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How to increase storage capacity and warehouse productivity


Compact storage systems feature a higher storage density by optimizing available warehouse space. Of all these, the Pallet Shuttle system is the one that best enhances an installation’s productivity because an electric shuttle moves goods through the channel automatically. The combined benefits of compactness and automation make the Pallet Shuttle system the ideal solution for companies that need to maximize storage capacity while also increasing productivity.

Compaction systems maximise space for more pallets to house more pallets

Businesses today face many logistical challenges. Having more storage capacity in a limited area is one of the most difficult issues to tackle.

To this end, it is standard practice to install these space-saving compaction storage systems because they maximize room and, therefore, fit a larger number of pallets.

These high-density systems include traditional solutions (drive-in, push-back, flow or semi-automatic Pallet Shuttle racking) and automated solutions (Pallet Shuttle system with stacker cranes or transfer cars). Each of them has its own unique features, advantages and applications, although they share some common traits:

  • They utilize the warehouse area by reducing the number of aisles and, as a result, achieve greater storage capacity.
  • They are often used for storing multiple pallets of the same SKU.
  • Each lane (in the drive-in racks) or each level of a lane (in the push-back, flow and Pallet Shuttle racks) is assigned the same SKU.
  • They only give direct access to the pallet that coincides with the working aisle.
  • In traditional solutions, counterbalanced forklifts and reach trucks are used to handle goods.

Traditional compact system vs the semi-automatic Pallet Shuttle

When choosing which compact storage system to install in the warehouse, one must assess not only the storage capacity, but also the flows, the number of available SKUs and the company’s logistics requirements. Each system has specific characteristics that must be understood if you want the right solution to solve a problem in a particular warehouse and to get the most out of the chosen solution.

The following are distinguishing features of each of the traditional compact systems:

Drive-in Drive-thru Pallet Racks: high-density at a low cost
They are made of a set of racks that have storage lanes inside. In turn, these lanes are equipped with rails to support the pallets. Operators drive forklift trucks to store or extract pallets from the racking. These machines move along the inner storage lanes with the load lifted above the level on which it will be stored.

Their lower cost, space savings and almost non-existent maintenance make drive-in pallet racks the most cost-effective option for compact systems.

Push Back Racking Systems: for average consumption products (type B)
They are set with a slight gradient. The front side is lower so that, by taking a pallet out, those behind it slide through gravity down to the first exit point position. With this system, goods are managed according to the LIFO (last in, first out) principle, i.e., the last pallet to enter is the first to leave. Thus, the operators deposit or extract the goods from a single working aisle.

Unlike drive-in racking, with push-back racks, the forklift does not enter the storage lanes, as both pallet loading and unloading are done from the working aisle. By doing so, handling times are much shorter. It is a system that holds more SKUs than drive-in racks, as each storage channel can contain a different SKU.

Pallet flow racks: ideal for perishable products
Channels are fitted with rollers and speed controllers. With this system, there are no aisles to access the goods, as the loading and unloading aisles are sufficient to get the job done.

It is the only compact system that ensures the flawless rotation of the goods because it meets the FIFO (first in, first out) method requirements: the pallets are inserted on the highest side of the racks and slide by gravity to the opposite end. Therefore, it is highly suited for storing perishable products or products with short expiration dates that require high turnovers.

Semi-automatic Pallet Shuttle: capacity and productivity
The Pallet Shuttle is a semi-automated high-density storage system in which a shuttle with an electric motor runs along rails within the storage channels in order to load and unload the goods.

This system works in a very straight-forward way: using a forklift, the operators insert the motorized shuttle into the channel in which the goods are to be stored. The Pallet Shuttle moves the pallets to the deepest available position or, vice versa, picks up the first pallet found in the channel and moves it to the exit.

Compact storage systems reduce the number of aisles in benefit of a better use of space and, therefore, more storage capacity

What are the benefits of the semi-automatic Pallet Shuttle system?

  • Optimum use of space. Storage channels can be more than 131' deep.
  • Increased productivity. The pallets move fully automated, increasing the flow of goods in and out of the warehouse.
  • Reduced spending. It is highly cost-effective, thanks to the lower operating costs. Furthermore, well used space equals less floor surface costs.
  • Versatility. It is a system that adapts to the dimensions of the warehouses. It can also be combined with other storage solutions.
  • Maximum safety. Since it is not necessary to drive forklifts into the lanes, the risk of accidents is almost non-existent, so the metal structures remain undamaged.

