Cap-feed recovery
How should a cap-feed jam be recovered?
A cap-feed jam should be recovered through a defined safe-stop and restart procedure: stop the affected process, make intervention safe under the site risk assessment, preserve the fault evidence, clear the root cause, identify affected caps and bottles, reset the feeder and capper in the correct sequence, then inspect first-off packs before returning to normal production.
Safe recovery starting point
Make the intervention safe and preserve the fault evidence
Use the sequence below to define safe intervention, preserve the fault evidence, control bottles already in process and verify the first restarted packs. The machine documentation and site risk assessment take precedence over general guidance.
A cleared obstruction is not proof that the feed path is ready to run. Keep the cap orientation, jam location and affected bottles identifiable, then verify the feeder-to-chute handover and inspect first-off packs before normal production resumes.
Make the intervention safe before clearing the blockage
Jam clearance can expose moving belts, bowls, elevators, pneumatic devices or stored energy. The required isolation and access method must be established by the machine documentation and the user’s site-specific risk assessment. The UK Health and Safety Executive advises that maintenance and intervention should be planned, carried out by competent people and made safe before work starts; its work-equipment maintenance guidance explains the general principles.
Do not build the operating procedure around reaching into moving equipment or relying on an unverified interlock. If frequent jams require repeated access, investigate the cap, feed path and control sequence rather than normalising unsafe intervention.
Preserve the evidence before the cap is removed
- Photograph the closure orientation and exact jam location where this can be done safely.
- Record cap batch, hopper level, chute level, line speed and recent replenishment.
- Note sensor states, alarms and whether bottles were already beneath the placement point.
- Segregate damaged, doubled, inverted or contaminated caps and affected bottles.
- Record the action taken so recurring faults can be compared.
Use a defined restart sequence
| Restart stage | Question to answer | Evidence of control |
|---|---|---|
| Feeder and chute | Is the obstruction removed and cap orientation stable? | Controlled cap flow without doubles, inversion or repeated bridging |
| Bottles in process | Which bottles missed a cap or received a partly placed cap? | Held, removed or rejected packs are accounted for |
| Capper state | Are belts, wheels, sensors and recipe settings in the correct state? | Reset checklist and no unintended second tightening |
| First-off inspection | Do the first restarted packs meet the accepted standard? | Cap presence, height, thread, torque/integrity and visual checks |
| Return to output | Does the line remain stable after the initial restart? | Observed run with cause-coded fault record closed |
Test recovery during FAT and handover
Deliberately test realistic low-cap, chute-empty and controlled-stop scenarios during the factory acceptance test where safe and agreed. The purpose is not to create a damaging jam, but to confirm detection, bottle disposition, operator information and restart behaviour. Include the result in operator training and the format record.
Related guidance
Continue the investigation or specification
Cap feeding systems
Compare bowls, elevators, chutes and their handover to the capper.
Capping machine risk assessment
Plan operation, intervention, isolation and restart around the actual line.
Capping-machine FAT checklist
Include cap starvation, controlled stops and first-off inspection in acceptance.
Discuss recurring cap-feed faults
Send fault photographs, cap batches and the recorded line state.