Handling completed orders within a tote or a shipping container can reduce the amount of manual handling required to fully process shipments. A reduction in manual handling also has the ability to reduce the total order cycle time from the point it is dropped through shipping on the outbound truck. The removal of human intervention also reduces the likelihood that a parcel or pallet can get placed on an incorrect trailer. For this reason, many warehouses choose to implement case sorters such as paddle sorters, tilt tray sorters, and other conveyor-based sortation systems. Below is a list of some of the most common case sorters.
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Types of Case Sortation
1. Narrow Belt Sorter – NBS (NBS-90 and NBS-30)
The Narrow Belt Sorter (NBS) uses a set of narrow strip belts to carry product over the surface of the sorter. The NBS contains an individual takeup for each belt in the system. At the divert location on the 90 degree divert bucket a series of high friction rollers raise to engage the product and divert it off of the sorter at a right angle. On the 30 degree version, fixed angle wheels rise up between the carrying strip belts and divert product off the sorter.
2. Pusher Sorter
A pusher sorter as the name implies uses a device to “push” product off of the sortation line. These pushers are usually constructed using an air actuated cylinder with a block mounted across its face. The cylinder extends out until the desired length is detected (usually via a reed switch at a fixed point) and makes contact with the item traveling across its face, thus diverting it off of the main line.
Several pushers can be mounted along a belt conveyor to increase the number of sorter points, which makes this an extremely economical sortation method, especially when a minimal number of sorter points are required. Pusher sorters were some of the very first sortation devices put into service in the 1950’s.
3. Paddle Sorter, BAT Sorter, Flat Face Divert Sorter
A paddle sorter (or BAT sorter), as the name implies, uses a paddle to shunt product off of the sortation line in a similar fashion to a bat being swung by a hitter. The paddles are constructed with an air actuated cylinder with a flat face. The cylinder extends in such a way that the furthest downstream side of the face extends out at an angle, allowing the sorted item to be guided along the angle established by the paddle’s face. Also, by coming into contact with the item being sorted, the package is diverted.
4. Pop-Up Wheel Sorter
A pop-up wheel sorter is a series of buckets installed along a belt conveyor where the belt is serpentined through the divert bucket. The unique pop-up nature of this system allows for only one drive to be used as the product is conveyed over the buckets via carrying bands. As a product is tracked and reaches the precise divert location, fixed position divert wheels pop up and redirect the product off of the pop-up wheel sorter.
The divert bucket itself consists of multiple rows of wheels that will pop-up in a fixed orientation. These buckets can be replaced in a matter of minutes if service is required. The modular design allows for one to be removed and a new one swapped in quickly..
5. NBS Wave Sorter
The Narrow Belt Wave Sorter uses a set of narrow strip belts to carry product over the surface of the sorter. The magic of this system is the “wave” of individual rows of wheels. Five rows of wheels cascade in such a way that the first row drops, followed by each additional row continuing in the directional flow. This requires a reduced gap amount on the machine and results in a higher overall throughput in terms of product feet vs. gap, or air required on machines that have a higher gap requirement between cartons.
6. Sliding Shoe Sorter
A sliding shoe sorter is a highly accurate option for sorting products of many different shapes, sizes, and weights. Shoe sorters have the ability to sort products at a high rate without causing any damage to the product. The rate at which it can sort will depend on the size and weight of the product itself. The range for the rate may be from 20 products per minute to hundreds of products per minute.
In order for a shoe sorter to operate, slats are attached to the conveyor and used to carry the product through the system. Shoes are attached to one side of the slats while diverts are on the opposite side. As products are carried along the conveyor path toward their specified divert location, multiple shoes will gently divert the product in a diagonal direction from the slat conveyor onto the correct lane. The diagonal motion of multiple shoes is used to avoid damaging the product.
7. Bombay Sorter
A Bombay Sorter, also known as a flat sorter, is used for high speed automated sortation of lightweight items that are too small to be handled by a typical conveyor system. This includes items such as bagged garments, jewelry, pharmaceuticals, CDs, mail, books, and small parcels. Bombay Sorters are usually found in distribution centers that do a lot of direct-to-consumer operations. The Bombay Sorter handles similar items and operates in the same way that a tilt tray or crossbelt sorter would. They typically have hundreds of sort locations making the Bombay Sorters rather long. However, they do make good use of space with sort location, with placement being as close as 18” center to center.