Warehouse layout with a semi-automatic Pallet Shuttle system

Racking block distribution with the semi-automatic Pallet Shuttle has a direct effect on storage capacity. It also influences the way in which goods are managed and, consequently, the speed products enter and leave.

Interlake Mecalux searches for the solution that best adapts to each customer’s specific needs, which will vary depending on the number of SKUs, the quantity of pallets and how the goods are received and dispatched.

1. A single front aisle

  • Greater storage capacity.
  • High number of locations.
  • LIFO merchandise management.

2. Two access aisles: one for inputs and one for outputs

  • Less storage capacity than using a single aisle.
  • High number of locations.
  • FIFO merchandise management.

3. A working aisle and racks on both sides

  • Increased number of locations compared to previous solutions.
  • Shallower channels.
  • LIFO merchandise management.

The Pallet Shuttle system is usually installed in:

  • Companies with a large number of pallets per SKU.
  • Cold stores. There is less volume that must be refrigerated since it is a compact storage system and, as such, there is reduced power consumption.
  • Temporary storage buffer.
  • Seasonal product warehouses, or warehouses with season-based inflows and outflows.
  • Warehouses that already use a high-density system and want to increase productivity by shortening loading and unloading times.

Nestlé Purina
How to deal with a large work volume

Pet food company Nestlé Purina has equipped its distribution center in Chile with three blocks of compact racks with the Pallet Shuttle system, offering a total storage capacity for more than 7,000 pallets.

The priority of this company was to enhance order preparation. For this reason, two picking tunnels have been arranged on the lower level of the pallet rack blocks.

In this way, the higher levels (managed by the Pallet Shuttle) store the reserve products.

Thanks to this design and racks’ versatility, Nestlé Purina always has goods to prepare all its orders seamlessly.

Moreover, the electric shuttle speeds up the input and output of a large volume of pallets, which is essential for managing the arrival of 300 pallets and the dispatch of another 400 daily. 

Héctor Olmos
Warehouse Manager of Nestlé Purina in Chile

“The advantage of this system is that reserve palletized stock is kept in the same channel, which is why there is always the products needed for picking. We chose this system because it improves storage density and because it is highly flexible.”


When and how to automate a compact storage system
Automation increases warehouse output


Companies with compact systems that want to increase their logistics center's productivity may consider fully automating their operations by replacing a forklift with automated handling equipment.

This system can be automated by introducing stacker cranes or transfer cars. Choosing between one piece of handling equipment or another will depend on the required number of inbound and outbound movements, the number of SKUs and the number of pallets per SKU or batch.

Stacker cranes. These are responsible for moving pallets from the warehouse inflow-outflow positions to any storage channel. Once there, the Pallet Shuttle transports them from the stacker crane’s cradle to the interior of the channel.

Transfer cars. A walkway structure is installed so that a shuttle moves through each level. This transfer car carries out the movements from the pallet lifts to the storage channels on each level. Thus, the number of movements or cycles/hour is multiplied by the number of levels in a warehouse.

The automatic Pallet Shuttle system is recommended in the following cases:

  • Installations where very high yields are required, with a high product rotation and where maximum use of space is essential.
  • Companies with massive stock counts, with medium and high consumption SKUs, or with a large number of pallets per SKUs.
  • Cold stores.
  • Temporary storage buffer.

Compaction and automation

The Interlake Mecalux Pallet Shuttle system, in both its semi-automatic and automatic versions, is the best solution for companies whose priority is to increase the capacity and productivity of their warehouse while also reducing operational costs.

In short, the Pallet Shuttle is the evolution of the compact storage systems, providing greater storage capacity, speed and productivity.

Its capabilities add value to the company’s logistics activity and, at the same time, compensate for the initial investment with a short-term cost reduction and a rapid ROI.

Bem Brasil
All-around freezer control

Bem Brasil, a food company that produces more than 112,000 tons of pre-cooked frozen fries every year, has equipped its distribution center located in the Brazilian city of Araxá with a rack-supported warehouse. This system stands more than 82' high and is managed by the automatic Pallet Shuttle system. With a capacity of more than 33,000 pallets, Bem Brasil houses both the raw materials used in the production processes and the finished products in its new intelligent warehouse. Besides a high storage capacity, the automation provides fast entry and exit of goods. The chamber works at a steady -22 ºF to guarantee the goods are perfectly preserved.

João Emílio Rocheto
Chairman & President at Bem Brasil

“The automatic Pallet Shuttle system is a solution that is compact, practical, fast and flexible. Its robotized operations have helped us cut power costs and consumption, improve work conditions for employees and increase handling efficiency and conservation of our goods.”