The bottle neck finish controls how the cap starts, tightens, seals and opens. Capping machine selection should always consider thread style, neck diameter, liner contact and any tamper-evident feature.
The bottle neck finish controls how the cap starts, tightens, seals and opens. Capping machine selection should always consider thread style, neck diameter, liner contact and any tamper-evident feature.
Guide to bottle neck finish, thread engagement and closure compatibility for capping machines. UK advice on screw caps, ROPP and leak prevention.
Discuss this requirement →Poor cap placement or mismatched threads can cause cross-threading before torque is even applied.
The capper must help achieve seal compression without over-tightening, distorting the cap or damaging the bottle.
ROPP closures require a suitable glass finish and rolling head tooling. They are not simply tightened onto existing threads.
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.
It is the shape and dimensional specification of the bottle neck, including thread, sealing surface and tamper features.
Only if the cap and neck have been designed to work together. Similar-looking caps can behave differently.
It affects cap starting, torque, seal compression, tamper-band engagement and leak performance.
