Direct answer
Detecting a defect is not the end of the control. The system must track the failed pack to the reject point, remove it under the full speed and spacing range, confirm rejection and respond safely if air, bin capacity, timing or confirmation fails.
Practical objective: a tested reject sequence in which every known failed pack is removed, contained and accounted for.
Questions and phrases customers use
This guide also answers searches such as:
- reject verification packaging line
- fail safe reject system
- checkweigher reject confirmation
- inspection reject validation
Information to collect first
Use one controlled set of figures and representative production conditions. Record the source and date of each assumption so quotations and improvement options can be compared on the same basis.
- Measure distance and transport time from inspection to reject
- Define product tracking through stops, gaps and speed changes
- Record minimum and maximum pack size and mass
- Specify reject method, direction and recovery risk
- Add reject confirmation, bin-full and bin-presence monitoring where required
- Define stop, alarm and restart rules after a reject fault
How to make the decision
Work from the required finished result back through the process. Keep compliance, product quality, sustained output and total ownership cost visible together.
- Challenge single and consecutive failed packs at minimum and maximum speed
- Test faults such as low air, missing bin and blocked reject path
- Use lockable or controlled reject collection where mix-up matters
- Reconcile inspected, accepted and rejected counts
- Prevent untested packs passing during startup, shutdown or recovery
Common mistakes to avoid
- Confirming only that the reject actuator fired
- Letting packs overtake between inspection and reject
- Using a reject bin that can overflow back into the line
- Restarting after a fault without accounting for packs in the controlled zone
Customer decision table
| Failure mode | Required question |
|---|---|
| Low air pressure | Does the line stop before an unremoved reject can pass? |
| Reject bin absent or full | Is the condition detected and production inhibited? |
| Consecutive rejects | Can the mechanism remove them at full rate? |
| Conveyor stop between points | Is product identity retained through restart? |
Questions customers also ask
Is a reject sensor enough?
Should rejected packs be locked away?
How often should the reject be challenged?
What records should be retained?
Evidence to retain
Keep the controlled requirement, product and packaging samples, measurements, trial results, supplier scope and acceptance records used for the decision.
Download the planning template
Use the CSV worksheet to allocate evidence, owners, actions and dates before requesting quotations or approving a change.
Related guides and calculators
Need help applying this to your line?
Send the product, pack, current method, measured problem and required result. The more specific the evidence, the more useful the machinery review can be.