Cartons and multipacks often require careful grouping before they enter a shipping case. Their rectangular shapes make them suitable for automated packing, but differences in dimensions, weight, orientation, and pack count still require accurate product handling.
A wrap around case packer handles cartons and multipacks by organizing them into a defined pattern and forming corrugated material around the grouped products. The process combines product collation, case blank feeding, folding, compression, and sealing into a coordinated packaging cycle.
Why Cartons and Multipacks Need Accurate Case Packing
Cartons and multipacks often move through production lines at high speeds. Small variations in product spacing or orientation can create problems when the products reach the case forming section.
Consistent grouping helps the machine create cases with predictable dimensions. It also reduces unnecessary movement inside the finished package during transportation.
How Cartons Enter the Packing Line
The process typically begins with cartons or multipacks arriving on an infeed conveyor.
The conveyor controls product movement and directs the items toward the collation section. Guides and sensors may help maintain spacing and prevent products from entering the next stage in an incorrect position.
The handling method depends on the product’s dimensions and the required production speed.
Product Collation Comes First
Before case formation starts, the machine needs to create the required product group.
For example, a case may contain six large cartons arranged in two rows of three. Another application may require 12 smaller multipacks arranged in several rows.
The collation system creates the selected pattern before transferring the group toward the corrugated blank.
Handling Cartons in Different Orientations
Cartons may travel upright, on their sides, or in another orientation depending on the product and packaging requirements.
The machine needs to maintain the intended orientation throughout collation and transfer. Guides, belts, pushers, and timing mechanisms help control carton movement.
A stable orientation gives the case forming system a predictable product group to work with.
How Multipacks Differ From Individual Cartons
Multipacks already contain several individual products within one outer package. Their larger size and combined weight can affect how the machine handles them.
The system needs to move each multipack without damaging its outer packaging. It also needs to create a case pattern that uses the available space efficiently.
The dimensions of the multipack determine how many units fit into each shipping case.
Creating the Required Case Pattern
Once cartons or multipacks reach the grouping area, the machine arranges them according to the case specification.
The pattern may involve:
- Single or multiple rows
- Different product orientations
- Multiple product layers
- Compact side-by-side arrangements
- Mixed configurations for specific applications
The chosen pattern needs to remain stable during transfer into the case forming section.
Feeding the Corrugated Blank
The case starts as a flat corrugated blank stored in the machine’s blank magazine.
A feeding mechanism retrieves the blank and positions it at the correct point in the packaging cycle. The dimensions and crease pattern of the blank correspond to the intended finished case.
Accurate blank positioning helps the machine fold the cardboard around the carton or multipack group correctly.
How the Case Forms Around Cartons
The grouped products move into position relative to the corrugated blank.
Folding mechanisms then bend the blank around the product group. Side panels, bottom sections, and top flaps fold according to the case design.
The machine controls the folding sequence so the cardboard reaches the intended shape without disrupting the products inside.
Sealing the Finished Case
Once the cardboard surrounds the cartons or multipacks, the machine completes the closure.
Adhesive may secure the appropriate flaps and create a closed shipping case. Compression components can help maintain contact while the adhesive sets.
A consistent sealing process helps finished cases withstand conveyor movement and normal distribution handling.
Managing Different Carton Sizes
Manufacturers may need to pack several carton sizes on the same production line.
Different sizes can require changes to product guides, grouping patterns, case dimensions, and machine settings. The machine needs sufficient adjustment capability to accommodate the required formats.
Production facilities with frequent size changes should pay particular attention to changeover time when evaluating equipment.
What Happens With Lightweight Cartons?
Lightweight cartons may shift more easily when conveyors accelerate or stop.
The packaging line needs controlled product movement to prevent cartons from sliding, rotating, or colliding during collation.
Proper guide positioning and conveyor speed help maintain the desired arrangement without applying unnecessary pressure to the products.
Handling Heavier Multipacks
Heavy multipacks place greater demands on conveyors and transfer mechanisms.
The system needs sufficient traction and mechanical capacity to move the products consistently. Excessive acceleration can also cause products to shift or collide with other equipment.
Manufacturers should consider multipack weight when selecting conveyors, grouping equipment, and case packing machinery.
How Case Dimensions Affect Carton Packing
Case dimensions need to match the complete product group rather than one carton.
The machine must account for product length, width, height, quantity, and arrangement. Corrugated board thickness and the selected case style also influence the final design.
A case that leaves too much empty space may allow products to move, while an excessively tight case can interfere with reliable packing.
Why Product Stability Matters
Cartons and multipacks should remain stable from collation through case formation.
Stable groups help the corrugated blank fold consistently around the products. They also reduce the likelihood of uneven cases or sealing problems.
Product stability becomes even more important when cases need to withstand stacking or long-distance transportation.
How Automation Improves Carton and Multipack Packing
Automated systems coordinate multiple movements within each packaging cycle.
Sensors monitor product positions while controls synchronize conveyors, grouping mechanisms, blank feeding, folding, and sealing. This coordination allows the machine to repeat the same process with consistent timing.
Automation also reduces the amount of repetitive manual product handling required on the production floor.
Common Problems When Packing Cartons and Multipacks
Several issues can affect automated case packing performance.
Typical challenges include:
- Cartons entering with inconsistent spacing
- Multipacks shifting during transfer
- Incorrect product counts
- Case blanks feeding out of position
- Product groups losing their intended pattern
- Poor flap alignment
- Inconsistent adhesive application
- Excessive case movement after sealing
Many of these problems relate to product handling, machine setup, or mismatched packaging specifications.
How Can Manufacturers Improve the Process?
Manufacturers should begin by documenting the products and cases they need to run.
Useful information includes carton dimensions, multipack dimensions, product weight, case count, desired arrangement, corrugated board specifications, production rate, and expected changeovers.
Testing the actual products with the proposed packaging configuration can reveal handling issues before full production begins.
What Should You Consider When Selecting Equipment?
The machine should support the current product range while leaving enough flexibility for expected future requirements.
Key considerations include:
- Product dimensions and weight
- Carton and multipack configurations
- Required cases per minute
- Case dimensions
- Corrugated blank specifications
- Changeover requirements
- Available floor space
- Upstream and downstream equipment
- Maintenance access
- Operator requirements
Looking at these factors together provides a more realistic picture of how the equipment will perform in the production environment.
Techflow Pack and Automated Case Packing
Techflow Pack provides packaging machinery for manufacturers that need automated solutions for different case packing applications. Carton and multipack projects require equipment configured around the specific product and case requirements.
When planning an automated system, manufacturers should provide product samples or detailed specifications along with the desired case formats. Techflow Pack can then evaluate factors such as product grouping, case dimensions, packaging material, and production targets.
Final Thoughts
Cartons and multipacks can move through automated case packing systems efficiently when product grouping, case dimensions, and machine movements work together. The process starts with controlled infeed and collation before moving into corrugated blank positioning, folding, and sealing.
The best packaging setup depends on the product format, case pattern, production volume, and handling requirements. Careful testing and equipment selection can help manufacturers achieve consistent case quality while reducing repetitive manual packing work.