Controls and recovery

What should a cap feeder do when the capping line stops?

A cap feeder should respond to capper demand or a full-queue condition before the chute is overfilled, then preserve a stable cap supply for controlled restart. The exact sequence depends on the feeder, cap, chute, capper and site control architecture.

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Direct answer

Stop the upstream supply before a healthy queue becomes an overload.

When the capper pauses, caps already in the final track may remain as a useful restart buffer. The feeder should reduce or stop the upstream stages at an agreed queue condition so caps are not forced into one another, circulated excessively or allowed to escape the guides.

The stop and restart sequence should distinguish normal demand loss, an empty hopper, a blocked chute, a capper fault and a safety stop. Sensor states and operator actions must be defined by the final machine control and risk assessment; a generic logic diagram cannot replace the installed design.

Operating states

Define normal demand, full queue, fault and restart separately.

State	Expected purpose	Information to agree
Normal demand	Maintain enough correctly presented caps without continuously flooding the final track.	Demand signal, operating band and permitted queue.
Full queue or capper pause	Stop or modulate upstream feeding while protecting queued caps.	Sensor position, stop order and maximum stable accumulation.
Low cap or starvation	Warn the operator and prevent uncapped bottles where the line design requires it.	Warning point, response time and bottle/capper action.
Jam or abnormal condition	Stop the affected motion, identify the fault and allow safe recovery.	Detection method, fault ownership, access and reset permissions.
Restart	Re-establish a valid cap queue and coordinated bottle flow.	Checks, reset sequence and whether the feeder primes before the capper runs.

Recovery sequence

Test line behaviour around the stop, not only steady production.

Detect demand loss

Use the agreed capper or chute condition rather than waiting for mechanical overfill.

Stop in order

Reduce upstream supply while retaining only the queue the track can hold safely.

Confirm the cause

Separate a normal pause from low caps, a blocked chute, a capper fault or a safety event.

Restart deliberately

Check the transfer path, rebuild the required queue and release bottles in the tested sequence.

Buyer questions

Questions about full-chute and restart control.

Should the cap feeder stop as soon as the capper stops?

Not necessarily every feeder stage must stop at the same instant. The control may allow a short, stable final queue to fill before stopping upstream supply, or it may stop immediately when the cap or chute cannot tolerate further accumulation.

The intended behaviour should be defined from the track capacity, closure condition, capper stop pattern and control architecture, then tested during normal pauses and faults.

Relate stopping to buffer capacity

How is a full chute detected?

A suitable sensor can monitor cap presence or queue level at a position chosen to represent the usable final buffer. The sensing method depends on cap material, colour, geometry, spacing and the physical access around the track.

The sensor position must allow enough time for upstream stages to stop before the queue becomes unstable. The trial should check false detection, gaps between caps and restart as the queue falls.

Review cap-in-chute sensing

What prevents caps being damaged during a prolonged stop?

Upstream supply should stop before excessive queue pressure or recirculation develops, while sensitive caps remain within the stable part of the route. For a long stop, the operating instructions may require additional clearing or isolation depending on the cap and machine.

The acceptance test should inspect queued and recirculated caps after representative stops, especially when liners, tamper bands or decorated surfaces could be affected.

Check sensitive closure conditions

What should operators check before restarting?

Operators should confirm the cause is cleared, guards and access points are restored, the chute or pick point contains correctly presented caps, sensors show the expected state and the capper is ready to receive closures. The final sequence must follow the machine instructions and site safety system.

A documented first-off check can confirm cap presence and application after restart before the line returns to normal production.

Include restart in acceptance testing

Discuss capper and feeder controls Review PLC integration

Related guidance

Connect queue control, sensing and fault recovery.

Buffer sizingDefine the usable queue before setting stop points.Jam detectionDistinguish a healthy full queue from a blockage.Capper handoverDefine the transfer state before restart.Knowledge hubBrowse the complete question-led resource layer.