Cap start variation
The cap may sit at an angle before tightening begins.
Closure checks
Cap thread and liner checks before choosing a capper
Cap design can decide whether a screw capping machine runs smoothly or creates rejects.
Buyer intent
Small closure details can change cap start, final torque and cap feed performance.
Thread profile, cap height, liner compression, tamper band behaviour and material stiffness all affect the capping route. Two caps with the same diameter can still behave differently on the same machine.
Before choosing a capper, confirm whether the closure family is consistent and whether the cap can be oriented, fed and started reliably at the required speed.
Best-fit checks
- Compare caps from each supplier or batch.
- Check whether liners compress or drag during tightening.
- Confirm the neck finish and cap thread match.
- Identify tamper bands or features that affect feed orientation.
Specification checks
Closure details to confirm
These checks reduce the risk of cap start and torque problems.
| Question | Why it matters | What to send |
|---|---|---|
| Thread style | Thread shape affects how the cap starts and tightens. | Cap drawing, neck finish and samples. |
| Liner type | Liners can change tightening feel and final compression. | Cap liner details and quality requirements. |
| Cap height | Tall caps may need different grip or head settings. | Cap height and diameter. |
| Tamper band | Bands can interfere with feed or tightening if not controlled. | Finished pack samples and cap drawings. |
Decision points
Typical closure issues
Torque drift
Liners and thread quality can cause torque values to vary.
Feed orientation
Some caps are harder to orient in bowls or chutes than standard closures.
Related pages
Move to the right capping route
FAQ
Capping machine questions
Can different cap suppliers affect capping performance?
Yes. Small differences in material, liner or thread can change torque and feed behaviour.
Do liners matter for screw capping?
Yes. Liner compression can affect applied torque and the final seal.
Can a capper handle tamper-evident caps?
Often, but the tamper band and cap start should be checked with samples.
What is the quickest check before a quote?
Send actual cap and bottle samples rather than relying only on nominal dimensions.
Ready to shortlist?
Send the bottle, cap and target output.
Lancing UK will help identify the most practical capping route and quote the right machinery scope.