to convey products. Side belt transfer conveyors are a special classification of conveyor for stable solid products. Side belt transfer conveyors use gripper belts that grip the side of the container to convey a container, thus leaving the bottom of the container exposed. Side belt transfer conveyors are often used during the coding or labeling of the bottom of the container. Laner conveyors or laning conveyors are used to transfer containers from one lane to multiple lanes or from multiple lanes to one lane. Laner conveyors are often used in conjunction with tabletop or roller conveyors.Screw conveyors are designed to conveyor powder. A large screw rotates within the product in a screw conveyor and the product moves forward with each progressive revolution of the screw. Vibratory conveyors use the vibrating action of a vibratory pan to move product forward. A bucket elevator is designed with buckets that raise free-flowing product, either powder or small solids, to a given height above the floor. The product is held in the buckets and once at the given height, the buckets are overturned and the product is dumped out of the buckets.