What must change when a SKU changes?
A SKU change can affect the authorised message, date or batch rule, artwork, pack material, code position, printhead or sensor adjustment, ink or ribbon, inspection recipe and reject or hold logic. The changeover record should identify which of these items change for each format rather than assuming only the text is different.
Use a job-specific checklist that combines data and physical setup. A correct message on the wrong substrate or at the wrong position is still a failed changeover.
How can an old message be prevented from remaining active?
Close or deselect the previous job, use controlled job names or recipe mapping, restrict free selection, and require the operator to confirm the active SKU and visible variable fields before product release. Where possible, the packaging-machine recipe or scanned job instruction should call the approved printer job rather than relying on memory.
Challenge a deliberately wrong or stale job during acceptance to confirm that the control and release process detects it.
Should operators type variable coding data manually?
Manual entry may be suitable for a controlled low-complexity process, but it increases the need for clear prompts, range checks, independent verification and access control. Data that already exists in an authorised production system should not be retyped without a justified reason.
Decide field by field whether it is calculated, transferred, scanned, selected or entered. The data-ownership guide helps assign those routes.
How are printhead position and substrate changes controlled?
Use repeatable adjustment references, approved format settings and a clear record of the material and consumable combination. If the substrate supplier, coating, colour, treated side or container geometry changes, confirm whether the existing print approval still applies before releasing production.
A changeover should include print gap, angle, sensor delay, guide position and the final-pack code location where those factors can vary.
What should first-off approval include?
First-off approval should confirm the correct SKU, message version, variable values, date or batch rule, code position, legibility, adhesion and any barcode or inspection requirement on the finished pack. The approver should be able to trace the sample to the production instruction and current machine job.
Retain the result or a record of it according to the site quality process. A visual glance at the printer display does not replace checking the physical pack.
How should rework and restart product be handled?
Rework and restart product should follow a defined identification and coding route so an old code is not overwritten ambiguously or a pack bypasses the normal print and inspection sequence. Decide whether the product is recoded, relabelled, held for manual verification or excluded from the line.
Challenge the recovery sequence during commissioning, including product already between trigger, printer, inspection and reject points when the line stops.