These sorters can be engineered to have curves and designed to fit tight warehouse spaces. On all three of these sorters, the item being sorted can either have an operator manually place items on the sorter or have an automated induction system that handles getting the items on the sorter. Once the items are on the sorter they are then scanned and assigned a location. Unlike the Tilt Tray Sorter and the Crossbelt Sorter, the Bombay Sorter items fall through a trapdoor to arrive at their sorted location, hence the name. The items can be sorted into a chute for further processing or dropped directly into a carton or tote ready to ship to the customer.
8. Crossbelt Sorter
The Crossbelt or Loop Sorter is a chain of many short belt conveyors riding on a track that is on a continuous loop. Every single belt carries one item to be sorted. When the item is ready to be discharged the belt will run across the flow of the loop and divert the item to either side of the system. This configuration makes the Crossbelt Sorter a highly efficient mechanism, requiring minimal space for high volume item sortation.
Crossbelt sortation conveyors can be fed by automated induction stations, or by operators manually. Scanners match an item barcode to a belt section and track the item to the correct destination. These sorters often feed customizable chutes that allow a single divert location to create multiple orders. Crossbelt Sorters are most effective when used following a wave pick or batch pick operation.
This particular sortation can be designed in 2 different configurations: Horizontal Sortation, which is circular, and Vertical Sortation, which is in a linear format. These conveyors are the RightFIT solution for operations that require a higher volume of throughput, a wide range of product shapes and sizes, or have narrow footprints and many different processing stations. This technology has been widely used in many industries including grocery, apparel, and e-commerce.
9. Tilt Tray Sorter
A Tilt Tray Sorter is a specific type of continuous loop sorter, which is a highly accurate, high-speed method of sortation. A continuous loop sorter consists of a rail or track configured in an endless loop where individual carriages ride at speeds of up to 590 feet per minute. The carriages are connected together to form a chain, which is used to drive them along the track. The Tilt Tray Sorter is unique in that each carriage is topped by a tray, commonly made of wood or plastic, that can be individually actuated to tilt to either one or both sides. The item on the tray is then deposited by gravity onto either a chute or a takeaway conveyor.
Items to be sorted can be manually deposited onto the trays by personnel, automatically inducted onto the trays by an induction conveyor, or a combination of the two methods. Regardless of which method is used, the item placed onto the tray is tracked by controls software and transferred to its correct location. This arrangement allows for sortation of up to 40,000 items per hour.
Tilt Tray sorters are very versatile in that they can be used with virtually any type of packaging including cartons, bags, totes, and more. Whether the item being transferred is very small or oddly shaped, if it fits on the tray, it can be sorted efficiently.
In comparison with other sortation technologies, a Tilt Tray sorter can be easily reconfigured or expanded with minimal difficulty. This technology has been widely and successfully used in many different industries, including apparel, postal, publishing, and pharmaceutical.
10. Hi-Tilt-Bot Crossbelt and Tilt Tray Sortation AMR
Autonomous Mobile Robots (AMRs) have the ability to provide case sortation, but in a very flexible manner. The AMRs come in both tilt tray and crossbelt models. Induction can be done using an operator, robotic arms, conveyor feed and more. An item is placed on top of the AMR and the above mounted camera reads the barcode. The bot immediately travels via the shortest path to its destination. The destination can be a gaylord, bin, conveyor transfer, robotic arms, and more.
Part of the beauty of this system is the lack of infrastructure required to create this system. Induction stations are simple with a monitor and camera mounted on a stand above. You then have the floor and destination points around the perimeter or spaced in aisles on the floor.
Flexibility and agility is second to none. This can be used as a temporary for peak, a safety valve to reduce congestion on primary conveyor sorters, and a primary sortation system. The size can be increased or decreased incrementally in a day or over a weekend. Additional AMR bots can be leased for peak periods reducing your OPEX expenditure.
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Conveyco has also designed and implemented custom solutions for clients, including sliding shoe, unit, and other high-speed sortation systems for over three decades. Learn more about our design build process, or request a complimentary consultation today.