Carton stacking strength is a specification that most packing operations do not think about until a pallet collapses. The cartons are stacked in the warehouse, the stack sits for days or weeks, and the cartons at the bottom carry the weight of everything above them. If the cartons are not strong enough, the stack fails.
The carton's own board grade determines most of its stacking strength. But the way the carton is filled determines how much of that strength is actually available. A carton that is filled with loose product and minimal cushioning has less stacking strength than a carton that is filled with product and a structural cushioning material.
How Void Space Weakens a Carton
A carton is strongest when its walls are supported. The vertical panels resist compression when they are straight and when the load is distributed evenly across the top edge. When the carton contains void space, the top edge is not fully supported, and the carton walls can bow outward under load.
The bowing reduces the carton's effective stacking strength. The carton may still hold the product, but it cannot carry the weight of the cartons above it. The stack either has to be shorter or the cartons have to be stronger, and both options cost money.
How Honeycomb Paper Fills the Void
A honeycomb paper machine produces a 3D honeycomb structure that fills the void space and contacts the carton walls. The material is firm enough to support the walls but not rigid enough to damage the product. The structure distributes the load across the carton's interior, which keeps the walls straight and preserves the stacking strength.
The operator shapes the material to match the carton's internal dimensions. Die-cutting width is adjustable between 200 and 500mm, so the output matches the carton size. The material fills the gaps around the product, which means the product does not shift and the walls are supported.
Why the Effect Matters for Pallet Building
The effect matters most during pallet building. A pallet is a stack of cartons, and the cartons at the bottom carry the weight of the entire stack. If the cartons are weak, the pallet has to be built shorter, which means more pallets for the same shipment.
A carton that is properly filled with honeycomb paper carries more weight, which means the pallet can be built higher. The higher pallet uses fewer pallet positions, which reduces the shipping cost per unit.
How to Measure the Effect
The practical way to measure the effect is to compare the pallet height before and after the switch to honeycomb paper. If the pallet can be built higher with the same cartons, the cushioning is contributing to the stacking strength.
A die that lasts about 1.0~1.3 million meters keeps the cells uniform across the entire run. The uniform cells mean the support is consistent across every carton in the pallet, which is what allows the pallet to be built predictably.
What the Machine Delivers
A honeycomb paper machine that fills void space delivers cartons with improved stacking strength. Die-cutting speed is adjustable between 5 and 18 m/min, and die-cutting width is adjustable between 200 and 500mm. Suitable paper is ≤80gsm, and both virgin kraft paper and recycled paper work.
Power requirements are modest: 1.5kW total power at AC220V/50HZ, with no compressor, heating element, or adhesive system. A compact footprint of just over 1 cubic meter, dimensions around 950x1150x1260mm and net weight near 502kg, means the machine can sit at the packing bench. A paper roll length of about 1700m, with a maximum unwind diameter of 500mm and a paper core inner diameter of 75mm, supports a long production run before the roll needs to be changed.
The output is biodegradable packaging and degradable packing material, a practical alternative to plastic packing materials, and it supports reuse cartons and paper recycling. Better stacking strength is what makes that output useful in the warehouse, not just at the packing bench.