Roll-On Pilfer-Proof (ROPP) Caps

ROPP — roll-on pilfer-proof — caps arrive as plain, unthreaded aluminum shells. The thread is formed at the moment of capping: rollers in the capping head press the soft aluminum into the bottle’s thread, producing a closure that fits that individual bottle exactly. A second roller tucks the lower skirt under the locking ring on the neck to form the pilfer band.

That band is bridged to the cap and tears away on first opening, so tampering is obvious. The long 30 x 60 mm wine version, often called BVS or Stelvin-type, is the aluminum screw cap now widely used on still wine.

We supply ROPP caps for spirits and liqueurs, still wine, edible oils, pharmaceutical and nutraceutical liquids, syrups and tonics, and vinegars. They are the default choice for export bottling and for markets where buyers expect visible tamper evidence on every bottle. Distilleries value the clean metal finish and secure seal on high-alcohol products, while wineries use the BVS format as an alternative to cork for fresh, aromatic wines.

The shell is drawn from aluminum with the pilfer band and bridges formed in and the liner placed inside — PE or PV for general use, Saranex for wine, PTFE-faced for high-alcohol spirits and aggressive oils. Sizes run from 18 mm to 38 mm, plus the 30 x 60 mm wine format. Lithographed print, embossed tops and side knurling provide branding and grip, and long-skirt versions give spirit bottles a tall, finished neck.

ROPP caps need a roll-on capping head with thread and pilfer rollers set to the cap and finish. Poor roller settings cause leaks, loose caps or incompletely formed bands, so the head is set up for each format and checked regularly through the run, with top load and roller pressure adjusted for the liner. Tell us your capping machine and bottle finish and we’ll match shell dimensions and liner to them.

Shells are drawn from lithographed aluminum, the band and bridges are cut, and the liner is placed; the thread is deliberately left unformed. Shell dimensions, liner position and bridge strength are our key quality checks. We offer stock silver and gold, custom lacquer colors, printed tops and sides, embossing and knurl patterns, with caps bulk-bagged in cartons and labeled by size and liner.