iAs with the vast majority of industrial steel storage rack systems, each last-in/first-out (LIFO) pushback racking system’s design accommodates specific pallet types, loads and rack configurations. Operator training, therefore, should emphasize only loading a pushback system with pallets approved for use within the structure. Using pallets with different dimensions or construction styles can increase the risk of the load not sitting securely on the cart within its lane.
How Pushback Rack Works
Pushback rack systems utilize the pallet loads themselves to push each load and its cart backwards into the lane with the addition of each new pallet. That means both pallet and load integrity are essential to the proper functioning of the rack. Damaged pallets or those with broken, split or cracked bottom boards, or exposed fasteners can cause a load to become snagged or hung up within its lane. Improperly unitized loads or those lacking stretch wrapped to secure the contents can also become caught up in the system. A pallet load with overhanging slip sheets, carton flaps, loose stretch wrap, improperly stacked cartons, or boxes that have been jarred out of position can snag easily within the system, causing a jam.
Design Leverages Friction
Such a situation can negatively impact the system’s safety, structural integrity and smooth operation because of fundamental pushback rack design. Engineers design these systems to leverage a combination of friction between the pallets and their loads, the pushback carts and rails, and any physical skid stops and/or beam stops that keep pallets in place. Any debris or obstruction from a pallet, or the presence of a foreign material — such as ice, lubricants or liquid — on the pushback rails or carts can potentially reduce the friction between the pallet and the pushback system. The loss of friction can result in the pallets sliding forward. Therefore, to maintain the integrity of each lane, perform periodic inspection of the rails and the carts and clean as needed.
Never Mix Load Weights in a Lane
Additionally, it is important to never mix load weights within a single lane of pushback rack. Because different pallet weights generate different degrees of friction within the lane, mixed loads can increase the potential for a heavier pallet to push a lighter one out of alignment or out of the system entirely. This is a dangerous situation that increases the risk of system failure, product damage or injury to personnel.
Learn more about how to safely use pushback rack systems, here.
