A ring in a stack is a compression member, but not in the way a carton is. The load enters at the rim contact, travels through the band to the inner cut, and then into the coil face. A ring that is going to be described as high compression has to be thicker in build, bonded through the band, and matched to a band width that keeps the load path short.
The load path inside a ring
Stack weight arrives as a ring-shaped contact at the rim. It spreads across the band, and the inner cut is where the board is most highly stressed because the lever arm is longest there.
That is why a ring fails at the inner edge and not in the middle of the band. Any specification discussion should start there.
Specification at a glance
The table shows the choices that increase compression performance, in the order that gives the most benefit per millimetre of board.
| Change | Effect | Cost |
|---|
| Thicker board | Most direct gain | Board per ring |
| Wider band | Longer lever at the inner cut | Board, and outline |
| Narrower band | Shorter load path | Less coverage |
| Better bond | Delamination delayed | Grade selection |
| Deck protection added | Load shared | Extra component |
What we will not claim
There is no single compression figure for a paper ring that means anything without the test method, the specimen and the conditioning. We do not publish a headline number, and a supplier who does should be asked how it was measured.
The practical route is a trial on the actual stack: same ring, same coil, same stacking pattern, inspected after handling.
Compression and the rest of the pack
A ring cannot compensate for a pallet that is not rated for the load or for a stack that is too tall for its footprint. Compression performance of one component is always relative to the whole pack.
Where the stack is high, the ring and the pallet deck protection should be specified together, because both are in the load path.
Questions buyers ask before ordering
Do you publish a compression rating?
No. A figure without method, specimen and conditioning is not comparable.
How do I verify a ring for a stack?
Trial it on the actual stack and inspect after handling.
Does a wider band always help?
Not always. A wide band in thin board folds in the middle.
Where does a ring fail first?
At the inner cut, where the plies are exposed and the lever is longest.
Can a ring make up for a weak pallet?
No. It is one component of the load path.
Share the drawing or a product sample with mona@hengnicepacking.com and we will confirm feasibility before quoting.
