The core idea of this page: a palletizer stacks cases onto a pallet in a stable, shippable pattern — and the choice between conventional (layer) and robotic palletizing is a speed-versus-flexibility trade-off. Layer palletizers build a whole layer at a time for high volume; robotic palletizers place one case at a time for mixed SKUs and tight spaces.
For the machine shortlist, see Top 10 End-of-Line Machines Compared.
How a palletizer works
Conventional (layer) palletizing
A layer palletizer collates cases into a full layer, then places the layer on the pallet. Because it moves a whole layer at once, it reaches the highest throughput — the Möllers PLS-C runs 1,200–3,000 bags/hour and the Krones Modulpal Pro up to 650 layers/hour.
Robotic palletizing
A robotic palletizer uses an articulated arm with a gripper to place cases one or a few at a time. It is slower per case but far more flexible — one arm can handle multiple case sizes and pallet patterns with a program change instead of a mechanical change.
Pallet pattern and load stability
The pattern (the interlocking grid of cases) and the interlayer (slip sheets or glue) decide whether the load survives transport. A stable pattern distributes weight and interlocks cases so the pallet does not collapse or shift.
Failure modes to design around
- Unstable pallet patterns. A poorly interlocked pattern shifts in transit and collapses the load — validate the pattern on your case and pallet.
- Throughput bottleneck. A palletizer that cannot pace the upstream line becomes the bottleneck — confirm sustained output with your line speed.
- Case damage from grippers. A robotic gripper that is mis-set crushes or drops cases — confirm gentle handling on your case.
- Pattern changeover. A new case size or SKU needs a new pattern and, on conventional machines, mechanical adjustment.
How to verify a palletizer
- Measured layer/case output: confirm layers or cases/hour on your case and pattern.
- Load-stability test: build a pallet and confirm it stays square and interlocked through handling.
- Gripper handling: confirm cases are placed without crush or drop marks.
- Pattern changeover: time a pallet-pattern change.
Frequently asked questions
Layer or robotic palletizing?
Layer palletizing is faster and suits high-volume, single-SKU lines; robotic palletizing is more flexible for mixed SKUs and limited floor space.
What decides pallet load stability?
The interlocking pattern, the interlayer (slip sheet or glue) and the case strength — validate the pattern on your actual case and pallet.
Can a robotic palletizer match a layer palletizer’s speed?
Generally not — robotic arms place one case at a time, so they trade speed for flexibility. Choose by volume and SKU mix.
Last verified: September 10, 2026.