Capping glossary
Capping machine glossary: common terms explained.
Plain-English glossary of capping machine terms including ROPP, chuck capper, spindle capper, torque, cap feeder, neck finish and change parts.
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Capping machine glossary: common terms explained.
Capping machinery uses specialist terms that can be confusing when comparing suppliers. This glossary explains the common words used when specifying bottle cappers and closure handling equipment.
Buying guide
Practical specification points for this capping route.
Capping machinery uses specialist terms that can be confusing when comparing suppliers. This glossary explains the common words used when specifying bottle cappers and closure handling equipment.
Useful details to confirm
- Use the glossary when comparing machine quotations
- Ask suppliers which terms apply to your closure
- Confirm all tooling and change parts in writing
- Send samples when terminology is unclear
Selection notes
What to check before selecting machinery.
ROPP
Roll-on pilfer-proof. An aluminium cap is formed onto a suitable bottle neck using rollers.
Chuck capper
A capping head uses a shaped chuck to grip and tighten a closure.
Spindle capper
Pairs of rotating discs or belts tighten a cap as the bottle travels through the machine.
Cap feeder
A system that sorts, orientates and delivers caps to the capping point.
Neck finish
The bottle neck shape and thread/sealing specification that the cap must match.
Change parts
Tooling or guides changed to run another bottle or cap format.
Next step
Send bottle, cap and output details before final machine selection.
Photos and dimensions can start the discussion. Physical bottle and cap samples are normally the best way to confirm tooling, cap feeding, bottle support and realistic output.
FAQ
Common questions
What does ROPP mean?
ROPP means roll-on pilfer-proof and refers to aluminium closures formed onto a bottle neck.
What is capping torque?
Capping torque is the rotational force applied to tighten a threaded cap.
What is a cap feeder?
A cap feeder sorts and delivers caps to the capping machine in the correct orientation.
Additional closure terms
Terms used in screw-cap comparison and fault finding.
| Term | Meaning in a capping project |
|---|---|
| Chuck insert | The shaped contact component inside a chuck that grips or engages a specific cap profile. |
| Spindle disc | A rotating side-contact wheel used in a spindle capper to apply progressive tightening action. |
| Tamper-evident band | A band or ring designed to provide visible evidence when a closure is first opened; its exact behaviour depends on the package design. |
| Bridge | A designed connection between the main closure and a breakaway tamper band that is intended to separate during first opening. |
| Thread stripping | Damage or deformation that prevents the cap or bottle thread from holding on the intended path. |
| Cap back-off | A reduction in closure tightness after application caused by package, process or storage behaviour. |
| Flip-top closure | A moulded dispensing closure with a hinged lid and, commonly, a threaded base applied to the bottle. |
| Disc-top closure | A dispensing closure with a pressable top that opens and closes an outlet while the base remains attached to the bottle. |