Layer Rotation
Layer rotation is a standard logistics technique for improving pallet stability. By rotating every Nth layer 90 degrees, items in adjacent layers cross over each other's seams, creating a mechanical interlock that prevents the stack from shifting sideways during transport.
How It Works
After building the pallet, LOP attempts 90-degree turns about the vertical axis through the stack's own centre.
A turn is kept only if the layer stays on the deck and adds no collision, bounds, support, orientation, top-load, crush or fragile-item breach; otherwise it stays as built.
Layers containing Vertical Only cuboids, STEP parts or cylinders stay as built.
With Every 2 layers, accepted turns look like this:
- Layer 1 — original orientation (0 degrees)
- Layer 2 — rotated 90 degrees (if rotating every 2 layers)
- Layer 3 — original orientation
- Layer 4 — rotated 90 degrees
- And so on...
Side view (every 2 layers):
Layer 4: ║ ═══╦═══╦═══ ║ ← rotated 90°
Layer 3: ║═══╦═══╦═══╦═║ ← original
Layer 2: ║ ═══╦═══╦═══ ║ ← rotated 90°
Layer 1: ║═══╦═══╦═══╦═║ ← original
╚═══╧═══╧═══╧═╝
palletThe items in rotated layers bridge the vertical seams of the layer below, similar to how bricks in a wall overlap to create a strong bond.
Rotation Settings
Layer rotation is configured in the Palletize Panel:
| Setting | Behavior |
|---|---|
| Off | No additional layer turns. Default. |
| Every 2 layers | Attempts 90-degree turns of layers 2, 4, 6, 8... |
| Every 3 layers | Attempts 90-degree turns of layers 2, 5, 8, 11... |
When to Use Layer Rotation
Layer rotation is most effective when:
- Items are uniform — all items in the pallet are the same size, so rotated layers produce the same footprint
- The pallet travels a long distance — more vibration and handling means more risk of shifting
- You are using Column pattern — Column alone has no interlocking, so layer rotation adds the cross-layer bond
Combining Column pattern + rotation every 2 layers is one of the most common pallet configurations in warehouse logistics. It gives you maximum density from Column with cross-layer stability from rotation.
When Not to Use Layer Rotation
Layer rotation may not be ideal when:
- Items are rectangular and fill the pallet exactly in one orientation — rotating 90 degrees may leave gaps if the pallet is not square
- Items are square — rotating a square 90 degrees produces the identical arrangement, so rotation has no effect
- Items vary significantly in size — mixed-size layers do not interlock cleanly when rotated
Layer rotation keeps the same items; it does not repack the layer to make a turn fit. A turn that fails the checks leaves that layer unchanged.
Combining with Packing Patterns
Layer rotation works with any packing pattern, but some combinations are more effective:
| Pattern + Rotation | Stability | Notes |
|---|---|---|
| Column + every 2 layers | Good | The classic warehouse configuration |
| Interlock + every 2 layers | Very good | Double interlocking (within layer + between layers) |
| Pinwheel + every 2 layers | Excellent | Maximum interlock in all directions |
| Best Fit + every 2 layers | Varies | Depends on item mix |
Next Steps
- Packing Patterns — choose the right pattern to pair with rotation
- Pallet Containment — what your pallets hold unwrapped, and the test that would show the rest
- Manual Palletization — configure rotation when building pallets