That ring that snaps off the first time you open a bottle is a tamper-evident (TE) band — small, cheap and one of the most important parts of the pack for consumer trust. Here is how it works and what to specify.
What a tamper-evident band is
A TE band is a ring at the bottom of the closure, joined to the cap by thin bridges. On first opening the bridges break, so the band separates from the cap — giving visible, irreversible proof the pack was opened.
How it works
The band sits over a bead or ledge moulded on the bottle neck. When the cap is unscrewed the band catches on that bead and cannot rise, so turning the cap snaps the bridges. Re-closing the cap can never hide that the band has broken.
Common types
- Break-away band — the band drops onto the neck or stays as a loose ring (most beverage caps).
- Tear-band — a pull-tab the consumer tears off before opening.
- Ratchet / pilfer-proof — used on some screw closures and metal caps.
Tamper band vs tethered cap
A TE band shows first opening. A tethered cap (now mandated in the EU) additionally keeps the cap attached to the bottle after opening so it is not littered — a cap can have both. See tethered caps explained.
Getting the band to break cleanly
The band must break only on opening — never on the line and never not at all. That depends on bridge design, the neck bead, and the application torque: too high can pre-stress the bridges, too low leaves a loose seal. Validate it (see the 30-bottle torque method).
Where Delta fits
Delta El Nile for Industry supplies closures with tamper-evident bands across water, CSD, juice, dairy and oil formats. Choose your closure or build an RFQ.