Spindle capping machines
Compare the main automatic, compact and semi-automatic capping routes.
Cap-height evidence
How do you control cap height on screw-capped bottles?
Cap height is a visible indicator of thread engagement and closure position.
Direct answer
How do you control cap height on screw-capped bottles?
Cap height is controlled by using compatible bottle and cap samples, setting cap presentation squarely, supporting the bottle during tightening and checking the finished position against approved packs. A cap-height check should be used with torque or integrity evidence rather than as the only acceptance test.
What cap-height variation can indicate
| Observation | Possible cause | Next check |
|---|---|---|
| One side higher | Tilted cap, cross-thread or poor handover. | Slow-speed view of cap start and neck finish. |
| All caps high | Insufficient thread engagement or stopping before final position. | Approved hand-capped reference and setting record. |
| Caps low or damaged | Excessive force, incompatible closure or wrong contact area. | Cap condition, liner contact and torque evidence. |
Related guidance
Continue the specification
FAT checklist
Plan evidence for sample testing, acceptance and handover.
Ask Lancing to review the pack
Send bottle, cap, samples, target output and any known fault evidence.