A paperboard ring protector is an annulus of laminated board that sits on the face of a coil and covers the edge where the wrap ends. It is not a cushion and it is not a lid: its job is to take the contact that would otherwise land on the coil edge, and to hold that edge away from the pallet, the strap and the coil next to it.
Why a coil edge is the vulnerable part
A coil is wound under tension, so the outer wrap is the layer that carries the handling. The edge of that wrap is a thin, unsupported line of material, and it is the first thing to deform when a coil is set down, rolled or stacked.
Once that edge is deformed, the wrap can start to open. On a coated or painted coil the damage is visible at once; on a paper or film roll it shows as a crushed rim that cannot be rewound.
A ring covers the rim across a radial band, so the load is shared along the annulus instead of landing on the edge line.
Specification at a glance
A ring is specified by three dimensions and one material choice. Inner diameter follows the product, ring width follows how much face you want to cover, and board thickness follows handling. All three are made to the drawing rather than chosen from a stock list.
| Coil type | Ring inner diameter | Ring width | Note |
|---|
| Steel coil | To the coil OD, light push fit | Wider than the strap | Face stacking |
| Aluminium coil | To the coil OD | Covers the rim | Soft surface, clean board |
| Paper roll | To the roll OD | Covers the rim | Dry board only |
| Film roll | To the roll OD | Covers the rim | Avoid abrasion at the edge |
| Textile roll | To the roll OD | Wide band | Soft roll, low load |
How the ring is held in place
Some rings sit by fit alone: the inner diameter is a light push fit over the coil face, and friction plus the wrap hold it. Others are held by the strapping that passes over the coil, which is why the ring width should be at least as wide as the strap path.
Where the coil is wrapped in film after the ring is fitted, the film encloses both and the ring becomes part of the pack rather than a loose component.
Where rings are used and where they are not
Rings suit steel, aluminium and copper coils, paper and film rolls, and textile rolls, particularly where the coil is stacked on its face or stood on end. They are less useful where the coil is handled only by a mandrel and never touches a surface.
They are not a substitute for a proper coil cradle or for edge protection along the outer circumference. The ring protects the face edge; the body of the coil needs its own protection.
Questions buyers ask before ordering
What does a paperboard ring protector actually protect?
The coil face edge, where the outer wrap ends. It spreads contact along a radial band instead of a thin rim.
Is the ring a standard size?
No. Inner diameter, ring width and board thickness are made to the coil drawing.
How is it held on the coil?
By a light push fit, by the strapping that crosses it, or by the film wrap applied over both.
Can it be used on a coil that is never stacked?
It still protects the rim during loading and unloading, but the benefit is smaller than on a face-stacked coil.
Does it replace a coil cradle?
No. The ring protects the face edge; the cradle supports the coil body.
Send the product diameter, ring width and board thickness to mona@hengnicepacking.com and we will quote the ring that fits.
