Tamper evidence gets specified late, usually after the bottle and the cap are settled. That order causes trouble, because two of the four systems ask something of your glass finish that a drawing has to carry from the start.
What Tamper Evidence Is For
A tamper feature does not stop interference. It removes deniability: once broken, it cannot be restored, so an opened pack cannot be passed off as a sealed one.
That distinction matters when you choose. Judge a system by how obvious the break is to a shopper holding your bottle, not by how hard it is to defeat in a laboratory.
The 4 Systems Compared
| System | How the break shows | What it asks of your bottle |
|---|---|---|
| Pilfer band | A ring of bridges snaps and the band drops loose on the neck. | A retaining bead on the finish for the band to catch under. |
| Shrink sleeve | The sleeve tears at a perforation and cannot be reseated. | Neck and shoulder geometry the sleeve can shrink onto evenly. |
| Induction foil | A sealed membrane across the finish, torn to open. | A flat sealing surface and a cap that carries the foil liner. |
| Vacuum button | A domed lid panel that pops up once the vacuum breaks. | A lug or twist-off finish and a hot fill or steam vacuum. |
Which One Your Market Expects
Category convention drives this more than regulation. Sauces and supplements sell on an induction seal, spirits on a capsule or band, juices on a band plus a button, and preserves on the audible pop of a lid.
Meeting the convention costs you nothing and reassures your buyer immediately. Departing from it invites the question your packaging exists to answer, which is why a 330 ml (11 oz) juice in an unbanded cap reads as unfinished on a shelf.
The vacuum button is a tamper feature and a seal check at once. SGSBOTTLE runs lug finishes on 14 lines.
Where It Touches Your Glass Drawing
Two systems reach back into the mould. A pilfer band needs a bead of the right height and profile on the finish, and getting that wrong leaves bands that spin free or refuse to seat.
A shrink sleeve needs a neck and shoulder that let the film pull down evenly, without a step that traps air. SGSBOTTLE engineers mark both features on the drawing before the mould is cut, so the closure and the sleeve are proven on one sample before the run starts on any of the 14 lines in Shandong and Xuzhou.
Combining Systems Without Doubling Cost
Two features usually beat one, and they rarely cost twice. An induction seal proves the product is untouched while a band proves the closure has not been swapped, and together they cover both stories.
Choose the pair by risk. A high-value 750 ml (25 oz) spirits bottle earns a capsule and a serialised label; a household product does not, and spending there buys you nothing your customer will notice.
What Goes on Your Enquiry
Your destination markets, the product category, the closure you plan to use, and the format in ml and oz. SGSBOTTLE comes back with the finish that carries the tamper system, the drawing showing the bead or sleeve geometry, and samples to test.