Palletizing

Automated palletizing and depalletizing are critical upstream and end-of-line operations in a wide variety of industries, including:

What are Palletizing And Depalletizing?

Two of the most common processes in material handling are palletizing – stacking boxes, cases, or finished product onto a shipping pallet for safe transportation, and depalletizing – removing items from a shipping pallet, sometimes referred to as singulation or decanting. Compared to having an operator complete these functions, palletizing and depalletizing are areas where automation can make a positive impact on the bottom line by offering significant cost savings while protecting operators from potential repetitive motion injuries.

Palletizing, Depalletizing and Decanting Terminology Defined >

With nearly two decades of successfully completed robotic material handling projects under our belt, AMT has developed a methodical checklist for evaluating the unique parameters of each project to design the most cost-effective and efficient automated solution for our customers.

Download: 10 Key Considerations for Palletizing / Depalletizing >

Introduction to Palletizing >

Robotic and Automation Integration

Palletizing and depalletizing equipment is often integrated with upstream and downstream processes such as these:

For palletizing

For depalletizing

Although palletizing and depalletizing are most often conducted with boxes, specialty equipment can be designed to handle other loads such as bags, trays, cases, sheets, totes, and pails (think of sand, rice, or pet food).

A full-service system integrator will use a holistic approach to the design of robotic systems, and make recommendations to ensure the entire process meets the client’s production and business goals. To ensure the design of a robust automated system, a detailed process analysis must first be conducted, laying out the upstream and downstream processes to handshake with. Various technologies are employed to complete the required palletizing or depalletizing task, most often including robotics and vision systems. Often the scope is changed to include adjacent operations and their respective equipment to avoid creating new bottlenecks at interfaces. This full scale evaluation can be the difference in implementation of automation to create value for production systems.

Product Challenges

Several of the items in our 10 Tips for Palletizing download relate to product-specific characteristics that can make palletizing a challenge, such as the product’s weight, porosity, center of gravity, and deflection when lifted. These traits greatly affect the design of the material handling equipment’s end-of-arm tooling (EOAT). This is further complicated by systems that need to incorporate a variety of packages with ranges of size and shape. Any parameters that fluctuate or are not predictable present challenges for automation to handle. 

Design of product handling devices must account for all ranges of product characteristics that are meant to be processed through a system. From the beginning stages of concept, automation design has to plan to adapt within these specifications and how to handle unexpected results. The basis of this design will direct the controls programming needs in order to manage the product presentation to automation. The limitations of equipment capability also need to be documented in the process operation information for future reference.

Revamped HMI Provides Better Process Control for Material Handling System >

Process Challenges

Some manufacturing processes are completely unique and their automated systems require adaptability to meet production requirements. AMT has successfully engineered many such systems, each customized to meet the particular needs of the manufacturing situation following a thorough process analysis. A wide variety of technologies can be employed to efficiently and creatively assist the client in meeting their manufacturing goals, such as robotics and smart, flexible 2D/3D vision technology.

Investment in automation can provide flexibility for now and in the future. For palletizing operations we want to be able to adjust to changes in upstream and downstream processes. Technology can be used to play a role in part identification, tracking and other management tasks that help systems adapt, including equipment like RFID, barcode scanning, and vision systems. Smart system programming can make decisions on how to handle product and support operations like multi-lane tending, mixed product sortation, and pattern strategy.

One of those projects was taking heavy cases of product from multiple production lines and sorting them by customer then by product and building pallets to ship to a customer to fulfill specific orders. One robot handles from one to several packages at a time, stacking them in a specific pattern on the pallet until it is full, known as row and layer forming. The full pallet goes through a stretch-wrapping operation and then moves out to shipping docks to be sent to the customer.

Fiberglass Manufacture Line Automation Upgrade >

Next Generation of Systems: Decanting and Mixed-Load Depalletizing

In addition to projects that handle one or two types of products, AMT is involved with leading-edge development of the next generation of material handling systems. The newest systems are designed to solve limitations which have a difficult time handling multiple types of product on one system. Currently, the process of mixed-load palletizing – efficiently loading boxes of different sizes, shapes and weights onto shipping pallets – is fraught with difficulties. Many manufacturers currently use human operators for this function, which can be hard on the operators (ergonomics) and on the company’s bottom line. With upstream automation in place in many facilities, the speed at which pallets must be loaded may require the use of what seems like an army of operators.

When designing palletizing automation for larger warehouse operations, there can be thousands of stacking combinations based on the size of the product. These projects require expert-level programming of the equipment’s control system due to the large variation in the ways the robot is interacting with the product. Using pre-programmed algorithms, the robot will build interweaving patterns layer by layer (layer forming) to create pallet stability and most efficiently stack the product for shipment.

Mixed-load depalletizing – unloading boxes of different sizes, shapes and weights – also has inherent challenges. The many different items on the pallet may need to be sorted and distributed to separate locations, and there are complicated decisions to be made that could be a struggle for an operator, especially if the line is running at high speed. Adding robotic depalletizing equipment to a facility such as this can often have a quick return on investment (ROI).

Material handling solutions which include palletizing and depalletizing can be complicated, but when thoughtfully designed and installed can provide a quick ROI and a reduction in risk. Please contact AMT for more information or to discuss your project.