How to prevent date coding errors
Control the message, product identity, print process and failure response so the right code reaches the right pack throughout the production run.
Wrong, missing and unreadable codes need different controls
A coding process can fail even when the printer is operating. The wrong message may be selected, the product may be misidentified, the print can be missing, the code can be unreadable or a failed pack can remain on the line. Error-proofing should address each failure and the way it is detected and contained.
| Failure | Primary prevention | Detection or containment |
|---|---|---|
| Wrong job or date | Controlled master data, product-linked job selection and restricted editing. | Independent first-off approval and content inspection. |
| Correct code on wrong product | Product identification and line clearance tied to the production order. | Product or artwork check before release and during changeover. |
| Missing print | Reliable trigger, printer-ready interlock and product tracking. | Presence inspection with stop or confirmed reject. |
| Unreadable print | Approved ink, print gap, speed, maintenance and product guidance. | Vision or code reading plus routine sample checks. |
| Failed pack not removed | Correct reject timing and physical separation. | Reject confirmation, bin-full detection and fail-safe line stop. |
Prevent manual entry where approved data already exists
Master data
Maintain approved product, message, shelf-life rule, barcode data and print location in a controlled source with named ownership.
Automatic selection
Use a product code, recipe, scanner or production order to call the correct message where the project risk justifies it.
Permission and audit
Restrict message editing, date overrides and template changes, and retain an audit record where required by the quality system.
Automation does not remove the need for approval
Automatic data can still be wrong because of mapping, master-data or timing errors. Check the first product against the production order and challenge the response to missing, duplicate or out-of-range data.
Use line clearance, first-off approval and restart checks
Clear the line
Remove previous products, packaging, labels and retained work before selecting the next coding job.
Select and verify
Confirm product, message, date rule, batch and print location before enabling production.
Approve first-off
Use a named check against the production order, not memory or a screen preview alone.
Monitor the run
Inspect at a defined frequency or online according to risk, and record failures and corrective action.
Control interruption
After cleaning, consumable change, jam, power loss or network fault, repeat the required code and product checks.
Close the batch
Reconcile rejected or held product, save required records and prevent the old job carrying into the next run.
Tests to include at FAT, SAT and periodic review
- Request an unknown product or message and confirm production cannot start.
- Enter an invalid date, duplicate serial or missing required field and prove the defined response.
- Block the product sensor or remove the encoder signal and confirm uncontrolled printing does not continue.
- Present no print, wrong print, damaged print and misplaced print to the inspection system.
- Prevent the reject device from operating or fill the reject bin and prove the fail-safe response.
- Restart after power and network loss and confirm the correct job, date and product status.
Share the current changeover, inspection and reject process with the coding enquiry.
Review coding error controls