Why Corrugated Boxes Get Crushed: 7 Common Causes
Crushed cartons are rarely a mystery once you separate the specification from the handling. Here are seven causes and the fix for each.
A crushed box on arrival almost always has a single traceable cause, even though it looks like general wear and tear. Before you change your supplier or your board grade, walk through the checks below — most crushing problems trace back to one of these seven factors, and most are fixable without redesigning the carton.
Treat this as a diagnostic sequence rather than a list to skim. Match what you are seeing in the warehouse to the symptom column first, then confirm the cause before you spend money on a heavier board.
Match the symptom to the cause
| Symptom | Likely cause | Fix |
|---|---|---|
| Top and bottom flaps bowed inward | Under-specified board for the stack load | Recalculate edge crush test requirement against actual stack height and weight |
| Bottom cartons of a pallet crushed, top ones fine | Stacking too high or held too long in storage | Set a maximum stack height and rotate stock on a FIFO basis |
| Corner and side panel damage on pallet edges | Pallet overhang beyond the deck boards | Match carton footprint to pallet size, or use edge boards |
| Boxes soften and sag without visible impact | Humidity absorption in storage or transit | Use moisture-resistant liners and control warehouse humidity |
| Panels bulge or dent inward around the product | Poor fit with excess void space inside the box | Size the box to the product and add void fill where needed |
| Cartons at the base of mixed pallets crushed unevenly | Mixed carton sizes stacked without column alignment | Stack same-size cartons in columns; avoid bridging loads |
| Localised gouges, torn flaps, clamp marks | Rough handling or clamp truck pressure | Retrain handling staff and specify clamp-safe board where forklifts use clamps |
Specification is the starting point, not the finish line
A box specified correctly for edge crush and bursting strength can still fail if it spends three weeks in a monsoon-damp godown or is stacked eight pallets high in a warehouse designed for four. Strength figures on a test certificate assume dry, controlled conditions and a defined stacking pattern — change either and the safety margin disappears quickly.
Where to start if you cannot identify the cause
- Photograph the damage pattern before repacking or discarding stock
- Check the stack height and duration in your own warehouse first
- Ask your supplier for the box's edge crush test and bursting strength values
- Measure ambient humidity where cartons are stored
- Review pallet size against carton footprint
In-house testing catches this before dispatch
We run edge crush, bursting strength and compression checks in-house before cartons leave our Chennai plant, so specification errors are caught before they reach your warehouse.
Not sure which cause applies to you?
Send us photographs of the damage and your current specification. We will tell you plainly whether it is a board issue or a handling issue.
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